stig-pardus-17-en.txt

Kural_ID: SV-86479r2_rule
Onem: high
Kural_Basligi: The cryptographic hash of system files and commands must match vendor values.
Aciklama: Without cryptographic integrity protections, system command and files can be altered by unauthorized users without detection.\n\nCryptographic mechanisms used for protecting the integrity of information include, for example, signed hash functions using asymmetric cryptography enabling distribution of the public key to verify the hash information while maintaining the confidentiality of the key used to generate the hash.
Aranacak_icerik: Verify the cryptographic hash of system files and commands match the vendor values.\n\nCheck the cryptographic hash of system files and commands with the following command:\n\nNote: System configuration files (indicated by a "c" in the second column) are expected to change over time. Unusual modifications should be investigated through the system audit log.\n\n# dpkg -V | grep "^..5"\n\nIf there is any output from the command for system binaries, this is a finding.
Cozum: Run the following command to determine which package owns the file:\n\n# dpkg -S <filename>\n\nThe package can be reinstalled from a apt repository using the command:\n\n# apt-get install --reinstall <packagename>\n\nAlternatively, the package can be reinstalled from trusted media using the command:\n\n# dpkg -V <packagename>

Kural_ID: SV-86515r2_rule
Onem: medium
Kural_Basligi: The operating system must enable a user session lock until that user re-establishes access using established identification and authentication procedures.
Aciklama: A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not want to log out because of the temporary nature of the absence.\n\nThe session lock is implemented at the point where session activity can be determined.\n\nRegardless of where the session lock is determined and implemented, once invoked, the session lock must remain in place until the user reauthenticates. No other activity aside from reauthentication must unlock the system.\n\n
Aranacak_icerik: Verify the operating system enables a user\'s session lock until that user re-establishes access using established identification and authentication procedures. The screen program must be installed to lock sessions on the console.\n\nNote: If the system does not have GNOME installed, this requirement is Not Applicable.\n\nCheck to see if the screen lock is enabled with the following command:\n\n# gsettings get org.gnome.desktop.screensaver lock-enabled\ntrue\n\nIf the "lock-enabled" setting is missing or is not set to "true", this is a finding.
Cozum: [u'Configure the operating system to enable a user\'s session lock until that user re-establishes access using established identification and authentication procedures.\n\nCreate a database to contain the system-wide screensaver settings (if it does not already exist) with the following command:\n\n# touch /etc/dconf/db/local.d/00-screensaver\n\nEdit \u201corg/gnome/desktop/session\u201d and add or update the following lines:\n\n# Set the lock time out to 900 seconds before the session is considered idle\nidle-delay=uint32 900\n\nEdit "org/gnome/desktop/screensaver" and add or update the following lines:\n\n# Set this to true to lock the screen when the screensaver activates\nlock-enabled=true\n# Set the lock timeout to 180 seconds after the screensaver has been activated\nlock-delay=uint32 180\n\nYou must include the "uint32" along with the integer key values as shown.\n\nOverride the user\'s setting and prevent the user from changing it by editing \u201c/etc/dconf/db/local.d/locks/screensaver\u201d and adding or updating the following lines:\n\n# Lock desktop screensaver settings\n/org/gnome/desktop/session/idle-delay\n/org/gnome/desktop/screensaver/lock-enabled\n/org/gnome/desktop/screensaver/lock-delay\n\nUpdate the system databases:\n\n# dconf update\n\nUsers must log out and back in again before the system-wide settings take effect.wbctodo

Kural_ID: SV-86517r2_rule
Onem: medium
Kural_Basligi: The operating system must initiate a screensaver after a 15-minute period of inactivity for graphical user interfaces.
Aciklama: A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock.\n\nThe session lock is implemented at the point where session activity can be determined and/or controlled.
Aranacak_icerik: Verify the operating system initiates a screensaver after a 15-minute period of inactivity for graphical user interfaces. The screen program must be installed to lock sessions on the console.\n\nNote: If the system does not have GNOME installed, this requirement is Not Applicable.\n\nCheck to see if GNOME is configured to display a screensaver after a 15 minute delay with the following command:\n\n# grep -i idle-delay /etc/dconf/db/local.d/*\nidle-delay=uint32 900\n\nIf the "idle-delay" setting is missing or is not set to "900" or less, this is a finding.
Cozum: [u'Configure the operating system to initiate a screensaver after a 15-minute period of inactivity for graphical user interfaces.\n\nCreate a database to contain the system-wide screensaver settings (if it does not already exist) with the following command:\n\n# touch /etc/dconf/db/local.d/00-screensaver\n\nEdit \u201corg/gnome/desktop/session\u201d and add or update the following lines:\n\n# Set the lock time out to 900 seconds before the session is considered idle\nidle-delay=uint32 900\n\nEdit "org/gnome/desktop/screensaver" and add or update the following lines:\n\n# Set this to true to lock the screen when the screensaver activates\nlock-enabled=true\n# Set the lock timeout to 180 seconds after the screensaver has been activated\nlock-delay=uint32 180\n\nYou must include the "uint32" along with the integer key values as shown.\n\nOverride the user\'s setting and prevent the user from changing it by editing \u201c/etc/dconf/db/local.d/locks/screensaver\u201d and adding or updating the following lines:\n\n# Lock desktop screensaver settings\n/org/gnome/desktop/session/idle-delay\n/org/gnome/desktop/screensaver/lock-enabled\n/org/gnome/desktop/screensaver/lock-delay\n\nUpdate the system databases:\n\n# dconf update\n\nUsers must log out and back in again before the system-wide settings take effect.wbctodo

Kural_ID: SV-86527r2_rule
Onem: medium
Kural_Basligi: When passwords are changed or new passwords are established, the new password must contain at least one upper-case character.
Aciklama: Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks.\n\nPassword complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.
Aranacak_icerik: Note: The value to require a number of upper-case characters to be set is expressed as a negative number in "/etc/pam.d/common-password".\n\nCheck the value for "ucredit" in "/etc/pam.d/common-password" with the following command:\n\n# grep ucredit /etc/pam.d/common-password\npassword	requisite  pam_pwquality.so retry=3 ucredit=-1\n\nIf the value of "ucredit" is not set to a negative value, this is a finding.
Cozum: Configure the operating system to enforce password complexity by requiring that at least one upper-case character be used by setting the "ucredit" option.\n\nAdd the following line to "/etc/pam.d/common-password" (or modify the line to have the required value):\n\npassword    requisite  pam_pwquality.so retry=3 ucredit=-1

Kural_ID: SV-86529r2_rule
Onem: medium
Kural_Basligi: When passwords are changed or new passwords are established, the new password must contain at least one lower-case character.
Aciklama: Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks.\n\nPassword complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.
Aranacak_icerik: Note: The value to require a number of lower-case characters to be set is expressed as a negative number in "/etc/pam.d/common-password".\n\nCheck the value for "lcredit" in "/etc/pam.d/common-password" with the following command:\n\n# grep lcredit /etc/pam.d/common-password \npassword    requisite  pam_pwquality.so retry=3 ucredit=-1 lcredit=-1\n\nIf the value of "lcredit" is not set to a negative value, this is a finding.
Cozum: Configure the operating system to enforce password complexity by requiring that at least one upper-case character be used by setting the "ucredit" option.\n\nAdd the following line to "/etc/pam.d/common-password" (or modify the line to have the required value):\n\npassword    requisite  pam_pwquality.so retry=3 ucredit=-1 lcredit=-1

Kural_ID: SV-86531r2_rule
Onem: medium
Kural_Basligi: When passwords are changed or new passwords are assigned, the new password must contain at least one numeric character.
Aciklama: Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks.\n\nPassword complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.
Aranacak_icerik: Note: The value to require a number of numeric characters to be set is expressed as a negative number in "/etc/pam.d/common-password".\n\nCheck the value for "dcredit" in "/etc/pam.d/common-password" with the following command:\n\n# grep dcredit /etc/pam.d/common-password \npassword    requisite  pam_pwquality.so retry=3 ucredit=-1 lcredit=-1 dcredit=-1\n\nIf the value of "dcredit" is not set to a negative value, this is a finding.
Cozum: Configure the operating system to enforce password complexity by requiring that at least one numeric character be used by setting the "dcredit" option.\n\nAdd the following line to /etc/pam.d/common-password (or modify the line to have the required value):\n\npassword    requisite  pam_pwquality.so retry=3 ucredit=-1 lcredit=-1 dcredit=-1

Kural_ID: SV-86533r1_rule
Onem: medium
Kural_Basligi: When passwords are changed or new passwords are assigned, the new password must contain at least one special character.
Aciklama: Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks.\n\nPassword complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.
Aranacak_icerik: Verify the operating system enforces password complexity by requiring that at least one special character be used.\n\nNote: The value to require a number of special characters to be set is expressed as a negative number in "/etc/pam.d/common-password".\n\nCheck the value for "ocredit" in "/etc/pam.d/common-password" with the following command:\n\n# grep ocredit /etc/pam.d/common-password \npassword    requisite  pam_pwquality.so retry=3 ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1\n\nIf the value of "ocredit" is not set to a negative value, this is a finding.
Cozum: Configure the operating system to enforce password complexity by requiring that at least one special character be used by setting the "dcredit" option.\n\nAdd the following line to "/etc/pam.d/common-password" (or modify the line to have the required value):\n\npassword    requisite  pam_pwquality.so retry=3 ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1

Kural_ID: SV-86535r1_rule
Onem: medium
Kural_Basligi: When passwords are changed a minimum of eight of the total number of characters must be changed.
Aciklama: Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks.\n\nPassword complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.
Aranacak_icerik: The "difok" option sets the number of characters in a password that must not be present in the old password.\n\nCheck for the value of the "difok" option in "/etc/pam.d/common-password" with the following command:\n\n# grep difok /etc/pam.d/common-password \npassword    requisite  pam_pwquality.so retry=3 ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1 difok=8\n\nIf the value of "difok" is set to less than "8", this is a finding.
Cozum: Configure the operating system to require the change of at least eight of the total number of characters when passwords are changed by setting the "difok" option.\n\nAdd the following line to "/etc/pam.d/common-password" (or modify the line to have the required value):\n\npassword    requisite  pam_pwquality.so retry=3 ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1 difok=8

Kural_ID: SV-86537r1_rule
Onem: medium
Kural_Basligi: When passwords are changed a minimum of four character classes must be changed.
Aciklama: Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks.\n\nPassword complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.
Aranacak_icerik: The "minclass" option sets the minimum number of required classes of characters for the new password (digits, upper-case, lower-case, others).\n\nCheck for the value of the "minclass" option in "/etc/pam.d/common-password" with the following command:\n\n# grep minclass /etc/pam.d/common-password \npassword    requisite  pam_pwquality.so retry=3 ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1 difok=8 minclass=4\n\nIf the value of "minclass" is set to less than "4", this is a finding.
Cozum: Configure the operating system to require the change of at least four character classes when passwords are changed by setting the "minclass" option.\n\nAdd the following line to "/etc/pam.d/common-password" (or modify the line to have the required value):\n\npassword    requisite  pam_pwquality.so retry=3 ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1 difok=8 minclass=4

Kural_ID: SV-86539r1_rule
Onem: medium
Kural_Basligi: When passwords are changed the number of repeating consecutive characters must not be more than four characters.
Aciklama: Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks.\n\nPassword complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.
Aranacak_icerik: The "maxrepeat" option sets the maximum number of allowed same consecutive characters in a new password.\n\nCheck for the value of the "maxrepeat" option in "/etc/pam.d/common-password" with the following command:\n\n# grep maxrepeat /etc/pam.d/common-password \npassword    requisite  pam_pwquality.so retry=3 ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1 difok=8 minclass=4 maxrepeat=2\n\nIf the value of "maxrepeat" is set to more than "2", this is a finding.
Cozum: Configure the operating system to require the change of the number of repeating consecutive characters when passwords are changed by setting the "maxrepeat" option.\n\nAdd the following line to "/etc/pam.d/common-password conf" (or modify the line to have the required value):\n\npassword    requisite  pam_pwquality.so retry=3 ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1 difok=8 minclass=4 maxrepeat=2

Kural_ID: SV-86541r1_rule
Onem: medium
Kural_Basligi: When passwords are changed the number of repeating characters of the same character class must not be more than four characters.
Aciklama: Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks.\n\nPassword complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.
Aranacak_icerik: The "maxclassrepeat" option sets the maximum number of allowed same consecutive characters in the same class in the new password.\n\nCheck for the value of the "maxclassrepeat" option in "/etc/pam.d/common-password" with the following command:\n\n# grep maxclassrepeat /etc/pam.d/common-password \npassword    requisite  pam_pwquality.so retry=3 ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1 difok=8 minclass=4 maxrepeat=2 maxclassrepeat=4\n\nIf the value of "maxclassrepeat" is set to more than "4", this is a finding.
Cozum: Configure the operating system to require the change of the number of repeating characters of the same character class when passwords are changed by setting the "maxclassrepeat" option.\n\nAdd the following line to "/etc/pam.d/common-password" conf (or modify the line to have the required value):\n\npassword    requisite  pam_pwquality.so retry=3 ucredit=-1 lcredit=-1 dcredit=-1 ocredit=-1 difok=8 minclass=4 maxrepeat=2 maxclassrepeat=4

Kural_ID: SV-86543r1_rule
Onem: medium
Kural_Basligi: The PAM system service must be configured to store only encrypted representations of passwords.
Aciklama: Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are not encrypted, they can be plainly read (i.e., clear text) and easily compromised. Passwords encrypted with a weak algorithm are no more protected than if they are kept in plain text.
Aranacak_icerik: Verify the PAM system service is configured to store only encrypted representations of passwords. The strength of encryption that must be used to hash passwords for all accounts is SHA512.\n\nCheck that the system is configured to create SHA512 hashed passwords with the following command:\n\n# grep sha512 /etc/pam.d/common-password\npassword sufficient pam_unix.so sha512\n\nIf the "/etc/pam.d/common-password" configuration files allow for password hashes other than SHA512 to be used, this is a finding.
Cozum: Configure the operating system to store only SHA512 encrypted representations of passwords.\n\nAdd the following line in "/etc/pam.d/common-password":\n\npassword sufficient pam_unix.so sha512

Kural_ID: SV-86545r1_rule
Onem: medium
Kural_Basligi: The shadow file must be configured to store only encrypted representations of passwords.
Aciklama: Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are not encrypted, they can be plainly read (i.e., clear text) and easily compromised. Passwords encrypted with a weak algorithm are no more protected than if they are kept in plain text.
Aranacak_icerik: Verify the system\'s shadow file is configured to store only encrypted representations of passwords. The strength of encryption that must be used to hash passwords for all accounts is SHA512.\n\nCheck that the system is configured to create SHA512 hashed passwords with the following command:\n\n# grep -i encrypt /etc/login.defs\nENCRYPT_METHOD SHA512\n\nIf the "/etc/login.defs" configuration file does not exist or allows for password hashes other than SHA512 to be used, this is a finding.
Cozum: Configure the operating system to store only SHA512 encrypted representations of passwords.\n\nAdd or update the following line in "/etc/login.defs":\n\nENCRYPT_METHOD SHA512

Kural_ID: SV-86549r1_rule
Onem: medium
Kural_Basligi: Passwords for new users must be restricted to a 24 hours/1 day minimum lifetime.
Aciklama: Enforcing a minimum password lifetime helps to prevent repeated password changes to defeat the password reuse or history enforcement requirement. If users are allowed to immediately and continually change their password, the password could be repeatedly changed in a short period of time to defeat the organization's policy regarding password reuse.
Aranacak_icerik: Verify the operating system enforces 24 hours/1 day as the minimum password lifetime for new user accounts.\n\nCheck for the value of "PASS_MIN_DAYS" in "/etc/login.defs" with the following command: \n\n# grep -i pass_min_days /etc/login.defs\nPASS_MIN_DAYS     1\n\nIf the "PASS_MIN_DAYS" parameter value is not "1" or greater, or is commented out, this is a finding.
Cozum: Configure the operating system to enforce 24 hours/1 day as the minimum password lifetime.\n\nAdd the following line in "/etc/login.defs" (or modify the line to have the required value):\n\nPASS_MIN_DAYS     1

Kural_ID: SV-86553r1_rule
Onem: medium
Kural_Basligi: Passwords for new users must be restricted to a 60-day maximum lifetime.
Aciklama: Any password, no matter how complex, can eventually be cracked. Therefore, passwords need to be changed periodically. If the operating system does not limit the lifetime of passwords and force users to change their passwords, there is the risk that the operating system passwords could be compromised.
Aranacak_icerik: Verify the operating system enforces a 60-day maximum password lifetime restriction for new user accounts.\n\nCheck for the value of "PASS_MAX_DAYS" in "/etc/login.defs" with the following command:\n\n# grep -i pass_max_days /etc/login.defs\nPASS_MAX_DAYS     60\n\nIf the "PASS_MAX_DAYS" parameter value is not 60 or less, or is commented out, this is a finding.
Cozum: Configure the operating system to enforce a 60-day maximum password lifetime restriction.\n\nAdd the following line in "/etc/login.defs" (or modify the line to have the required value):\n\nPASS_MAX_DAYS     60

Kural_ID: SV-86555r1_rule
Onem: medium
Kural_Basligi: Existing passwords must be restricted to a 60-day maximum lifetime.
Aciklama: Any password, no matter how complex, can eventually be cracked. Therefore, passwords need to be changed periodically. If the operating system does not limit the lifetime of passwords and force users to change their passwords, there is the risk that the operating system passwords could be compromised.
Aranacak_icerik: Check whether the maximum time period for existing passwords is restricted to 60 days.\n\n# awk -F: '$5 > 60 {print $1}' /etc/shadow\n\nIf any results are returned that are not associated with a system account, this is a finding.
Cozum: Configure non-compliant accounts to enforce a 60-day maximum password lifetime restriction.\n\n# chage -M 60 [user]

Kural_ID: SV-86557r1_rule
Onem: medium
Kural_Basligi: Passwords must be prohibited from reuse for a minimum of five generations.
Aciklama: Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. If the information system or application allows the user to consecutively reuse their password when that password has exceeded its defined lifetime, the end result is a password that is not changed per policy requirements.
Aranacak_icerik: Verify the operating system prohibits password reuse for a minimum of five generations.\n\nCheck for the value of the "remember" argument in "/etc/pam.d/system-auth-ac" with the following command:\n\n# grep -i remember /etc/pam.d/system-auth-ac\npassword sufficient pam_unix.so use_authtok sha512 shadow remember=5\n\nIf the line containing the "pam_unix.so" line does not have the "remember" module argument set, or the value of the "remember" module argument is set to less than "5", this is a finding.
Cozum: Configure the operating system to prohibit password reuse for a minimum of five generations.\n\nAdd the following line in "/etc/pam.d/system-auth-ac" (or modify the line to have the required value):\n\npassword sufficient pam_unix.so use_authtok sha512 shadow remember=5\n\nand run the "authconfig" command.

Kural_ID: SV-86561r1_rule
Onem: high
Kural_Basligi: The system must not have accounts configured with blank or null passwords.
Aciklama: If an account has an empty password, anyone could log on and run commands with the privileges of that account. Accounts with empty passwords should never be used in operational environments.
Aranacak_icerik: To verify that null passwords cannot be used, run the following command: \n\n# grep pam_unix /etc/pam.d/common-auth  | grep -v "^#" | grep nullok \n\nIf this produces any output, it may be possible to log on with accounts with empty passwords.\n\nIf null passwords can be used, this is a finding.
Cozum: If an account is configured for password authentication but does not have an assigned password, it may be possible to log on to the account without authenticating.\n\nRemove any instances of the "nullok" or "nullok_secure" option in "/etc/pam.d/common-auth".

Kural_ID: SV-86563r2_rule
Onem: high
Kural_Basligi: The SSH daemon must not allow authentication using an empty password.
Aciklama: Configuring this setting for the SSH daemon provides additional assurance that remote logon via SSH will require a password, even in the event of misconfiguration elsewhere.
Aranacak_icerik: To determine how the SSH daemon\'s "PermitEmptyPasswords" option is set, run the following command:\n\n# grep -i PermitEmptyPasswords /etc/ssh/sshd_config\nPermitEmptyPasswords no\n\nIf no line, a commented line, or a line indicating the value "no" is returned, the required value is set.\n\nIf the required value is not set, this is a finding.
Cozum: To explicitly disallow remote logon from accounts with empty passwords, add or correct the following line in "/etc/ssh/sshd_config":\n\nPermitEmptyPasswords no\n\nThe SSH service must be restarted for changes to take effect.  Any accounts with empty passwords should be disabled immediately, and PAM configuration should prevent users from being able to assign themselves empty passwords.

Kural_ID: SV-86565r1_rule
Onem: medium
Kural_Basligi: The operating system must disable account identifiers (individuals, groups, roles, and devices) if the password expires.
Aciklama: Inactive identifiers pose a risk to systems and applications because attackers may exploit an inactive identifier and potentially obtain undetected access to the system. Owners of inactive accounts will not notice if unauthorized access to their user account has been obtained.\n\nOperating systems need to track periods of inactivity and disable application identifiers after zero days of inactivity.
Aranacak_icerik: Verify the operating system disables account identifiers (individuals, groups, roles, and devices) after the password expires with the following command:\n\n# grep -i inactive /etc/default/useradd\nINACTIVE=0\n\nIf the value is not set to "0", is commented out, or is not defined, this is a finding.
Cozum: Configure the operating system to disable account identifiers (individuals, groups, roles, and devices) after the password expires.\n\nAdd the following line to "/etc/default/useradd" (or modify the line to have the required value):\n\nINACTIVE=0

Kural_ID: SV-86567r2_rule
Onem: medium
Kural_Basligi: Accounts subject to three unsuccessful logon attempts within 15 minutes must be locked for the maximum configurable period.
Aciklama: By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-forcing, is reduced. Limits are imposed by locking the account.\n\n
Aranacak_icerik: Verify the operating system automatically locks an account for the maximum period for which the system can be configured.\n\nCheck that the system locks an account for the maximum period after three unsuccessful logon attempts within a period of 15 minutes with the following command:\n\n# grep pam_faillock.so /etc/pam.d/password-auth-ac\nauth        required       pam_faillock.so preauth silent audit deny=3 even_deny_root unlock_time=604800\nauth        [default=die]  pam_faillock.so authfail audit deny=3 even_deny_root unlock_time=604800\n\nIf the "unlock_time" setting is greater than "604800" on both lines with the "pam_faillock.so" module name or is missing from a line, this is a finding.
Cozum: Configure the operating system to lock an account for the maximum period when three unsuccessful logon attempts in 15 minutes are made.\n\nModify the first three lines of the auth section of the "/etc/pam.d/system-auth-ac" and "/etc/pam.d/password-auth-ac" files to match the following lines:\n\nauth        required       pam_faillock.so preauth silent audit deny=3 even_deny_root fail_interval=900 unlock_time=604800\nauth        sufficient     pam_unix.so try_first_pass\nauth        [default=die]  pam_faillock.so authfail audit deny=3 even_deny_root fail_interval=900 unlock_time=604800\n\nand run the "authconfig" command.

Kural_ID: SV-86569r1_rule
Onem: medium
Kural_Basligi: If three unsuccessful root logon attempts within 15 minutes occur the associated account must be locked.
Aciklama: By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-forcing, is reduced. Limits are imposed by locking the account.\n\n
Aranacak_icerik: Verify the operating system automatically locks the root account until it is released by an administrator when three unsuccessful logon attempts in 15 minutes are made.\n\n# grep pam_faillock.so /etc/pam.d/password-auth-ac\nauth        required       pam_faillock.so preauth silent audit deny=3 even_deny_root fail_interval=900\nauth        [default=die]  pam_faillock.so authfail audit deny=3 even_deny_root fail_interval=900\n\nIf the "even_deny_root" setting is not defined on both lines with the "pam_faillock.so" module name, this is a finding.
Cozum: Configure the operating system to automatically lock the root account until the locked account is released by an administrator when three unsuccessful logon attempts in 15 minutes are made.\n\nModify the first three lines of the auth section of the "/etc/pam.d/system-auth-ac" and "/etc/pam.d/password-auth-ac" files to match the following lines:\n\nauth        required       pam_faillock.so preauth silent audit deny=3 even_deny_root fail_interval=900 unlock_time=604800\nauth        sufficient     pam_unix.so try_first_pass\nauth        [default=die]  pam_faillock.so authfail audit deny=3 even_deny_root fail_interval=900 unlock_time=604800\n\nand run the "authconfig" command.

Kural_ID: SV-86571r1_rule
Onem: medium
Kural_Basligi: Users must provide a password for privilege escalation.
Aciklama: Without re-authentication, users may access resources or perform tasks for which they do not have authorization. \n\nWhen operating systems provide the capability to escalate a functional capability, it is critical the user re-authenticate.\n\n
Aranacak_icerik: Verify the operating system requires users to supply a password for privilege escalation.\n\nCheck the configuration of the "/etc/sudoers" and "/etc/sudoers.d/*" files with the following command:\n\n# grep -i nopasswd /etc/sudoers /etc/sudoers.d/*\n\nIf any uncommented line is found with a "NOPASSWD" tag, this is a finding.
Cozum: Configure the operating system to require users to supply a password for privilege escalation.\n\nCheck the configuration of the "/etc/sudoers" and "/etc/sudoers.d/*" files with the following command:\n\n# grep -i nopasswd /etc/sudoers /etc/sudoers.d/*\n\nRemove any occurrences of "NOPASSWD" tags in the file.

Kural_ID: SV-86573r2_rule
Onem: medium
Kural_Basligi: Users must re-authenticate for privilege escalation.
Aciklama: Without re-authentication, users may access resources or perform tasks for which they do not have authorization. \n\nWhen operating systems provide the capability to escalate a functional capability, it is critical the user reauthenticate.\n\n
Aranacak_icerik: Verify the operating system requires users to reauthenticate for privilege escalation.\n\nCheck the configuration of the "/etc/sudoers" and "/etc/sudoers.d/*" files with the following command:\n\n# grep -i authenticate /etc/sudoers /etc/sudoers.d/*\n\nIf any line is found with a "!authenticate" tag, this is a finding.
Cozum: Configure the operating system to require users to reauthenticate for privilege escalation.\n\nCheck the configuration of the "/etc/sudoers" and "/etc/sudoers.d/*" files with the following command:\n\nRemove any occurrences of "!authenticate" tags in the file.

Kural_ID: SV-86577r1_rule
Onem: high
Kural_Basligi: The operating system must not allow an unattended or automatic logon to the system via a graphical user interface.
Aciklama: Failure to restrict system access to authenticated users negatively impacts operating system security.
Aranacak_icerik: Verify the operating system does not allow an unattended or automatic logon to the system via a graphical user interface.\n\nNote: If the system does not have GNOME installed, this requirement is Not Applicable. \n\nCheck for the value of the "AutomaticLoginEnable" in the "/etc/gdm/custom.conf" file with the following command:\n\n# grep -i automaticloginenable /etc/gdm/custom.conf\nAutomaticLoginEnable=false\n\nIf the value of "AutomaticLoginEnable" is not set to "false", this is a finding.
Cozum: Configure the operating system to not allow an unattended or automatic logon to the system via a graphical user interface.\n\nNote: If the system does not have GNOME installed, this requirement is Not Applicable.\n\nAdd or edit the line for the "AutomaticLoginEnable" parameter in the [daemon] section of the "/etc/gdm/custom.conf" file to "false":\n\n[daemon]\nAutomaticLoginEnable=false

Kural_ID: SV-86579r2_rule
Onem: high
Kural_Basligi: The operating system must not allow an unrestricted logon to the system.
Aciklama: Failure to restrict system access to authenticated users negatively impacts operating system security.
Aranacak_icerik: Verify the operating system does not allow an unrestricted logon to the system via a graphical user interface.\n\nNote: If the system does not have GNOME installed, this requirement is Not Applicable. \n\nCheck for the value of the "TimedLoginEnable" parameter in "/etc/gdm/custom.conf" file with the following command:\n\n# grep -i timedloginenable /etc/gdm/custom.conf\nTimedLoginEnable=false\n\nIf the value of "TimedLoginEnable" is not set to "false", this is a finding.
Cozum: Configure the operating system to not allow an unrestricted account to log on to the system via a graphical user interface.\n\nNote: If the system does not have GNOME installed, this requirement is Not Applicable.\n\nAdd or edit the line for the "TimedLoginEnable" parameter in the [daemon] section of the "/etc/gdm/custom.conf" file to "false":\n\n[daemon]\nTimedLoginEnable=false

Kural_ID: SV-86581r2_rule
Onem: medium
Kural_Basligi: The operating system must not allow users to override SSH environment variables.
Aciklama: Failure to restrict system access to authenticated users negatively impacts operating system security.
Aranacak_icerik: Verify the operating system does not allow users to override environment variables to the SSH daemon.\n\nCheck for the value of the "PermitUserEnvironment" keyword with the following command:\n\n# grep -i permituserenvironment /etc/ssh/sshd_config\nPermitUserEnvironment no\n\nIf the "PermitUserEnvironment" keyword is not set to "no", is missing, or is commented out, this is a finding.
Cozum: Configure the operating system to not allow users to override environment variables to the SSH daemon.\n\nEdit the "/etc/ssh/sshd_config" file to uncomment or add the line for "PermitUserEnvironment" keyword and set the value to "no":\n\nPermitUserEnvironment no\n\nThe SSH service must be restarted for changes to take effect.

Kural_ID: SV-86583r2_rule
Onem: medium
Kural_Basligi: The operating system must not allow a non-certificate trusted host SSH logon to the system.
Aciklama: Failure to restrict system access to authenticated users negatively impacts operating system security.
Aranacak_icerik: Verify the operating system does not allow a non-certificate trusted host SSH logon to the system.\n\nCheck for the value of the "HostbasedAuthentication" keyword with the following command:\n\n# grep -i hostbasedauthentication /etc/ssh/sshd_config\nHostbasedAuthentication no\n\nIf the "HostbasedAuthentication" keyword is not set to "no", is missing, or is commented out, this is a finding.
Cozum: Configure the operating system to not allow a non-certificate trusted host SSH logon to the system.\n\nEdit the "/etc/ssh/sshd_config" file to uncomment or add the line for "HostbasedAuthentication" keyword and set the value to "no":\n\nHostbasedAuthentication no\n\nThe SSH service must be restarted for changes to take effect.

Kural_ID: SV-86587r1_rule
Onem: high
Kural_Basligi: Systems using Unified Extensible Firmware Interface (UEFI) must require authentication upon booting into single-user and maintenance modes.
Aciklama: If the system does not require valid root authentication before it boots into single-user or maintenance mode, anyone who invokes single-user or maintenance mode is granted privileged access to all files on the system. GRUB 2 is the default boot loader for RHEL 7 and is designed to require a password to boot into single-user mode or make modifications to the boot menu.
Aranacak_icerik: Check to see if an encrypted root password is set. On systems that use UEFI, use the following command:\n\n# grep -i password /boot/efi/EFI/redhat/grub.cfg\npassword_pbkdf2 superusers-account password-hash\n\nIf the root password entry does not begin with "password_pbkdf2", this is a finding.
Cozum: Configure the system to encrypt the boot password for root.\n\nGenerate an encrypted grub2 password for root with the following command:\n\nNote: The hash generated is an example.\n\n# grub-mkpasswd-pbkdf2\nEnter Password:\nReenter Password:\n\nPBKDF2 hash of your password is grub.pbkdf2.sha512.10000.F3A7CFAA5A51EED123BE8238C23B25B2A6909AFC9812F0D45\n\nUsing this hash, modify the "/etc/grub.d/10_linux" file with the following commands to add the password to the root entry:\n\n# cat << EOF\n> set superusers="root" password_pbkdf2 root grub.pbkdf2.sha512.10000.F3A7CFAA5A51EED123BE8238C23B25B2A6909AFC9812F0D45\n> EOF\n\nGenerate a new "grub.conf" file with the new password with the following commands:\n\n# grub2-mkconfig --output=/tmp/grub2.cfg\n# mv /tmp/grub2.cfg /boot/efi/EFI/redhat/grub.cfg

Kural_ID: SV-86591r1_rule
Onem: high
Kural_Basligi: The rsh-server package must not be installed.
Aciklama: It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors.\n\nOperating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions).\n\nThe rsh-server service provides an unencrypted remote access service that does not provide for the confidentiality and integrity of user passwords or the remote session and has very weak authentication.\n\nIf a privileged user were to log on using this service, the privileged user password could be compromised.
Aranacak_icerik: Check to see if the rsh-server package is installed with the following command:\n\n# dpkg -l rsh-server\n\nIf the rsh-server package is installed, this is a finding.
Cozum: Configure the operating system to disable non-essential capabilities by removing the rsh-server package from the system with the following command:\n\n# apt-get remove rsh-server

Kural_ID: SV-86593r1_rule
Onem: high
Kural_Basligi: The ypserv package must not be installed.
Aciklama: Removing the "ypserv" package decreases the risk of the accidental (or intentional) activation of NIS or NIS+ services.
Aranacak_icerik: The NIS service provides an unencrypted authentication service that does not provide for the confidentiality and integrity of user passwords or the remote session.\n\nCheck to see if the "ypserve" package is installed with the following command:\n\n# dpkg -l ypserv\n\nIf the "ypserv" package is installed, this is a finding.
Cozum: Configure the operating system to disable non-essential capabilities by removing the "ypserv" package from the system with the following command:\n\n# apt-get remove ypserv

Kural_ID: SV-86597r1_rule
Onem: medium
Kural_Basligi: A file integrity tool must verify the baseline operating system configuration at least weekly.
Aciklama: Unauthorized changes to the baseline configuration could make the system vulnerable to various attacks or allow unauthorized access to the operating system. Changes to operating system configurations can have unintended side effects, some of which may be relevant to security.\n\nDetecting such changes and providing an automated response can help avoid unintended, negative consequences that could ultimately affect the security state of the operating system. The operating system's Information Management Officer (IMO)/Information System Security Officer (ISSO) and System Administrators (SAs) must be notified via email and/or monitoring system trap when there is an unauthorized modification of a configuration item.
Aranacak_icerik: Verify the operating system routinely checks the baseline configuration for unauthorized changes.\n\nNote: A file integrity tool other than Advanced Intrusion Detection Environment (AIDE) may be used, but the tool must be executed at least once per week.\n\nCheck to see if AIDE is installed on the system with the following command:\n\n# dpkg -l aide\n\nIf AIDE is not installed, ask the SA how file integrity checks are performed on the system.\n\nCheck for the presence of a cron job running daily or weekly on the system that executes AIDE daily to scan for changes to the system baseline. The command used in the example will use a daily occurrence.\n\nCheck the "/etc/cron.daily" subdirectory for a "crontab" file controlling the execution of the file integrity application. For example, if AIDE is installed on the system, use the following command:\n\n# ls -al /etc/cron.* | grep aide\n-rwxr-xr-x  1 root root        29 Nov  22  2015 aide\n\nIf the file integrity application does not exist, or a "crontab" file does not exist in the "/etc/cron.daily" or "/etc/cron.weekly" subdirectories, this is a finding.
Cozum: Configure the file integrity tool to automatically run on the system at least weekly. The following example output is generic. It will set cron to run AIDE daily, but other file integrity tools may be used:\n\n# cat /etc/cron.daily/aide \n0 0 * * * /usr/sbin/aide --check | /bin/mail -s "aide integrity check run for <system name>" root@sysname.mil

Kural_ID: SV-86601r1_rule
Onem: high
Kural_Basligi: The operating system must prevent the installation of software, patches, service packs, device drivers, or operating system components from a repository without verification they have been digitally signed using a certificate that is issued by a Certificate Authority (CA) that is recognized and approved by the organization.
Aciklama: Changes to any software components can have significant effects on the overall security of the operating system. This requirement ensures the software has not been tampered with and that it has been provided by a trusted vendor.\n\nAccordingly, patches, service packs, device drivers, or operating system components must be signed with a certificate recognized and approved by the organization.\n\nVerifying the authenticity of the software prior to installation validates the integrity of the patch or upgrade received from a vendor. This verifies the software has not been tampered with and that it has been provided by a trusted vendor. Self-signed certificates are disallowed by this requirement. The operating system should not have to verify the software again. This requirement does not mandate DoD certificates for this purpose; however, the certificate used to verify the software must be from an approved CA.
Aranacak_icerik: Verify the operating system prevents the installation of patches, service packs, device drivers, or operating system components from a repository without verification that they have been digitally signed using a certificate that is recognized and approved by the organization.\n\nCheck that apt verifies the signature of packages from a repository prior to install with the following command:\n\n# grep -i allowunauthenticated /etc/apt/ -r | grep -v "^#" \n/etc/apt/apt.conf.d/99unauthicated:APT::Get::AllowUnauthenticated "true";\n\nIf "AllowUnauthenticated" is  set to "true", ask the System Administrator how the certificates for patches and other operating system components are verified. \n\nIf there is no process to validate certificates that is approved by the organization, this is a finding.
Cozum: Configure the operating system to verify the signature of packages from a repository prior to install by setting the following option in the "/etc/apt/apt.conf.d/99unauthicated" file:\n\nAPT::Get::AllowUnauthenticated "true"; 

Kural_ID: SV-86603r1_rule
Onem: high
Kural_Basligi: The operating system must prevent the installation of software, patches, service packs, device drivers, or operating system components of local packages without verification they have been digitally signed using a certificate that is issued by a Certificate Authority (CA) that is recognized and approved by the organization.
Aciklama: Changes to any software components can have significant effects on the overall security of the operating system. This requirement ensures the software has not been tampered with and that it has been provided by a trusted vendor.\n\nAccordingly, patches, service packs, device drivers, or operating system components must be signed with a certificate recognized and approved by the organization.\n\nVerifying the authenticity of the software prior to installation validates the integrity of the patch or upgrade received from a vendor. This verifies the software has not been tampered with and that it has been provided by a trusted vendor. Self-signed certificates are disallowed by this requirement. The operating system should not have to verify the software again. This requirement does not mandate DoD certificates for this purpose; however, the certificate used to verify the software must be from an approved CA.
Aranacak_icerik: Verify the operating system prevents the installation of patches, service packs, device drivers, or operating system components of local packages without verification that they have been digitally signed using a certificate that is recognized and approved by the organization.\n\nCheck that dpkg verifies the signature of local packages prior to install with the following command:\n\n# grep no-debsig /etc/dpkg/ -r\n/etc/dpkg/dpkg.cfg:no-debsig\n\nIf "no-debsig" is set, ask the System Administrator how the signatures of local packages and other operating system components are verified. \n\nIf there is no process to validate the signatures of local packages that is approved by the organization, this is a finding.
Cozum: Configure the operating system to verify the signature of local packages prior to install by setting the following option in the "/etc/dpkg/dpkg.cfg" file:\n\n#no-debsig

Kural_ID: SV-86607r1_rule
Onem: medium
Kural_Basligi: USB mass storage must be disabled.
Aciklama: USB mass storage permits easy introduction of unknown devices, thereby facilitating malicious activity.\n\n
Aranacak_icerik: If there is an HBSS with a Device Control Module and a Data Loss Prevention mechanism, this requirement is not applicable.\n\nVerify the operating system disables the ability to use USB mass storage devices.\n\nCheck to see if USB mass storage is disabled with the following command:\n\n#grep -i usb-storage /etc/modprobe.d/*\n\ninstall usb-storage /bin/true\n\nIf the command does not return any output, and use of USB storage devices is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.
Cozum: Configure the operating system to disable the ability to use USB mass storage devices.\n\nCreate a file under "/etc/modprobe.d" with the following command:\n\n#touch /etc/modprobe.d/nousbstorage\n\nAdd the following line to the created file:\n\ninstall usb-storage /bin/true

Kural_ID: SV-86609r1_rule
Onem: medium
Kural_Basligi: File system automounter must be disabled unless required.
Aciklama: Automatically mounting file systems permits easy introduction of unknown devices, thereby facilitating malicious activity.\n\n
Aranacak_icerik: Verify the operating system disables the ability to automount devices.\n\nCheck to see if automounter service is active with the following command:\n\n# systemctl status autofs\nautofs.service - Automounts filesystems on demand\n   Loaded: loaded (/usr/lib/systemd/system/autofs.service; disabled)\n   Active: inactive (dead)\n\nIf the "autofs" status is set to "active" and is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.
Cozum: Configure the operating system to disable the ability to automount devices.\n\nTurn off the automount service with the following command:\n\n# systemctl disable autofs\n\nIf "autofs" is required for Network File System (NFS), it must be documented with the ISSO.

Kural_ID: SV-86613r2_rule
Onem: high
Kural_Basligi: The operating system must enable AppArmor.
Aciklama: Without verification of the security functions, security functions may not operate correctly and the failure may go unnoticed. Security function is defined as the hardware, software, and/or firmware of the information system responsible for enforcing the system security policy and supporting the isolation of code and data on which the protection is based. Security functionality includes, but is not limited to, establishing system accounts, configuring access authorizations (i.e., permissions, privileges), setting events to be audited, and setting intrusion detection parameters.\n\nThis requirement applies to operating systems performing security function verification/testing and/or systems and environments that require this functionality.
Aranacak_icerik: Verify the operating system verifies correct operation of all security functions.\n\nCheck if "AppArmor" is active with the following command:\n\n# grep -v "^#" | grep -i "apparmor=1" /boot/grub/grub.cfg\n\nIf output not include apparmor=1, this is a finding.
Cozum: Configure the operating system to verify correct operation of all security functions.\n\nSet the "AppArmor" status by modifying the "/boot/grub/grub.cfg" file to have the following line:\n\nlinux	/boot/vmlinuz-4.4.0-53-generic root=UUID=4a404115-8a9b-4c7d-8266-7541f0b8584c ro  quiet splash $vt_handoff init=/sbin/upstar apparmor=1 \n\nA reboot is required for the changes to take effect.

Kural_ID: SV-86619r1_rule
Onem: medium
Kural_Basligi: The operating system must define default permissions for all authenticated users in such a way that the user can only read and modify their own files.
Aciklama: Setting the most restrictive default permissions ensures that when new accounts are created, they do not have unnecessary access.
Aranacak_icerik: Verify the operating system defines default permissions for all authenticated users in such a way that the user can only read and modify their own files.\n\nCheck for the value of the "UMASK" parameter in "/etc/login.defs" file with the following command:\n\nNote: If the value of the "UMASK" parameter is set to "000" in "/etc/login.defs" file, the Severity is raised to a CAT I.\n\n# grep -i umask /etc/login.defs\nUMASK  077\n\nIf the value for the "UMASK" parameter is not "077", or the "UMASK" parameter is missing or is commented out, this is a finding.
Cozum: Configure the operating system to define default permissions for all authenticated users in such a way that the user can only read and modify their own files.\n\nAdd or edit the line for the "UMASK" parameter in "/etc/login.defs" file to "077":\n\nUMASK  077

Kural_ID: SV-86621r2_rule
Onem: high
Kural_Basligi: The operating system must be a vendor supported release.
Aciklama: An operating system release is considered "supported" if the vendor continues to provide security patches for the product. With an unsupported release, it will not be possible to resolve security issues discovered in the system software.
Aranacak_icerik: Verify the version of the operating system is vendor supported.\n\nCheck the version of the operating system with the following command:\n\n# # cat /etc/issue\n\nDebian GNU/Linux 9 \n \l\n\n\n\nIf the release is not supported by the vendor, this is a finding.
Cozum: Upgrade to a supported version of the operating system.

Kural_ID: SV-86623r3_rule
Onem: medium
Kural_Basligi: Vendor packaged system security patches and updates must be installed and up to date.
Aciklama: Timely patching is critical for maintaining the operational availability, confidentiality, and integrity of information technology (IT) systems. However, failure to keep operating system and application software patched is a common mistake made by IT professionals. New patches are released daily, and it is often difficult for even experienced System Administrators to keep abreast of all the new patches. When new weaknesses in an operating system exist, patches are usually made available by the vendor to resolve the problems. If the most recent security patches and updates are not installed, unauthorized users may take advantage of weaknesses in the unpatched software. The lack of prompt attention to patching could result in a system compromise.
Aranacak_icerik: Verify the operating system security patches and updates are installed and up to date. Updates are required to be applied with a frequency determined by the site or Program Management Office (PMO). \n\nObtain the list of available package security updates from Red Hat. The URL for updates is https://rhn.redhat.com/errata/. It is important to note that updates provided by Red Hat may not be present on the system if the underlying packages are not installed.\n\nCheck that the available package security updates have been installed on the system with the following command:\n\n# aptitude search '~U'\n
i A apache2-bin                                                                                       - Apache HTTP Server (modules and other binary files)\n                                                        
i   debian-archive-keyring                                                                            - GnuPG archive keys of the Debian archive                                                                   \n
i A firefox-esr                                                                                       - Mozilla Firefox web browser - Extended Support Release (ESR)                                               
\n
i   iceweasel                                                                                         - Web browser based on Firefox - Transitional package                                                        
\n
i   libc-bin                                                                                          - GNU C Library: Binaries                                                                                    
\n
i A libc-dev-bin                                                                                      - GNU C Library: Development binaries                                                                        
\n
i   libc6                                                                                             - GNU C Library: Shared libraries                                                                            
\n
i A libc6-dev                                                                                         - GNU C Library: Development Libraries and Header Files                                                      
\n
i A libexpat1                                                                                         - XML parsing C library - runtime library                                                                    
\n
i   libffi6                                                                                           - Foreign Function Interface library runtime                                                                 
\n
i   libgcrypt20                                                                                       - LGPL Crypto library - runtime library                                                                      
\n
i   libgnutls-deb0-28                                                                                 - GNU TLS library - main runtime library                                                                     
\n
i   libgnutls-openssl27                                                                               - GNU TLS library - OpenSSL wrapper                                                                          
\n
i A libgraphite2-3                                                                                    - Font rendering engine for Complex Scripts -- library                                                       
\n
i A libmwaw-0.3-3                                                                                     - import library for some old Mac text documents                                                             
\n
i A linux-compiler-gcc-4.8-x86                                                                        - Compiler for Linux on x86 (meta-package)                                                                   
\n
i   linux-headers-3.16.0-4-amd64                                                                      - Header files for Linux 3.16.0-4-amd64                                                                      
\n
i A linux-headers-3.16.0-4-common                                                                     - Common header files for Linux 3.16.0-4                                                                     
\n
i A linux-image-3.16.0-4-amd64                                                                        - Linux 3.16 for 64-bit PCs                                                                                  
\n
i A linux-libc-dev                                                                                    - Linux support headers for userspace development                                                            
\n
i   locales                                                                                           - GNU C Library: National Language (locale) data [support]                                                   
\n
i   multiarch-support                                                                                 - Transitional package to ensure multiarch compatibility \n\nIf package updates have not been performed on the system within the timeframe that the site/program documentation requires, this is a finding. \n\nTypical update frequency may be overridden by Information Assurance Vulnerability Alert (IAVA) notifications from CYBERCOM.\n\nIf the operating system is in non-compliance with the Information Assurance Vulnerability Management (IAVM) process, this is a finding.
Cozum: Install the operating system patches or updated packages available from Red Hat within 30 days or sooner as local policy dictates.

Kural_ID: SV-86627r1_rule
Onem: low
Kural_Basligi: All Group Identifiers (GIDs) referenced in the /etc/passwd file must be defined in the /etc/group file.
Aciklama: If a user is assigned the GID of a group not existing on the system, and a group with the GID is subsequently created, the user may have unintended rights to any files associated with the group.
Aranacak_icerik: Verify all GIDs referenced in the "/etc/passwd" file are defined in the "/etc/group" file.\n\nCheck that all referenced GIDs exist with the following command:\n\n# pwck -r\n\nIf GIDs referenced in "/etc/passwd" file are returned as not defined in "/etc/group" file, this is a finding.
Cozum: Configure the system to define all GIDs found in the "/etc/passwd" file by modifying the "/etc/group" file to add any non-existent group referenced in the "/etc/passwd" file, or change the GIDs referenced in the "/etc/passwd" file to a group that exists in "/etc/group".

Kural_ID: SV-86629r1_rule
Onem: high
Kural_Basligi: The root account must be the only account having unrestricted access to the system.
Aciklama: If an account other than root also has a User Identifier (UID) of "0", it has root authority, giving that account unrestricted access to the entire operating system. Multiple accounts with a UID of "0" afford an opportunity for potential intruders to guess a password for a privileged account.
Aranacak_icerik: Check the system for duplicate UID "0" assignments with the following command:\n\n# awk -F: \'$3 == 0 {print $1}\' /etc/passwd\n\nIf any accounts other than root have a UID of "0", this is a finding.
Cozum: Change the UID of any account on the system, other than root, that has a UID of "0". \n\nIf the account is associated with system commands or applications, the UID should be changed to one greater than "0" but less than "1000". Otherwise, assign a UID of greater than "1000" that has not already been assigned.

Kural_ID: SV-86631r1_rule
Onem: medium
Kural_Basligi: All files and directories must have a valid owner.
Aciklama: Unowned files and directories may be unintentionally inherited if a user is assigned the same User Identifier "UID" as the UID of the un-owned files.
Aranacak_icerik: Verify all files and directories on the system have a valid owner.\n\nCheck the owner of all files and directories with the following command:\n\nNote: The value after -fstype must be replaced with the filesystem type. XFS is used as an example.\n\n# find / -xdev -fstype xfs -nouser\n\nIf any files on the system do not have an assigned owner, this is a finding.
Cozum: Either remove all files and directories from the system that do not have a valid user, or assign a valid user to all unowned files and directories on the system with the "chown" command:\n\n# chown <user> <file>

Kural_ID: SV-86633r1_rule
Onem: medium
Kural_Basligi: All files and directories must have a valid group owner.
Aciklama: Files without a valid group owner may be unintentionally inherited if a group is assigned the same Group Identifier (GID) as the GID of the files without a valid group owner.
Aranacak_icerik: Verify all files and directories on the system have a valid group.\n\nCheck the owner of all files and directories with the following command:\n\nNote: The value after -fstype must be replaced with the filesystem type. XFS is used as an example.\n\n# find / -xdev -fstype xfs -nogroup\n\nIf any files on the system do not have an assigned group, this is a finding.
Cozum: Either remove all files and directories from the system that do not have a valid group, or assign a valid group to all files and directories on the system with the "chgrp" command:\n\n# chgrp <group> <file>

Kural_ID: SV-86635r1_rule
Onem: medium
Kural_Basligi: All local interactive users must have a home directory assigned in the /etc/passwd file.
Aciklama: If local interactive users are not assigned a valid home directory, there is no place for the storage and control of files they should own.
Aranacak_icerik: Verify local interactive users on the system have a home directory assigned.\n\nCheck for missing local interactive user home directories with the following command:\n\n# pwck -r\nuser \'lp\': directory \'/var/spool/lpd\' does not exist\nuser \'news\': directory \'/var/spool/news\' does not exist\nuser \'uucp\': directory \'/var/spool/uucp\' does not exist\nuser \'smithj\': directory \'/home/smithj\' does not exist\n\nAsk the System Administrator (SA) if any users found without home directories are local interactive users. If the SA is unable to provide a response, check for users with a User Identifier (UID) of 1000 or greater with the following command:\n\n# cut -d: -f 1,3 /etc/passwd | egrep ":[1-4][0-9]{2}$|:[0-9]{1,2}$"\n\nIf any interactive users do not have a home directory assigned, this is a finding.
Cozum: Assign home directories to all local interactive users that currently do not have a home directory assigned.

Kural_ID: SV-86641r1_rule
Onem: medium
Kural_Basligi: All local interactive user home directories must have mode 0750 or less permissive.
Aciklama: Excessive permissions on local interactive user home directories may allow unauthorized access to user files by other users.
Aranacak_icerik: Verify the assigned home directory of all local interactive users has a mode of "0750" or less permissive.\n\nCheck the home directory assignment for all non-privileged users on the system with the following command:\n\nNote: This may miss interactive users that have been assigned a privileged User Identifier (UID). Evidence of interactive use may be obtained from a number of log files containing system logon information.\n\n# ls -ld $ (egrep \':[0-9]{4}\' /etc/passwd | cut -d: -f6)\n-rwxr-x--- 1 smithj users  18 Mar  5 17:06 /home/smithj\n\nIf home directories referenced in "/etc/passwd" do not have a mode of "0750" or less permissive, this is a finding.
Cozum: [u'Change the mode of interactive user\u2019s home directories to "0750". To change the mode of a local interactive user\u2019s home directory, use the following command:\n\nNote: The example will be for the user "smithj".\n\n# chmod 0750 /home/smithj

Kural_ID: SV-86643r2_rule
Onem: medium
Kural_Basligi: All local interactive user home directories must be owned by their respective users.
Aciklama: If a local interactive user does not own their home directory, unauthorized users could access or modify the user's files, and the users may not be able to access their own files.
Aranacak_icerik: Verify the assigned home directory of all local interactive users on the system exists.\n\nCheck the home directory assignment for all local interactive non-privileged users on the system with the following command:\n\nNote: This may miss interactive users that have been assigned a privileged UID. Evidence of interactive use may be obtained from a number of log files containing system logon information.\n\n# ls -ld $ (egrep \':[0-9]{4}\' /etc/passwd | cut -d: -f6)\n-rwxr-x--- 1 smithj users  18 Mar  5 17:06 /home/smithj\n\nIf any home directories referenced in "/etc/passwd" are returned as not defined, this is a finding.
Cozum: [u'Change the owner of a local interactive user\u2019s home directories to that owner. To change the owner of a local interactive user\u2019s home directory, use the following command:\n\nNote: The example will be for the user smithj, who has a home directory of "/home/smithj".\n\n# chown smithj /home/smithj

Kural_ID: SV-86645r2_rule
Onem: medium
Kural_Basligi: All local interactive user home directories must be group-owned by the home directory owners primary group.
Aciklama: If the Group Identifier (GID) of a local interactive user\u2019s home directory is not the same as the primary GID of the user, this would allow unauthorized access to the user\u2019s files, and users that share the same group may not be able to access files that they legitimately should.
Aranacak_icerik: [u'Verify the assigned home directory of all local interactive users is group-owned by that user\u2019s primary GID.\n\nCheck the home directory assignment for all non-privileged users on the system with the following command:\n\nNote: This may miss local interactive users that have been assigned a privileged UID. Evidence of interactive use may be obtained from a number of log files containing system logon information.\n\n# ls -ld $ (egrep \':[0-9]{4}\' /etc/passwd | cut -d: -f6)\n-rwxr-x--- 1 smithj users  18 Mar  5 17:06 /home/smithj\n\nCheck the user\'s primary group with the following command:\n\n# grep users /etc/group\nusers:x:250:smithj,jonesj,jacksons\n\nIf the user home directory referenced in "/etc/passwd" is not group-owned by that user\u2019s primary GID, this is a finding.
Cozum: [u'Change the group owner of a local interactive user\u2019s home directory to the group found in "/etc/passwd". To change the group owner of a local interactive user\u2019s home directory, use the following command:\n\nNote: The example will be for the user "smithj", who has a home directory of "/home/smithj", and has a primary group of users.\n\n# chgrp users /home/smithj

Kural_ID: SV-86647r1_rule
Onem: medium
Kural_Basligi: All files and directories contained in local interactive user home directories must be owned by the owner of the home directory.
Aciklama: If local interactive users do not own the files in their directories, unauthorized users may be able to access them. Additionally, if files are not owned by the user, this could be an indication of system compromise.
Aranacak_icerik: [u'Verify all files and directories in a local interactive user\u2019s home directory are owned by the user.\n\nCheck the owner of all files and directories in a local interactive user\u2019s home directory with the following command:\n\nNote: The example will be for the user "smithj", who has a home directory of "/home/smithj".\n\n# ls -lLR /home/smithj\n-rw-r--r-- 1 smithj smithj  18 Mar  5 17:06 file1\n-rw-r--r-- 1 smithj smithj 193 Mar  5 17:06 file2\n-rw-r--r-- 1 smithj smithj 231 Mar  5 17:06 file3\n\nIf any files are found with an owner different than the home directory user, this is a finding.
Cozum: [u'Change the owner of a local interactive user\u2019s files and directories to that owner. To change the owner of a local interactive user\u2019s files and directories, use the following command:\n\nNote: The example will be for the user smithj, who has a home directory of "/home/smithj".\n\n# chown smithj /home/smithj/<file or directory>

Kural_ID: SV-86649r1_rule
Onem: medium
Kural_Basligi: All files and directories contained in local interactive user home directories must be group-owned by a group of which the home directory owner is a member.
Aciklama: If a local interactive user\u2019s files are group-owned by a group of which the user is not a member, unintended users may be able to access them.
Aranacak_icerik: [u'Verify all files and directories in a local interactive user home directory are group-owned by a group the user is a member of.\n\nCheck the group owner of all files and directories in a local interactive user\u2019s home directory with the following command:\n\nNote: The example will be for the user "smithj", who has a home directory of "/home/smithj".\n\n# ls -lLR /<home directory>/<users home directory>/\n-rw-r--r-- 1 smithj smithj  18 Mar  5 17:06 file1\n-rw-r--r-- 1 smithj smithj 193 Mar  5 17:06 file2\n-rw-r--r-- 1 smithj sa        231 Mar  5 17:06 file3\n\nIf any files are found with an owner different than the group home directory user, check to see if the user is a member of that group with the following command:\n\n# grep smithj /etc/group\nsa:x:100:juan,shelley,bob,smithj \nsmithj:x:521:smithj\n\nIf the user is not a member of a group that group owns file(s) in a local interactive user\u2019s home directory, this is a finding.
Cozum: [u'Change the group of a local interactive user\u2019s files and directories to a group that the interactive user is a member of. To change the group owner of a local interactive user\u2019s files and directories, use the following command:\n\nNote: The example will be for the user smithj, who has a home directory of "/home/smithj" and is a member of the users group.\n\n# chgrp users /home/smithj/<file>

Kural_ID: SV-86651r1_rule
Onem: medium
Kural_Basligi: All files and directories contained in local interactive user home directories must have mode 0750 or less permissive.
Aciklama: If a local interactive user files have excessive permissions, unintended users may be able to access or modify them.
Aranacak_icerik: Verify all files and directories contained in a local interactive user home directory, excluding local initialization files, have a mode of "0750".\n\nCheck the mode of all non-initialization files in a local interactive user home directory with the following command:\n\nFiles that begin with a "." are excluded from this requirement.\n\nNote: The example will be for the user "smithj", who has a home directory of "/home/smithj".\n\n# ls -lLR /home/smithj\n-rwxr-x--- 1 smithj smithj  18 Mar  5 17:06 file1\n-rwxr----- 1 smithj smithj 193 Mar  5 17:06 file2\n-rw-r-x--- 1 smithj smithj 231 Mar  5 17:06 file3\n\nIf any files are found with a mode more permissive than "0750", this is a finding.
Cozum: Set the mode on files and directories in the local interactive user home directory with the following command:\n\nNote: The example will be for the user smithj, who has a home directory of "/home/smithj" and is a member of the users group.\n\n# chmod 0750 /home/smithj/<file>

Kural_ID: SV-86653r1_rule
Onem: medium
Kural_Basligi: All local initialization files for interactive users must be owned by the home directory user or root.
Aciklama: Local initialization files are used to configure the user's shell environment upon logon. Malicious modification of these files could compromise accounts upon logon.
Aranacak_icerik: [u'Verify all local initialization files for interactive users are owned by the home directory user or root.\n\nCheck the owner on all local initialization files with the following command:\n\nNote: The example will be for the "smithj" user, who has a home directory of "/home/smithj".\n\n# ls -al /home/smithj/.* | more\n-rwxr-xr-x  1 smithj users        896 Mar 10  2011 .bash_profile\n-rwxr-xr-x  1 smithj users        497 Jan  6  2007 .login\n-rwxr-xr-x  1 smithj users        886 Jan  6  2007 .profile\n\nIf any file that sets a local interactive user\u2019s environment variables to override the system is not owned by the home directory owner or root, this is a finding.
Cozum: Set the owner of the local initialization files for interactive users to either the directory owner or root with the following command:\n\nNote: The example will be for the smithj user, who has a home directory of "/home/smithj".\n\n# chown smithj /home/smithj/.*

Kural_ID: SV-86655r2_rule
Onem: medium
Kural_Basligi: Local initialization files for local interactive users must be group-owned by the users primary group or root.
Aciklama: Local initialization files for interactive users are used to configure the user's shell environment upon logon. Malicious modification of these files could compromise accounts upon logon.
Aranacak_icerik: [u'Verify the local initialization files of all local interactive users are group-owned by that user\u2019s primary Group Identifier (GID).\n\nCheck the home directory assignment for all non-privileged users on the system with the following command:\n\nNote: The example will be for the smithj user, who has a home directory of "/home/smithj" and a primary group of "users".\n\n# cut -d: -f 1,4,6 /etc/passwd | egrep ":[1-4][0-9]{3}"\nsmithj:1000:/home/smithj\n\n# grep 1000 /etc/group\nusers:x:1000:smithj,jonesj,jacksons \n\nNote: This may miss interactive users that have been assigned a privileged User Identifier (UID). Evidence of interactive use may be obtained from a number of log files containing system logon information.\n\nCheck the group owner of all local interactive users\u2019 initialization files with the following command:\n\n# ls -al /home/smithj/.*\n-rwxr-xr-x  1 smithj users        896 Mar 10  2011 .profile\n-rwxr-xr-x  1 smithj users        497 Jan  6  2007 .login\n-rwxr-xr-x  1 smithj users        886 Jan  6  2007 .something\n\nIf all local interactive users\u2019 initialization files are not group-owned by that user\u2019s primary GID, this is a finding.
Cozum: [u'Change the group owner of a local interactive user\u2019s files to the group found in "/etc/passwd" for the user. To change the group owner of a local interactive user home directory, use the following command:\n\nNote: The example will be for the user smithj, who has a home directory of "/home/smithj", and has a primary group of users.\n\n# chgrp users /home/smithj/<file>

Kural_ID: SV-86657r1_rule
Onem: medium
Kural_Basligi: All local initialization files must have mode 0740 or less permissive.
Aciklama: Local initialization files are used to configure the user's shell environment upon logon. Malicious modification of these files could compromise accounts upon logon.
Aranacak_icerik: Verify that all local initialization files have a mode of "0740" or less permissive.\n\nCheck the mode on all local initialization files with the following command:\n\nNote: The example will be for the smithj user, who has a home directory of "/home/smithj".\n\n# ls -al /home/smithj/.* | more\n-rwxr-xr-x  1 smithj users        896 Mar 10  2011 .profile\n-rwxr-xr-x  1 smithj users        497 Jan  6  2007 .login\n-rwxr-xr-x  1 smithj users        886 Jan  6  2007 .something\n\nIf any local initialization files have a mode more permissive than "0740", this is a finding.
Cozum: Set the mode of the local initialization files to "0740" with the following command:\n\nNote: The example will be for the smithj user, who has a home directory of "/home/smithj".\n\n# chmod 0740 /home/smithj/.<INIT_FILE>

Kural_ID: SV-86659r2_rule
Onem: medium
Kural_Basligi: All local interactive user initialization files executable search paths must contain only paths that resolve to the users home directory.
Aciklama: The executable search path (typically the PATH environment variable) contains a list of directories for the shell to search to find executables. If this path includes the current working directory (other than the user\u2019s home directory), executables in these directories may be executed instead of system commands. This variable is formatted as a colon-separated list of directories. If there is an empty entry, such as a leading or trailing colon or two consecutive colons, this is interpreted as the current working directory. If deviations from the default system search path for the local interactive user are required, they must be documented with the Information System Security Officer (ISSO).
Aranacak_icerik: [u'Verify that all local interactive user initialization files\' executable search path statements do not contain statements that will reference a working directory other than the users\u2019 home directory.\n\nCheck the executable search path statement for all local interactive user initialization files in the users\' home directory with the following commands:\n\nNote: The example will be for the smithj user, which has a home directory of "/home/smithj".\n\n# grep -i path /home/smithj/.*\n/home/smithj/.bash_profile:PATH=$PATH:$HOME/.local/bin:$HOME/bin\n/home/smithj/.bash_profile:export PATH\n\nIf any local interactive user initialization files have executable search path statements that include directories outside of their home directory, this is a finding.
Cozum: Configure the "/etc/fstab" to use the "nosuid" option on file systems that contain user home directories for interactive users.

Kural_ID: SV-86661r1_rule
Onem: medium
Kural_Basligi: Local initialization files must not execute world-writable programs.
Aciklama: If user start-up files execute world-writable programs, especially in unprotected directories, they could be maliciously modified to destroy user files or otherwise compromise the system at the user level. If the system is compromised at the user level, it is easier to elevate privileges to eventually compromise the system at the root and network level.
Aranacak_icerik: [u'Verify that local initialization files do not execute world-writable programs.\n\nCheck the system for world-writable files with the following command:\n\n# find / -perm -002 -type f -exec ls -ld {} \\; | more\n\nFor all files listed, check for their presence in the local initialization files with the following commands:\n\nNote: The example will be for a system that is configured to create users\u2019 home directories in the "/home" directory.\n\n# grep <file> /home/*/.*\n\nIf any local initialization files are found to reference world-writable files, this is a finding.
Cozum: Set the mode on files being executed by the local initialization files with the following command:\n\n# chmod 0755  <file>

Kural_ID: SV-86665r2_rule
Onem: medium
Kural_Basligi: File systems that contain user home directories must be mounted to prevent files with the setuid and setgid bit set from being executed.
Aciklama: The "nosuid" mount option causes the system to not execute setuid and setgid files with owner privileges. This option must be used for mounting any file system not containing approved setuid and setguid files. Executing files from untrusted file systems increases the opportunity for unprivileged users to attain unauthorized administrative access.
Aranacak_icerik: Verify file systems that contain user home directories are mounted with the "nosuid" option.\n\nFind the file system(s) that contain the user home directories with the following command:\n\nNote: If a separate file system has not been created for the user home directories (user home directories are mounted under "/"), this is not a finding as the "nosuid" option cannot be used on the "/" system.\n\n# cut -d: -f 1,6 /etc/passwd | egrep ":[1-4][0-9]{3}"\nsmithj:/home/smithj\nthomasr:/home/thomasr\n\nCheck the file systems that are mounted at boot time with the following command:\n\n# more /etc/fstab\n\nUUID=a411dc99-f2a1-4c87-9e05-184977be8539 /home   ext4   rw,relatime,discard,data=ordered,nosuid 0 2\n\nIf a file system found in "/etc/fstab" refers to the user home directory file system and it does not have the "nosuid" option set, this is a finding.
Cozum: Configure the "/etc/fstab" to use the "nosuid" option on file systems that contain user home directories.

Kural_ID: SV-86667r1_rule
Onem: medium
Kural_Basligi: File systems that are used with removable media must be mounted to prevent files with the setuid and setgid bit set from being executed.
Aciklama: The "nosuid" mount option causes the system to not execute "setuid" and "setgid" files with owner privileges. This option must be used for mounting any file system not containing approved "setuid" and "setguid" files. Executing files from untrusted file systems increases the opportunity for unprivileged users to attain unauthorized administrative access.
Aranacak_icerik: Verify file systems that are used for removable media are mounted with the "nouid" option.\n\nCheck the file systems that are mounted at boot time with the following command:\n\n# more /etc/fstab\n\nUUID=2bc871e4-e2a3-4f29-9ece-3be60c835222     /mnt/usbflash      vfat   noauto,owner,ro,nosuid                        0 0\n\nIf a file system found in "/etc/fstab" refers to removable media and it does not have the "nosuid" option set, this is a finding.
Cozum: Configure the "/etc/fstab" to use the "nosuid" option on file systems that are associated with removable media.

Kural_ID: SV-86669r1_rule
Onem: medium
Kural_Basligi: File systems that are being imported via Network File System (NFS) must be mounted to prevent files with the setuid and setgid bit set from being executed.
Aciklama: The "nosuid" mount option causes the system to not execute "setuid" and "setgid" files with owner privileges. This option must be used for mounting any file system not containing approved "setuid" and "setguid" files. Executing files from untrusted file systems increases the opportunity for unprivileged users to attain unauthorized administrative access.
Aranacak_icerik: Verify file systems that are being NFS exported are mounted with the "nosuid" option.\n\nFind the file system(s) that contain the directories being exported with the following command:\n\n# more /etc/fstab | grep nfs\n\nUUID=e06097bb-cfcd-437b-9e4d-a691f5662a7d    /store           nfs           rw,nosuid                                                    0 0\n\nIf a file system found in "/etc/fstab" refers to NFS and it does not have the "nosuid" option set, this is a finding.
Cozum: Configure the "/etc/fstab" to use the "nosuid" option on file systems that are being exported via NFS.

Kural_ID: SV-86671r1_rule
Onem: medium
Kural_Basligi: All world-writable directories must be group-owned by root, sys, bin, or an application group.
Aciklama: If a world-writable directory has the sticky bit set and is not group-owned by a privileged Group Identifier (GID), unauthorized users may be able to modify files created by others.\n\nThe only authorized public directories are those temporary directories supplied with the system or those designed to be temporary file repositories. The setting is normally reserved for directories used by the system and by users for temporary file storage, (e.g., /tmp), and for directories requiring global read/write access.
Aranacak_icerik: Verify all world-writable directories are group-owned by root, sys, bin, or an application group.\n\nCheck the system for world-writable directories with the following command:\n\nNote: The value after -fstype must be replaced with the filesystem type. XFS is used as an example.\n\n# find / -xdev -perm -002 -type d -fstype xfs -exec ls -lLd {} \\;\ndrwxrwxrwt. 2 root root 40 Aug 26 13:07 /dev/mqueue\ndrwxrwxrwt. 2 root root 220 Aug 26 13:23 /dev/shm\ndrwxrwxrwt. 14 root root 4096 Aug 26 13:29 /tmp\n\nIf any world-writable directories are not owned by root, sys, bin, or an application group associated with the directory, this is a finding.
Cozum: Change the group of the world-writable directories to root with the following command:\n\n# chgrp root <directory>

Kural_ID: SV-86677r1_rule
Onem: medium
Kural_Basligi: If the cron.allow file exists it must be owned by root.
Aciklama: If the owner of the "cron.allow" file is not set to root, the possibility exists for an unauthorized user to view or to edit sensitive information.
Aranacak_icerik: Verify that the "cron.allow" file is owned by root.\n\nCheck the owner of the "cron.allow" file with the following command:\n\n# l s -al /etc/cron.allow\n-rw------- 1 root root 6 Mar  5  2011 /etc/cron.allow\n\nIf the "cron.allow" file exists and has an owner other than root, this is a finding.
Cozum: Set the owner on the "/etc/cron.allow" file to root with the following command:\n\n# chown root /etc/cron.allow

Kural_ID: SV-86679r1_rule
Onem: medium
Kural_Basligi: If the cron.allow file exists it must be group-owned by root.
Aciklama: If the group owner of the "cron.allow" file is not set to root, sensitive information could be viewed or edited by unauthorized users.
Aranacak_icerik: Verify that the "cron.allow" file is group-owned by root.\n\nCheck the group owner of the "cron.allow" file with the following command:\n\n# ls -al /etc/cron.allow\n-rw------- 1 root root 6 Mar  5  2011 /etc/cron.allow\n\nIf the "cron.allow" file exists and has a group owner other than root, this is a finding.
Cozum: Set the group owner on the "/etc/cron.allow" file to root with the following command:\n\n# chgrp root /etc/cron.allow

Kural_ID: SV-86683r1_rule
Onem: low
Kural_Basligi: A separate file system must be used for user home directories (such as /home or an equivalent).
Aciklama: The use of separate file systems for different paths can protect the system from failures resulting from a file system becoming full or failing.
Aranacak_icerik: [u'Verify that a separate file system/partition has been created for non-privileged local interactive user home directories.\n\nCheck the home directory assignment for all non-privileged users (those with a UID greater than 1000) on the system with the following command:\n\n#cut -d: -f 1,3,6,7 /etc/passwd | egrep ":[1-4][0-9]{3}" | tr ":" "\\t"\n\nadamsj /home/adamsj /bin/bash\njacksonm /home/jacksonm /bin/bash\nsmithj /home/smithj /bin/bash\n\nThe output of the command will give the directory/partition that contains the home directories for the non-privileged users on the system (in this example, /home) and users\u2019 shell. All accounts with a valid shell (such as /bin/bash) are considered interactive users.\n\nCheck that a file system/partition has been created for the non-privileged interactive users with the following command:\n\nNote: The partition of /home is used in the example.\n\n# grep /home /etc/fstab\nUUID=333ada18    /home                   ext4    noatime,nobarrier,nodev  1 2\n\nIf a separate entry for the file system/partition that contains the non-privileged interactive users\' home directories does not exist, this is a finding.
Cozum: Migrate the "/home" directory onto a separate file system/partition.

Kural_ID: SV-86685r1_rule
Onem: low
Kural_Basligi: The system must use a separate file system for /var.
Aciklama: The use of separate file systems for different paths can protect the system from failures resulting from a file system becoming full or failing.
Aranacak_icerik: Verify that a separate file system/partition has been created for "/var".\n\nCheck that a file system/partition has been created for "/var" with the following command:\n\n# grep /var /etc/fstab\nUUID=c274f65f    /var                    ext4    noatime,nobarrier        1 2\n\nIf a separate entry for "/var" is not in use, this is a finding.
Cozum: Migrate the "/var" path onto a separate file system.

Kural_ID: SV-86689r1_rule
Onem: low
Kural_Basligi: The system must use a separate file system for /tmp (or equivalent).
Aciklama: The use of separate file systems for different paths can protect the system from failures resulting from a file system becoming full or failing.
Aranacak_icerik: Verify that a separate file system/partition has been created for "/tmp".\n\nCheck that a file system/partition has been created for "/tmp" with the following command:\n\n# systemctl is-enabled tmp.mount\nenabled\n\nIf the "tmp.mount" service is not enabled, this is a finding.
Cozum: Start the "tmp.mount" service with the following command:\n\n# systemctl enable tmp.mount

Kural_ID: SV-86693r2_rule
Onem: low
Kural_Basligi: The file integrity tool must be configured to verify Access Control Lists (ACLs).
Aciklama: ACLs can provide permissions beyond those permitted through the file mode and must be verified by file integrity tools.
Aranacak_icerik: Verify the file integrity tool is configured to verify ACLs.\n\nCheck to see if Advanced Intrusion Detection Environment (AIDE) is installed on the system with the following command:\n\n# dpkg -s aide\n\nIf AIDE is not installed, ask the System Administrator how file integrity checks are performed on the system. \n\nIf there is no application installed to perform file integrity checks, this is a finding.\n\nNote: AIDE is highly configurable at install time. These commands assume the "aide.conf" file is under the "/etc" directory. \n\nUse the following command to determine if the file is in another location:\n\n# find / -name aide.conf\n\nCheck the "aide.conf" file to determine if the "acl" rule has been added to the rule list being applied to the files and directories selection lists.\n\nAn example rule that includes the "acl" rule is below:\n\nAll= p+i+n+u+g+s+m+S+sha512+acl+xattrs+selinux\n/bin All            # apply the custom rule to the files in bin \n/sbin All          # apply the same custom rule to the files in sbin \n\nIf the "acl" rule is not being used on all selection lines in the "/etc/aide.conf" file, or ACLs are not being checked by another file integrity tool, this is a finding.
Cozum: Configure the file integrity tool to check file and directory ACLs. \n\nIf AIDE is installed, ensure the "acl" rule is present on all file and directory selection lists.

Kural_ID: SV-86697r2_rule
Onem: medium
Kural_Basligi: The file integrity tool must use FIPS 140-2 approved cryptographic hashes for validating file contents and directories.
Aciklama: File integrity tools use cryptographic hashes for verifying file contents and directories have not been altered. These hashes must be FIPS 140-2 approved cryptographic hashes.
Aranacak_icerik: Verify the file integrity tool is configured to use FIPS 140-2 approved cryptographic hashes for validating file contents and directories.\n\nNote: If RHEL-07-021350 is a finding, this is automatically a finding as the system cannot implement FIPS 140-2 approved cryptographic algorithms and hashes.\n\nCheck to see if Advanced Intrusion Detection Environment (AIDE) is installed on the system with the following command:\n\n# dpkg -s aide\n\nIf AIDE is not installed, ask the System Administrator how file integrity checks are performed on the system. \n\nIf there is no application installed to perform file integrity checks, this is a finding.\n\nNote: AIDE is highly configurable at install time. These commands assume the "aide.conf" file is under the "/etc" directory. \n\nUse the following command to determine if the file is in another location:\n\n# find / -name aide.conf\n\nCheck the "aide.conf" file to determine if the "sha512" rule has been added to the rule list being applied to the files and directories selection lists.\n\nAn example rule that includes the "sha512" rule follows:\n\nAll=p+i+n+u+g+s+m+S+sha512+acl+xattrs+selinux\n/bin All            # apply the custom rule to the files in bin \n/sbin All          # apply the same custom rule to the files in sbin \n\nIf the "sha512" rule is not being used on all selection lines in the "/etc/aide.conf" file, or another file integrity tool is not using FIPS 140-2 approved cryptographic hashes for validating file contents and directories, this is a finding.
Cozum: Configure the file integrity tool to use FIPS 140-2 cryptographic hashes for validating file and directory contents. \n\nIf AIDE is installed, ensure the "sha512" rule is present on all file and directory selection lists.

Kural_ID: SV-86699r1_rule
Onem: medium
Kural_Basligi: The system must not allow removable media to be used as the boot loader unless approved.
Aciklama: Malicious users with removable boot media can gain access to a system configured to use removable media as the boot loader. If removable media is designed to be used as the boot loader, the requirement must be documented with the Information System Security Officer (ISSO).
Aranacak_icerik: [u'Verify the system is not configured to use a boot loader on removable media.\n\nNote: GRUB 2 reads its configuration from the "/boot/grub2/grub.cfg" file on traditional BIOS-based machines and from the "/boot/efi/EFI/redhat/grub.cfg" file on UEFI machines.\n\nCheck for the existence of alternate boot loader configuration files with the following command:\n\n# find / -name grub.cfg\n/boot/grub2/grub.cfg\n\nIf a "grub.cfg" is found in any subdirectories other than "/boot/grub2" and "/boot/efi/EFI/redhat", ask the System Administrator if there is documentation signed by the ISSO to approve the use of removable media as a boot loader. \n\nCheck that the grub configuration file has the set root command in each menu entry with the following commands:\n\n# grep -c menuentry /boot/grub2/grub.cfg\n1\n# grep \u2018set root\u2019 /boot/grub2/grub.cfg\nset root=(hd0,1)\n\nIf the system is using an alternate boot loader on removable media, and documentation does not exist approving the alternate configuration, this is a finding.
Cozum: Remove alternate methods of booting the system from removable media or document the configuration to boot from removable media with the ISSO.

Kural_ID: SV-86701r1_rule
Onem: high
Kural_Basligi: The telnet-server package must not be installed.
Aciklama: It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors.\n\nOperating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions).\n\nExamples of non-essential capabilities include, but are not limited to, games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission, but which cannot be disabled.
Aranacak_icerik: Verify the operating system is configured to disable non-essential capabilities. The most secure way of ensuring a non-essential capability is disabled is to not have the capability installed.\n\nThe telnet service provides an unencrypted remote access service that does not provide for the confidentiality and integrity of user passwords or the remote session.\n\nIf a privileged user were to log on using this service, the privileged user password could be compromised. \n\nCheck to see if the telnet-server package is installed with the following command:\n\n# dpkg -s telnetd\n\nIf the telnet-server package is installed, this is a finding.
Cozum: Configure the operating system to disable non-essential capabilities by removing the telnet-server package from the system with the following command:\n\n# apt-get remove telnetd

Kural_ID: SV-86703r1_rule
Onem: high
Kural_Basligi: Auditing must be configured to produce records containing information to establish what type of events occurred, where the events occurred, the source of the events, and the outcome of the events.
These audit records must also identify individual identities of group account users.
Aciklama: Without establishing what type of events occurred, it would be difficult to establish, correlate, and investigate the events leading up to an outage or attack.\n\nAudit record content that may be necessary to satisfy this requirement includes, for example, time stamps, source and destination addresses, user/process identifiers, event descriptions, success/fail indications, filenames involved, and access control or flow control rules invoked.\n\nAssociating event types with detected events in the operating system audit logs provides a means of investigating an attack; recognizing resource utilization or capacity thresholds; or identifying an improperly configured operating system.\n\n
Aranacak_icerik: Verify the operating system produces audit records containing information to establish when (date and time) the events occurred.\n\nCheck to see if auditing is active by issuing the following command:\n\n# service auditd status | grep "Active:.active.(running)" \nActive: active (running) since Tue 2015-01-27 19:41:23 EST; 22h ago\n\nIf the "auditd" status is not active, this is a finding.
Cozum: Configure the operating system to produce audit records containing information to establish when (date and time) the events occurred.\n\nEnable the auditd service with the following command:\n\n# service auditd start

Kural_ID: SV-86705r1_rule
Onem: medium
Kural_Basligi: The operating system must shut down upon audit processing failure, unless availability is an overriding concern. If availability is a concern, the system must alert the designated staff (System Administrator [SA] and Information System Security Officer [ISSO] at a minimum) in the event of an audit processing failure.
Aciklama: It is critical for the appropriate personnel to be aware if a system is at risk of failing to process audit logs as required. Without this notification, the security personnel may be unaware of an impending failure of the audit capability, and system operation may be adversely affected.\n\nAudit processing failures include software/hardware errors, failures in the audit capturing mechanisms, and audit storage capacity being reached or exceeded.\n\nThis requirement applies to each audit data storage repository (i.e., distinct information system component where audit records are stored), the centralized audit storage capacity of organizations (i.e., all audit data storage repositories combined), or both.\n\n
Aranacak_icerik: Confirm the audit configuration regarding how auditing processing failures are handled.\n\nCheck to see what level "auditctl" is set to with following command: \n\n# auditctl -l | grep /-f\n -f 2\n\nIf the value of "-f" is set to "2", the system is configured to panic (shut down) in the event of an auditing failure.\n\nIf the value of "-f" is set to "1", the system is configured to only send information to the kernel log regarding the failure.\n\nIf the "-f" flag is not set, this is a CAT I finding.\n\nIf the "-f" flag is set to any value other than "1" or "2", this is a CAT II finding.\n\nIf the "-f" flag is set to "1" but the availability concern is not documented or there is no monitoring of the kernel log, this is a CAT III finding.
Cozum: Configure the operating system to shut down in the event of an audit processing failure.\n\nAdd or correct the option to shut down the operating system with the following command:\n\n# auditctl -f 2\n\nIf availability has been determined to be more important, and this decision is documented with the ISSO, configure the operating system to notify system administration staff and ISSO staff in the event of an audit processing failure with the following command:\n\n# auditctl -f 1\n\nKernel log monitoring must also be configured to properly alert designated staff.\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86707r1_rule
Onem: medium
Kural_Basligi: The operating system must off-load audit records onto a different system or media from the system being audited.
Aciklama: Information stored in one location is vulnerable to accidental or incidental deletion or alteration.\n\nOff-loading is a common process in information systems with limited audit storage capacity.\n\n
Aranacak_icerik: Verify the operating system off-loads audit records onto a different system or media from the system being audited.\n\nTo determine the remote server that the records are being sent to, use the following command:\n\n# grep -i remote_server /etc/audisp/audisp-remote.conf\nremote_server = 10.0.21.1\n\nIf a remote server is not configured, or the line is commented out, ask the System Administrator to indicate how the audit logs are off-loaded to a different system or media. \n\nIf there is no evidence that the audit logs are being off-loaded to another system or media, this is a finding.
Cozum: Configure the operating system to off-load audit records onto a different system or media from the system being audited.\n\nSet the remote server option in "/etc/audisp/audisp-remote.conf" with the IP address of the log aggregation server.

Kural_ID: SV-86709r1_rule
Onem: medium
Kural_Basligi: The operating system must encrypt the transfer of audit records off-loaded onto a different system or media from the system being audited.
Aciklama: Information stored in one location is vulnerable to accidental or incidental deletion or alteration.\n\nOff-loading is a common process in information systems with limited audit storage capacity.\n\n
Aranacak_icerik: Verify the operating system encrypts audit records off-loaded onto a different system or media from the system being audited.\n\nTo determine if the transfer is encrypted, use the following command:\n\n# grep -i enable_krb5 /etc/audisp/audisp-remote.conf\nenable_krb5 = yes\n\nIf the value of the "enable_krb5" option is not set to "yes" or the line is commented out, ask the System Administrator to indicate how the audit logs are off-loaded to a different system or media. \n\nIf there is no evidence that the transfer of the audit logs being off-loaded to another system or media is encrypted, this is a finding.
Cozum: Configure the operating system to encrypt the transfer of off-loaded audit records onto a different system or media from the system being audited.\n\nUncomment the "enable_krb5" option in "/etc/audisp/audisp-remote.conf" and set it with the following line:\n\nenable_krb5 = yes

Kural_ID: SV-86711r2_rule
Onem: medium
Kural_Basligi: The audit system must take appropriate action when the audit storage volume is full.
Aciklama: Taking appropriate action in case of a filled audit storage volume will minimize the possibility of losing audit records.
Aranacak_icerik: Verify the action the operating system takes if the disk the audit records are written to becomes full.\n\nTo determine the action that takes place if the disk is full on the remote server, use the following command:\n\n# grep -i disk_full_action /etc/audisp/audisp-remote.conf\ndisk_full_action = single\n\nTo determine the action that takes place if the network connection fails, use the following command:\n\n# grep -i network_failure_action /etc/audisp/audisp-remote.conf\nnetwork_failure_action = stop\n\nIf the value of the "network_failure_action" option is not "syslog", "single", or "halt", or the line is commented out, this is a finding.\n\nIf the value of the "disk_full_action" option is not "syslog", "single", or "halt", or the line is commented out, this is a finding.
Cozum: Configure the action the operating system takes if the disk the audit records are written to becomes full.\n\nUncomment or edit the "disk_full_action" option in "/etc/audisp/audisp-remote.conf" and set it to "syslog", "single", or "halt", such as the following line:\n\ndisk_full_action = single\n\nUncomment the "network_failure_action" option in "/etc/audisp/audisp-remote.conf" and set it to "syslog", "single", or "halt".

Kural_ID: SV-86713r1_rule
Onem: medium
Kural_Basligi: The operating system must immediately notify the System Administrator (SA) and Information System Security Officer ISSO (at a minimum) when allocated audit record storage volume reaches 75% of the repository maximum audit record storage capacity.
Aciklama: If security personnel are not notified immediately when storage volume reaches 75 percent utilization, they are unable to plan for audit record storage capacity expansion.
Aranacak_icerik: Verify the operating system immediately notifies the SA and ISSO (at a minimum) when allocated audit record storage volume reaches 75 percent of the repository maximum audit record storage capacity.\n\nCheck the system configuration to determine the partition the audit records are being written to with the following command:\n\n# grep log_file /etc/audit/auditd.conf\nlog_file = /var/log/audit/audit.log\n\nCheck the size of the partition that audit records are written to (with the example being "/var/log/audit/"):\n\n# df -h /var/log/audit/\n0.9G /var/log/audit\n\nIf the audit records are not being written to a partition specifically created for audit records (in this example "/var/log/audit" is a separate partition), determine the amount of space other files in the partition are currently occupying with the following command:\n\n# du -sh <partition>\n1.8G /var\n\nDetermine what the threshold is for the system to take action when 75 percent of the repository maximum audit record storage capacity is reached:\n\n# grep -i space_left /etc/audit/auditd.conf\nspace_left = 225 \n\nIf the value of the "space_left" keyword is not set to 25 percent of the total partition size, this is a finding.
Cozum: Configure the operating system to immediately notify the SA and ISSO (at a minimum) when allocated audit record storage volume reaches 75 percent of the repository maximum audit record storage capacity.\n\nCheck the system configuration to determine the partition the audit records are being written to: \n\n# grep log_file /etc/audit/auditd.conf\n\nDetermine the size of the partition that audit records are written to (with the example being "/var/log/audit/"):\n\n# df -h /var/log/audit/\n\nSet the value of the "space_left" keyword in "/etc/audit/auditd.conf" to 75 percent of the partition size.

Kural_ID: SV-86715r1_rule
Onem: medium
Kural_Basligi: The operating system must immediately notify the System Administrator (SA) and Information System Security Officer (ISSO) (at a minimum) via email when the threshold for the repository maximum audit record storage capacity is reached.
Aciklama: If security personnel are not notified immediately when the threshold for the repository maximum audit record storage capacity is reached, they are unable to expand the audit record storage capacity before records are lost.
Aranacak_icerik: Verify the operating system immediately notifies the SA and ISSO (at a minimum) via email when the allocated audit record storage volume reaches 75 percent of the repository maximum audit record storage capacity.\n\nCheck what action the operating system takes when the threshold for the repository maximum audit record storage capacity is reached with the following command:\n\n# grep -i space_left_action  /etc/audit/auditd.conf\nspace_left_action = email\n\nIf the value of the "space_left_action" keyword is not set to "email", this is a finding.
Cozum: Configure the operating system to immediately notify the SA and ISSO (at a minimum) when the threshold for the repository maximum audit record storage capacity is reached.\n\nUncomment or edit the "space_left_action" keyword in "/etc/audit/auditd.conf" and set it to "email". \n \nspace_left_action = email

Kural_ID: SV-86717r2_rule
Onem: medium
Kural_Basligi: The operating system must immediately notify the System Administrator (SA) and Information System Security Officer (ISSO) (at a minimum) when the threshold for the repository maximum audit record storage capacity is reached.
Aciklama: If security personnel are not notified immediately when the threshold for the repository maximum audit record storage capacity is reached, they are unable to expand the audit record storage capacity before records are lost.
Aranacak_icerik: Verify the operating system immediately notifies the SA and ISSO (at a minimum) via email when the threshold for the repository maximum audit record storage capacity is reached.\n\nCheck what account the operating system emails when the threshold for the repository maximum audit record storage capacity is reached with the following command:\n\n# grep -i action_mail_acct  /etc/audit/auditd.conf\naction_mail_acct = root\n\nIf the value of the "action_mail_acct" keyword is not set to "root" and other accounts for security personnel, this is a finding.
Cozum: Configure the operating system to immediately notify the SA and ISSO (at a minimum) when the threshold for the repository maximum audit record storage capacity is reached.\n\nUncomment or edit the "action_mail_acct" keyword in "/etc/audit/auditd.conf" and set it to root and any other accounts associated with security personnel. \n \naction_mail_acct = root

Kural_ID: SV-86721r2_rule
Onem: medium
Kural_Basligi: All uses of the chown command must be audited.
Aciklama: Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "chown" command occur.\n\nCheck the file system rules in "/etc/audit/audit.rules" with the following commands:\n\nNote: The output lines of the command are duplicated to cover both 32-bit and 64-bit architectures. Only the lines appropriate for the system architecture must be present.\n\n# grep -i chown /etc/audit/audit.rules\n\n-a always,exit -F arch=b32 -S chown -F auid>=1000 -F auid!=4294967295 -k perm_mod\n\n-a always,exit -F arch=b64 -S chown -F auid>=1000 -F auid!=4294967295 -k perm_mod\n\nIf the command does not return any output, this is a finding.
Cozum: Add or update the following rule in "/etc/audit/rules.d/audit.rules" (removing those that do not match the CPU architecture):\n\n-a always,exit -F arch=b32 -S chown -F auid>=1000 -F auid!=4294967295 -k perm_mod\n\n-a always,exit -F arch=b64 -S chown -F auid>=1000 -F auid!=4294967295 -k perm_mod\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86723r2_rule
Onem: medium
Kural_Basligi: All uses of the fchown command must be audited.
Aciklama: Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "fchown" command occur.\n\nCheck the file system rules in "/etc/audit/audit.rules" with the following commands:\n\nNote: The output lines of the command are duplicated to cover both 32-bit and 64-bit architectures. Only the lines appropriate for the system architecture must be present.\n\n# grep -i fchown /etc/audit/audit.rules\n\n-a always,exit -F arch=b32 -S fchown -F auid>=1000 -F auid!=4294967295 -k perm_mod\n\n-a always,exit -F arch=b64 -S fchown -F auid>=1000 -F auid!=4294967295 -k perm_mod\n\nIf the command does not return any output, this is a finding.
Cozum: Add or update the following rule in "/etc/audit/rules.d/audit.rules" (removing those that do not match the CPU architecture):\n\n-a always,exit -F arch=b32 -S fchown -F auid>=1000 -F auid!=4294967295 -k perm_mod\n\n-a always,exit -F arch=b64 -S fchown -F auid>=1000 -F auid!=4294967295 -k perm_mod\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86729r2_rule
Onem: medium
Kural_Basligi: All uses of the chmod command must be audited.
Aciklama: Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "chmod" command occur.\n\nCheck the file system rules in "/etc/audit/audit.rules" with the following command:\n\nNote: The output lines of the command are duplicated to cover both 32-bit and 64-bit architectures. Only the lines appropriate for the system architecture must be present.\n\n# grep -i chmod /etc/audit/audit.rules\n\n-a always,exit -F arch=b32 -S chmod -F auid>=1000 -F auid!=4294967295 -k perm_mod\n\n-a always,exit -F arch=b64 -S chmod -F auid>=1000 -F auid!=4294967295 -k perm_mod\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "chmod" command occur.\n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules" (removing those that do not match the CPU architecture):\n\n-a always,exit -F arch=b32 -S chmod -F auid>=1000 -F auid!=4294967295 -k perm_mod\n\n-a always,exit -F arch=b64 -S chmod -F auid>=1000 -F auid!=4294967295 -k perm_mod\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86749r2_rule
Onem: medium
Kural_Basligi: All uses of the open command must be audited.
Aciklama: Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "open" command occur.\n\nCheck the file system rules in "/etc/audit/audit.rules" with the following commands:\n\nNote: The output lines of the command are duplicated to cover both 32-bit and 64-bit architectures. Only the lines appropriate for the system architecture must be present.\n\n# grep -i open /etc/audit/audit.rules\n\n-a always,exit -F arch=b32 -S open -Fexit=-EPERM -F auid>=1000 -F auid!=4294967295 -k access\n\n-a always,exit -F arch=b64 -S open -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k access\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "open" command occur.\n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules" (removing those that do not match the CPU architecture):\n\n-a always,exit -F arch=b32 -S open -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -k access\n\n-a always,exit -F arch=b64 -S open -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k access\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86755r2_rule
Onem: medium
Kural_Basligi: All uses of the truncate command must be audited.
Aciklama: Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "truncate" command occur.\n\nCheck the file system rules in "/etc/audit/audit.rules" with the following commands:\n\nNote: The output lines of the command are duplicated to cover both 32-bit and 64-bit architectures. Only the lines appropriate for the system architecture must be present.\n\n# grep -i truncate /etc/audit/audit.rules\n\n-a always,exit -F arch=b32 -S truncate -Fexit=-EPERM -F auid>=1000 -F auid!=4294967295 -k access\n\n-a always,exit -F arch=b64 -S truncate -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k access\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "truncate" command occur.\n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules" (removing those that do not match the CPU architecture):\n\n-a always,exit -F arch=b32 -S truncate -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -k access\n\n-a always,exit -F arch=b64 -S truncate -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k access\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86767r2_rule
Onem: medium
Kural_Basligi: The operating system must generate audit records for all successful/unsuccessful account access count events.
Aciklama: Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful account access count events occur. \n\nCheck the file system rule in "/etc/audit/audit.rules" with the following commands: \n\n# grep -i /var/log/tallylog /etc/audit/audit.rules\n\n-w /var/log/tallylog -p wa -k logins\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful account access count events occur.\n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules": \n\n-w /var/log/tallylog -p wa -k logins\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86769r2_rule
Onem: medium
Kural_Basligi: The operating system must generate audit records for all unsuccessful account access events.
Aciklama: Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\n
Aranacak_icerik: Verify the operating system generates audit records when unsuccessful account access events occur. \n\nCheck the file system rule in "/etc/audit/audit.rules" with the following commands: \n\n# grep -i /var/run/faillock /etc/audit/audit.rules\n\n-w /var/run/faillock -p wa -k logins\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when unsuccessful account access events occur. \n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules": \n\n-w /var/run/faillock/ -p wa -k logins\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86771r2_rule
Onem: medium
Kural_Basligi: The operating system must generate audit records for all successful account access events.
Aciklama: Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful account access events occur. \n\nCheck the file system rules in "/etc/audit/audit.rules" with the following commands: \n\n# grep -i /var/log/lastlog /etc/audit/audit.rules\n\n-w /var/log/lastlog -p wa -k logins \n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful account access events occur. \n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules": \n\n-w /var/log/lastlog -p wa -k logins\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86773r3_rule
Onem: medium
Kural_Basligi: All uses of the passwd command must be audited.
Aciklama: Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged password commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "passwd" command occur.\n\nCheck the file system rule in "/etc/audit/audit.rules" with the following command:\n\n# grep -i /usr/bin/passwd /etc/audit/audit.rules\n\n-a always,exit -F path=/usr/bin/passwd -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-passwd\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "passwd" command occur.\n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules":\n\n-a always,exit -F path=/usr/bin/passwd -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-passwd\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86775r3_rule
Onem: medium
Kural_Basligi: All uses of the unix_chkpwd command must be audited.
Aciklama: Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged password commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "unix_chkpwd" command occur.\n\nCheck the file system rule in "/etc/audit/audit.rules" with the following command:\n\n# grep -i /sbin/unix_chkpwd /etc/audit/audit.rules\n\n-a always,exit -F path=/sbin/unix_chkpwd -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-passwd\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "unix_chkpwd" command occur.\n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules":\n\n-a always,exit -F path=/sbin/unix_chkpwd -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-passwd\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86777r3_rule
Onem: medium
Kural_Basligi: All uses of the gpasswd command must be audited.
Aciklama: Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged password commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "gpasswd" command occur.\n\nCheck the file system rule in "/etc/audit/audit.rules" with the following command:\n\n# grep -i /usr/bin/gpasswd /etc/audit/audit.rules\n\n-a always,exit -F path=/usr/bin/gpasswd -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-passwd\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "gpasswd" command occur.\n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules":\n\n-a always,exit -F path=/usr/bin/gpasswd -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-passwd\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86779r3_rule
Onem: medium
Kural_Basligi: All uses of the chage command must be audited.
Aciklama: Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged password commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "chage" command occur.\n\nCheck the file system rule in "/etc/audit/audit.rules" with the following command:\n\n# grep -i /usr/bin/chage /etc/audit/audit.rules\n\n-a always,exit -F path=/usr/bin/chage -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-passwd\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "chage" command occur.\n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules":\n\n-a always,exit -F path=/usr/bin/chage -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-passwd\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86781r3_rule
Onem: medium
Kural_Basligi: All uses of the userhelper command must be audited.
Aciklama: Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged password commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "gnome-pty-helper" command occur.\n\nCheck the file system rule in "/etc/audit/audit.rules" with the following command:\n\n# auditctl -l | grep gnome-pty-helper \n\n-a always,exit -F path=/usr/lib/libvte-2.90-9/gnome-pty-helper -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-passwd\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "gnome-pty-helper" command occur.\n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules":\n\n-a always,exit -F path=/usr/lib/libvte-2.90-9/gnome-pty-helper -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-passwd\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86783r3_rule
Onem: medium
Kural_Basligi: All uses of the su command must be audited.
Aciklama: Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged access commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "su" command occur.\n\nCheck for the following system call being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": \n\n# grep -i /bin/su /etc/audit/audit.rules\n\n-a always,exit -F path=/bin/su -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-priv_change\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "su" command occur.\n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules": \n\n-a always,exit -F path=/bin/su -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-priv_change \n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86785r3_rule
Onem: medium
Kural_Basligi: All uses of the sudo command must be audited.
Aciklama: Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged access commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "sudo" command occur.\n\nCheck for the following system calls being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": \n\n# grep -i /usr/bin/sudo /etc/audit/audit.rules\n\n-a always,exit -F path=/usr/bin/sudo -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-priv_change\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "sudo" command occur.\n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules": \n\n-a always,exit -F path=/usr/bin/sudo -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-priv_change \n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86787r3_rule
Onem: medium
Kural_Basligi: All uses of the sudoers command must be audited.
Aciklama: Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged access commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "sudoer" command occur.\n\nCheck for modification of the following files being audited by performing the following commands to check the file system rules in "/etc/audit/audit.rules": \n\n# grep /etc/sudoers /etc/audit/audit.rules\n\n-w /etc/sudoers -p wa -k privileged-actions\n\n# grep /etc/sudoers.d /etc/audit/audit.rules\n\n-w /etc/sudoers.d -p wa -k privileged-actions\n\nIf the commands do not return output that does not match the examples, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "sudoer" command occur.\n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules":\n\n-w /etc/sudoers -p wa -k privileged-actions\n\n-w /etc/sudoers.d -p wa -k privileged-actions\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86789r3_rule
Onem: medium
Kural_Basligi: All uses of the newgrp command must be audited.
Aciklama: Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged access commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "newgrp" command occur.\n\nCheck for the following system call being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": \n\n# grep -i /usr/bin/newgrp /etc/audit/audit.rules\n\n-a always,exit -F path=/usr/bin/newgrp -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-priv_change\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "newgrp" command occur.\n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules": \n\n-a always,exit -F path=/usr/bin/newgrp -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-priv_change\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86791r3_rule
Onem: medium
Kural_Basligi: All uses of the chsh command must be audited.
Aciklama: Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged access commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "chsh" command occur.\n\nCheck for the following system call being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": \n\n# grep -i /usr/bin/chsh /etc/audit/audit.rules\n\n-a always,exit -F path=/usr/bin/chsh -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-priv_change\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "chsh" command occur.\n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules": \n\n-a always,exit -F path=/usr/bin/chsh -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-priv_change\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86793r3_rule
Onem: medium
Kural_Basligi: All uses of the sudoedit command must be audited.
Aciklama: Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged access commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "sudoedit" command occur.\n\nCheck for the following system calls being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": \n\n# grep -i /usr/bin/sudoedit /etc/audit/audit.rules\n\n-a always,exit -F path=/bin/sudoedit -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-priv_change\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "sudoedit" command occur.\n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules": \n\n-a always,exit -F path=/bin/sudoedit -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-priv_change\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86795r3_rule
Onem: medium
Kural_Basligi: All uses of the mount command must be audited.
Aciklama: Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged mount commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "mount" command occur.\n\nCheck for the following system calls being audited by performing the following series of commands to check the file system rules in "/etc/audit/audit.rules": \n\n# grep -i /bin/mount /etc/audit/audit.rules\n\n-a always,exit -F arch=b32 -S mount -F auid>=1000 -F auid!=4294967295 -k privileged-mount\n\n-a always,exit -F arch=b64 -S mount -F auid>=1000 -F auid!=4294967295 -k privileged-mount\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "mount" command occur.\n\nAdd or update the following rules in "/etc/audit/rules.d/audit.rules" (removing those that do not match the CPU architecture):\n\n-a always,exit -F arch=b32 -S mount -F auid>=1000 -F auid!=4294967295 -k privileged-mount\n\n-a always,exit -F arch=b64 -S mount -F auid>=1000 -F auid!=4294967295 -k privileged-mount\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86797r3_rule
Onem: medium
Kural_Basligi: All uses of the umount command must be audited.
Aciklama: Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged mount commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "umount" command occur.\n\nCheck for the following system calls being audited by performing the following series of commands to check the file system rules in "/etc/audit/audit.rules": \n\n# grep -i /bin/umount /etc/audit/audit.rules\n\n-a always,exit -F path=/bin/umount -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-mount  \n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "umount" command occur.\n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules": \n\n-a always,exit -F path=/bin/umount -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-mount\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86799r3_rule
Onem: medium
Kural_Basligi: All uses of the postdrop command must be audited.
Aciklama: Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged postfix commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "postdrop" command occur.\n\nCheck for the following system call being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": \n\n# grep -i /usr/sbin/postdrop /etc/audit/audit.rules\n\n-a always,exit -F path=/usr/sbin/postdrop -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-postfix\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "postdrop" command occur.\n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules": \n\n-a always,exit -F path=/usr/sbin/postdrop -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-postfix\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86803r2_rule
Onem: medium
Kural_Basligi: All uses of the ssh-keysign command must be audited.
Aciklama: Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged ssh commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "ssh-keysign" command occur. \n\nCheck for the following system call being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": \n\n# grep -i /usr/libexec/openssh/ssh-keysign /etc/audit/audit.rules\n\n-a always,exit -F path=/usr/libexec/openssh/ssh-keysign -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-ssh\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "ssh-keysign" command occur. \n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules": \n\n-a always,exit -F path=/usr/libexec/openssh/ssh-keysign -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-ssh\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86807r2_rule
Onem: medium
Kural_Basligi: All uses of the crontab command must be audited.
Aciklama: Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "crontab" command occur. \n\nCheck for the following system call being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": \n\n# grep -i /usr/bin/crontab /etc/audit/audit.rules\n\n-a always,exit -F path=/usr/bin/crontab -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-cron\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "crontab" command occur. \n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules": \n\n-a always,exit -F path=/usr/bin/crontab -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-cron\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86809r2_rule
Onem: medium
Kural_Basligi: All uses of the pam_timestamp_check command must be audited.
Aciklama: Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "pam_timestamp_check" command occur. \n\nCheck the auditing rules in "/etc/audit/audit.rules" with the following command:\n\n# grep -i /usr/sbin/pam_timestamp_check /etc/audit/audit.rules\n\n-a always,exit -F path=/usr/sbin/pam_timestamp_check -F perm=x -F auid>=1000 -F auid!=4294967295  -k privileged-pam  \n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "pam_timestamp_check" command occur. \n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules": \n\n-a always,exit -F path=/usr/sbin/pam_timestamp_check -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-pam\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86811r2_rule
Onem: medium
Kural_Basligi: All uses of the init_module command must be audited.
Aciklama: Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. \n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "init_module" command occur. \n\nCheck the auditing rules in "/etc/audit/audit.rules" with the following command:\n\nNote: The output lines of the command are duplicated to cover both 32-bit and 64-bit architectures. Only the line appropriate for the system architecture must be present.\n\n# grep -i init_module /etc/audit/audit.rules\n\nIf the command does not return the following output (appropriate to the architecture), this is a finding. \n\n-a always,exit -F arch=b32 -S init_module -k module-change\n\n-a always,exit -F arch=b64 -S init_module -k module-change\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system generates audit records when successful/unsuccessful attempts to use the "init_module" command occur. \n\nAdd or update the following rules in "/etc/audit/rules.d/audit.rules" (removing those that do not match the CPU architecture): \n\n-a always,exit -F arch=b32 -S init_module -k module-change\n\n-a always,exit -F arch=b64 -S init_module -k module-change\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86813r2_rule
Onem: medium
Kural_Basligi: All uses of the delete_module command must be audited.
Aciklama: Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. \n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "delete_module" command occur. \n\nCheck the auditing rules in "/etc/audit/audit.rules" with the following command:\n\nNote: The output lines of the command are duplicated to cover both 32-bit and 64-bit architectures. Only the line appropriate for the system architecture must be present.\n\n# grep -i delete_module /etc/audit/audit.rules\n\nIf the command does not return the following output (appropriate to the architecture), this is a finding. \n\n-a always,exit -F arch=b32 -S delete_module -k module-change\n\n-a always,exit -F arch=b64 -S delete_module -k module-change\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "delete_module" command occur. \n\nAdd or update the following rules in "/etc/audit/rules.d/audit.rules" (removing those that do not match the CPU architecture): \n\n-a always,exit -F arch=b32 -S delete_module -k module-change\n\n-a always,exit -F arch=b64 -S delete_module -k module-change\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86815r2_rule
Onem: medium
Kural_Basligi: All uses of the insmod command must be audited.
Aciklama: Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. \n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "insmod" command occur. \n\nCheck the auditing rules in "/etc/audit/audit.rules" with the following command:\n\n# grep -i insmod /etc/audit/audit.rules\n\nIf the command does not return the following output (appropriate to the architecture), this is a finding. \n\n-w /sbin/insmod -p x -F auid!=4294967295 -k module-change\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "insmod" command occur. \n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules" (removing those that do not match the CPU architecture): \n\n-w /sbin/insmod -p x -F auid!=4294967295 -k module-change\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86817r2_rule
Onem: medium
Kural_Basligi: All uses of the rmmod command must be audited.
Aciklama: Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. \n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "rmmod" command occur. \n\nCheck the auditing rules in "/etc/audit/audit.rules" with the following command:\n\n# grep -i rmmod /etc/audit/audit.rules\n\nIf the command does not return the following output (appropriate to the architecture), this is a finding. \n\n-w /sbin/rmmod -p x -F auid!=4294967295 -k module-change\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "rmmod" command occur. \n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules" (removing those that do not match the CPU architecture): \n\n-w /sbin/rmmod -p x -F auid!=4294967295 -k module-change\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86819r2_rule
Onem: medium
Kural_Basligi: All uses of the modprobe command must be audited.
Aciklama: Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. \n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "modprobe" command occur. \n\nCheck the auditing rules in "/etc/audit/audit.rules" with the following command:\n\nNote: The output lines of the command are duplicated to cover both 32-bit and 64-bit architectures. Only the line appropriate for the system architecture must be present.\n\n# grep -i modprobe /etc/audit/audit.rules\n\nIf the command does not return the following output (appropriate to the architecture), this is a finding. \n\n-w /sbin/modprobe -p x -F auid!=4294967295 -k module-change\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "modprobe" command occur. \n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules" (removing those that do not match the CPU architecture): \n\n-w /sbin/modprobe -p x -F auid!=4294967295 -k module-change\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86821r3_rule
Onem: medium
Kural_Basligi: The operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/passwd.
Aciklama: Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\n
Aranacak_icerik: Verify the operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect "/etc/passwd".\n\nCheck the auditing rules in "/etc/audit/audit.rules" with the following command:\n\n# grep /etc/passwd /etc/audit/audit.rules\n\n-w /etc/passwd -p wa -k audit_rules_usergroup_modification\n\nIf the command does not return a line, or the line is commented out, this is a finding.
Cozum: Configure the operating system to generate audit records for all account creations, modifications, disabling, and termination events that affect "/etc/passwd".\n\nAdd or update the following rule "/etc/audit/rules.d/audit.rules":\n\n-w /etc/passwd -p wa -k identity\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86823r2_rule
Onem: medium
Kural_Basligi: All uses of the rename command must be audited.
Aciklama: If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise.\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "rename" command occur.\n\nCheck the file system rules in "/etc/audit/audit.rules" with the following commands:\n\nNote: The output lines of the command are duplicated to cover both 32-bit and 64-bit architectures. Only the lines appropriate for the system architecture must be present.\n\n# grep -i rename /etc/audit/audit.rules\n-a always,exit -F arch=b32 -S rename -F perm=x -F auid>=1000 -F auid!=4294967295 -k delete\n-a always,exit -F arch=b64 -S rename -F perm=x -F auid>=1000 -F auid!=4294967295 -k delete\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "rename" command occur.\n\nAdd the following rules in "/etc/audit/rules.d/audit.rules" (removing those that do not match the CPU architecture):\n\n-a always,exit -F arch=b32 -S rename -F perm=x -F auid>=1000 -F auid!=4294967295 -k delete\n-a always,exit -F arch=b64 -S rename -F perm=x -F auid>=1000 -F auid!=4294967295 -k delete\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86825r2_rule
Onem: medium
Kural_Basligi: All uses of the renameat command must be audited.
Aciklama: If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise.\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "renameat" command occur.\n\nCheck the file system rules in "/etc/audit/audit.rules" with the following commands:\n\nNote: The output lines of the command are duplicated to cover both 32-bit and 64-bit architectures. Only the lines appropriate for the system architecture must be present.\n\n# grep -i renameat  /etc/audit/audit.rules\n-a always,exit -F arch=b32 -S renameat  -F perm=x -F auid>=1000 -F auid!=4294967295 -k delete\n-a always,exit -F arch=b64 -S renameat  -F perm=x -F auid>=1000 -F auid!=4294967295 -k delete\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "renameat" command occur.\n\nAdd the following rules in "/etc/audit/rules.d/audit.rules" (removing those that do not match the CPU architecture):\n\n-a always,exit -F arch=b32 -S renameat  -F perm=x -F auid>=1000 -F auid!=4294967295 -k delete\n-a always,exit -F arch=b64 -S renameat  -F perm=x -F auid>=1000 -F auid!=4294967295 -k delete\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86827r2_rule
Onem: medium
Kural_Basligi: All uses of the rmdir command must be audited.
Aciklama: If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise.\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "rmdir" command occur.\n\nCheck the file system rules in "/etc/audit/audit.rules" with the following commands:\n\nNote: The output lines of the command are duplicated to cover both 32-bit and 64-bit architectures. Only the lines appropriate for the system architecture must be present.\n\n# grep -i rmdir /etc/audit/audit.rules\n-a always,exit -F arch=b32 -S rmdir  -F perm=x -F auid>=1000 -F auid!=4294967295 -k delete\n-a always,exit -F arch=b64 -S rmdir  -F perm=x -F auid>=1000 -F auid!=4294967295 -k delete\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "rmdir" command occur.\n\nAdd the following rules in "/etc/audit/rules.d/audit.rules" (removing those that do not match the CPU architecture):\n\n-a always,exit -F arch=b32 -S rmdir  -F perm=x -F auid>=1000 -F auid!=4294967295 -k delete\n-a always,exit -F arch=b64 -S rmdir  -F perm=x -F auid>=1000 -F auid!=4294967295 -k delete\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86829r2_rule
Onem: medium
Kural_Basligi: All uses of the unlink command must be audited.
Aciklama: If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise.\n\n
Aranacak_icerik: Verify the operating system generates audit records when successful/unsuccessful attempts to use the "unlink" command occur.\n\nCheck the file system rules in "/etc/audit/audit.rules" with the following commands:\n\nNote: The output lines of the command are duplicated to cover both 32-bit and 64-bit architectures. Only the lines appropriate for the system architecture must be present.\n\n# grep -i unlink/etc/audit/audit.rules\n-a always,exit -F arch=b32 -S unlink -F perm=x -F auid>=1000 -F auid!=4294967295 -k delete\n-a always,exit -F arch=b64 -S unlink  -F perm=x -F auid>=1000 -F auid!=4294967295 -k delete\n\nIf the command does not return any output, this is a finding.
Cozum: Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "unlink" command occur.\n\nAdd the following rules in "/etc/audit/rules.d/audit.rules" (removing those that do not match the CPU architecture):\n\n-a always,exit -F arch=b32 -S unlink -F perm=x -F auid>=1000 -F auid!=4294967295 -k delete\n-a always,exit -F arch=b64 -S unlink  -F perm=x -F auid>=1000 -F auid!=4294967295 -k delete\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-86833r1_rule
Onem: medium
Kural_Basligi: The system must send rsyslog output to a log aggregation server.
Aciklama: Sending rsyslog output to another system ensures that the logs cannot be removed or modified in the event that the system is compromised or has a hardware failure.
Aranacak_icerik: Verify "rsyslog" is configured to send all messages to a log aggregation server.\n\nCheck the configuration of "rsyslog" with the following command:\n\nNote: If another logging package is used, substitute the utility configuration file for "/etc/rsyslog.conf".\n\n# grep @ /etc/rsyslog.conf\n*.* @@logagg.site.mil\n\nIf there are no lines in the "/etc/rsyslog.conf" file that contain the "@" or "@@" symbol(s), and the lines with the correct symbol(s) to send output to another system do not cover all "rsyslog" output, ask the System Administrator to indicate how the audit logs are off-loaded to a different system or media. \n\nIf there is no evidence that the audit logs are being sent to another system, this is a finding.
Cozum: Modify the "/etc/rsyslog.conf" file to contain a configuration line to send all "rsyslog" output to a log aggregation system:\n\n*.* @@<log aggregation system name>

Kural_ID: SV-86835r1_rule
Onem: medium
Kural_Basligi: The rsyslog daemon must not accept log messages from other servers unless the server is being used for log aggregation.
Aciklama: Unintentionally running a rsyslog server accepting remote messages puts the system at increased risk. Malicious rsyslog messages sent to the server could exploit vulnerabilities in the server software itself, could introduce misleading information in to the system's logs, or could fill the system's storage leading to a Denial of Service.\nIf the system is intended to be a log aggregation server its use must be documented with the ISSO.
Aranacak_icerik: Verify that the system is not accepting "rsyslog" messages from other systems unless it is documented as a log aggregation server.\n\nCheck the configuration of "rsyslog" with the following command:\n\n# grep imtcp /etc/rsyslog.conf\nModLoad imtcp\n\nIf the "imtcp" module is being loaded in the "/etc/rsyslog.conf" file, ask to see the documentation for the system being used for log aggregation.\n\nIf the documentation does not exist, or does not specify the server as a log aggregation system, this is a finding.
Cozum: Modify the "/etc/rsyslog.conf" file to remove the "ModLoad imtcp" configuration line, or document the system as being used for log aggregation.

Kural_ID: SV-86841r1_rule
Onem: low
Kural_Basligi: The operating system must limit the number of concurrent sessions to 10 for all accounts and/or account types.
Aciklama: Operating system management includes the ability to control the number of users and user sessions that utilize an operating system. Limiting the number of allowed users and sessions per user is helpful in reducing the risks related to DoS attacks.\n\nThis requirement addresses concurrent sessions for information system accounts and does not address concurrent sessions by single users via multiple system accounts. The maximum number of concurrent sessions should be defined based on mission needs and the operational environment for each system.
Aranacak_icerik: Verify the operating system limits the number of concurrent sessions to "10" for all accounts and/or account types by issuing the following command:\n\n# grep "maxlogins" /etc/security/limits.conf\n* hard maxlogins 10\n\nThis can be set as a global domain (with the * wildcard) but may be set differently for multiple domains.\n\nIf the "maxlogins" item is missing or the value is not set to "10" or less for all domains that have the "maxlogins" item assigned, this is a finding.
Cozum: Configure the operating system to limit the number of concurrent sessions to "10" for all accounts and/or account types.\n\nAdd the following line to the top of the /etc/security/limits.conf:\n\n* hard maxlogins 10

Kural_ID: SV-86845r2_rule
Onem: medium
Kural_Basligi: A FIPS 140-2 approved cryptographic algorithm must be used for SSH communications.
Aciklama: Unapproved mechanisms that are used for authentication to the cryptographic module are not verified and therefore cannot be relied upon to provide confidentiality or integrity, and DoD data may be compromised.\n\nOperating systems utilizing encryption are required to use FIPS-compliant mechanisms for authenticating to cryptographic modules.\n\nFIPS 140-2 is the current standard for validating that mechanisms used to access cryptographic modules utilize authentication that meets DoD requirements. This allows for Security Levels 1, 2, 3, or 4 for use on a general purpose computing system.\n\n
Aranacak_icerik: Verify the operating system uses mechanisms meeting the requirements of applicable federal laws, Executive orders, directives, policies, regulations, standards, and guidance for authentication to a cryptographic module.\n\nNote: If RHEL-07-021350 is a finding, this is automatically a finding as the system cannot implement FIPS 140-2-approved cryptographic algorithms and hashes.\n\nThe location of the "sshd_config" file may vary if a different daemon is in use.\n\nInspect the "Ciphers" configuration with the following command:\n\n# grep -i ciphers /etc/ssh/sshd_config\nCiphers aes128-ctr,aes192-ctr,aes256-ctr\n\nIf any ciphers other than "aes128-ctr", "aes192-ctr", or "aes256-ctr" are listed, the "Ciphers" keyword is missing, or the retuned line is commented out, this is a finding.
Cozum: Configure SSH to use FIPS 140-2 approved cryptographic algorithms.\n\nAdd the following line (or modify the line to have the required value) to the "/etc/ssh/sshd_config" file (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor).\n\nCiphers aes128-ctr,aes192-ctr,aes256-ctr\n\nThe SSH service must be restarted for changes to take effect.

Kural_ID: SV-86847r2_rule
Onem: medium
Kural_Basligi: All network connections associated with a communication session must be terminated at the end of the session or after 10 minutes of inactivity from the user at a command prompt, except to fulfill documented and validated mission requirements.
Aciklama: Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition, quickly terminating an idle session will also free up resources committed by the managed network element. \n\nTerminating network connections associated with communications sessions includes, for example, de-allocating associated TCP/IP address/port pairs at the operating system level and de-allocating networking assignments at the application level if multiple application sessions are using a single operating system-level network connection. This does not mean that the operating system terminates all sessions or network access; it only ends the inactive session and releases the resources associated with that session.
Aranacak_icerik: Verify the operating system terminates all network connections associated with a communications session at the end of the session or based on inactivity.\n\nCheck the value of the system inactivity timeout with the following command:\n\n# grep -i tmout /etc/bash.bashrc \nTMOUT=600\n\nIf "TMOUT" is not set to "600" or less in "/etc/bash.bashrc", this is a finding.
Cozum: Configure the operating system to terminate all network connections associated with a communications session at the end of the session or after a period of inactivity.\n\nAdd the following line to "/etc/profile" (or modify the line to have the required value):\n\nTMOUT=600\n\nThe SSH service must be restarted for changes to take effect.

Kural_ID: SV-86853r2_rule
Onem: medium
Kural_Basligi: The operating system must implement cryptography to protect the integrity of Lightweight Directory Access Protocol (LDAP) communications.
Aciklama: Without cryptographic integrity protections, information can be altered by unauthorized users without detection.\n\nCryptographic mechanisms used for protecting the integrity of information include, for example, signed hash functions using asymmetric cryptography enabling distribution of the public key to verify the hash information while maintaining the confidentiality of the key used to generate the hash.
Aranacak_icerik: Verify the operating system implements cryptography to protect the integrity of remote LDAP access sessions.\n\nTo determine if LDAP is being used for authentication, use the following command:\n\n# grep -i useldapauth /etc/sysconfig/authconfig\nUSELDAPAUTH=yes\n\nIf USELDAPAUTH=yes, then LDAP is being used. \n\nCheck for the directory containing X.509 certificates for peer authentication with the following command:\n\n# grep -i cacertdir /etc/pam_ldap.conf\ntls_cacertdir /etc/openldap/certs\n\nVerify the directory set with the "tls_cacertdir" option exists.\n\nIf the directory does not exist or the option is commented out, this is a finding.
Cozum: Configure the operating system to implement cryptography to protect the integrity of LDAP remote access sessions.\n\nSet the "tls_cacertdir" option in "/etc/pam_ldap.conf" to point to the directory that will contain the X.509 certificates for peer authentication.\n\nSet the "tls_cacertfile" option in "/etc/pam_ldap.conf" to point to the path for the X.509 certificates used for peer authentication.

Kural_ID: SV-86855r2_rule
Onem: medium
Kural_Basligi: The operating system must implement cryptography to protect the integrity of Lightweight Directory Access Protocol (LDAP) communications.
Aciklama: Without cryptographic integrity protections, information can be altered by unauthorized users without detection.\n\nCryptographic mechanisms used for protecting the integrity of information include, for example, signed hash functions using asymmetric cryptography enabling distribution of the public key to verify the hash information while maintaining the confidentiality of the key used to generate the hash.
Aranacak_icerik: Verify the operating system implements cryptography to protect the integrity of remote ldap access sessions.\n\nTo determine if LDAP is being used for authentication, use the following command:\n\n# grep -i useldapauth /etc/sysconfig/authconfig\nUSELDAPAUTH=yes\n\nIf USELDAPAUTH=yes, then LDAP is being used.\n\nCheck that the path to the X.509 certificate for peer authentication with the following command:\n\n# grep -i cacertfile /etc/pam_ldap.conf\ntls_cacertfile /etc/openldap/ldap-cacert.pem\n\nVerify the "tls_cacertfile" option points to a file that contains the trusted CA certificate.\n\nIf this file does not exist, or the option is commented out or missing, this is a finding.
Cozum: Configure the operating system to implement cryptography to protect the integrity of LDAP remote access sessions.\n\nSet the "tls_cacertfile" option in "/etc/pam_ldap.conf" to point to the path for the X.509 certificates used for peer authentication.

Kural_ID: SV-86857r1_rule
Onem: medium
Kural_Basligi: All networked systems must have SSH installed.
Aciklama: Without protection of the transmitted information, confidentiality and integrity may be compromised because unprotected communications can be intercepted and either read or altered. \n\nThis requirement applies to both internal and external networks and all types of information system components from which information can be transmitted (e.g., servers, mobile devices, notebook computers, printers, copiers, scanners, and facsimile machines). Communication paths outside the physical protection of a controlled boundary are exposed to the possibility of interception and modification. \n\nProtecting the confidentiality and integrity of organizational information can be accomplished by physical means (e.g., employing physical distribution systems) or by logical means (e.g., employing cryptographic techniques). If physical means of protection are employed, logical means (cryptography) do not have to be employed, and vice versa.\n\n
Aranacak_icerik: Check to see if sshd is installed with the following command:\n\n# dpkg -l ssh\nlibssh2.x86_64                           1.4.3-8.el7               @anaconda/7.1\nopenssh.x86_64                           6.6.1p1-11.el7            @anaconda/7.1\nopenssh-clients.x86_64                   6.6.1p1-11.el7            @anaconda/7.1\nopenssh-server.x86_64                    6.6.1p1-11.el7            @anaconda/7.1\n\nIf the "SSH server" package is not installed, this is a finding.\n\nIf the "SSH client" package is not installed, this is a finding.
Cozum: Install SSH packages onto the host with the following commands:\n\n# apt-get install openssh-clients.x86_64\n# apt-get install openssh-server.x86_64\n\nNote: 32-bit versions will require different packages.

Kural_ID: SV-86859r2_rule
Onem: medium
Kural_Basligi: All networked systems must use SSH for confidentiality and integrity of transmitted and received information as well as information during preparation for transmission.
Aciklama: Without protection of the transmitted information, confidentiality and integrity may be compromised because unprotected communications can be intercepted and either read or altered. \n\nThis requirement applies to both internal and external networks and all types of information system components from which information can be transmitted (e.g., servers, mobile devices, notebook computers, printers, copiers, scanners, and facsimile machines). Communication paths outside the physical protection of a controlled boundary are exposed to the possibility of interception and modification. \n\nProtecting the confidentiality and integrity of organizational information can be accomplished by physical means (e.g., employing physical distribution systems) or by logical means (e.g., employing cryptographic techniques). If physical means of protection are employed, then logical means (cryptography) do not have to be employed, and vice versa.\n\n
Aranacak_icerik: Verify SSH is loaded and active with the following command:\n\n# systemctl status sshd\n sshd.service - OpenSSH server daemon\n   Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled)\n   Active: active (running) since Tue 2015-11-17 15:17:22 EST; 4 weeks 0 days ago\n Main PID: 1348 (sshd)\n   CGroup: /system.slice/sshd.service\n           ??1348 /usr/sbin/sshd -D\n\nIf "sshd" does not show a status of "active" and "running", this is a finding.
Cozum: ["Configure the SSH service to automatically start after reboot with the following command:\n\n# systemctl enable sshd ln -s '/usr/lib/systemd/system/sshd.service' '/etc/systemd/system/multi-user.target.wants/sshd.service'

Kural_ID: SV-86861r2_rule
Onem: medium
Kural_Basligi: All network connections associated with SSH traffic must terminate at the end of the session or after 10 minutes of inactivity, except to fulfill documented and validated mission requirements.
Aciklama: Terminating an idle SSH session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition, quickly terminating an idle SSH session will also free up resources committed by the managed network element.\n\nTerminating network connections associated with communications sessions includes, for example, de-allocating associated TCP/IP address/port pairs at the operating system level and de-allocating networking assignments at the application level if multiple application sessions are using a single operating system-level network connection. This does not mean that the operating system terminates all sessions or network access; it only ends the inactive session and releases the resources associated with that session.\n\n
Aranacak_icerik: Verify the operating system automatically terminates a user session after inactivity time-outs have expired.\n\nCheck for the value of the "ClientAlive" keyword with the following command:\n\n# grep -i clientalive /etc/ssh/sshd_config\n\nClientAliveInterval 600\n\nIf "ClientAliveInterval" is not set to "600" in "/etc/ ssh/sshd_config", and a lower value is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.
Cozum: Configure the operating system to automatically terminate a user session after inactivity time-outs have expired or at shutdown.\n\nAdd the following line (or modify the line to have the required value) to the "/etc/ssh/sshd_config" file (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor):\n\nClientAliveInterval 600\n\nThe SSH service must be restarted for changes to take effect.

Kural_ID: SV-86863r2_rule
Onem: medium
Kural_Basligi: The SSH daemon must not allow authentication using RSA rhosts authentication.
Aciklama: Configuring this setting for the SSH daemon provides additional assurance that remote logon via SSH will require a password, even in the event of misconfiguration elsewhere.
Aranacak_icerik: Verify the SSH daemon does not allow authentication using RSA rhosts authentication.\n\nTo determine how the SSH daemon\'s "RhostsRSAAuthentication" option is set, run the following command:\n\n# grep RhostsRSAAuthentication /etc/ssh/sshd_config\n\nRhostsRSAAuthentication yes\n\nIf the value is returned as "yes", the returned line is commented out, or no output is returned, this is a finding.
Cozum: Configure the SSH daemon to not allow authentication using RSA rhosts authentication.\n\nAdd the following line in "/etc/ssh/sshd_config", or uncomment the line and set the value to "no":\n\nRhostsRSAAuthentication no\n\nThe SSH service must be restarted for changes to take effect.

Kural_ID: SV-86865r2_rule
Onem: medium
Kural_Basligi: All network connections associated with SSH traffic must terminate after a period of inactivity.
Aciklama: Terminating an idle SSH session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition, quickly terminating an idle SSH session will also free up resources committed by the managed network element.\n\nTerminating network connections associated with communications sessions includes, for example, de-allocating associated TCP/IP address/port pairs at the operating system level and de-allocating networking assignments at the application level if multiple application sessions are using a single operating system-level network connection. This does not mean that the operating system terminates all sessions or network access; it only ends the inactive session and releases the resources associated with that session.\n\n
Aranacak_icerik: Verify the operating system automatically terminates a user session after inactivity time-outs have expired.\n\nCheck for the value of the "ClientAliveCountMax" keyword with the following command:\n\n# grep -i clientalivecount /etc/ssh/sshd_config\nClientAliveCountMax 0\n\nIf "ClientAliveCountMax" is not set to "0" in "/etc/ ssh/sshd_config", this is a finding.
Cozum: Configure the operating system to automatically terminate a user session after inactivity time-outs have expired or at shutdown.\n\nAdd the following line (or modify the line to have the required value) to the "/etc/ssh/sshd_config" file (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor):\n\nClientAliveCountMax 0\n\nThe SSH service must be restarted for changes to take effect.

Kural_ID: SV-86867r2_rule
Onem: medium
Kural_Basligi: The SSH daemon must not allow authentication using rhosts authentication.
Aciklama: Configuring this setting for the SSH daemon provides additional assurance that remote logon via SSH will require a password, even in the event of misconfiguration elsewhere.
Aranacak_icerik: Verify the SSH daemon does not allow authentication using known hosts authentication.\n\nTo determine how the SSH daemon\'s "IgnoreRhosts" option is set, run the following command:\n\n# grep -i IgnoreRhosts /etc/ssh/sshd_config\n\nIgnoreRhosts yes\n\nIf the value is returned as "no", the returned line is commented out, or no output is returned, this is a finding.
Cozum: Configure the SSH daemon to not allow authentication using known hosts authentication.\n\nAdd the following line in "/etc/ssh/sshd_config", or uncomment the line and set the value to "yes":\n\nIgnoreRhosts yes

Kural_ID: SV-86869r2_rule
Onem: medium
Kural_Basligi: The system must display the date and time of the last successful account logon upon an SSH logon.
Aciklama: Providing users with feedback on when account accesses via SSH last occurred facilitates user recognition and reporting of unauthorized account use.
Aranacak_icerik: Verify SSH provides users with feedback on when account accesses last occurred.\n\nCheck that "PrintLastLog" keyword in the sshd daemon configuration file is used and set to "yes" with the following command:\n\n# grep -i printlastlog /etc/ssh/sshd_config\nPrintLastLog yes\n\nIf the "PrintLastLog" keyword is set to "no", is missing, or is commented out, this is a finding.
Cozum: Configure SSH to provide users with feedback on when account accesses last occurred by setting the required configuration options in "/etc/pam.d/sshd" or in the "sshd_config" file used by the system ("/etc/ssh/sshd_config" will be used in the example) (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor).\n\nAdd the following line to the top of "/etc/pam.d/sshd":\n\nsession     required      pam_lastlog.so showfailed\n\nOr modify the "PrintLastLog" line in "/etc/ssh/sshd_config" to match the following:\n\nPrintLastLog yes\n\nThe SSH service must be restarted for changes to "sshd_config" to take effect.

Kural_ID: SV-86871r2_rule
Onem: medium
Kural_Basligi: The system must not permit direct logons to the root account using remote access via SSH.
Aciklama: Even though the communications channel may be encrypted, an additional layer of security is gained by extending the policy of not logging on directly as root. In addition, logging on with a user-specific account provides individual accountability of actions performed on the system.
Aranacak_icerik: Verify remote access using SSH prevents users from logging on directly as root.\n\nCheck that SSH prevents users from logging on directly as root with the following command:\n\n# grep -i permitrootlogin /etc/ssh/sshd_config\nPermitRootLogin no\n\nIf the "PermitRootLogin" keyword is set to "yes", is missing, or is commented out, this is a finding.
Cozum: Configure SSH to stop users from logging on remotely as the root user.\n\nEdit the appropriate  "/etc/ssh/sshd_config" file to uncomment or add the line for the "PermitRootLogin" keyword and set its value to "no" (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor):\n\nPermitRootLogin no\n\nThe SSH service must be restarted for changes to take effect.

Kural_ID: SV-86873r2_rule
Onem: medium
Kural_Basligi: The SSH daemon must not allow authentication using known hosts authentication.
Aciklama: Configuring this setting for the SSH daemon provides additional assurance that remote logon via SSH will require a password, even in the event of misconfiguration elsewhere.
Aranacak_icerik: Verify the SSH daemon does not allow authentication using known hosts authentication.\n\nTo determine how the SSH daemon\'s "IgnoreUserKnownHosts" option is set, run the following command:\n\n# grep -i IgnoreUserKnownHosts /etc/ssh/sshd_config\n\nIgnoreUserKnownHosts yes\n\nIf the value is returned as "no", the returned line is commented out, or no output is returned, this is a finding.
Cozum: Configure the SSH daemon to not allow authentication using known hosts authentication.\n\nAdd the following line in "/etc/ssh/sshd_config", or uncomment the line and set the value to "yes":\n\nIgnoreUserKnownHosts yes\n\nThe SSH service must be restarted for changes to take effect.

Kural_ID: SV-86875r2_rule
Onem: high
Kural_Basligi: The SSH daemon must be configured to only use the SSHv2 protocol.
Aciklama: SSHv1 is an insecure implementation of the SSH protocol and has many well-known vulnerability exploits. Exploits of the SSH daemon could provide immediate root access to the system.\n\n
Aranacak_icerik: Verify the SSH daemon is configured to only use the SSHv2 protocol.\n\nCheck that the SSH daemon is configured to only use the SSHv2 protocol with the following command:\n\n# grep -i protocol /etc/ssh/sshd_config\nProtocol 2\n#Protocol 1,2\n\nIf any protocol line other than "Protocol 2" is uncommented, this is a finding.
Cozum: Remove all Protocol lines that reference version "1" in "/etc/ssh/sshd_config" (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor). The "Protocol" line must be as follows:\n\nProtocol 2\n\nThe SSH service must be restarted for changes to take effect.

Kural_ID: SV-86877r2_rule
Onem: medium
Kural_Basligi: The SSH daemon must be configured to only use Message Authentication Codes (MACs) employing FIPS 140-2 approved cryptographic hash algorithms.
Aciklama: DoD information systems are required to use FIPS 140-2 approved cryptographic hash functions. The only SSHv2 hash algorithm meeting this requirement is SHA.
Aranacak_icerik: Verify the SSH daemon is configured to only use MACs employing FIPS 140-2-approved ciphers.\n\nNote: If RHEL-07-021350 is a finding, this is automatically a finding as the system cannot implement FIPS 140-2-approved cryptographic algorithms and hashes.\n\nCheck that the SSH daemon is configured to only use MACs employing FIPS 140-2-approved ciphers with the following command:\n\n# grep -i macs /etc/ssh/sshd_config\nMACs hmac-sha2-256,hmac-sha2-512\n\nIf any ciphers other than "hmac-sha2-256" or "hmac-sha2-512" are listed or the retuned line is commented out, this is a finding.
Cozum: Edit the "/etc/ssh/sshd_config" file to uncomment or add the line for the "MACs" keyword and set its value to "hmac-sha2-256" and/or "hmac-sha2-512" (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor):\n\nMACs hmac-sha2-256,hmac-sha2-512\n\nThe SSH service must be restarted for changes to take effect.

Kural_ID: SV-86879r1_rule
Onem: medium
Kural_Basligi: The SSH public host key files must have mode 0644 or less permissive.
Aciklama: If a public host key file is modified by an unauthorized user, the SSH service may be compromised.
Aranacak_icerik: Verify the SSH public host key files have mode "0644" or less permissive.\n\nNote: SSH public key files may be found in other directories on the system depending on the installation.\n\nThe following command will find all SSH public key files on the system:\n\n# find /etc/ssh -name \'*.pub\' -exec ls -lL {} \\;\n\n-rw-r--r--  1 root  wheel  618 Nov 28 06:43 ssh_host_dsa_key.pub\n-rw-r--r--  1 root  wheel  347 Nov 28 06:43 ssh_host_key.pub\n-rw-r--r--  1 root  wheel  238 Nov 28 06:43 ssh_host_rsa_key.pub\n\nIf any file has a mode more permissive than "0644", this is a finding.
Cozum: Note: SSH public key files may be found in other directories on the system depending on the installation. \n\nChange the mode of public host key files under "/etc/ssh" to "0644" with the following command:\n\n# chmod 0644 /etc/ssh/*.key.pub

Kural_ID: SV-86881r1_rule
Onem: medium
Kural_Basligi: The SSH private host key files must have mode 0600 or less permissive.
Aciklama: If an unauthorized user obtains the private SSH host key file, the host could be impersonated.
Aranacak_icerik: Verify the SSH private host key files have mode "0600" or less permissive.\n\nThe following command will find all SSH private key files on the system:\n\n# find / -name \'*ssh_host*key\'\n\nCheck the mode of the private host key files under "/etc/ssh" file with the following command:\n\n# ls -lL /etc/ssh/*key\n-rw-------  1 root  wheel  668 Nov 28 06:43 ssh_host_dsa_key\n-rw-------  1 root  wheel  582 Nov 28 06:43 ssh_host_key\n-rw-------  1 root  wheel  887 Nov 28 06:43 ssh_host_rsa_key\n\nIf any file has a mode more permissive than "0600", this is a finding.
Cozum: Configure the mode of SSH private host key files under "/etc/ssh" to "0600" with the following command:\n\n# chmod 0600 /etc/ssh/ssh_host*key

Kural_ID: SV-86883r2_rule
Onem: medium
Kural_Basligi: The SSH daemon must not permit Generic Security Service Application Program Interface (GSSAPI) authentication unless needed.
Aciklama: GSSAPI authentication is used to provide additional authentication mechanisms to applications. Allowing GSSAPI authentication through SSH exposes the system\u2019s GSSAPI to remote hosts, increasing the attack surface of the system. GSSAPI authentication must be disabled unless needed.
Aranacak_icerik: Verify the SSH daemon does not permit GSSAPI authentication unless approved.\n\nCheck that the SSH daemon does not permit GSSAPI authentication with the following command:\n\n# grep -i gssapiauth /etc/ssh/sshd_config\nGSSAPIAuthentication no\n\nIf the "GSSAPIAuthentication" keyword is missing, is set to "yes" and is not documented with the Information System Security Officer (ISSO), or the returned line is commented out, this is a finding.
Cozum: Uncomment the "GSSAPIAuthentication" keyword in "/etc/ssh/sshd_config" (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor) and set the value to "no": \n\nGSSAPIAuthentication no\n\nThe SSH service must be restarted for changes to take effect.\n\nIf GSSAPI authentication is required, it must be documented, to include the location of the configuration file, with the ISSO.

Kural_ID: SV-86885r2_rule
Onem: medium
Kural_Basligi: The SSH daemon must not permit Kerberos authentication unless needed.
Aciklama: Kerberos authentication for SSH is often implemented using Generic Security Service Application Program Interface (GSSAPI). If Kerberos is enabled through SSH, the SSH daemon provides a means of access to the system's Kerberos implementation. Vulnerabilities in the system's Kerberos implementation may then be subject to exploitation. To reduce the attack surface of the system, the Kerberos authentication mechanism within SSH must be disabled for systems not using this capability.
Aranacak_icerik: Verify the SSH daemon does not permit Kerberos to authenticate passwords unless approved.\n\nCheck that the SSH daemon does not permit Kerberos to authenticate passwords with the following command:\n\n# grep -i kerberosauth /etc/ssh/sshd_config\nKerberosAuthentication no\n\nIf the "KerberosAuthentication" keyword is missing, or is set to "yes" and is not documented with the Information System Security Officer (ISSO), or the returned line is commented out, this is a finding.
Cozum: Uncomment the "KerberosAuthentication" keyword in "/etc/ssh/sshd_config" (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor) and set the value to "no":\n\nKerberosAuthentication no\n\nThe SSH service must be restarted for changes to take effect.\n\nIf Kerberos authentication is required, it must be documented, to include the location of the configuration file, with the ISSO.

Kural_ID: SV-86887r2_rule
Onem: medium
Kural_Basligi: The SSH daemon must perform strict mode checking of home directory configuration files.
Aciklama: If other users have access to modify user-specific SSH configuration files, they may be able to log on to the system as another user.
Aranacak_icerik: Verify the SSH daemon performs strict mode checking of home directory configuration files.\n\nThe location of the "sshd_config" file may vary if a different daemon is in use.\n\nInspect the "sshd_config" file with the following command:\n\n# grep -i strictmodes /etc/ssh/sshd_config\n\nStrictModes yes\n\nIf "StrictModes" is set to "no", is missing, or the returned line is commented out, this is a finding.
Cozum: Uncomment the "StrictModes" keyword in "/etc/ssh/sshd_config" (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor) and set the value to "yes":\n\nStrictModes yes\n\nThe SSH service must be restarted for changes to take effect.

Kural_ID: SV-86889r2_rule
Onem: medium
Kural_Basligi: The SSH daemon must use privilege separation.
Aciklama: SSH daemon privilege separation causes the SSH process to drop root privileges when not needed, which would decrease the impact of software vulnerabilities in the unprivileged section.
Aranacak_icerik: Verify the SSH daemon performs privilege separation.\n\nCheck that the SSH daemon performs privilege separation with the following command:\n\n# grep -i usepriv /etc/ssh/sshd_config\n\nUsePrivilegeSeparation sandbox\n\nIf the "UsePrivilegeSeparation" keyword is set to "no", is missing, or the retuned line is commented out, this is a finding.
Cozum: Uncomment the "UsePrivilegeSeparation" keyword in "/etc/ssh/sshd_config" (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor) and set the value to "sandbox" or "yes":\n\nUsePrivilegeSeparation sandbox\n\nThe SSH service must be restarted for changes to take effect.

Kural_ID: SV-86891r2_rule
Onem: medium
Kural_Basligi: The SSH daemon must not allow compression or must only allow compression after successful authentication.
Aciklama: If compression is allowed in an SSH connection prior to authentication, vulnerabilities in the compression software could result in compromise of the system from an unauthenticated connection, potentially with root privileges.
Aranacak_icerik: Verify the SSH daemon performs compression after a user successfully authenticates.\n\nCheck that the SSH daemon performs compression after a user successfully authenticates with the following command:\n\n# grep -i compression /etc/ssh/sshd_config\nCompression delayed\n\nIf the "Compression" keyword is set to "yes", is missing, or the retuned line is commented out, this is a finding.
Cozum: Uncomment the "Compression" keyword in "/etc/ssh/sshd_config" (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor) on the system and set the value to "delayed" or "no":\n\nCompression no\n\nThe SSH service must be restarted for changes to take effect.

Kural_ID: SV-86895r1_rule
Onem: medium
Kural_Basligi: The operating system must protect against or limit the effects of Denial of Service (DoS) attacks by validating the operating system is implementing rate-limiting measures on impacted network interfaces.
Aciklama: DoS is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot accomplish its mission or must operate at degraded capacity.\n\nThis requirement addresses the configuration of the operating system to mitigate the impact of DoS attacks that have occurred or are ongoing on system availability. For each system, known and potential DoS attacks must be identified and solutions for each type implemented. A variety of technologies exist to limit or, in some cases, eliminate the effects of DoS attacks (e.g., limiting processes or establishing memory partitions). Employing increased capacity and bandwidth, combined with service redundancy, may reduce the susceptibility to some DoS attacks.
Aranacak_icerik: Verify the operating system protects against or limits the effects of DoS attacks by ensuring the operating system is implementing rate-limiting measures on impacted network interfaces.\n\nCheck the iptables configuration with the following command:\n\nNote: The command is to query rules for the public zone.\n\n# iptables -S | grep "\-m.*limit" | grep "\-\-limit-burst"\n\nIf a rule with both the limit and limit-burst arguments parameters does not exist, this is a finding.
Cozum: Create a direct iptables rule to protect against DoS attacks with the following command:\n\nNote: The command is to add a rule to the public zone.\n\n# iptables -A INPUT -i eth0 -f -m limit --limit 5/m --limit-burst 7 -j LOG --log-level 4 --log-prefix "Fragments Packets".

Kural_ID: SV-86897r1_rule
Onem: medium
Kural_Basligi: The operating system must enable an application firewall, if available.
Aciklama: Firewalls protect computers from network attacks by blocking or limiting access to open network ports. Application firewalls limit which applications are allowed to communicate over the network.\n\n
Aranacak_icerik: Verify the operating system enabled an application firewall.\n\nCheck to see if "iptables" is installed with the following command:\n\n# iptables -S\n-P INPUT ACCEPT\n-P FORWARD ACCEPT\n
-P OUTPUT ACCEPT\n\n\n\nIf an application iptables is not installed, this is a finding. \n\nIf "firewalld" does not show, this is a finding. 
Cozum: Ensure the operating system\'s application iptables is enabled.\n\nInstall the "iptables" package, if it is not on the system, with the following command:\n\n# apt-get install iptables\n\n

Kural_ID: SV-86899r1_rule
Onem: low
Kural_Basligi: The system must display the date and time of the last successful account logon upon logon.
Aciklama: Providing users with feedback on when account accesses last occurred facilitates user recognition and reporting of unauthorized account use.
Aranacak_icerik: Verify users are provided with feedback on when account accesses last occurred.\n\nCheck that "pam_lastlog" is used and not silent with the following command:\n\n# grep pam_lastlog /etc/pam.d/login\n\nsession     required      pam_lastlog.so showfailed silent\n\nIf "pam_lastlog" is missing from "/etc/pam.d/login" file, or the silent option is present on the line check for the "PrintLastLog" keyword in the sshd daemon configuration file, this is a finding.
Cozum: Configure the operating system to provide users with feedback on when account accesses last occurred by setting the required configuration options in "/etc/pam.d/login". \n\nAdd the following line to the top of "/etc/pam.d/login":\n\nsession     required      pam_lastlog.so showfailed

Kural_ID: SV-86901r1_rule
Onem: high
Kural_Basligi: There must be no .shosts files on the system.
Aciklama: The .shosts files are used to configure host-based authentication for individual users or the system via SSH. Host-based authentication is not sufficient for preventing unauthorized access to the system, as it does not require interactive identification and authentication of a connection request, or for the use of two-factor authentication.
Aranacak_icerik: Verify there are no ".shosts" files on the system.\n\nCheck the system for the existence of these files with the following command:\n\n# find / -name \'*.shosts\'\n\nIf any ".shosts" files are found on the system, this is a finding.
Cozum: Remove any found ".shosts" files from the system.\n\n# rm /[path]/[to]/[file]/.shosts

Kural_ID: SV-86903r1_rule
Onem: high
Kural_Basligi: There must be no shosts.equiv files on the system.
Aciklama: The shosts.equiv files are used to configure host-based authentication for the system via SSH. Host-based authentication is not sufficient for preventing unauthorized access to the system, as it does not require interactive identification and authentication of a connection request, or for the use of two-factor authentication.
Aranacak_icerik: Verify there are no "shosts.equiv" files on the system.\n\nCheck the system for the existence of these files with the following command:\n\n# find / -name shosts.equiv\n\nIf any "shosts.equiv" files are found on the system, this is a finding.
Cozum: Remove any found "shosts.equiv" files from the system.\n\n# rm /[path]/[to]/[file]/shosts.equiv

Kural_ID: SV-86905r1_rule
Onem: low
Kural_Basligi: For systems using DNS resolution, at least two name servers must be configured.
Aciklama: To provide availability for name resolution services, multiple redundant name servers are mandated. A failure in name resolution could lead to the failure of security functions requiring name resolution, which may include time synchronization, centralized authentication, and remote system logging.
Aranacak_icerik: [u'Determine whether the system is using local or DNS name resolution with the following command:\n\n# grep hosts /etc/nsswitch.conf\nhosts:   files dns\n\nIf the DNS entry is missing from the host\u2019s line in the "/etc/nsswitch.conf" file, the "/etc/resolv.conf" file must be empty.\n\nVerify the "/etc/resolv.conf" file is empty with the following command:\n\n# ls -al /etc/resolv.conf\n-rw-r--r--  1 root root        0 Aug 19 08:31 resolv.conf\n\nIf local host authentication is being used and the "/etc/resolv.conf" file is not empty, this is a finding.\n\nIf the DNS entry is found on the host\u2019s line of the "/etc/nsswitch.conf" file, verify the operating system is configured to use two or more name servers for DNS resolution.\n\nDetermine the name servers used by the system with the following command:\n\n# grep nameserver /etc/resolv.conf\nnameserver 192.168.1.2\nnameserver 192.168.1.3\n\nIf less than two lines are returned that are not commented out, this is a finding.
Cozum: Configure the operating system to use two or more name servers for DNS resolution.\n\nEdit the "/etc/resolv.conf" file to uncomment or add the two or more "nameserver" option lines with the IP address of local authoritative name servers. If local host resolution is being performed, the "/etc/resolv.conf" file must be empty. An empty "/etc/resolv.conf" file can be created as follows:\n\n# echo -n > /etc/resolv.conf\n\nAnd then make the file immutable with the following command:\n\n# chattr +i /etc/resolv.conf\n\nIf the "/etc/resolv.conf" file must be mutable, the required configuration must be documented with the Information System Security Officer (ISSO) and the file must be verified by the system file integrity tool.

Kural_ID: SV-86907r1_rule
Onem: medium
Kural_Basligi: The system must not forward Internet Protocol version 4 (IPv4) source-routed packets.
Aciklama: Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures. This requirement applies only to the forwarding of source-routed traffic, such as when IPv4 forwarding is enabled and the system is functioning as a router.
Aranacak_icerik: Verify the system does not accept IPv4 source-routed packets.\n\nCheck the value of the accept source route variable with the following command:\n\n# /sbin/sysctl -a | grep  net.ipv4.conf.all.accept_source_route\nnet.ipv4.conf.all.accept_source_route=0\n\nIf the returned line does not have a value of "0", a line is not returned, or the returned line is commented out, this is a finding.
Cozum: Set the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" (or modify the line to have the required value):\n\nnet.ipv4.conf.all.accept_source_route = 0

Kural_ID: SV-86909r1_rule
Onem: medium
Kural_Basligi: The system must not forward Internet Protocol version 4 (IPv4) source-routed packets by default.
Aciklama: Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures. This requirement applies only to the forwarding of source-routed traffic, such as when IPv4 forwarding is enabled and the system is functioning as a router.
Aranacak_icerik: Verify the system does not accept IPv4 source-routed packets by default.\n\nCheck the value of the accept source route variable with the following command:\n\n# /sbin/sysctl -a | grep  net.ipv4.conf.default.accept_source_route\nnet.ipv4.conf.default.accept_source_route=0\n\nIf the returned line does not have a value of "0", a line is not returned, or the returned line is commented out, this is a finding.
Cozum: Set the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" (or modify the line to have the required value):\n\nnet.ipv4.conf.default.accept_source_route = 0

Kural_ID: SV-86911r1_rule
Onem: medium
Kural_Basligi: The system must not respond to Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) echoes sent to a broadcast address.
Aciklama: Responding to broadcast (ICMP) echoes facilitates network mapping and provides a vector for amplification attacks.
Aranacak_icerik: Verify the system does not respond to IPv4 ICMP echoes sent to a broadcast address.\n\nCheck the value of the "icmp_echo_ignore_broadcasts" variable with the following command:\n\n# /sbin/sysctl -a | grep  net.ipv4.icmp_echo_ignore_broadcasts\nnet.ipv4.icmp_echo_ignore_broadcasts=1\n\nIf the returned line does not have a value of "1", a line is not returned, or the retuned line is commented out, this is a finding.
Cozum: Set the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" (or modify the line to have the required value):\n\nnet.ipv4.icmp_echo_ignore_broadcasts=1

Kural_ID: SV-86913r2_rule
Onem: medium
Kural_Basligi: The system must prevent Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages from being accepted.
Aciklama: ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An illicit ICMP redirect message could result in a man-in-the-middle attack.
Aranacak_icerik: Verify the system will not accept IPv4 ICMP redirect messages.\n\nCheck the value of the default "accept_redirects" variables with the following command:\n\n# /sbin/sysctl -a | grep  \'net.ipv4.conf.default.accept_redirects\'\nnet.ipv4.conf.default.accept_redirects=0\n\nIf the returned line does not have a value of "0", or a line is not returned, this is a finding.
Cozum: Set the system to not accept IPv4 ICMP redirect messages by adding the following line to "/etc/sysctl.conf" (or modify the line to have the required value):\n\nnet.ipv4.conf.default.accept_redirects = 0

Kural_ID: SV-86915r2_rule
Onem: medium
Kural_Basligi: The system must not allow interfaces to perform Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirects by default.
Aciklama: ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages contain information from the system's route table, possibly revealing portions of the network topology.
Aranacak_icerik: Verify the system does not allow interfaces to perform IPv4 ICMP redirects by default.\n\nCheck the value of the "default send_redirects" variables with the following command:\n\n# grep  \'net.ipv4.conf.default.send_redirects\' /etc/sysctl.conf\nnet.ipv4.conf.default.send_redirects=0\n\nIf the returned line does not have a value of "0", or a line is not returned, this is a finding.
Cozum: Configure the system to not allow interfaces to perform IPv4 ICMP redirects by default. \n\nSet the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" (or modify the line to have the required value):\n\nnet.ipv4.conf.default.send_redirects=0

Kural_ID: SV-86917r2_rule
Onem: medium
Kural_Basligi: The system must not send Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirects.
Aciklama: ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages contain information from the system's route table, possibly revealing portions of the network topology.
Aranacak_icerik: Verify the system does not send IPv4 ICMP redirect messages.\n\nCheck the value of the "all send_redirects" variables with the following command:\n\n# grep  \'net.ipv4.conf.all.send_redirects\' /etc/sysctl.conf\n\nnet.ipv4.conf.all.send_redirects=0\n\nIf the returned line does not have a value of "0", or a line is not returned, this is a finding.
Cozum: Configure the system to not allow interfaces to perform IPv4 ICMP redirects. \n\nSet the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" (or modify the line to have the required value):\n\nnet.ipv4.conf.all.send_redirects=0

Kural_ID: SV-86919r1_rule
Onem: medium
Kural_Basligi: Network interfaces must not be in promiscuous mode.
Aciklama: Network interfaces in promiscuous mode allow for the capture of all network traffic visible to the system. If unauthorized individuals can access these applications, it may allow then to collect information such as logon IDs, passwords, and key exchanges between systems.\n\nIf the system is being used to perform a network troubleshooting function, the use of these tools must be documented with the Information System Security Officer (ISSO) and restricted to only authorized personnel.
Aranacak_icerik: Verify network interfaces are not in promiscuous mode unless approved by the ISSO and documented.\n\nCheck for the status with the following command:\n\n# ip link | grep -i promisc\n\nIf network interfaces are found on the system in promiscuous mode and their use has not been approved by the ISSO and documented, this is a finding.
Cozum: Configure network interfaces to turn off promiscuous mode unless approved by the ISSO and documented.\n\nSet the promiscuous mode of an interface to off with the following command:\n\n#ip link set dev <devicename> multicast off promisc off

Kural_ID: SV-86923r1_rule
Onem: high
Kural_Basligi: A File Transfer Protocol (FTP) server package must not be installed unless needed.
Aciklama: The FTP service provides an unencrypted remote access that does not provide for the confidentiality and integrity of user passwords or the remote session. If a privileged user were to log on using this service, the privileged user password could be compromised. SSH or other encrypted file transfer methods must be used in place of this service.
Aranacak_icerik: Verify a lightweight FTP server has not been installed on the system.\n\nCheck to see if a lightweight FTP server has been installed with the following commands:\n\n# dpkg -s vsftpd\n\nIf "lftpd" is installed and is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.
Cozum: Document the "vsftpd" package with the ISSO as an operational requirement or remove it from the system with the following command:\n\n# apt-get remove vsftpds

Kural_ID: SV-86925r1_rule
Onem: high
Kural_Basligi: The Trivial File Transfer Protocol (TFTP) server package must not be installed if not required for operational support.
Aciklama: If TFTP is required for operational support (such as the transmission of router configurations) its use must be documented with the Information System Security Officer (ISSO), restricted to only authorized personnel, and have access control rules established.
Aranacak_icerik: Verify a TFTP server has not been installed on the system.\n\nCheck to see if a TFTP server has been installed with the following command:\n\n# dpkg -s tftpd \n\nIf tftpd  is installed and the requirement for tftpd is not documented with the ISSO, this is a finding.
Cozum: Remove the TFTP package from the system with the following command:\n\n# apt-get remove tftpd

Kural_ID: SV-86927r2_rule
Onem: high
Kural_Basligi: Remote X connections for interactive users must be encrypted.
Aciklama: Open X displays allow an attacker to capture keystrokes and execute commands remotely.
Aranacak_icerik: Verify remote X connections for interactive users are encrypted.\n\nCheck that remote X connections are encrypted with the following command:\n\n# grep -i x11forwarding /etc/ssh/sshd_config\nX11Fowarding yes\n\nIf the "X11Forwarding" keyword is set to "no", is missing, or is commented out, this is a finding.
Cozum: Configure SSH to encrypt connections for interactive users.\n\nEdit the "/etc/ssh/sshd_config" file to uncomment or add the line for the "X11Forwarding" keyword and set its value to "yes" (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor):\n\nX11Fowarding yes\n\nThe SSH service must be restarted for changes to take effect.

Kural_ID: SV-86931r2_rule
Onem: medium
Kural_Basligi: An X Windows display manager must not be installed unless approved.
Aciklama: Internet services that are not required for system or application processes must not be active to decrease the attack surface of the system. X Windows has a long history of security vulnerabilities and will not be used unless approved and documented.
Aranacak_icerik: Verify that if the system has X Windows System installed, it is authorized.\n\nCheck for the X11 package with the following command:\n\n# dpkg -s x11-common\n\nAsk the System Administrator if use of the X Windows System is an operational requirement.\n\nIf the use of X Windows on the system is not documented with the Information System Security Officer (ISSO), this is a finding.
Cozum: Document the requirement for an X Windows server with the ISSO or remove the related packages with the following commands:\n\n# apt-get autoremove x11-common\n\n

Kural_ID: SV-86933r1_rule
Onem: medium
Kural_Basligi: The system must not be performing packet forwarding unless the system is a router.
Aciklama: Routing protocol daemons are typically used on routers to exchange network topology information with other routers. If this software is used when not required, system network information may be unnecessarily transmitted across the network.
Aranacak_icerik: Verify the system is not performing packet forwarding, unless the system is a router.\n\nCheck to see if IP forwarding is enabled using the following command:\n\n# /sbin/sysctl -a | grep  net.ipv4.ip_forward\nnet.ipv4.ip_forward=0\n\nIf IP forwarding value is "1" and the system is hosting any application, database, or web servers, this is a finding.
Cozum: Set the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" (or modify the line to have the required value):\n\nnet.ipv4.ip_forward = 0

Kural_ID: SV-86937r1_rule
Onem: high
Kural_Basligi: SNMP community strings must be changed from the default.
Aciklama: Whether active or not, default Simple Network Management Protocol (SNMP) community strings must be changed to maintain security. If the service is running with the default authenticators, anyone can gather data about the system and the network and use the information to potentially compromise the integrity of the system or network(s). It is highly recommended that SNMP version 3 user authentication and message encryption be used in place of the version 2 community strings.
Aranacak_icerik: Verify that a system using SNMP is not using default community strings.\n\nCheck to see if the "/etc/snmp/snmpd.conf" file exists with the following command:\n\n# ls -al /etc/snmp/snmpd.conf\n -rw-------   1 root root      52640 Mar 12 11:08 snmpd.conf\n\nIf the file does not exist, this is Not Applicable.\n\nIf the file does exist, check for the default community strings with the following commands:\n\n# grep public /etc/snmp/snmpd.conf\n# grep private /etc/snmp/snmpd.conf\n\nIf either of these commands returns any output, this is a finding.
Cozum: If the "/etc/snmp/snmpd.conf" file exists, modify any lines that contain a community string value of "public" or "private" to another string value.

Kural_ID: SV-86943r1_rule
Onem: medium
Kural_Basligi: The system must not forward IPv6 source-routed packets.
Aciklama: Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures. This requirement applies only to the forwarding of source-routed traffic, such as when IPv6 forwarding is enabled and the system is functioning as a router.
Aranacak_icerik: Verify the system does not accept IPv6 source-routed packets.\n\nNote: If IPv6 is not enabled, the key will not exist, and this is not a finding.\n\nCheck the value of the accept source route variable with the following command:\n\n# /sbin/sysctl -a | grep  net.ipv6.conf.all.accept_source_route\nnet.ipv6.conf.all.accept_source_route=0\n\nIf the returned lines do not have a value of "0", or a line is not returned, this is a finding.
Cozum: Set the system to the required kernel parameter, if IPv6 is enabled, by adding the following line to "/etc/sysctl.conf" (or modify the line to have the required value):\n\nnet.ipv6.conf.all.accept_source_route = 0

Kural_ID: SV-87807r2_rule
Onem: medium
Kural_Basligi: The operating system must set the lock delay setting  for all connection types.
Aciklama: A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock.\n\nThe session lock is implemented at the point where session activity can be determined and/or controlled.
Aranacak_icerik: Verify the operating system prevents a user from overriding a screensaver lock after a 15-minute period of inactivity for graphical user interfaces. \n\nNote: If the system does not have GNOME installed, this requirement is Not Applicable. The screen program must be installed to lock sessions on the console.\n\nDetermine which profile the system database is using with the following command:\n# grep system-db /etc/dconf/profile/user\n\nsystem-db:local\n\nCheck for the lock delay setting with the following command:\n\nNote: The example below is using the database "local" for the system, so the path is "/etc/dconf/db/local.d". This path must be modified if a database other than "local" is being used.\n\n# grep -i lock-delay /etc/dconf/db/local.d/locks/*\n\n/org/gnome/desktop/screensaver/lock-delay\n\nIf the command does not return a result, this is a finding.
Cozum: Configure the operating system to prevent a user from overriding a screensaver lock after a 15-minute period of inactivity for graphical user interfaces.\n\nCreate a database to contain the system-wide screensaver settings (if it does not already exist) with the following command: \n\nNote: The example below is using the database "local" for the system, so if the system is using another database in "/etc/dconf/profile/user", the file should be created under the appropriate subdirectory.\n\n# touch /etc/dconf/db/local.d/locks/session\n\nAdd the setting to lock the screensaver lock delay:\n\n/org/gnome/desktop/screensaver/lock-delay

Kural_ID: SV-87809r2_rule
Onem: medium
Kural_Basligi: The operating system must set the session idle delay setting for all connection types.
Aciklama: A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock.\n\nThe session lock is implemented at the point where session activity can be determined and/or controlled.
Aranacak_icerik: Verify the operating system prevents a user from overriding session idle delay after a 15-minute period of inactivity for graphical user interfaces. The screen program must be installed to lock sessions on the console.\n\nNote: If the system does not have GNOME installed, this requirement is Not Applicable. \n\nDetermine which profile the system database is using with the following command:\n# grep system-db /etc/dconf/profile/user\n\nsystem-db:local\n\nCheck for the session idle delay setting with the following command:\n\nNote: The example below is using the database "local" for the system, so the path is "/etc/dconf/db/local.d". This path must be modified if a database other than "local" is being used.\n\n# grep -i idle-delay /etc/dconf/db/local.d/locks/*\n\n/org/gnome/desktop/session/idle-delay\n\nIf the command does not return a result, this is a finding.
Cozum: Configure the operating system to prevent a user from overriding a session lock after a 15-minute period of inactivity for graphical user interfaces.\n\nCreate a database to contain the system-wide screensaver settings (if it does not already exist) with the following command: \n\nNote: The example below is using the database "local" for the system, so if the system is using another database in /etc/dconf/profile/user, the file should be created under the appropriate subdirectory.\n\n# touch /etc/dconf/db/local.d/locks/session\n\nAdd the setting to lock the session idle delay:\n\n/org/gnome/desktop/session/idle-delay

Kural_ID: SV-87811r2_rule
Onem: medium
Kural_Basligi: When passwords are changed or new passwords are established, pwquality must be used.
Aciklama: Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. "Pwquality" enforces complex password construction configuration on the system.
Aranacak_icerik: Verify the operating system uses "pwquality" to enforce the password complexity rules. \n\nCheck for the use of "pwquality" with the following command:\n\n# grep pwquality /etc/pam.d/common-password\n\npassword    required    pam_pwquality.so retry=3\n\nIf the command does not return a line containing the value "pam_pwquality.so", this is a finding.
Cozum: Configure the operating system to use "pwquality" to enforce password complexity rules.\n\nAdd the following line to "/etc/pam.d/common-password" (or modify the line to have the required value):\n\npassword    required    pam_pwquality.so retry=3

Kural_ID: SV-87813r1_rule
Onem: medium
Kural_Basligi: File systems that are being imported via Network File System (NFS) must be mounted to prevent binary files from being executed.
Aciklama: The "noexec" mount option causes the system to not execute binary files. This option must be used for mounting any file system not containing approved binary files as they may be incompatible. Executing files from untrusted file systems increases the opportunity for unprivileged users to attain unauthorized administrative access.
Aranacak_icerik: Verify file systems that are being NFS exported are mounted with the "noexec" option.\n\nFind the file system(s) that contain the directories being exported with the following command:\n\n# more /etc/fstab | grep nfs\n\nUUID=e06097bb-cfcd-437b-9e4d-a691f5662a7d    /store           nfs           rw,noexec                                                    0 0\n\nIf a file system found in "/etc/fstab" refers to NFS and it does not have the "noexec" option set, and use of NFS exported binaries is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.
Cozum: Configure the "/etc/fstab" to use the "noexec" option on file systems that are being exported via NFS.

Kural_ID: SV-87815r2_rule
Onem: medium
Kural_Basligi: The audit system must take appropriate action when there is an error sending audit records to a remote system.
Aciklama: Taking appropriate action when there is an error sending audit records to a remote system will minimize the possibility of losing audit records.
Aranacak_icerik: Verify the action the operating system takes if there is an error sending audit records to a remote system.\n\nCheck the action that takes place if there is an error sending audit records to a remote system with the following command:\n\n# grep -i network_failure_action /etc/audisp/audisp-remote.conf\nnetwork_failure_action = stop\n\nIf the value of the "network_failure_action" option is not "syslog", "single", or "halt", or the line is commented out, this is a finding.
Cozum: Configure the action the operating system takes if there is an error sending audit records to a remote system.\n\nUncomment the "network_failure_action" option in "/etc/audisp/audisp-remote.conf" and set it to "syslog", "single", or "halt".\n\nnetwork_failure_action = single

Kural_ID: SV-87817r2_rule
Onem: medium
Kural_Basligi: The operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/group.
Aciklama: Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).
Aranacak_icerik: Verify the operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect "/etc/group".\n\nCheck the auditing rules in "/etc/audit/audit.rules" with the following command:\n\n# grep /etc/group /etc/audit/audit.rules\n\n-w /etc/group -p wa -k audit_rules_usergroup_modification\n\nIf the command does not return a line, or the line is commented out, this is a finding.
Cozum: Configure the operating system to generate audit records for all account creations, modifications, disabling, and termination events that affect "/etc/group".\n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules":\n\n-w /etc/group -p wa -k identity\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-87819r2_rule
Onem: medium
Kural_Basligi: The operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/gshadow.
Aciklama: Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).
Aranacak_icerik: Verify the operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect "/etc/gshadow".\n\nCheck the auditing rules in "/etc/audit/audit.rules" with the following command:\n\n# grep /etc/gshadow /etc/audit/audit.rules\n\n-w /etc/gshadow -p wa -k audit_rules_usergroup_modification\n\nIf the command does not return a line, or the line is commented out, this is a finding.
Cozum: Configure the operating system to generate audit records for all account creations, modifications, disabling, and termination events that affect "/etc/gshadow".\n\nAdd or update the following rule in "/etc/audit/rules.d/audit.rules":\n\n-w /etc/gshadow -p wa -k identity\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-87823r2_rule
Onem: medium
Kural_Basligi: The operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/shadow.
Aciklama: Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).
Aranacak_icerik: Verify the operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/shadow.\n\nCheck the auditing rules in "/etc/audit/audit.rules" with the following command:\n\n# grep /etc/shadow /etc/audit/audit.rules\n\n-w /etc/shadow -p wa -k audit_rules_usergroup_modification\n\nIf the command does not return a line, or the line is commented out, this is a finding.
Cozum: Configure the operating system to generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/shadow.\n\nAdd or update the following file system rule in "/etc/audit/rules.d/audit.rules":\n\n-w /etc/shadow -p wa -k identity\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-87825r2_rule
Onem: medium
Kural_Basligi: The operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/opasswd.
Aciklama: Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).
Aranacak_icerik: Verify the operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/opasswd.\n\nCheck the auditing rules in "/etc/audit/rules.d/audit.rules" with the following command:\n\n# grep /etc/opasswd /etc/audit/rules.d/audit.rules\n\n-w /etc/opasswd -p wa -k audit_rules_usergroup_modification\n\nIf the command does not return a line, or the line is commented out, this is a finding.
Cozum: Configure the operating system to generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/opasswd.\n\nAdd or update the following file system rule in "/etc/audit/rules.d/audit.rules":\n\n-w /etc/opasswd -p wa -k identity\n\nThe audit daemon must be restarted for the changes to take effect.

Kural_ID: SV-87827r2_rule
Onem: medium
Kural_Basligi: The system must ignore Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages.
Aciklama: ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An illicit ICMP redirect message could result in a man-in-the-middle attack.
Aranacak_icerik: Verify the system ignores IPv4 ICMP redirect messages.\n\nCheck the value of the "accept_redirects" variables with the following command:\n\n# /sbin/sysctl -a | grep  \'net.ipv4.conf.all.accept_redirects\'\n\nnet.ipv4.conf.all.accept_redirects=0\n\nIf both of the returned lines do not have a value of "0", or a line is not returned, this is a finding.
Cozum: Set the system to ignore IPv4 ICMP redirect messages by adding the following line to "/etc/sysctl.conf" (or modify the line to have the required value):\n\nnet.ipv4.conf.all.accept_redirects = 0

Kural_ID: SV-87829r1_rule
Onem: medium
Kural_Basligi: Wireless network adapters must be disabled.
Aciklama: The use of wireless networking can introduce many different attack vectors into the organization's network. Common attack vectors such as malicious association and ad hoc networks will allow an attacker to spoof a wireless access point (AP), allowing validated systems to connect to the malicious AP and enabling the attacker to monitor and record network traffic. These malicious APs can also serve to create a man-in-the-middle attack or be used to create a denial of service to valid network resources.
Aranacak_icerik: Verify that there are no wireless interfaces configured on the system.\n\nThis is N/A for systems that do not have wireless network adapters.\n\nCheck for the presence of active wireless interfaces with the following command:\n\n# nmcli device\nDEVICE TYPE STATE\neth0 ethernet connected\nwlp3s0 wifi disconnected\nlo loopback unmanaged\n\nIf a wireless interface is configured and its use on the system is not documented with the Information System Security Officer (ISSO), this is a finding.
Cozum: Configure the system to disable all wireless network interfaces with the following command:\n\n#nmcli radio wifi off