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OWASP API Security Top 10 Course – Secure Your Web Apps

Disclaimer: This is a personal summary and interpretation based on a YouTube video. It is not official material and not endorsed by the original creator. All rights remain with the respective creators.

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This document summarizes the key takeaways from the video. I highly recommend watching the full video for visual context and coding demonstrations.

Before You Get Started

  • I summarize key points to help you learn and review quickly.
  • Simply click on Ask AI links to dive into any topic you want.

Introduction to OWASP API Security Top 10

The OWASP API Security Top 10 serves as a guide to the most critical API vulnerabilities, helping developers and organizations mitigate threats. This course covers the 2023 update, plus bonus topics, taught by Corey Ball, an API security expert. It includes free resources like quizzes and certificates from APIsec University.

Course Structure and Objectives

The course targets bug bounty hunters, developers, penetration testers, and leaders interested in API security. It assumes familiarity with API security fundamentals. Objectives include understanding the Top 10 risks, preparing for the CASA exam, and learning to identify and reduce API vulnerabilities. Quizzes require 100% to pass for certification.

OWASP and the API Security Project

OWASP is a nonprofit improving application security, known for its Top 10 lists. The API Security Top 10, started in 2019 by Erez Yalon and Inon Shkedy, addresses rapid API adoption, security gaps, and new attack vectors. It's compiled from public data like bug bounties and incidents, with references to CWE and NIST.

Updates from 2019 to 2023

The 2023 list reflects rising API attacks and market growth. Changes include removing Injection and Insufficient Logging; keeping BOLA, BFLA, and Security Misconfiguration; renaming four categories; and adding five new ones like SSRF and Unsafe Consumption of APIs. Risk ratings use OWASP's methodology, focusing on exploitability.

API1:2023 - Broken Object Level Authorization (BOLA)

BOLA happens without proper authorization checks, allowing access to others' sensitive data by manipulating object IDs. It's common due to complex access controls and hard to detect automatically. Impact includes data disclosure or account takeover. Prevent by implementing robust authorization, using unpredictable IDs, and testing mechanisms.

API2:2023 - Broken Authentication

This covers weaknesses in authentication processes, like weak passwords, credential stuffing, or predictable tokens. JWT misconfigurations are common. Impact allows account control and sensitive actions. Prevent with standards like OAuth, MFA, brute-force protections, and weak-password checks.

API3:2023 - Broken Object Property Level Authorization (BOPLA)

BOPLA combines Excessive Data Exposure (unfiltered responses) and Mass Assignment (altering sensitive properties). It exposes or allows changes to unauthorized properties. Impact includes data leaks or privilege escalation. Prevent by cherry-picking properties, avoiding generic methods, and using schema validation.

API4:2023 - Unrestricted Resource Consumption

This occurs without limits on resources like timeouts or file sizes, leading to DoS or high costs. Common in APIs without rate limiting. Impact includes service denial or cost spikes. Prevent with Docker limits, rate limiting, and parameter validation.

API5:2023 - Broken Function Level Authorization (BFLA)

BFLA lacks controls on functions, allowing unauthorized actions like privilege escalation. Often due to complex roles. Impact includes data loss or disruption. Prevent with a default-deny authorization module and role-based checks.

API6:2023 - Unrestricted Access to Sensitive Business Flows

This allows exploitation of API workflows, like depleting stock via automation. Requires understanding business models. Impact harms business without technical disruption. Prevent with device fingerprinting, human detection like CAPTCHA, and pattern analysis.

API7:2023 - Server Side Request Forgery (SSRF)

SSRF lets users control remote requests, exposing internal data or enabling scans. Includes in-band (response returned) and blind types. Impact includes info disclosure or DoS. Prevent by isolating mechanisms, using allow lists, and validating inputs.

API8:2023 - Security Misconfiguration

This catch-all includes misconfigured headers, encryption, or defaults, leading to compromises. Common in API stacks. Impact exposes data or systems. Prevent with hardening processes, encrypted channels, and schema enforcement.

API9:2023 - Improper Inventory Management

Exposing unsupported or non-production APIs risks vulnerabilities in old versions. Detected via docs or fuzzing. Impact includes data access or takeovers. Prevent with inventory, documentation, and protection measures.

API10:2023 - Unsafe Consumption of APIs

Consumers trusting third-party APIs without validation risk injections or leaks. Focuses on integration security. Impact varies by data use. Prevent by assessing providers, secure channels, and sanitizing data.

Injection Vulnerabilities

Injection passes malicious data to interpreters like SQL or OS commands. Common in queries or parsers. Impact includes data loss or takeover. Prevent with validation, sanitization, and parameterized interfaces.

Insufficient Logging and Monitoring

Without proper logging, attacks go undetected. Logs track activities for compliance. Impact allows full compromises. Prevent by logging failures, using SIEM, and custom alerts.

Business Logic Vulnerabilities

These exploit intended features via misplaced trust, like assuming user behavior. Unique to each API. Impact bypasses controls. Prevent with threat modeling, training, and reducing trust.

About the summarizer

I'm Ali Sol, a Backend Developer. Learn more: