Api Fuzzing Bug Bounty

What it does

This skill provides guidance and techniques for testing APIs (REST, SOAP, and GraphQL) during bug bounty hunting and penetration testing engagements. It covers vulnerability discovery, authentication bypasses, insecure direct object reference (IDOR) exploitation, and other API-specific attack vectors. The skill assists in identifying vulnerabilities such as SQL injection points and unauthorized data access within these APIs.

When to use it

• When conducting a bug bounty program or penetration test on an application with APIs.
• To identify potential IDOR vulnerabilities by systematically testing user/resource identifiers.
• For assessing the security of REST, SOAP, or GraphQL API endpoints.

Key capabilities

• Provides techniques for identifying API types (REST, SOAP, GraphQL).
• Offers guidance on API reconnaissance, including finding Swagger/OpenAPI documentation and using tools like Kiterunner.
• Includes strategies for authentication testing, including checking rate limiting and differentiating between mobile and web APIs.
• Details methods for IDOR exploitation.
• Covers techniques to identify SQL injection points and unauthorized data access.

Example prompts

• "How can I enumerate API endpoints?"
• "What are common authentication bypass techniques for REST APIs?"
• "Explain how to test for IDOR vulnerabilities."
• “Describe the structure of a SOAP API.”

Tips & gotchas

• Authorization Required: This skill is intended only for authorized security assessments, defensive validation, or controlled educational environments. Unauthorized use is prohibited.
• Prerequisites: Familiarity with REST/GraphQL/SOAP protocols, Burp Suite (or similar proxy tool), API wordlists, and basic Python scripting are required to effectively utilize this skill.
• Documentation Needed: Having target API endpoints and documentation significantly improves the effectiveness of the techniques described.