/web-app-logic

name: web-app-logic
description: Web application logic testing - business logic flaws, race conditions, access control, cache poisoning/deception, and information disclosure.

Web Application Logic

Test for logic flaws and application-specific vulnerabilities that automated scanners miss.

Techniques

| Type | Key Vectors | |------|-------------| | **Business Logic** | Workflow bypass, price manipulation, feature abuse | | **Race Conditions** | TOCTOU, limit bypass, double-spend, parallel requests | | **Access Control** | IDOR, horizontal/vertical privilege escalation, forced browsing | | **Cache Poisoning** | Unkeyed headers/parameters, fat GET, response splitting | | **Cache Deception** | Path confusion, static extension tricks, normalization | | **Info Disclosure** | Error messages, debug endpoints, source code, metadata |

Workflow

1. Map application workflows and business rules 2. Identify state-dependent operations and trust boundaries 3. Test logic assumptions with edge cases and race conditions 4. Verify access control across user roles 5. Document impact with PoC demonstrations

Reference

• `reference/business-logic*.md` - Business logic testing techniques
• `reference/race-conditions*.md` - Race condition exploitation
• `reference/access-control*.md` - Access control bypass methods
• `reference/web-cache-poisoning*.md` - Cache poisoning techniques
• `reference/web-cache-deception*.md` - Cache deception attacks
• `reference/information-disclosure*.md` - Information disclosure testing