Business Logic Flaws
Identifying and exploiting business logic vulnerabilities
Key Concepts
Security Mindset
Think like an attacker - what can go wrong, what can be abused?
Defense in Depth
Multiple layers of security controls, no single point of failure.
Least Privilege
Grant minimum permissions needed for functionality.
Trust Boundaries
Identify where data crosses trust levels and validate at each boundary.
Learning Material
What You'll Learn
Identifying and exploiting business logic vulnerabilities
Think like an attacker - what can go wrong, what can be abused?
Multiple layers of security controls, no single point of failure.
Grant minimum permissions needed for functionality.
Identify where data crosses trust levels and validate at each boundary.
Race Conditions & Business Logic Research
Purpose: Understanding timing attacks and logic flaws
Priority: HIGH (identified gap in your tooling)
Your Agent: h1-race-agent
Last Updated: December 28, 2025
Why This Matters
From your GAP_ANALYSIS_2025.md: - Race Conditions: $5K-$25K payouts - Current tooling: ❌ No tooling - Missing: Turbo Intruder, race-the-web
Contents
Core Concepts
- Race Condition Fundamentals
- Business Logic Vulnerabilities
Attack Techniques
- Race Condition Techniques
- Payment Attack Techniques
- Business Logic Attacks
Case Studies
- Case Studies Index
Quick Reference
Race Condition Types
| Type | Description | Example |
|---|---|---|
| Limit Overrun | Bypass rate/quantity limits | Multi-redeem coupon |
| TOCTOU | Time-of-check to time-of-use | File operation race |
| Double Spend | Transaction processed twice | Balance manipulation |
| State Confusion | Inconsistent state | Parallel workflows |
Business Logic Targets
| Target | Attack Type | Payout |
|---|---|---|
| Payment flows | Price manipulation | $5K-$25K |
| Coupon/promo codes | Unlimited redemption | $2K-$10K |
| Account operations | Parallel signup bonus | $1K-$5K |
| Voting/rating | Multiple votes | $500-$3K |
Navigation
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- Main: Knowledge Base README
Practical Examples
Practice examples coming soon. Check the Certs section for related labs.
Test Questions
What is a CSRF token bypass technique?
What is clickjacking?
How do you prevent clickjacking?
Test Your Knowledge
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What is a CSRF token bypass technique?
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What is clickjacking?
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