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pentest-business-logic

The pentest-business-logic skill systematically tests for workflow bypass, payment manipulation, state machine abuse, and function limit circumvention flaws in applications. Use this when authorized to identify business logic vulnerabilities that escape standard taint analysis, such as step skipping in multi-step processes, coupon reuse exploits, price manipulation during checkout, and role-based constraint violations across OWASP WSTG business logic categories.

View source Repository: JoySafeter

Install in Claude Code

Copy

git clone --depth 1 https://github.com/jd-opensource/JoySafeter /tmp/pentest-business-logic && cp -r /tmp/pentest-business-logic/skills/pentest-business-logic ~/.claude/skills/pentest-business-logic

Then start a new Claude Code session; the skill loads automatically.

Definition

SKILL.md

# Pentest Business Logic

## Purpose
Identify flaws in application workflow enforcement, business rule validation, and state machine integrity that cannot be found by taint analysis or pattern matching. These vulnerabilities require understanding intended behavior and finding deviations.

## Prerequisites

### Authorization Requirements
- **Written authorization** with explicit scope for business logic testing
- **Test accounts** at multiple privilege levels (user, admin, premium, etc.)
- **Test payment methods** or sandbox payment environment for financial testing
- **Rollback plan** for any data-mutating tests (order creation, account changes)

### Environment Setup
- Burp Suite Professional with Repeater/Intruder configured
- Playwright or Selenium for multi-step browser automation
- Proxy configured to capture all application traffic
- Test data seeded for workflow testing (products, coupons, user accounts)

## Core Workflow
1. **Workflow Mapping**: Extract multi-step flows (checkout, registration, approval chains, onboarding) from recon deliverables and source code. Document expected state transitions and business constraints.
2. **Rule Extraction**: Identify server-side business constraints — price validation, quantity limits, role-gated actions, time-based restrictions, coupon rules, referral limits.
3. **Step Circumvention**: Skip, replay, reorder steps in multi-step workflows. Access final-step endpoints directly without completing prerequisites (WSTG-BUSL-06).
4. **Data Integrity Abuse**: Submit negative quantities, zero-price items, boundary values, type confusion in business fields. Test forged request parameters (WSTG-BUSL-02/03).
5. **Function Limit Bypass**: Test coupon reuse, referral loops, vote stuffing, resource exhaustion through legitimate endpoints (WSTG-BUSL-05).
6. **File Upload Logic**: Upload unexpected file types, oversized files, polyglot files, content-type mismatch, path traversal in filenames (WSTG-BUSL-08/09).
7. **Payment Testing**: Price manipulation at each checkout stage, currency confusion, discount stacking, partial payment abuse (WSTG-BUSL-10).

## WSTG Coverage

| WSTG ID | Test Name | Status |
|---------|-----------|--------|
| WSTG-BUSL-01 | Test Business Logic Data Validation | ✅ |
| WSTG-BUSL-02 | Test Ability to Forge Requests | ✅ |
| WSTG-BUSL-03 | Test Integrity Checks | ✅ |
| WSTG-BUSL-04 | Test for Process Timing | ✅ |
| WSTG-BUSL-05 | Test Number of Times a Function Can Be Used Limits | ✅ |
| WSTG-BUSL-06 | Testing for the Circumvention of Work Flows | ✅ |
| WSTG-BUSL-07 | Test Defenses Against Application Misuse | ✅ |
| WSTG-BUSL-08 | Test Upload of Unexpected File Types | ✅ |
| WSTG-BUSL-09 | Test Upload of Malicious Files | ✅ |
| WSTG-BUSL-10 | Test Payment Functionality | ✅ |

## Tool Categories

| Category | Tools | Purpose |
|----------|-------|---------|
| Request Manipulation | Burp Repeater, Burp Intruder, mitmproxy | Modify request parameters, replay/reorder steps |
| Browser Automation | Playwright, Selenium | Multi-step workflow testing, UI interaction |
| Scripting | Python requests, aiohttp | Custom workflow abuse scripts, parallel requests |
| File Upload | custom polyglot generators, ExifTool | File type confusion, metadata injection |
| Payment Testing | Stripe test mode, PayPal sandbox | Safe payment manipulation testing |

## References
- `references/tools.md` - Tool function signatures and parameters
- `references/workflows.md` - Attack pattern definitions and test vectors