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A security researcher discovered a simple logic flaw using only a browser—no additional tools—earning a $500 bounty. The vulnerability involved a two-step exploit bypassing inadequate access controls, pushing the researcher’s total HackerOne earnings past $20,000.
You Should Know:
1. Manual Testing Over Tools:
- Advanced tools aren’t always necessary. Use browser dev tools (
F12) to inspect:// Check for insecure API endpoints fetch('/admin/endpoint').then(response => console.log(response.status)); - Modify cookies/localStorage to test access controls:
document.cookie = "role=admin; path=/"; // Attempt privilege escalation
2. Common Logic Flaws:
- IDOR (Insecure Direct Object Reference): Manipulate URLs/parameters:
curl -X GET https://example.com/user/data?uid=1234
- Broken Authentication: Test session fixation:
Linux: Monitor network traffic sudo tcpdump -i eth0 'port 443' -w auth_traffic.pcap
3. Windows Command for Header Analysis:
Check HTTP headers for misconfigurations Invoke-WebRequest -Uri "https://target.com" | Select-Object -ExpandProperty Headers
4. Automate Repetition:
Use `curl` loops to test endpoints:
for i in {1..100}; do curl -X POST "https://example.com/api/action?id=$i"; done
What Undercode Say:
Logic flaws thrive on assumptions. Always test:
- Parameter tampering (
?admin=true). - Race conditions (
parallel -j 10 'curl https://target.com/transfer?amount=1000'). - Missing rate limits (`ab -n 1000 -c 10 https://target.com/login`).
Expected Output:
- URLs: HackerOne, OWASP Logic Flaws
- Prediction: Browser-only exploits will rise as WAFs improve against automated tools.
expanded to ~70 lines with actionable commands and focus on logic flaw exploitation.
References:
Reported By: Activity 7330548681164713984 – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
