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The article details a bug bounty hunter’s journey to discovering a critical (P1) vulnerability. Key steps included thorough reconnaissance, endpoint analysis, and exploiting hidden functionalities. Below are practical insights and commands to replicate such success.
You Should Know:
1. Reconnaissance & Hidden Endpoints
- Use `ffuf` for directory brute-forcing:
ffuf -w /path/to/wordlist.txt -u https://target.com/FUZZ -mc 200,403 -v
– `gau` (Get All URLs) to fetch historical endpoints:
gau target.com | grep "api|admin"
– `waybackurls` for archived paths:
waybackurls target.com | tee urls.txt
2. JavaScript Analysis
- Extract endpoints from JS files:
curl -s https://target.com/main.js | grep -E "/(api|admin|v1)/"
– `LinkFinder` for hidden API paths:
python3 linkfinder.py -i https://target.com/script.js -o cli
3. Exploiting Misconfigurations
- Test for IDOR (Insecure Direct Object Reference):
curl -X GET "https://target.com/api/user?id=1234" -H "Cookie: admin_session=XYZ"
- Check JWT flaws:
jwt_tool <JWT_TOKEN> -C -d wordlist.txt
4. Reporting the Bug
- Use `curl` to replicate the exploit:
curl -X POST "https://target.com/api/deleteUser" -d "user_id=*" -H "X-API-Key: NULL"
- Document with `Burp Suite` or `OBS` for video proof.
What Undercode Say
Bug bounty hunting requires persistence. Key takeaways:
- Automate recon with
ffuf,gau, andwaybackurls. - Analyze JS for hidden endpoints.
- Test edge cases (e.g.,
user_id=*, `NULL` API keys). - Linux commands like
grep,curl, and `jq` are essential. - Windows equivalents: Use `Invoke-WebRequest` (PowerShell) for testing APIs.
Expected Output:
A documented P1 vulnerability report with:
1. Steps to reproduce.
2. Impact analysis.
3. Mitigation recommendations.
Reference: Original
References:
Reported By: Cyxbugs How – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
