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Introduction:
Bug bounty hunting is a lucrative and rewarding field in cybersecurity, where ethical hackers identify vulnerabilities in systems and report them for monetary rewards. Kullai Metikala’s recent $5,800 earnings in June—including a $4,000 GitHub PAT token leak—demonstrate the high-impact vulnerabilities that can lead to significant payouts. This article breaks down key techniques, commands, and strategies for aspiring bug bounty hunters.
Learning Objectives:
- Understand common bug bounty vulnerabilities (token leaks, auth bypass, privilege escalation).
- Learn verified Linux/Windows commands for vulnerability detection.
- Master recon techniques to identify high-value targets.
You Should Know:
1. GitHub PAT Token Leak Detection
Command:
grep -r "ghp_[a-zA-Z0-9]{36}" /path/to/codebase
What It Does:
Scans directories for exposed GitHub Personal Access Tokens (PATs), which can grant unauthorized CRUD permissions.
Step-by-Step Guide:
1. Run the command in a target repository.
- If matches are found, validate the token using:
curl -H "Authorization: token ghp_..." https://api.github.com/user
- Report the leak responsibly via HackerOne or the platform’s security team.
2. Authentication Bypass Testing
Command (Burp Suite):
GET /admin HTTP/1.1 Host: target.com X-Original-URL: /user
What It Does:
Tests for misconfigured proxy rules or header-based auth bypasses.
Step-by-Step Guide:
- Intercept a request to an admin panel using Burp Suite.
2. Modify headers (`X-Original-URL`, `X-Forwarded-For`).
- Replay the request—if access is granted, it’s a valid bypass.
3. Privilege Escalation via Misconfigured Sudo
Command (Linux):
sudo -l
What It Does:
Lists sudo permissions for the current user, revealing exploitable binaries.
Step-by-Step Guide:
- Run `sudo -l` to check for vulnerable binaries (e.g.,
nmap,vim).
2. If `(ALL) NOPASSWD` is set, escalate privileges:
sudo nmap --interactive !sh
4. Information Disclosure via API Misconfigurations
Command (cURL):
curl -X GET https://api.target.com/v1/users -H "Accept: application/json"
What It Does:
Checks for exposed user data in APIs due to weak access controls.
Step-by-Step Guide:
- Test endpoints with different HTTP methods (
GET,POST). - Look for sensitive data (emails, IDs) in responses.
3. Report improper data exposure.
5. Cloud Hardening: AWS S3 Bucket Enumeration
Command (AWS CLI):
aws s3 ls s3://bucket-name --no-sign-request
What It Does:
Checks for publicly accessible S3 buckets.
Step-by-Step Guide:
- Use tools like `s3scanner` or manual AWS CLI checks.
2. If `–no-sign-request` works, the bucket is misconfigured.
3. Report open buckets containing sensitive data.
What Undercode Say:
- Key Takeaway 1: Recon is king. Tools like
grep,curl, and `aws cli` are essential for uncovering leaks. - Key Takeaway 2: Low-hanging fruit pays. Auth bypasses and token leaks often yield high bounties with minimal effort.
Analysis:
Kullai’s success highlights the importance of automation (scripts for token detection) and persistence (testing multiple attack vectors). The $4,000 GitHub PAT leak underscores how developers often hardcode secrets, making them prime targets. As APIs and cloud services grow, so do misconfigurations—bug hunters must focus on these areas for consistent rewards.
Prediction:
With AI-driven tools (like Semgrep for code scanning) becoming mainstream, bug bounty hunting will shift toward automated vulnerability discovery. However, human ingenuity in chaining exploits (e.g., token leak → privilege escalation) will remain invaluable. Expect platforms like HackerOne to introduce AI-assisted triaging, speeding up payouts for critical findings.
Final Tip: Always document and reproduce vulnerabilities clearly in reports—this increases credibility and payout chances. Happy hunting! 🚀
IT/Security Reporter URL:
Reported By: Kullai Metikala – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
