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Recently, a self-hosted bug bounty program uncovered three critical vulnerabilities during testing:
- Broken Authentication – A medium-severity (P3) flaw where authentication mechanisms failed, though marked out of scope.
- Information Disclosure – A privacy-related security issue exposing sensitive data (P3), also deemed out of scope.
- Session Misconfiguration – A valid session vulnerability flagged as a duplicate.
These issues were dismissed due to affecting an inactive subdomain, but they highlight common security gaps in web applications.
You Should Know: Practical Security Testing & Commands
1. Testing Broken Authentication
- Use Burp Suite or OWASP ZAP to intercept login requests:
zap-cli quick-scan --spider -o '-config api.disablekey=true' http://example.com
- Check for weak credentials with Hydra:
hydra -L users.txt -P passwords.txt example.com http-post-form "/login:user=^USER^&pass=^PASS^:Invalid"
2. Detecting Information Disclosure
- Scan for exposed directories/files using Gobuster:
gobuster dir -u http://example.com -w /usr/share/wordlists/dirb/common.txt
- Check misconfigured S3 buckets with AWS CLI:
aws s3 ls s3://bucket-name --no-sign-request
3. Session Misconfiguration Testing
- Verify cookie security with curl:
curl -I http://example.com --cookie "sessionid=12345"
- Test for Session Fixation using Burp Repeater.
What Undercode Say
Bug bounty hunting requires persistence, even for out-of-scope findings. Key takeaways:
– Always document all vulnerabilities, even if rejected.
– Use automated tools (e.g., Nmap, Nikto) alongside manual testing.
– Practice ethical disclosure and follow program rules.
Expected Output:
- A detailed report with proof-of-concept (PoC) steps.
- Mitigation recommendations (e.g., enforce HTTP Strict Transport Security (HSTS)).
Prediction
As bug bounty programs grow, expect stricter scope definitions but higher rewards for novel attack vectors (e.g., API flaws, cloud misconfigurations).
Relevant URLs:
References:
Reported By: Dev Patel – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
