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In penetration testing, account takeover vulnerabilities aren’t always found in headers (e.g., X-Forwarded-For, Origin). Sometimes, they lurk in the request body, where parameters can be manipulated for unauthorized access.
You Should Know:
1. Testing Request Body Parameters
- Intercept requests (Burp Suite, OWASP ZAP) and modify body parameters like:
{"user_id":"victim","new_email":"[email protected]"} - Test for IDOR (Insecure Direct Object Reference) by swapping IDs:
POST /api/change-email HTTP/1.1 Host: example.com Content-Type: application/json {"user_id":123,"email":"[email protected]"}
2. Deep Parameter Fuzzing
Use `ffuf` or `wfuzz` to brute-force parameters:
ffuf -u https://example.com/reset-password -X POST -d '{"FUZZ":"test"}' -w wordlist.txt
3. Server-Side Validation Bypass
- Hardcoded Values: Even if the response is
200 OK, check if the server enforces validation:curl -X POST 'https://example.com/update-profile' --data 'admin=true&role=superuser'
- JSON Manipulation: Add unexpected fields:
{"username":"user1","is_admin":true}
4. Email Reset Poisoning
Check if reset tokens are predictable or reusable:
for i in {1..100}; do curl -s "https://example.com/reset?token=$i" | grep "Password Reset"; done
5. Session Fixation in Body
Modify `session_id` in POST data:
POST /login HTTP/1.1 Host: example.com Content-Type: application/x-www-form-urlencoded session_id=HACKEDSESSION123
What Undercode Say
Always test every input vector—headers, body, cookies, and API parameters. Automation helps, but manual inspection catches edge cases. Use:
– Linux Commands: curl, `jq` (for JSON parsing), `grep`
– Windows: `Invoke-WebRequest` in PowerShell
– Exploitation: SQLi, XSS, and CSRF can also hide in body params.
Expected Output:
A compromised account via manipulated body parameters or a bypassed security check.
URLs (if applicable):
References:
Reported By: Cristivlad Account – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
