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There are times when a user’s privileges must be revoked:
1. The user no longer needs the permissions.
2. The user has changed job roles.
- The user is no longer trusted due to misconduct.
However, many web applications fail to properly enforce privilege revocation, leading to orphaned privileges—where a user retains access despite apparent permission changes.
How to Find Orphaned Privileges
1. Grant Elevated Privileges (as an admin):
- Assign a test user additional permissions or a higher role.
- Example Linux command to simulate role assignment:
sudo usermod -aG admin testuser
2. Perform Privileged API Calls:
- Use the test account to access restricted endpoints.
- Example `curl` command to test API access:
curl -X GET -H "Authorization: Bearer <token>" https://api.example.com/admin/data
3. Revoke Privileges (as an admin):
- Remove the test user’s elevated permissions.
- Example Linux command to revoke group access:
sudo deluser testuser admin
4. Re-Attempt Privileged API Calls:
- Check if the user can still access restricted endpoints.
- Example command to verify enforcement:
curl -X GET -H "Authorization: Bearer <token>" https://api.example.com/admin/data
5. Verify Session Handling:
- Some systems only enforce changes after a new login.
- Force a session logout and retest:
</li> </ul> <h1>Example: Revoke session token in a JWT-based system</h1> redis-cli SET "blacklist:<token>" "revoked" EX 3600
You Should Know:
- Session Persistence: Many systems cache permissions, requiring a logout/login cycle.
</li> </ul> <h1>Force session termination (Linux)</h1> sudo pkill -u testuser
- Database-Level Checks: Ensure backend APIs validate permissions on every request.
-- Example SQL to verify user role SELECT role FROM users WHERE user_id = 'testuser';
-
Logging & Monitoring: Track privilege changes and access attempts.
</p></li> </ul> <h1>Audit logs in Linux</h1> <p>sudo grep "user=testuser" /var/log/auth.log
- Automated Testing: Use scripts to detect orphaned privileges.
import requests headers = {"Authorization": "Bearer <token>"} response = requests.get("https://api.example.com/admin/data", headers=headers) print(response.status_code) # Should be 403 after revocation
What Undercode Say
Orphaned privileges are a dangerous oversight in access control. Always:
– Test revocation workflows thoroughly.
– Enforce server-side validation for every request.
– Monitor session states and permission changes.
– Automate security checks to catch misconfigurations.Expected Output:
A secure system where revoked permissions are immediately enforced, leaving no room for orphaned access.
Related Course: Weekly Pentest Tips & Tricks (120+ lessons)
References:
Reported By: Aaandrei %F0%9D%90%98%F0%9D%90%9E%F0%9D%90%AD – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅Join Our Cyber World:
- Automated Testing: Use scripts to detect orphaned privileges.
- Database-Level Checks: Ensure backend APIs validate permissions on every request.
- Session Persistence: Many systems cache permissions, requiring a logout/login cycle.
