Horizon Alert
Summary of the vulnerability and why it matters
This vulnerability in phpMyFAQ allows unauthenticated attackers to bypass two-factor authentication. By brute-forcing six-digit TOTP codes, attackers can gain administrative access to the system. This is concerning because it can lead to unauthorized control of your knowledge base.
- Attackers can gain full administrative access.
- Bypasses two-factor authentication.
- Reachable from the internet.
Attack Path
How an attacker could exploit the issue
An unauthenticated attacker can exploit this vulnerability by repeatedly POSTing to the `/admin/check` endpoint. They can bypass two-factor authentication by sending sequential six-digit TOTP codes and arbitrary user IDs, gaining full administrative access.
- No authentication required.
- Targets admin check endpoint.
- Brute-forces TOTP codes.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability allows unauthenticated attackers to bypass two-factor authentication and gain full administrative access by brute-forcing TOTP codes. The improper restriction of excessive authentication attempts in the `/admin/check` endpoint is particularly concerning due to the lack of session binding or rate limiting. While the vulnerability has been disclosed, there is no immediate indication of widespread exploitation or public exploits actively circulating, suggesting a potentially lower but still present threat.
- Exploitation requires targeting a specific endpoint.
- No public exploit code is available yet.
- Vulnerability affects administrative access.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
Prioritize blocking direct access to the `/admin/check` endpoint and implementing rate limiting for administrative login attempts. If your phpMyFAQ instance is internet-facing and allows administrative access, consider taking it offline temporarily until a patch can be applied. This vulnerability allows unauthenticated attackers to brute-force two-factor authentication codes, leading to administrative takeover.
- Apply phpMyFAQ version 4.1.2 or later.
- Implement firewall rules blocking the admin endpoint.
- Monitor for unusual POST requests to the admin endpoint.
