Horizon Alert
Summary of the vulnerability and why it matters
A vulnerability in phpMyFAQ's two-factor authentication allows an attacker with valid credentials to bypass security limits by repeatedly resetting the authentication attempt counter, potentially enabling the guessing of one-time codes. This issue impacts web-based FAQ applications, which are often publicly accessible. The main concern is confirming relevance and exposure.
- Bypasses security checks on authentication.
- Allows code guessing for unauthorized access.
- Confirm relevance and exposure of this vulnerability.
Attack Path
How an attacker could exploit the issue
An attacker who possesses a valid user password could bypass security measures by repeatedly resetting the two-factor authentication attempt counter. This is achieved by exploiting a flaw where the counter is tied to a specific user session. By obtaining a new session cookie, the attacker can effectively reset the counter, allowing them to guess the correct two-factor code without limitation.
- Requires valid password.
- Resets counter with new session.
- Unbounded two-factor code guessing.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability could allow an unauthenticated attacker to bypass two-factor authentication through repeated attempts, potentially leading to unauthorized access to the application. This occurs when the failure counter for two-factor authentication is reset by obtaining a new session cookie, allowing for an unlimited number of guesses for the Time-based One-Time Password (TOTP) code.
- Access to the FAQ application.
- Repeatedly re-authenticating to reset the counter.
- Unauthorized access to the FAQ system.
Operational Fix
Recommended remediation, mitigation, and detection steps
phpMyFAQ is a web-based application, likely managed by application owners or a platform team, that requires an immediate review of its two-factor authentication implementation. The first critical step is to identify all instances of phpMyFAQ, determine their exposure, and confirm if they are business-critical, thereby assigning ownership for remediation planning.
- Identify affected phpMyFAQ deployments.
- Verify two-factor authentication reachability.
- Plan remediation based on risk.
