Horizon Alert
Summary of the vulnerability and why it matters
This CVE describes a weakness in a Perl plugin used for time-based one-time password (TOTP) authentication. The issue involves how session cookies are handled, potentially allowing an attacker to bypass the limit on authentication attempts by replaying an old session cookie. This could impact systems relying on this specific plugin for second-factor authentication, although the actual risk depends on how the application manages session data.
- Authentication attempt limits can be bypassed.
- Consider if your systems use this authentication plugin.
- Confirm relevance and assess potential exposure.
Attack Path
How an attacker could exploit the issue
An attacker could exploit this vulnerability by tricking a user into revealing an earlier session cookie. This cookie would then be replayed to bypass the second-factor authentication attempt limit. The affected component is the Punk::Plugin::TOTP, a Perl plugin for time-based one-time password authentication. When session cookies are not stored server-side, replaying an older cookie with fewer recorded attempts can reset the failure counter, allowing an attacker to bypass the lockout mechanism.
- Requires an earlier session cookie.
- Attacker replays a valid, older session cookie.
- Bypasses second-factor authentication limits.
Live Threat
Current exploitation, exposure, and threat context
When Punk::Plugin::TOTP is configured to use session cookies for storing state, an attacker could bypass the second-factor authentication attempt limit by replaying an earlier, valid session cookie. This bypass is possible because the failure count is stored within the session itself, which can be manipulated if not managed server-side. This issue is only relevant when sessions are not explicitly configured with a server-side store.
- Second-factor authentication attempts.
- Replay of earlier session cookies.
- Bypass of login attempt limits.
Operational Fix
Recommended remediation, mitigation, and detection steps
Application owners responsible for Perl-based authentication systems should lead the response, coordinating with infrastructure and security teams. The first step is to identify all instances of the affected plugin, determine if sessions are stored server-side, and assess business criticality for prioritization.
- Identify accountable application owners.
- Verify session storage implementation.
- Plan remediation based on risk.
