Time-of-Use Bypass in WP 2FA WordPress Plugin

Executive Summary

The WP 2FA WordPress plugin before version 4.1.0 has a flaw where it does not invalidate a time-based one-time passcode (TOTP) after use. This allows an attacker who knows a user's password and has seen a valid TOTP code within its validity window to replay that code and bypass two-factor authentication, even for administrator accounts.

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Detection Guidance

Check the installed version of the WP 2FA plugin. If it is below 4.1.0, the system is vulnerable. This can be done by inspecting the plugin files or using WordPress admin panel to view the plugin version.

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Impact Analysis

If you use the WP 2FA plugin version below 4.1.0, an attacker could bypass your two-factor authentication by replaying a previously used TOTP code. This means they could gain unauthorized access to your account even if you have 2FA enabled, potentially leading to data theft, unauthorized actions, or full account compromise.

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Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, which may violate compliance requirements such as GDPR (data protection) or HIPAA (health information security). Organizations using the affected plugin versions may face legal and regulatory penalties due to insufficient authentication controls.

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Mitigation Strategies

Update the WP 2FA plugin to version 4.1.0 or later immediately to patch the vulnerability. If updating is not possible, consider disabling the plugin temporarily until an update is applied.

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