Two-Factor Authentication Bypass in WebAuthn Provider WordPress Plugin

Mitigation Strategies

The immediate step to mitigate this vulnerability is to update the WebAuthn Provider for Two Factor WordPress plugin to version 2.5.6 or later, where the issue has been fixed.

Until the update can be applied, consider temporarily disabling the plugin or enforcing additional authentication controls to prevent unauthorized access via 2FA bypass.

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Executive Summary

The WebAuthn Provider for Two Factor WordPress plugin versions below 2.5.6 contains a vulnerability that allows an attacker to bypass the two-factor authentication (2FA) process.

This happens because the plugin does not properly validate the second-factor authentication response. An attacker who already knows a user's password can exploit this by submitting a malformed request, which tricks the system into bypassing the 2FA requirement.

This vulnerability is classified as an authentication bypass and is considered high severity with a CVSS score of 7.2.

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Impact Analysis

If exploited, this vulnerability allows an attacker who already knows a user's password to bypass the two-factor authentication security layer.

This means the attacker can gain unauthorized access to the affected WordPress site or user account without needing the second authentication factor, increasing the risk of account compromise.

Such unauthorized access can lead to data breaches, unauthorized changes, or other malicious activities within the compromised account or system.

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Detection Guidance

This vulnerability involves bypassing the two-factor authentication by submitting a malformed second-factor authentication response. Detection would involve monitoring for unusual or malformed authentication requests to the WebAuthn Provider for Two Factor WordPress plugin, especially from users who have successfully entered their password but bypassed 2FA.

Specific commands or tools are not provided in the available resources. However, general approaches could include inspecting web server logs for suspicious authentication requests or using intrusion detection systems to flag malformed or unexpected authentication payloads targeting the plugin endpoints.

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