Authentication Bypass via SAML in Frontegg WordPress Plugin

Executive Summary

The Frontegg SAML SSO WordPress plugin through version 1.0.1 has a critical flaw where it does not verify the signature or issuer of SAML authentication responses. This allows unauthenticated attackers to bypass login mechanisms and gain access to any user account, including administrators, or create new accounts without credentials.

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Detection Guidance

Detecting this vulnerability requires checking if the Frontegg SAML SSO WordPress plugin version 1.0.1 or below is installed. Inspect WordPress plugins via the admin dashboard or use commands like 'wp plugin list' in the WordPress directory. Verify if SAML responses are being logged or monitored for missing signature or issuer validation.

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Impact Analysis

This vulnerability enables attackers to take over any user account on your WordPress site, including admin accounts, without needing valid credentials. They can also create new accounts with full access, leading to complete site compromise, data theft, or malicious actions being performed under your identity.

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Compliance Impact

This vulnerability severely impacts compliance with GDPR and HIPAA by allowing unauthorized access to sensitive user data. It violates principles of data protection, access control, and authentication, potentially leading to regulatory fines, legal liabilities, and loss of trust due to unauthorized data exposure or breaches.

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Mitigation Strategies

Immediately disable the Frontegg SAML SSO WordPress plugin if installed. Monitor for unauthorized account creation or login attempts. Check for suspicious admin accounts or new user registrations without credentials.

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