The WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN) plugin for WordPress is vulnerable to Authentication Bypass via OIDC Nonce Replay in all versions up to, and including, 44.1 This is due to Id_Token_Service_Deprecated::process_openidconnect_token() using the incompatible WordPress core wp_verify_nonce() function to validate a nonce produced by Nonce_Service::create_nonce() — a 64-character hex value that wp_verify_nonce() can never successfully verify — causing the nonce check to silently fail without terminating authentication, so execution continues into authenticate_oidc_user() with the attacker-supplied id_token. This makes it possible for unauthenticated attackers who have obtained a previously-issued, valid id_token for a target account to replay that token and authenticate as any WordPress user, including administrators, resulting in full site takeover. This vulnerability is only exploitable when the use_id_token_parser_v2 plugin option is enabled, as this is the configuration that routes token processing through the deprecated parser containing the broken nonce check.
Weakness
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
Potential Mitigations
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/114.html
- https://cwe.mitre.org/data/definitions/115.html
- https://cwe.mitre.org/data/definitions/151.html
- https://cwe.mitre.org/data/definitions/194.html
- https://cwe.mitre.org/data/definitions/22.html
- https://cwe.mitre.org/data/definitions/57.html
- https://cwe.mitre.org/data/definitions/593.html
- https://cwe.mitre.org/data/definitions/633.html
- https://cwe.mitre.org/data/definitions/650.html
- https://cwe.mitre.org/data/definitions/94.html
References
- https://plugins.trac.wordpress.org/browser/wpo365-login/tags/44.1/Services/Id_Token_Service.php#L107
- https://plugins.trac.wordpress.org/browser/wpo365-login/tags/44.1/Services/Id_Token_Service_Deprecated.php#L110
- https://plugins.trac.wordpress.org/browser/wpo365-login/tags/44.1/Services/Nonce_Service.php#L72
- https://plugins.trac.wordpress.org/browser/wpo365-login/tags/44.1/Services/Router_Service.php#L275
- https://plugins.trac.wordpress.org/changeset/3727410/wpo365-login
- https://plugins.trac.wordpress.org/changeset?reponame=\u0026new=3727410%40wpo365-login%2Ftags%2F45.0\u0026old=3682496%40wpo365-login%2Ftags%2F44.1
- https://www.wordfence.com/threat-intel/vulnerabilities/id/aad7ddac-ed12-4263-8e68-64b1fca8dfad?source=cve