Vulnerability in lynn999 EthPress – Web3 Login

[ Description ]Official description

The EthPress – Web3 Login plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 2.3.5. This is due to the verify_login() function in app/Login.php containing a missing return statement in the signature verification failure branch — when Signature::verify2() reports a mismatch, the function only assigns a WP_Error to a local variable and continues executing, causing unconditional fall-through to the login block where Address::log_in() calls wp_set_auth_cookie() regardless of whether the submitted signature is valid. This makes it possible for unauthenticated attackers to log in as any WordPress user who has a linked wallet address — including administrators — by submitting that user's public wallet address alongside an arbitrary well-formed signature, enabling full site takeover.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• plugins.trac.wordpress.org/browser/ethpress/tags/2.3.5/app/Address.php
• plugins.trac.wordpress.org/browser/ethpress/tags/2.3.5/app/Login.php
• plugins.trac.wordpress.org/browser/ethpress/tags/2.3.5/app/Login.php
• plugins.trac.wordpress.org/browser/ethpress/tags/2.3.5/app/Plugin.php
• plugins.trac.wordpress.org/changeset/3683106/ethpress/trunk/app/Login.php
• www.wordfence.com/threat-intel/vulnerabilities/id/267acbd7-379c-4930-aa85-3071dfcac5a5