CVE-2024-6636: WooCommerce Social Login Auth Bypass Flaw

CVE-2024-6636 Overview

CVE-2024-6636 is a critical authorization bypass vulnerability in the WooCommerce - Social Login plugin for WordPress. The vulnerability exists due to a missing capability check on the woo_slg_login_email function in all versions up to and including 2.7.3. This security flaw enables unauthenticated attackers to modify data without proper authorization, specifically allowing them to change the default user role to Administrator during the account registration process.

Critical Impact

Unauthenticated attackers can escalate privileges to Administrator level during account registration, potentially leading to complete WordPress site takeover.

Affected Products

• WPWebElite WooCommerce Social Login versions up to and including 2.7.3
• WordPress sites running vulnerable versions of the WooCommerce Social Login plugin

Discovery Timeline

• 2024-07-20 - CVE-2024-6636 published to NVD
• 2025-02-11 - Last updated in NVD database

Technical Details for CVE-2024-6636

Vulnerability Analysis

This vulnerability is classified as CWE-862 (Missing Authorization), representing a broken access control flaw where critical functionality lacks proper permission verification. The vulnerable woo_slg_login_email function processes user registration requests without validating whether the requester has the appropriate capabilities to modify user role assignments.

The attack can be executed remotely over the network without requiring any prior authentication or user interaction. This makes it particularly dangerous as attackers can exploit it directly from the internet without needing existing credentials or social engineering users into clicking malicious links.

When successfully exploited, attackers gain complete control over the affected WordPress installation with Administrator privileges, enabling them to modify site content, install malicious plugins, access sensitive data, create additional backdoor accounts, and potentially pivot to attack connected systems or databases.

Root Cause

The root cause of this vulnerability is a missing capability check in the woo_slg_login_email function. WordPress plugins should implement capability checks using functions like current_user_can() before allowing users to perform privileged operations. In this case, the plugin fails to verify that the user making the registration request has permission to assign Administrator roles, allowing any unauthenticated user to specify their desired role during the social login registration process.

Attack Vector

The attack is network-based and can be executed by unauthenticated users. An attacker can craft a malicious registration request targeting the woo_slg_login_email function and manipulate the role parameter to assign Administrator privileges to their newly created account. The attack requires no user interaction and can be automated for mass exploitation of vulnerable WordPress sites.

The vulnerability allows attackers to bypass the normal user registration workflow where role assignment is controlled by site administrators. By directly calling the vulnerable function with manipulated parameters, attackers can override the default user role setting and grant themselves the highest level of access to the WordPress installation.

Detection Methods for CVE-2024-6636

Indicators of Compromise

• Unexpected user accounts with Administrator privileges appearing in the WordPress user database
• New Administrator accounts created through the social login registration flow
• Unusual registration activity patterns or spikes in new Administrator account creation
• Login attempts from unfamiliar IP addresses using newly created Administrator accounts

Detection Strategies

• Monitor WordPress user creation events for accounts assigned Administrator role through non-standard methods
• Audit the wp_users and wp_usermeta tables for recently created accounts with wp_capabilities containing Administrator
• Review web server access logs for suspicious requests to WooCommerce Social Login endpoints
• Implement file integrity monitoring to detect unauthorized changes made by compromised Administrator accounts

Monitoring Recommendations

• Enable WordPress audit logging to track user registration events and role assignments
• Configure alerts for any new Administrator account creation outside of expected administrative workflows
• Monitor for plugin or theme installations from newly created accounts
• Review authentication logs for Administrator login attempts from unknown geographic locations

How to Mitigate CVE-2024-6636

Immediate Actions Required

• Update the WooCommerce Social Login plugin to a patched version beyond 2.7.3
• Audit all existing WordPress user accounts and remove any unauthorized Administrator accounts
• Review recent user registration activity for signs of exploitation
• Temporarily disable the WooCommerce Social Login plugin until the update can be applied

Patch Information

The vulnerability affects WooCommerce Social Login versions up to and including 2.7.3. Site administrators should update to the latest available version that addresses this authorization bypass. For detailed vulnerability information, refer to the Wordfence Vulnerability Report. The plugin is available through Codecanyon for licensed users.

Workarounds

• Disable the WooCommerce Social Login plugin entirely until a patch can be applied
• Implement a Web Application Firewall (WAF) rule to block requests to the vulnerable woo_slg_login_email function
• Configure WordPress to require Administrator approval for all new user registrations
• Restrict access to WordPress registration functionality at the server level if social login is not business-critical

# WordPress wp-config.php - Disable user registration as temporary mitigation
# Add the following line to wp-config.php
define('WP_DISABLE_REGISTRATION', true);

# Apache .htaccess rule to block access to vulnerable endpoint
# Add to .htaccess in WordPress root directory
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{QUERY_STRING} woo_slg_login_email [NC]
RewriteRule .* - [F,L]
</IfModule>