CVE-2024-9501: WordPress Social Login Auth Bypass Flaw

CVE-2024-9501 Overview

CVE-2024-9501 is an authentication bypass vulnerability affecting the Wp Social Login and Register Social Counter plugin for WordPress in all versions up to and including 3.0.7. The vulnerability stems from insufficient verification on the user being returned by the social login token, allowing unauthenticated attackers to log in as any existing user on the site, including administrators, if they have access to the email and the user does not have an already-existing account for the service returning the token.

Critical Impact

Unauthenticated attackers can gain complete administrative access to vulnerable WordPress sites, potentially leading to full site takeover, data theft, malware injection, and defacement.

Affected Products

• Wp Social Login and Register Social Counter plugin for WordPress versions up to and including 3.0.7
• WordPress installations utilizing vulnerable versions of the plugin for social authentication

Discovery Timeline

• October 26, 2024 - CVE-2024-9501 published to NVD
• October 28, 2024 - Last updated in NVD database

Technical Details for CVE-2024-9501

Vulnerability Analysis

This authentication bypass vulnerability (CWE-288: Authentication Bypass Using an Alternate Path or Channel) allows attackers to circumvent the normal authentication process entirely. The vulnerable code resides in the user creation and authentication logic within admin-create-user.php. When a social login token is processed, the plugin fails to adequately verify that the user being authenticated actually owns the social account associated with the returned token.

The attack scenario requires the attacker to know the email address of a target user (such as an administrator) who does not have a pre-existing account linked to the social login service being exploited. Under these conditions, an attacker can leverage the social login flow to authenticate as the target user, gaining their full privileges on the WordPress site.

Root Cause

The root cause lies in insufficient verification logic during the social login authentication process. The plugin trusts the email address returned by the social login provider without properly validating that the requesting user legitimately controls that social account. This lack of proper token-to-user binding creates a path where attackers can manipulate the authentication flow to impersonate legitimate users.

Attack Vector

The attack is network-based and requires no prior privileges or user interaction. An attacker can exploit this vulnerability remotely by:

1. Identifying a target WordPress site using the vulnerable plugin
2. Obtaining the email address of an administrator or privileged user
3. Initiating a social login flow and manipulating the token verification process
4. Gaining authenticated access as the target user without proper credential verification

The vulnerability in the user creation logic can be examined through the WordPress User Creation Code in the plugin's source repository. The fix implemented in WordPress Changeset 3173675 addresses the insufficient token verification that enabled this bypass.

Detection Methods for CVE-2024-9501

Indicators of Compromise

• Unexpected administrative user sessions or login events without corresponding valid credential use
• Authentication logs showing social login authentications for users who do not typically use social login
• New administrator accounts or privilege escalations without authorized changes
• Unusual activity in WordPress admin areas from unfamiliar IP addresses or geolocations

Detection Strategies

• Monitor WordPress authentication logs for social login events targeting administrator accounts
• Implement alerting on administrative privilege usage patterns that deviate from baselines
• Review web server access logs for suspicious requests to social login callback endpoints
• Deploy web application firewall rules to detect anomalous OAuth/social authentication flows

Monitoring Recommendations

• Enable comprehensive WordPress audit logging including all authentication events
• Configure alerts for any administrative login via social authentication mechanisms
• Monitor for mass authentication attempts using social login endpoints
• Implement real-time monitoring of user privilege changes and new account creations

How to Mitigate CVE-2024-9501

Immediate Actions Required

• Update the Wp Social Login and Register Social Counter plugin to version 3.0.8 or later immediately
• Audit all administrator and privileged user accounts for unauthorized access
• Review recent login activity for any suspicious social login authentications
• Consider temporarily disabling social login functionality until the update is applied

Patch Information

The vulnerability has been addressed in the plugin update. The fix is documented in WordPress Changeset 3173675 and implements proper verification of the user associated with social login tokens. Additional technical analysis is available from Wordfence Vulnerability Analysis.

Workarounds

• Disable the Wp Social Login and Register Social Counter plugin entirely until patching is possible
• Implement additional authentication requirements for administrative accounts (such as two-factor authentication)
• Restrict administrative login access to trusted IP addresses using .htaccess or security plugins
• Monitor authentication logs closely for any signs of exploitation attempts

# Disable the vulnerable plugin via WP-CLI
wp plugin deactivate wp-social

# Verify current plugin version
wp plugin get wp-social --field=version

# Update to patched version
wp plugin update wp-social