CVE-2024-7503: WooCommerce Social Login Auth Bypass Flaw

CVE-2024-7503 Overview

CVE-2024-7503 is a critical authentication bypass vulnerability in the WooCommerce - Social Login plugin for WordPress. The vulnerability exists in versions up to and including 2.7.5, allowing unauthenticated attackers to log in as any existing user on the site, including administrators. This flaw stems from the use of loose comparison of the activation code in the woo_slg_confirm_email_user function, which can be exploited when the email module is enabled.

Critical Impact

Unauthenticated attackers can gain full administrative access to WordPress sites by exploiting the loose comparison vulnerability, requiring only knowledge of a valid userID and the email module to be enabled.

Affected Products

• WooCommerce Social Login plugin versions up to and including 2.7.5
• WordPress installations with wpwebelite woocommerce_social_login plugin enabled
• Sites with the email confirmation module enabled

Discovery Timeline

• 2024-08-12 - CVE-2024-7503 published to NVD
• 2025-02-07 - Last updated in NVD database

Technical Details for CVE-2024-7503

Vulnerability Analysis

This authentication bypass vulnerability is classified under CWE-288 (Authentication Bypass Using an Alternate Path or Channel) and CWE-306 (Missing Authentication for Critical Function). The core issue lies in how the plugin validates user authentication during the email confirmation process. The woo_slg_confirm_email_user function uses PHP's loose comparison operator (==) instead of strict comparison (===) when verifying activation codes.

In PHP, loose comparison can lead to type juggling issues where different data types are compared in unexpected ways. When comparing certain values (such as 0 compared to a string), PHP's loose comparison can return true even when the values are not identical. This behavior allows attackers to craft requests that bypass the intended authentication checks.

The attack requires the email module to be enabled and knowledge of a valid userID on the target WordPress installation. Once these conditions are met, an attacker can construct a malicious request that passes the activation code validation despite not knowing the actual activation code, effectively gaining unauthorized access to any user account.

Root Cause

The root cause of this vulnerability is the use of loose comparison (==) instead of strict comparison (===) in PHP when validating the activation code parameter in the woo_slg_confirm_email_user function. This programming error allows type juggling attacks where an attacker can supply a specially crafted value that evaluates as equal to the stored activation code under PHP's loose comparison rules, bypassing the authentication mechanism entirely.

Attack Vector

The attack is network-based and requires no authentication or user interaction. An attacker can exploit this vulnerability remotely by sending specially crafted HTTP requests to the WordPress site. The attack flow involves:

1. Identifying a target WordPress site with the vulnerable WooCommerce Social Login plugin installed
2. Determining a valid userID (administrators are typically userID 1)
3. Crafting a request to the email confirmation endpoint with a payload that exploits PHP's loose comparison behavior
4. Bypassing authentication and gaining access to the targeted user account

The vulnerability mechanism exploits PHP's type juggling behavior in loose comparisons. When the activation code is compared using the loose equality operator, certain input values can match the stored code due to PHP's automatic type conversion. This allows attackers to authenticate without knowing the legitimate activation code. For detailed technical analysis, refer to the Wordfence Vulnerability Report.

Detection Methods for CVE-2024-7503

Indicators of Compromise

• Unexpected administrative account logins or session activity, particularly for userID 1
• Suspicious HTTP requests to email confirmation endpoints with unusual activation code parameters
• New administrator accounts or modified user privileges without authorized changes
• Log entries showing successful authentication without corresponding legitimate login attempts

Detection Strategies

• Monitor WordPress authentication logs for anomalous login patterns, especially for administrator accounts
• Implement Web Application Firewall (WAF) rules to detect and block requests with malformed activation codes
• Review access logs for unusual traffic patterns targeting the woo_slg_confirm_email_user endpoint
• Deploy endpoint detection to identify unauthorized privilege escalation attempts

Monitoring Recommendations

• Enable comprehensive WordPress authentication logging and regularly review for suspicious activity
• Configure real-time alerting for administrator-level account access from unexpected IP addresses or geographic locations
• Implement file integrity monitoring to detect unauthorized changes to WordPress core files, plugins, and user data
• Monitor for changes to user roles and capabilities within the WordPress database

How to Mitigate CVE-2024-7503

Immediate Actions Required

• Update the WooCommerce Social Login plugin to a version newer than 2.7.5 immediately
• Disable the email confirmation module temporarily if an immediate update is not possible
• Review all user accounts for unauthorized access or modifications, especially administrator accounts
• Reset passwords for all administrator accounts as a precautionary measure

Patch Information

The vulnerability affects WooCommerce Social Login plugin versions up to and including 2.7.5. Site administrators should update to the latest available version that addresses this authentication bypass issue. The plugin can be obtained from the Codecanyon Plugin Listing. For complete vulnerability details and remediation guidance, consult the Wordfence Vulnerability Report.

Workarounds

• Disable the WooCommerce Social Login email module until the plugin can be updated
• Implement additional access controls such as IP whitelisting for WordPress administrative functions
• Deploy a Web Application Firewall with rules to filter suspicious requests to the vulnerable endpoint
• Consider temporarily deactivating the plugin if critical operations do not depend on social login functionality

# Configuration example - Disable the email module via wp-cli
wp option update woo_slg_enable_email_verification 0

# Alternatively, rename the plugin directory to disable it temporarily
mv wp-content/plugins/woocommerce-social-login wp-content/plugins/woocommerce-social-login.disabled