CVE-2024-12264: PayU CommercePro Privilege Escalation

CVE-2024-12264 Overview

CVE-2024-12264 is a critical privilege escalation vulnerability affecting the PayU CommercePro Plugin for WordPress. The vulnerability exists in all versions up to and including 3.8.3, where the plugin's REST API endpoints fail to properly verify user identity before setting user IDs and authentication cookies. This authentication bypass flaw allows unauthenticated attackers to create new administrative user accounts, effectively granting them complete control over the affected WordPress installation.

Critical Impact

Unauthenticated attackers can exploit this vulnerability to create administrative accounts, leading to complete WordPress site compromise with full administrative privileges.

Affected Products

• PayU CommercePro Plugin for WordPress versions up to and including 3.8.3
• WordPress installations utilizing the PayU CommercePro Plugin (payu-india)

Discovery Timeline

• 2025-01-07 - CVE-2024-12264 published to NVD
• 2025-01-07 - Last updated in NVD database

Technical Details for CVE-2024-12264

Vulnerability Analysis

This vulnerability is classified as CWE-287 (Improper Authentication) and affects the PayU CommercePro Plugin's REST API implementation. The plugin exposes two vulnerable REST API endpoints: /wp-json/payu/v1/generate-user-token and /wp-json/payu/v1/get-shipping-cost. These endpoints are designed to handle user token generation and shipping cost calculations but fail to implement adequate authentication checks.

The core issue lies in the class-payu-shipping-tax-api-calculation.php file, specifically around line 187, where the REST API handlers process incoming requests without properly validating the requester's identity. When these endpoints are invoked, they set user IDs and authentication cookies without verifying that the request originates from a legitimate, authenticated user. This allows unauthenticated attackers to manipulate the authentication flow and create administrative accounts.

Root Cause

The root cause of this vulnerability is improper authentication verification in the REST API endpoint handlers. The plugin's code does not validate the authenticity or authorization level of incoming API requests before performing sensitive operations like setting user authentication cookies. This represents a fundamental security design flaw where privileged operations are exposed through unauthenticated API endpoints.

Attack Vector

The attack can be executed remotely over the network without any prior authentication or user interaction. An attacker can send specially crafted HTTP requests to the vulnerable REST API endpoints (/wp-json/payu/v1/generate-user-token or /wp-json/payu/v1/get-shipping-cost) on a WordPress site running the vulnerable plugin version. By manipulating the request parameters, the attacker can trick the plugin into creating authentication cookies for a new administrative account or elevating privileges of an existing user account.

The attack is particularly dangerous because:

• No authentication is required to exploit the vulnerability
• The attack can be automated and executed against multiple targets
• Successful exploitation grants complete administrative control over the WordPress site

For detailed technical analysis of the vulnerable code, see the WordPress Plugin Code Review and the Wordfence Vulnerability Report.

Detection Methods for CVE-2024-12264

Indicators of Compromise

• Unexpected new administrator accounts appearing in WordPress user management
• Suspicious HTTP POST requests to /wp-json/payu/v1/generate-user-token or /wp-json/payu/v1/get-shipping-cost endpoints from external IP addresses
• Anomalous authentication cookies being set without corresponding login activities
• New user registrations with administrative privileges that were not created through normal processes

Detection Strategies

• Monitor WordPress access logs for requests to the vulnerable REST API endpoints, particularly from unauthenticated sources
• Implement Web Application Firewall (WAF) rules to detect and block suspicious requests to /wp-json/payu/v1/generate-user-token and /wp-json/payu/v1/get-shipping-cost
• Deploy file integrity monitoring to detect unauthorized modifications to WordPress core files or plugin configurations
• Enable WordPress audit logging to track user creation events and privilege changes

Monitoring Recommendations

• Configure real-time alerting for new administrator account creation in WordPress
• Set up anomaly detection for unusual REST API request patterns targeting the PayU plugin endpoints
• Review WordPress user accounts regularly to identify unauthorized administrative users
• Monitor server logs for suspicious POST requests containing user token or authentication cookie manipulation attempts

How to Mitigate CVE-2024-12264

Immediate Actions Required

• Update the PayU CommercePro Plugin to a version newer than 3.8.3 that includes the security fix
• Audit all existing WordPress administrator accounts and remove any unauthorized users
• Reset authentication cookies and force re-authentication for all legitimate administrative users
• If update is not immediately possible, consider temporarily disabling the PayU CommercePro Plugin until a patched version can be deployed

Patch Information

Organizations should update the PayU CommercePro Plugin through the WordPress plugin update mechanism to obtain the latest security patches. Check the WordPress plugin repository for versions newer than 3.8.3 that address this vulnerability. For the most current information, consult the Wordfence Vulnerability Report.

Workarounds

• Implement WAF rules to block unauthenticated requests to /wp-json/payu/v1/generate-user-token and /wp-json/payu/v1/get-shipping-cost endpoints
• Restrict access to the WordPress REST API using server-level access controls or .htaccess rules
• Temporarily disable the PayU CommercePro Plugin if it is not critical to business operations until patching is complete
• Use a security plugin to add additional authentication layers to REST API endpoints

# Apache .htaccess rule to block access to vulnerable endpoints
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/wp-json/payu/v1/(generate-user-token|get-shipping-cost) [NC]
RewriteRule .* - [F,L]
</IfModule>