CVE-2024-8425: WooCommerce Ultimate Gift Card RCE Flaw

CVE-2024-8425 Overview

CVE-2024-8425 is a critical arbitrary file upload vulnerability in the WooCommerce Ultimate Gift Card plugin for WordPress. The vulnerability exists due to insufficient file type validation in the mwb_wgm_preview_mail and mwb_wgm_woocommerce_add_cart_item_data functions in all versions up to and including 2.6.0. This security flaw allows unauthenticated attackers to upload arbitrary files to the affected site's server, potentially leading to remote code execution.

Critical Impact

Unauthenticated attackers can upload malicious files including PHP web shells to vulnerable WordPress sites, enabling complete server compromise and remote code execution without any authentication.

Affected Products

• WPSwings WooCommerce Ultimate Gift Card versions up to and including 2.6.0
• WordPress sites running vulnerable versions of the plugin

Discovery Timeline

• 2025-02-28 - CVE-2024-8425 published to NVD
• 2025-03-06 - Last updated in NVD database

Technical Details for CVE-2024-8425

Vulnerability Analysis

This vulnerability is classified as CWE-434 (Unrestricted Upload of File with Dangerous Type). The WooCommerce Ultimate Gift Card plugin fails to properly validate file types during the upload process in two critical functions: mwb_wgm_preview_mail and mwb_wgm_woocommerce_add_cart_item_data.

The lack of authentication requirements combined with insufficient file type validation creates a severe attack surface. An attacker can exploit this vulnerability remotely over the network without any user interaction or prior authentication. The impact encompasses complete compromise of confidentiality, integrity, and availability of the affected WordPress installation.

Root Cause

The root cause of this vulnerability is inadequate input validation on file uploads within the plugin's gift card functionality. The affected functions do not properly restrict the types of files that can be uploaded, allowing attackers to bypass intended restrictions and upload executable files such as PHP scripts. This insufficient validation allows dangerous file types to be stored on the server in locations where they can be subsequently accessed and executed.

Attack Vector

The attack can be executed remotely over the network by unauthenticated attackers. The exploitation process involves:

1. An attacker identifies a WordPress site running a vulnerable version of the WooCommerce Ultimate Gift Card plugin
2. The attacker crafts a malicious request to either the mwb_wgm_preview_mail or mwb_wgm_woocommerce_add_cart_item_data function
3. Due to missing file type validation, the attacker uploads a malicious PHP file (such as a web shell)
4. The attacker accesses the uploaded file directly to execute arbitrary code on the server
5. With code execution achieved, the attacker gains full control over the WordPress installation and potentially the underlying server

The vulnerability requires no special privileges and no user interaction, making it highly exploitable. For detailed technical information, refer to the Wordfence Vulnerability Advisory.

Detection Methods for CVE-2024-8425

Indicators of Compromise

• Unexpected PHP files in WordPress upload directories, particularly with obfuscated names or random strings
• Web server access logs showing POST requests to gift card-related endpoints with file upload parameters
• Newly created files with execution capabilities in non-standard WordPress directories
• Unusual outbound network connections originating from the web server process

Detection Strategies

• Monitor WordPress upload directories for newly created PHP or executable files
• Implement file integrity monitoring to detect unauthorized file additions
• Review web application firewall (WAF) logs for suspicious file upload attempts targeting WooCommerce endpoints
• Audit access logs for requests to the mwb_wgm_preview_mail and mwb_wgm_woocommerce_add_cart_item_data functions containing file upload data

Monitoring Recommendations

• Enable detailed logging for all file upload operations within WordPress
• Configure real-time alerting for any PHP file creation in upload directories
• Implement endpoint detection and response (EDR) monitoring on web servers to detect web shell activity
• Regularly scan WordPress installations for known malicious file signatures and indicators of compromise

How to Mitigate CVE-2024-8425

Immediate Actions Required

• Update the WooCommerce Ultimate Gift Card plugin to a version newer than 2.6.0 immediately
• Audit WordPress upload directories for any suspicious or unexpected files
• Review web server logs for evidence of exploitation attempts
• Consider temporarily disabling the plugin if an update is not immediately available
• Implement a Web Application Firewall (WAF) rule to block file upload attempts to the affected endpoints

Patch Information

Site administrators should update the WooCommerce Ultimate Gift Card plugin to the latest available version. The plugin can be obtained from the CodeCanyon marketplace. Verify the installed version through the WordPress admin panel under Plugins and ensure it is newer than version 2.6.0.

Workarounds

• Deploy a Web Application Firewall (WAF) with rules to block suspicious file uploads to WordPress
• Restrict file permissions on WordPress upload directories to prevent execution of uploaded files
• Implement server-level configuration to disable PHP execution in upload directories using .htaccess or equivalent
• Use security plugins to monitor and restrict file upload capabilities until the official patch can be applied

# Apache configuration to prevent PHP execution in uploads directory
# Add to .htaccess in wp-content/uploads/
<FilesMatch "\.php$">
    Order Allow,Deny
    Deny from all
</FilesMatch>

# Alternative: Disable script execution entirely
php_flag engine off