CVE-2024-10820: WooCommerce Upload Files RCE Vulnerability

CVE-2024-10820 Overview

CVE-2024-10820 is a critical arbitrary file upload vulnerability in the WooCommerce Upload Files plugin for WordPress. The vulnerability exists due to missing file type validation in the upload_files() function, allowing unauthenticated attackers to upload arbitrary files to the affected site's server. This flaw can be exploited to achieve remote code execution on vulnerable WordPress installations.

Critical Impact

Unauthenticated attackers can upload malicious files including web shells and backdoors, potentially leading to complete site compromise and remote code execution.

Affected Products

• WooCommerce Upload Files plugin version 84.3 and earlier
• All WordPress installations using the vulnerable plugin versions
• Vanquish WooCommerce Upload Files

Discovery Timeline

• 2024-11-13 - CVE-2024-10820 published to NVD
• 2024-11-19 - Last updated in NVD database

Technical Details for CVE-2024-10820

Vulnerability Analysis

This vulnerability is classified as CWE-434 (Unrestricted Upload of File with Dangerous Type). The WooCommerce Upload Files plugin fails to properly validate file types during the upload process, creating a significant security gap that can be exploited remotely without any authentication requirements.

The vulnerability is particularly severe because it requires no user interaction and can be exploited over the network. An attacker with no privileges can successfully upload malicious files, potentially gaining complete control over the affected WordPress installation. The impact spans all three security pillars—confidentiality, integrity, and availability—making this a full-impact vulnerability.

Root Cause

The root cause of CVE-2024-10820 lies in the upload_files() function within the WooCommerce Upload Files plugin. This function lacks proper file type validation checks, allowing users to upload files with any extension, including executable scripts such as PHP files. Without proper validation, attackers can bypass intended restrictions and upload web shells or other malicious payloads.

Attack Vector

The attack vector for this vulnerability is network-based, requiring no authentication or user interaction. An attacker can craft a malicious HTTP request to the vulnerable endpoint, uploading a PHP web shell or other malicious file directly to the server. Once uploaded, the attacker can access the malicious file via a direct URL to execute arbitrary commands on the server.

The exploitation process typically follows these steps:

1. The attacker identifies a WordPress site running a vulnerable version of the WooCommerce Upload Files plugin
2. A crafted request is sent to the upload endpoint with a malicious file (e.g., PHP web shell)
3. Due to missing file type validation, the file is accepted and stored on the server
4. The attacker accesses the uploaded file directly, triggering code execution
5. Full server compromise is achieved through the executed malicious code

For detailed technical information, refer to the Wordfence Vulnerability Report.

Detection Methods for CVE-2024-10820

Indicators of Compromise

• Unexpected PHP files or web shells appearing in WordPress upload directories
• Unusual HTTP POST requests to WooCommerce file upload endpoints
• New files with suspicious extensions (.php, .phtml, .php5) in upload folders
• Abnormal outbound network connections from the web server
• Evidence of unauthorized command execution in server logs

Detection Strategies

• Monitor WordPress upload directories for newly created PHP or executable files
• Implement Web Application Firewall (WAF) rules to detect file upload abuse patterns
• Review web server access logs for suspicious POST requests targeting the plugin's upload functionality
• Deploy file integrity monitoring on WordPress installations to detect unauthorized file changes
• Scan for known web shell signatures in the uploads directory

Monitoring Recommendations

• Enable detailed logging for all file upload operations on WordPress sites
• Configure alerts for the creation of executable files in web-accessible directories
• Implement real-time monitoring of the wp-content/uploads/ directory structure
• Set up notifications for any files uploaded with double extensions or executable MIME types
• Regularly audit plugin versions and compare against known vulnerable releases

How to Mitigate CVE-2024-10820

Immediate Actions Required

• Update the WooCommerce Upload Files plugin to a version newer than 84.3 immediately
• Audit the WordPress uploads directory for any suspicious or unauthorized files
• Review server access logs for evidence of exploitation attempts
• Consider temporarily disabling the plugin until a patch can be applied
• Implement web application firewall rules to block malicious file uploads

Patch Information

The vulnerability affects all versions of the WooCommerce Upload Files plugin up to and including version 84.3. Site administrators should update to the latest available version from the official source. For more information about the plugin, visit the CodeCanyon WooCommerce Add-on page.

Workarounds

• Implement server-level file type restrictions to block PHP and other executable uploads
• Configure .htaccess rules to prevent PHP execution in the uploads directory
• Use a WAF to filter and block requests containing executable file uploads
• Temporarily disable file upload functionality in the plugin settings if available
• Restrict direct access to the uploads directory through server configuration

# Apache .htaccess configuration to prevent PHP execution in uploads directory
# Place this file in wp-content/uploads/

<FilesMatch "\.(?:php[1-7]?|phtml|phar)$">
    Require all denied
</FilesMatch>

# Alternative for older Apache versions
<FilesMatch "\.(?:php[1-7]?|phtml|phar)$">
    Order Allow,Deny
    Deny from all
</FilesMatch>