CVE-2024-56046: WPLMS WordPress Plugin RCE Vulnerability

CVE-2024-56046 Overview

CVE-2024-56046 is a critical unrestricted file upload vulnerability affecting the WPLMS WordPress plugin developed by VibeThemes. This vulnerability allows unauthenticated attackers to upload arbitrary files, including web shells, to vulnerable WordPress installations. The WPLMS plugin is a popular learning management system used by educational institutions and online course providers, making this vulnerability particularly concerning due to its potential for widespread exploitation.

Critical Impact

Unauthenticated attackers can upload malicious web shells to gain complete control over affected WordPress servers, potentially leading to data theft, website defacement, and further network compromise.

Affected Products

• VibeThemes WPLMS Plugin versions up to and including 1.9.9
• WordPress Learning Management System (WPLMS) WordPress plugin
• All WordPress installations running vulnerable WPLMS plugin versions

Discovery Timeline

• 2024-12-31 - CVE-2024-56046 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2024-56046

Vulnerability Analysis

This vulnerability falls under CWE-434 (Unrestricted Upload of File with Dangerous Type), representing a severe security flaw in the file upload functionality of the WPLMS plugin. The vulnerable component fails to properly validate or restrict the types of files that can be uploaded by users. What makes this particularly dangerous is that no authentication is required to exploit the vulnerability—any remote attacker with network access to the WordPress installation can attempt to upload malicious files.

The attack can be executed remotely over the network with low complexity, requiring no privileges or user interaction. Successful exploitation grants attackers the ability to execute arbitrary code on the server with the same privileges as the web server process, typically resulting in complete compromise of the WordPress installation and potentially the underlying server.

Root Cause

The root cause of CVE-2024-56046 lies in the WPLMS plugin's failure to implement proper file type validation and access controls on its upload functionality. The plugin does not adequately verify that uploaded files contain only permitted content types, nor does it restrict the upload endpoint to authenticated users. This combination allows attackers to bypass intended security restrictions and upload executable files such as PHP web shells directly to the web server's document root.

Attack Vector

The attack vector for this vulnerability is network-based, allowing remote exploitation without any authentication. An attacker can craft a malicious HTTP request containing a PHP web shell or other dangerous file type and submit it to the vulnerable upload endpoint in the WPLMS plugin. Once uploaded, the attacker can access the malicious file via a web browser to execute arbitrary commands on the server.

The exploitation process typically involves:

1. Identifying a WordPress installation with the vulnerable WPLMS plugin
2. Crafting a multipart/form-data POST request with a malicious PHP payload
3. Submitting the request to the vulnerable upload endpoint
4. Accessing the uploaded web shell to gain command execution capabilities

For detailed technical information about this vulnerability, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2024-56046

Indicators of Compromise

• Presence of unexpected PHP files in WordPress upload directories, particularly in /wp-content/uploads/ or plugin-specific directories
• Web server logs showing POST requests to WPLMS plugin upload endpoints from suspicious IP addresses
• Unusual outbound network connections from the web server process
• New or modified files with recent timestamps in plugin directories
• Evidence of command execution in web server error logs

Detection Strategies

• Monitor WordPress upload directories for newly created PHP files or files with double extensions (e.g., .php.jpg)
• Implement Web Application Firewall (WAF) rules to detect and block file upload attempts containing PHP code
• Configure file integrity monitoring on WordPress installations to alert on unauthorized file changes
• Review web server access logs for unusual POST requests to WPLMS plugin endpoints

Monitoring Recommendations

• Enable detailed logging for all file upload operations on WordPress servers
• Deploy intrusion detection systems (IDS) to monitor for web shell signatures and suspicious file uploads
• Implement real-time alerting for any PHP file creation in upload directories
• Regularly audit WordPress plugin versions and compare against known vulnerable versions

How to Mitigate CVE-2024-56046

Immediate Actions Required

• Update the WPLMS plugin to a version newer than 1.9.9 that contains a patch for this vulnerability
• Audit WordPress upload directories for any suspicious files that may have been uploaded prior to patching
• Review web server access logs for signs of exploitation attempts
• Consider temporarily disabling the WPLMS plugin until a patch can be applied if immediate update is not possible
• Implement network-level restrictions to limit access to WordPress admin and upload functionality

Patch Information

VibeThemes has been notified of this vulnerability. Website administrators should check for plugin updates through the WordPress admin dashboard or the official VibeThemes website for a patched version of the WPLMS plugin. Ensure the installed version is greater than 1.9.9 to remediate this vulnerability.

For additional details, consult the Patchstack Vulnerability Report.

Workarounds

• Implement server-side file upload restrictions using .htaccess rules to prevent PHP execution in upload directories
• Deploy a Web Application Firewall (WAF) with rules to block malicious file uploads
• Restrict direct access to the WPLMS plugin upload endpoints via web server configuration
• Consider using WordPress security plugins that provide file upload scanning and blocking capabilities

# Apache .htaccess configuration to prevent PHP execution in uploads directory
# Add this to /wp-content/uploads/.htaccess
<FilesMatch "\.(?i:php|php3|php4|php5|phtml)$">
    Require all denied
</FilesMatch>

# Nginx configuration alternative
# Add to server block
location ~* /wp-content/uploads/.*\.php$ {
    deny all;
}