CVE-2024-11617: Envolve Plugin WordPress RCE Vulnerability

CVE-2024-11617 Overview

CVE-2024-11617 is a critical arbitrary file upload vulnerability affecting the Envolve Plugin for WordPress. The vulnerability exists due to missing file type validation in the zetra_languageUpload and zetra_fontsUpload functions in all versions up to, and including, version 1.0. This security flaw enables unauthenticated attackers to upload arbitrary files to the affected site's server, potentially leading to remote code execution (RCE).

Critical Impact

Unauthenticated attackers can upload malicious files including PHP webshells to achieve remote code execution, leading to complete server compromise, data theft, and website defacement.

Affected Products

• Envolve Plugin for WordPress versions up to and including 1.0
• WordPress sites using the Envolve Consulting Business theme with the vulnerable plugin
• All WordPress installations with the affected plugin regardless of configuration

Discovery Timeline

• 2025-05-09 - CVE CVE-2024-11617 published to NVD
• 2025-05-12 - Last updated in NVD database

Technical Details for CVE-2024-11617

Vulnerability Analysis

This vulnerability falls under CWE-434 (Unrestricted Upload of File with Dangerous Type), one of the most severe classes of web application vulnerabilities. The Envolve Plugin implements two file upload functions—zetra_languageUpload and zetra_fontsUpload—that are designed to handle language files and font uploads respectively. However, these functions critically fail to implement proper file type validation.

Without authentication requirements or file type restrictions, any unauthenticated user can directly access these upload endpoints and submit arbitrary file types, including executable PHP scripts. Once uploaded, an attacker can access the malicious file through the web server to execute arbitrary code with the privileges of the web server process.

The network-accessible nature of this vulnerability combined with no required privileges or user interaction makes it trivially exploitable at scale. Successful exploitation grants attackers the ability to read, modify, or delete any data accessible to the web server, install backdoors for persistent access, pivot to other systems on the network, or use the compromised server for further attacks.

Root Cause

The root cause of this vulnerability is the absence of file type validation within the zetra_languageUpload and zetra_fontsUpload functions. These upload handlers do not verify that uploaded files conform to expected file types (such as language files with .json, .po, or .mo extensions, or font files with .woff, .ttf, or .otf extensions). Additionally, the functions lack any authentication checks, allowing unauthenticated users to invoke them directly. This combination of missing input validation and broken access control creates a straightforward path to remote code execution.

Attack Vector

The attack vector is network-based and requires no authentication, privileges, or user interaction. An attacker can exploit this vulnerability by crafting an HTTP POST request to one of the vulnerable upload endpoints (zetra_languageUpload or zetra_fontsUpload) with a malicious PHP file as the payload. Since no authentication is required and no file type checks are performed, the malicious file is written directly to the server's filesystem in a web-accessible directory.

The attacker then simply requests the uploaded file via HTTP to trigger execution of the malicious PHP code. This could include a webshell providing interactive command execution, automated scripts for data exfiltration, or cryptocurrency miners. For more technical details, refer to the Wordfence Vulnerability Report.

Detection Methods for CVE-2024-11617

Indicators of Compromise

• Unexpected PHP files or webshells in WordPress plugin upload directories, particularly in paths associated with the Envolve Plugin
• HTTP POST requests to endpoints containing zetra_languageUpload or zetra_fontsUpload with suspicious file payloads
• Newly created files with mismatched extensions (e.g., .php files in language or font directories)
• Unusual outbound network connections originating from the web server process
• Web server logs showing access to unfamiliar PHP files in plugin directories

Detection Strategies

• Monitor web server access logs for POST requests to Envolve Plugin upload endpoints from external or unknown IP addresses
• Implement file integrity monitoring (FIM) on WordPress installations to detect unauthorized file creation or modification
• Deploy web application firewalls (WAF) with rules to block suspicious file upload attempts containing PHP content
• Use security scanning tools to identify the presence of the vulnerable Envolve Plugin version
• Review access logs for sequential patterns of file upload followed by immediate GET requests to the same path

Monitoring Recommendations

• Enable detailed logging for WordPress AJAX handlers and custom plugin endpoints
• Configure alerts for file creation events within the wp-content/plugins/ directory hierarchy
• Implement network monitoring to detect unusual traffic patterns from web servers
• Regularly scan WordPress installations for known vulnerable plugins using security assessment tools
• Set up automated vulnerability scanning as part of continuous security monitoring practices

How to Mitigate CVE-2024-11617

Immediate Actions Required

• Deactivate and remove the Envolve Plugin immediately if version 1.0 or earlier is installed
• Conduct a thorough scan of the WordPress installation for suspicious files, particularly in plugin upload directories
• Review web server access logs for evidence of exploitation attempts
• If compromise is suspected, restore from a known-good backup and rotate all credentials
• Implement a web application firewall (WAF) to provide additional protection while remediation is completed

Patch Information

As of the last NVD update on 2025-05-12, no official patch has been released for this vulnerability. Website administrators should immediately remove or disable the Envolve Plugin until a patched version becomes available. Monitor the ThemeForest product page and the Wordfence Vulnerability Report for updates regarding security fixes.

Workarounds

• Remove or deactivate the Envolve Plugin entirely until a security patch is available from the vendor
• If removal is not immediately possible, restrict access to the vulnerable endpoints via web server configuration (see example below)
• Implement file upload restrictions at the web server level to block PHP files in upload directories
• Use security plugins such as Wordfence to monitor and block exploitation attempts
• Consider migrating to an alternative WordPress theme that does not require the vulnerable plugin

# Apache .htaccess configuration to block access to vulnerable endpoints
# Add to WordPress root .htaccess file

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{QUERY_STRING} action=zetra_languageUpload [NC,OR]
RewriteCond %{QUERY_STRING} action=zetra_fontsUpload [NC]
RewriteRule .* - [F,L]
</IfModule>

# Additionally, prevent PHP execution in upload directories
<Directory "/var/www/html/wp-content/uploads">
    <FilesMatch "\.php$">
        Deny from all
    </FilesMatch>
</Directory>