CVE-2024-52380: Picsmize File Upload RCE Vulnerability

CVE-2024-52380 Overview

CVE-2024-52380 is an Unrestricted Upload of File with Dangerous Type vulnerability (CWE-434) affecting the Picsmize WordPress plugin developed by softpulseinfotech. This vulnerability allows attackers to upload arbitrary files, including web shells, to the web server without proper validation or restrictions. Successful exploitation enables complete server compromise through remote code execution.

Critical Impact

Attackers can upload malicious web shells to gain persistent remote access, execute arbitrary commands, exfiltrate sensitive data, and potentially pivot to other systems within the network.

Affected Products

• Picsmize WordPress Plugin version 1.0.0 and earlier
• WordPress installations with the Picsmize plugin installed
• Web servers hosting vulnerable WordPress sites with this plugin

Discovery Timeline

• 2024-11-14 - CVE-2024-52380 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2024-52380

Vulnerability Analysis

The Picsmize WordPress plugin contains a critical file upload vulnerability that fails to properly validate or restrict the types of files that can be uploaded to the server. This flaw falls under CWE-434 (Unrestricted Upload of File with Dangerous Type), which occurs when an application allows users to upload files without adequate checks on the file type, content, or extension.

The vulnerability enables unauthenticated or low-privileged attackers to upload executable scripts, such as PHP web shells, directly to the web server. Once uploaded, these malicious files can be accessed via HTTP requests, allowing attackers to execute arbitrary commands with the privileges of the web server process. This is particularly dangerous in WordPress environments where file upload functionality is common but must be carefully controlled.

Root Cause

The root cause of this vulnerability lies in the insufficient file validation mechanisms within the Picsmize plugin's upload handling functionality. The plugin fails to implement proper server-side validation of uploaded file types, relying either on client-side checks that can be easily bypassed or on inadequate file extension filtering. Without proper MIME type verification, content inspection, and allowlist-based file type restrictions, attackers can upload dangerous executable files that the server will subsequently process.

Attack Vector

The attack requires network access to the vulnerable WordPress installation. An attacker can craft a malicious file, such as a PHP web shell, and submit it through the Picsmize plugin's file upload interface. The lack of proper file type validation allows the dangerous file to be saved to the web server's file system. The attacker can then access the uploaded file directly through its URL, triggering server-side execution of the malicious code.

The exploitation typically follows this pattern: the attacker identifies the upload endpoint, prepares a web shell payload (commonly disguised with double extensions or null bytes), uploads the payload through the vulnerable interface, and then accesses the uploaded file to gain remote command execution capabilities on the target server.

Detection Methods for CVE-2024-52380

Indicators of Compromise

• Presence of unexpected PHP, PHTML, or other executable files in WordPress upload directories
• Web server logs showing POST requests to Picsmize plugin upload endpoints followed by GET requests to unusual file paths
• New or modified files with suspicious names in /wp-content/uploads/ or plugin-specific directories
• Outbound connections or unusual process spawning from the web server process

Detection Strategies

• Monitor file system changes in WordPress upload directories for new executable files (.php, .phtml, .php5, etc.)
• Implement web application firewall (WAF) rules to detect and block web shell upload attempts
• Review Apache/Nginx access logs for suspicious POST requests to plugin endpoints followed by requests to newly created files
• Deploy file integrity monitoring (FIM) solutions to alert on unexpected file creations in web-accessible directories

Monitoring Recommendations

• Enable detailed logging on the WordPress installation and review upload-related activities
• Configure alerts for any new PHP files created in upload directories
• Monitor for known web shell signatures and behaviors on the server
• Implement network-level monitoring for command-and-control traffic patterns typical of web shell activity

How to Mitigate CVE-2024-52380

Immediate Actions Required

• Immediately deactivate and remove the Picsmize plugin from all WordPress installations
• Audit upload directories for any suspicious or unexpected files and remove unauthorized content
• Review web server access logs for signs of exploitation or web shell access
• Consider restoring from a known-good backup if compromise is suspected
• Implement restrictive file upload policies at the web server level as an additional defense layer

Patch Information

As of the available information, the Picsmize plugin versions through 1.0.0 remain vulnerable. Site administrators should remove the plugin entirely until a patched version is released by the developer. Monitor the Patchstack WordPress Vulnerability Advisory for updates on remediation status.

Workarounds

• Remove or deactivate the Picsmize plugin immediately if patching is not available
• Implement server-level restrictions to prevent execution of PHP files in upload directories
• Configure .htaccess rules to deny direct access to uploaded files or disable script execution
• Use a Web Application Firewall (WAF) to block suspicious file upload requests
• Restrict file upload permissions to authenticated administrators only through WordPress role management

# Apache configuration to prevent PHP execution in uploads directory
# Add to .htaccess in /wp-content/uploads/
<FilesMatch "\.(?:php|phtml|php5|php7|phps)$">
    Require all denied
</FilesMatch>

# Alternative: Disable PHP engine entirely for uploads
php_flag engine off