CVE-2023-4238
📋 TL;DR
This vulnerability in the Prevent files / folders access WordPress plugin allows attackers to upload arbitrary files, including malicious PHP scripts, to the server without proper validation. It affects WordPress sites using vulnerable versions of this plugin. Attackers could gain remote code execution capabilities.
💻 Affected Systems
- WordPress Prevent files / folders access plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise leading to data theft, ransomware deployment, or website defacement through remote code execution.
Likely Case
Attackers upload web shells to gain persistent access, steal sensitive data, or use the server for malicious activities.
If Mitigated
Limited impact with proper file upload restrictions and web application firewalls in place.
🎯 Exploit Status
Exploitation requires attacker access to file upload functionality, typically through authenticated user interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.5.2
Vendor Advisory: https://wpscan.com/vulnerability/53816136-4b1a-4b7d-b73b-08a90c2a638f
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'Prevent files / folders access' plugin. 4. Click 'Update Now' if update available. 5. If no update appears, manually update to version 2.5.2 or later.
🔧 Temporary Workarounds
Disable vulnerable plugin
allTemporarily deactivate the plugin until patched version is available.
wp plugin deactivate prevent-files-folders-access
Restrict file uploads via .htaccess
linuxBlock execution of uploaded PHP files in upload directories.
Add to .htaccess in wp-content/uploads: <Files *.php> deny from all </Files>
🧯 If You Can't Patch
- Implement strict file upload validation at web server level
- Deploy web application firewall with file upload protection rules
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Prevent files / folders access > Version number. If version is below 2.5.2, system is vulnerable.Check Version:
wp plugin list --name='prevent-files-folders-access' --field=versionVerify Fix Applied:
Confirm plugin version is 2.5.2 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to wp-content/uploads directory
- POST requests to plugin file upload endpoints with PHP extensions
Network Indicators:
- HTTP POST requests containing PHP file content to upload endpoints
SIEM Query:
source="web_server" (method="POST" AND uri="*prevent-files-folders-access*" AND (extension="php" OR content="<?php"))