CVE-2024-11613
📋 TL;DR
This vulnerability in the WordPress File Upload plugin allows unauthenticated attackers to execute arbitrary code, read sensitive files, and delete files on affected WordPress sites. All WordPress sites using the plugin version 4.24.15 or earlier are affected. The issue stems from insufficient input validation in the wfu_file_downloader.php file.
💻 Affected Systems
- WordPress File Upload plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise leading to data theft, ransomware deployment, website defacement, and lateral movement to other systems.
Likely Case
Website defacement, data exfiltration, malware installation, and unauthorized access to sensitive files.
If Mitigated
Limited impact due to network segmentation, file integrity monitoring, and restricted file permissions.
🎯 Exploit Status
The vulnerability is easily exploitable with publicly available proof-of-concept code.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.24.16 or later
Vendor Advisory: https://plugins.trac.wordpress.org/changeset/3217005/
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'WordPress File Upload' and click 'Update Now'. 4. Verify version is 4.24.16 or higher.
🔧 Temporary Workarounds
Disable vulnerable file
linuxTemporarily disable the vulnerable wfu_file_downloader.php file
mv /path/to/wp-content/plugins/wp-file-upload/wfu_file_downloader.php /path/to/wp-content/plugins/wp-file-upload/wfu_file_downloader.php.disabled
Web server block
allBlock access to the vulnerable file via web server configuration
<LocationMatch "wfu_file_downloader\.php">
Order deny,allow
Deny from all
</LocationMatch>
🧯 If You Can't Patch
- Immediately disable the WordPress File Upload plugin entirely
- Implement web application firewall rules to block requests to wfu_file_downloader.php
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → Installed Plugins for WordPress File Upload version. If version is 4.24.15 or lower, you are vulnerable.Check Version:
grep -r "Version:" /path/to/wp-content/plugins/wp-file-upload/wp-file-upload.php | head -1Verify Fix Applied:
After updating, verify the plugin version shows 4.24.16 or higher in WordPress admin.📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /wp-content/plugins/wp-file-upload/wfu_file_downloader.php with suspicious parameters
- Unusual file operations in WordPress upload directories
- PHP execution errors in web server logs
Network Indicators:
- POST/GET requests to wfu_file_downloader.php with source parameter containing directory traversal patterns
- Unusual outbound connections from web server
SIEM Query:
source="web_server_logs" AND uri="*wfu_file_downloader.php*" AND (param="*../*" OR param="*..\\*" OR param="*php://*" OR param="*data://*")