CVE-2024-11635
📋 TL;DR
This vulnerability allows unauthenticated attackers to execute arbitrary code on WordPress servers running the vulnerable File Upload plugin. All WordPress sites using this plugin up to version 4.24.12 are affected, potentially compromising the entire server.
💻 Affected Systems
- WordPress File Upload plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete server takeover, data exfiltration, ransomware deployment, and lateral movement to other systems in the network.
Likely Case
Website defacement, malware installation, credential theft, and backdoor persistence on the compromised server.
If Mitigated
Limited impact if proper network segmentation, web application firewalls, and least privilege principles are implemented.
🎯 Exploit Status
Exploitation is trivial via cookie manipulation. Public exploit code is available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.24.13 and later
Vendor Advisory: https://plugins.trac.wordpress.org/changeset/3158986/wp-file-upload/trunk/wfu_file_downloader.php
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins. 3. Find 'WordPress File Upload'. 4. Click 'Update Now' if available. 5. Alternatively, download version 4.24.13+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Disable vulnerable plugin
linuxTemporarily disable the WordPress File Upload plugin until patched
mv /path/to/wp-content/plugins/wp-file-upload /path/to/wp-content/plugins/wp-file-upload.disabled
Web Application Firewall rule
allBlock requests containing the malicious 'wfu_ABSPATH' cookie parameter
🧯 If You Can't Patch
- Implement strict network segmentation to isolate WordPress server from critical assets
- Deploy a web application firewall with rules to detect and block exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > WordPress File Upload version. If version is 4.24.12 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:
Verify plugin version is 4.24.13 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- HTTP requests with 'wfu_ABSPATH' cookie containing suspicious values
- Unusual PHP file creation/modification in WordPress directories
- Web server error logs showing code execution attempts
Network Indicators:
- Outbound connections from WordPress server to unknown IPs post-exploitation
- Unusual spikes in traffic to the vulnerable endpoint
SIEM Query:
source="web_logs" AND (cookie="*wfu_ABSPATH*" OR uri="*/wfu_file_downloader.php*")