CVE-2024-7329
📋 TL;DR
This critical vulnerability in YouDianCMS 7 allows remote attackers to upload arbitrary files without restrictions via the /Public/ckeditor/plugins/multiimage/dialogs/image_upload.php file. Attackers can exploit this to upload malicious files like web shells, potentially gaining full control of affected systems. All YouDianCMS 7 installations using the vulnerable CKEditor plugin are affected.
💻 Affected Systems
- YouDianCMS
📦 What is this software?
Youdiancms by Youdiancms
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise via web shell upload leading to data theft, ransomware deployment, or use as attack infrastructure
Likely Case
Web shell upload enabling persistent backdoor access, data exfiltration, and lateral movement within the network
If Mitigated
File upload attempts blocked or quarantined with no successful exploitation
🎯 Exploit Status
Exploit details are publicly available; simple HTTP POST requests can trigger the vulnerability
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None - vendor did not respond to disclosure
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a newer version if available, or apply workarounds.
🔧 Temporary Workarounds
Delete vulnerable file
linuxRemove or rename the vulnerable PHP file to prevent exploitation
mv /path/to/Public/ckeditor/plugins/multiimage/dialogs/image_upload.php /path/to/Public/ckeditor/plugins/multiimage/dialogs/image_upload.php.bak
Web server file restriction
allBlock access to the vulnerable file via web server configuration
# Apache: <Location "/Public/ckeditor/plugins/multiimage/dialogs/image_upload.php">
Deny from all
</Location>
# Nginx: location ~ /Public/ckeditor/plugins/multiimage/dialogs/image_upload\.php$ { deny all; }
🧯 If You Can't Patch
- Implement strict file upload validation at the web application firewall level
- Monitor file upload directories for suspicious files and implement file integrity monitoring
🔍 How to Verify
Check if Vulnerable:
Check if /Public/ckeditor/plugins/multiimage/dialogs/image_upload.php exists and is accessible via HTTPCheck Version:
Check YouDianCMS version in admin panel or configuration filesVerify Fix Applied:
Attempt to access the vulnerable endpoint and verify it returns 403/404 or test file upload functionality📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /Public/ckeditor/plugins/multiimage/dialogs/image_upload.php
- File creation in upload directories with suspicious extensions (.php, .jsp, .asp)
Network Indicators:
- Unusual outbound connections from web server after file upload attempts
- Traffic patterns indicating web shell communication
SIEM Query:
source="web_logs" AND (uri="/Public/ckeditor/plugins/multiimage/dialogs/image_upload.php" OR file_extension IN ("php", "jsp", "asp"))