CVE-2024-46373
📋 TL;DR
Dedecms V5.7.115 contains a file upload vulnerability in the backend that allows authenticated attackers to upload malicious files and execute arbitrary code. This affects websites running this specific version of Dedecms content management system. Attackers can gain full control of the affected web server.
💻 Affected Systems
- Dedecms
📦 What is this software?
Dedecms by Dedecms
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise leading to data theft, ransomware deployment, lateral movement to other systems, and persistent backdoor installation.
Likely Case
Website defacement, data exfiltration, malware distribution, and unauthorized administrative access to the CMS.
If Mitigated
Limited impact with proper file upload restrictions, but still potential for privilege escalation if other vulnerabilities exist.
🎯 Exploit Status
Exploitation requires backend/admin credentials. Public proof-of-concept code is available in the GitHub reference.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to latest Dedecms version (check vendor site)
Vendor Advisory: Not specified in provided reference
Restart Required: No
Instructions:
1. Backup your website and database. 2. Download the latest Dedecms version from official source. 3. Replace vulnerable files with patched versions. 4. Verify file permissions and remove any suspicious uploaded files.
🔧 Temporary Workarounds
Restrict File Upload Types
allConfigure web server to block upload of executable file types
# For Apache: Add to .htaccess
<FilesMatch "\.(php|phtml|php3|php4|php5|php7|phps|php8|inc|exe|bat|cmd|sh|pl|cgi)">
Order Allow,Deny
Deny from all
</FilesMatch>
# For Nginx: Add to server block
location ~* \.(php|phtml|php3|php4|php5|php7|phps|php8|inc|exe|bat|cmd|sh|pl|cgi)$ {
deny all;
}
Disable Backend Upload Function
linuxTemporarily disable the vulnerable upload functionality
# Rename or remove the vulnerable upload handler file
mv /path/to/dedecms/upload/handler.php /path/to/dedecms/upload/handler.php.disabled
🧯 If You Can't Patch
- Implement strict file upload validation: only allow specific file types, check file signatures, and rename uploaded files
- Restrict backend access: Implement IP whitelisting, strong authentication, and monitor admin panel access logs
🔍 How to Verify
Check if Vulnerable:
Check if running Dedecms V5.7.115 by examining version files or admin panel footerCheck Version:
grep -r "V5.7.115" /path/to/dedecms/ or check /data/common.inc.php for version infoVerify Fix Applied:
Test file upload functionality with malicious files to ensure they are rejected📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to backend/admin paths
- Multiple failed login attempts to admin panel
- Execution of PHP files from upload directories
Network Indicators:
- POST requests to upload endpoints with suspicious file extensions
- Outbound connections from web server to unknown IPs
SIEM Query:
source="web_logs" AND (uri_path="/dede/upload*" OR uri_path="/admin/upload*") AND (file_extension="php" OR file_extension="exe" OR file_extension="sh")