CVE-2024-31012
📋 TL;DR
This vulnerability in SEMCMS v4.8 allows remote attackers to upload malicious files via upload.php, leading to arbitrary code execution, privilege escalation, and sensitive information disclosure. Any organization using SEMCMS v4.8 is affected. Attackers can compromise the entire system through this file upload flaw.
💻 Affected Systems
- SEMCMS
📦 What is this software?
Semcms by Sem Cms
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full administrative control, executing arbitrary commands, stealing all data, and using the server as a pivot point for further attacks.
Likely Case
Remote code execution leading to website defacement, data theft, and installation of backdoors or malware.
If Mitigated
Attack blocked at web application firewall level with proper file upload validation in place.
🎯 Exploit Status
The exploit appears to be simple file upload bypass with publicly available proof-of-concept code.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Check for official patch from SEMCMS vendor
2. If patch available, download and apply following vendor instructions
3. Test the fix thoroughly before deploying to production
🔧 Temporary Workarounds
Disable upload.php
linuxTemporarily disable or restrict access to the vulnerable upload.php file
mv upload.php upload.php.disabled
chmod 000 upload.php
Implement file upload restrictions
allAdd strict file type validation and size limits to upload functionality
🧯 If You Can't Patch
- Implement web application firewall with file upload protection rules
- Restrict network access to SEMCMS administration interface
🔍 How to Verify
Check if Vulnerable:
Check if SEMCMS version is 4.8 and upload.php file exists in the installation directoryCheck Version:
Check SEMCMS version in admin panel or configuration filesVerify Fix Applied:
Test file upload functionality with malicious files to ensure they are rejected📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to upload.php
- Multiple failed upload attempts
- Execution of unexpected PHP files
Network Indicators:
- HTTP POST requests to upload.php with unusual file extensions
- Outbound connections from web server to unknown IPs
SIEM Query:
source="web_logs" AND uri="/upload.php" AND (file_extension="php" OR file_extension="phtml" OR file_extension="phar")