CVE-2023-46958
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on systems running lmxcms v1.41 by sending crafted scripts to the admin.php file. This is a critical remote code execution vulnerability affecting all deployments of lmxcms version 1.41. Attackers can gain complete control of affected systems.
💻 Affected Systems
- lmxcms
📦 What is this software?
Lmxcms by Lmxcms
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary commands, install malware, steal data, pivot to other systems, and maintain persistent access.
Likely Case
Attackers gain web server privileges, deface websites, install cryptocurrency miners or ransomware, and exfiltrate sensitive data.
If Mitigated
With proper network segmentation and least privilege, impact limited to web server compartment with no lateral movement.
🎯 Exploit Status
Proof of concept available in public GitHub gist. Exploitation requires minimal technical skill.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: http://lmxcms.com
Restart Required: No
Instructions:
No official patch available. Consider migrating to alternative CMS or implementing workarounds.
🔧 Temporary Workarounds
Block admin.php access
allRestrict access to vulnerable admin.php file using web server configuration
# Apache: RewriteEngine On
RewriteRule ^admin\.php$ - [F,L]
# Nginx: location ~ /admin\.php$ { deny all; }
Web Application Firewall rules
allImplement WAF rules to block malicious requests to admin.php
# ModSecurity rule: SecRule REQUEST_URI "@contains admin.php" "id:1001,phase:1,deny"
🧯 If You Can't Patch
- Isolate affected systems in separate network segment with strict egress filtering
- Implement application allowlisting and monitor for unauthorized process execution
🔍 How to Verify
Check if Vulnerable:
Check if lmxcms version is 1.41 by examining version files or CMS admin panelCheck Version:
grep -r 'version.*1.41' /path/to/lmxcms/ or check admin panelVerify Fix Applied:
Test if admin.php file is accessible and responds to crafted requests📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to admin.php with script content
- Web server error logs showing code execution attempts
- Unexpected process execution from web server user
Network Indicators:
- HTTP requests to admin.php with encoded payloads
- Outbound connections from web server to suspicious IPs
SIEM Query:
source="web_logs" AND uri="*admin.php*" AND (method="POST" OR method="PUT") AND size>1000