CVE-2023-27224
📋 TL;DR
CVE-2023-27224 is a command injection vulnerability in Nginx Proxy Manager v2.9.19 that allows attackers to execute arbitrary code via malicious Lua scripts in configuration files. This affects all users running the vulnerable version of Nginx Proxy Manager. The vulnerability enables remote code execution with potentially full system compromise.
💻 Affected Systems
- Nginx Proxy Manager
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with attacker gaining root privileges, installing persistent backdoors, stealing sensitive data, and pivoting to other systems.
Likely Case
Attacker executes arbitrary commands to install cryptocurrency miners, create reverse shells, or deploy ransomware on the affected system.
If Mitigated
Attack limited to containerized environment with minimal privileges and no access to host system or sensitive data.
🎯 Exploit Status
Public proof-of-concept demonstrates command injection via Lua script injection. Exploitation requires network access to the Nginx Proxy Manager interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v2.9.20 and later
Vendor Advisory: https://github.com/NginxProxyManager/nginx-proxy-manager
Restart Required: Yes
Instructions:
1. Backup current configuration. 2. Update Nginx Proxy Manager to version 2.9.20 or later. 3. Restart the Nginx Proxy Manager service. 4. Verify the update was successful.
🔧 Temporary Workarounds
Disable Lua Script Support
allRemove or disable Lua script execution capabilities in Nginx configuration
Remove any Lua-related directives from nginx.conf and proxy host configurations
Network Segmentation
linuxRestrict access to Nginx Proxy Manager management interface
iptables -A INPUT -p tcp --dport 81 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 81 -j DROP
🧯 If You Can't Patch
- Isolate the vulnerable system in a separate network segment with strict firewall rules
- Implement application-level WAF with command injection detection rules
🔍 How to Verify
Check if Vulnerable:
Check Nginx Proxy Manager version via web interface at http://your-server:81 or run: docker ps | grep nginx-proxy-managerCheck Version:
docker exec nginx-proxy-manager cat /app/package.json | grep versionVerify Fix Applied:
Confirm version is 2.9.20 or later and test Lua script injection attempts are properly rejected📡 Detection & Monitoring
Log Indicators:
- Unusual Lua script execution in Nginx logs
- Suspicious command execution patterns in system logs
- Failed authentication attempts followed by configuration changes
Network Indicators:
- Unexpected outbound connections from Nginx Proxy Manager
- Command and control traffic patterns
- Unusual payloads in HTTP requests to management interface
SIEM Query:
source="nginx-proxy-manager" AND (lua OR script OR exec OR system OR os.execute)🔗 References
- https://github.com/LinuxProgramDevelop/NginxProxyManagerCommandInjectVulnInfo/blob/main/Nginx_proxy_manager_Command_Inject_vulnerability.pdf
- https://github.com/NginxProxyManager/nginx-proxy-manager
- https://github.com/LinuxProgramDevelop/NginxProxyManagerCommandInjectVulnInfo/blob/main/Nginx_proxy_manager_Command_Inject_vulnerability.pdf
- https://github.com/NginxProxyManager/nginx-proxy-manager
