CVE-2014-3927
📋 TL;DR
CVE-2014-3927 is a critical remote code execution vulnerability in mrlg4php's mrlg-lib.php file that allows attackers to execute arbitrary shell commands on affected systems. This affects all users running mrlg4php versions before 1.0.8. The vulnerability stems from improper input validation that enables code injection.
💻 Affected Systems
- mrlg4php
📦 What is this software?
Mrlg4php by Mrlg4php Project
⚠️ 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
Remote code execution leading to web server compromise, data theft, defacement, or use as part of a botnet.
If Mitigated
Limited impact with proper network segmentation, web application firewalls, and least privilege configurations preventing lateral movement.
🎯 Exploit Status
Exploitation is straightforward with publicly available proof-of-concept code. The vulnerability allows direct code execution without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.0.8
Vendor Advisory: https://github.com/infrastation/mrlg4php/issues/1
Restart Required: No
Instructions:
1. Download mrlg4php version 1.0.8 or later from the official repository. 2. Replace the existing mrlg-lib.php file with the patched version. 3. Verify the file permissions are correct. 4. Test functionality to ensure compatibility.
🔧 Temporary Workarounds
Remove vulnerable file
linuxTemporarily remove or rename the mrlg-lib.php file if not essential for functionality
mv /path/to/mrlg-lib.php /path/to/mrlg-lib.php.bak
Restrict file permissions
linuxSet strict file permissions to limit execution capabilities
chmod 644 /path/to/mrlg-lib.php
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block suspicious input patterns and shell command attempts
- Isolate affected systems in a segmented network zone with strict outbound traffic controls
🔍 How to Verify
Check if Vulnerable:
Check the version of mrlg4php installed. If version is earlier than 1.0.8, the system is vulnerable. Also check if mrlg-lib.php file exists in the installation.Check Version:
grep -r 'version' /path/to/mrlg4php/installation/ | grep -i mrlgVerify Fix Applied:
Verify the mrlg4php version is 1.0.8 or later. Check the modification date of mrlg-lib.php file to confirm it has been updated.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to mrlg-lib.php
- Shell command execution in web server logs
- Unexpected process spawns from web server user
Network Indicators:
- Outbound connections from web server to suspicious IPs
- Unusual traffic patterns from web server
SIEM Query:
source="web_server_logs" AND (uri="*mrlg-lib.php*" OR message="*shell*" OR message="*exec*" OR message="*system*")