CVE-2024-40522
📋 TL;DR
SeaCMS 12.9 contains a remote code execution vulnerability in phomebak.php where unfiltered variable names are written into PHP files. Authenticated attackers can exploit this to execute arbitrary commands and gain system permissions. This affects all SeaCMS 12.9 installations with the vulnerable file present.
💻 Affected Systems
- SeaCMS
📦 What is this software?
Seacms by Seacms
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing attacker to execute arbitrary commands, install malware, exfiltrate data, and maintain persistent access.
Likely Case
Web server compromise leading to data theft, defacement, or use as attack platform.
If Mitigated
Limited impact with proper authentication controls and file system restrictions.
🎯 Exploit Status
Exploitation requires authenticated access but is straightforward once credentials are obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Check for official SeaCMS patch or update
2. If no patch, apply workarounds
3. Monitor SeaCMS security announcements
🔧 Temporary Workarounds
Remove vulnerable file
linuxDelete or rename phomebak.php to prevent exploitation
rm /path/to/seacms/phomebak.php
mv /path/to/seacms/phomebak.php /path/to/seacms/phomebak.php.bak
Restrict file permissions
linuxSet phomebak.php to read-only for web server user
chmod 444 /path/to/seacms/phomebak.php
🧯 If You Can't Patch
- Implement strict authentication controls and monitor for suspicious login attempts
- Restrict network access to SeaCMS administration interface using firewall rules
🔍 How to Verify
Check if Vulnerable:
Check if phomebak.php exists in SeaCMS installation directory and review version number in configuration filesCheck Version:
grep -r 'version' /path/to/seacms/config/ || cat /path/to/seacms/readme.txtVerify Fix Applied:
Verify phomebak.php has been removed, renamed, or made read-only, and check for updated SeaCMS version📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to phomebak.php
- Multiple failed login attempts followed by successful login
- File modification events in SeaCMS directory
Network Indicators:
- HTTP requests containing PHP code in parameters to phomebak.php
- Outbound connections from web server to suspicious IPs
SIEM Query:
source="web_logs" AND uri="*phomebak.php*" AND (method="POST" OR params="*php*" OR params="*system(*" OR params="*exec(*")