CVE-2024-40518
📋 TL;DR
SeaCMS 12.9 contains a remote code execution vulnerability in admin_weixin.php where unvalidated user input is directly written to weixin.php. Authenticated attackers can exploit this to execute arbitrary system commands and gain full control of affected servers. This affects all SeaCMS 12.9 installations with the vulnerable component enabled.
💻 Affected Systems
- SeaCMS
📦 What is this software?
Seacms by Seacms
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary commands, install malware, exfiltrate data, pivot to other systems, and maintain persistent access.
Likely Case
Attackers gain shell access to the web server, allowing them to read/write files, access databases, and potentially compromise the entire server environment.
If Mitigated
With proper authentication controls and input validation, exploitation would be prevented or limited to authenticated users only.
🎯 Exploit Status
Exploitation requires authenticated access to the admin interface. The vulnerability is straightforward to exploit once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Check for official SeaCMS patches or updates. 2. If no patch exists, apply workarounds. 3. Monitor SeaCMS repositories for security updates.
🔧 Temporary Workarounds
Remove vulnerable file
allDelete or rename admin_weixin.php to prevent exploitation
mv admin_weixin.php admin_weixin.php.disabled
rm admin_weixin.php
Restrict file permissions
linuxMake weixin.php read-only to prevent code injection
chmod 444 weixin.php
🧯 If You Can't Patch
- Implement strict access controls to limit who can access the admin interface
- Deploy web application firewall with RCE protection rules
🔍 How to Verify
Check if Vulnerable:
Check if admin_weixin.php exists in SeaCMS installation and examine if it writes unvalidated user input to weixin.phpCheck Version:
Check SeaCMS version in configuration files or admin panelVerify Fix Applied:
Verify admin_weixin.php is removed/disabled or that weixin.php is properly validated before writing📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to admin_weixin.php
- File modification timestamps on weixin.php
- Suspicious command execution in web server logs
Network Indicators:
- HTTP requests containing shell commands or code injection patterns
- Unusual outbound connections from web server
SIEM Query:
source="web_server" AND (uri="*/admin_weixin.php" OR file_modification="weixin.php")