CVE-2023-29963
📋 TL;DR
S-CMS v5.0 contains an authenticated remote code execution vulnerability in the /admin/ajax.php component. Attackers with admin credentials can execute arbitrary code on the server. This affects all S-CMS v5.0 installations with default configurations.
💻 Affected Systems
- S-CMS
📦 What is this software?
S Cms by S Cms
⚠️ Risk & Real-World Impact
Worst Case
Full server compromise allowing data theft, ransomware deployment, and complete system control
Likely Case
Webshell installation leading to data exfiltration and lateral movement within the network
If Mitigated
Limited impact due to network segmentation and strict access controls
🎯 Exploit Status
Exploit requires admin credentials but is straightforward to execute
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a newer version if available or implementing workarounds.
🔧 Temporary Workarounds
Restrict admin access
allLimit admin panel access to specific IP addresses
# Add to .htaccess or web server config
Order deny,allow
Deny from all
Allow from 192.168.1.0/24
Disable vulnerable endpoint
allBlock access to /admin/ajax.php
# Apache
<Location /admin/ajax.php>
Order deny,allow
Deny from all
</Location>
# Nginx
location /admin/ajax.php {
deny all;
}
🧯 If You Can't Patch
- Implement strict network segmentation to isolate S-CMS from critical systems
- Enable detailed logging and monitoring for suspicious admin activity
🔍 How to Verify
Check if Vulnerable:
Check if S-CMS version is 5.0 and /admin/ajax.php is accessibleCheck Version:
Check S-CMS configuration files or admin panel footer for version informationVerify Fix Applied:
Verify /admin/ajax.php returns 403 Forbidden or is inaccessible📡 Detection & Monitoring
Log Indicators:
- POST requests to /admin/ajax.php with suspicious parameters
- Unusual admin login times or locations
- File creation/modification in web directories
Network Indicators:
- Outbound connections from web server to unknown IPs
- Unusual traffic patterns from admin interface
SIEM Query:
source="web_logs" AND (uri="/admin/ajax.php" AND method="POST" AND (param="*system*" OR param="*exec*" OR param="*shell*"))