CVE-2023-30264
📋 TL;DR
CLTPHP versions up to 6.0 are vulnerable to unrestricted file upload via the Template.php:update function, allowing attackers to upload malicious files like webshells. This affects all users running vulnerable versions, potentially leading to remote code execution.
💻 Affected Systems
- CLTPHP
📦 What is this software?
Cltphp by Cltphp
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise via remote code execution, data theft, or ransomware deployment.
Likely Case
Unauthorized file upload leading to webshell installation and server control.
If Mitigated
Limited impact if file uploads are restricted or monitored, but risk persists.
🎯 Exploit Status
Exploit details are publicly available, making it easy for attackers to weaponize.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
Upgrade to a version above 6.0 if available; otherwise, apply workarounds or consider alternative software.
🔧 Temporary Workarounds
Restrict file upload types
allModify the Template.php to validate file extensions and MIME types before upload.
Edit application/admin/controller/Template.php to add validation checks.
Disable vulnerable endpoint
allTemporarily disable or restrict access to the update function in Template.php.
Comment out or remove the update method in Template.php.
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block malicious file uploads.
- Monitor file upload logs for suspicious activity and restrict server permissions.
🔍 How to Verify
Check if Vulnerable:
Check if CLTPHP version is <= 6.0 and review Template.php for lack of file validation.Check Version:
Check version in CLTPHP configuration files or admin panel.Verify Fix Applied:
Test file upload with malicious extensions; if blocked, fix is applied.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to Template.php endpoint, especially with .php or .exe extensions.
Network Indicators:
- HTTP POST requests to /application/admin/controller/Template.php with file uploads.
SIEM Query:
source="web_logs" AND uri="/application/admin/controller/Template.php" AND method="POST" AND file_upload="true"