CVE-2024-31011
📋 TL;DR
This vulnerability in BeeSCMS v4.0 allows remote attackers to write arbitrary files to the server by exploiting insufficient path isolation and lack of file extension validation in admin_template.php. Attackers can achieve remote code execution by writing malicious files. All systems running the vulnerable version are affected.
💻 Affected Systems
- BeeSCMS
📦 What is this software?
Beescms by Beescms
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through remote code execution, allowing attackers to install backdoors, steal data, or pivot to other systems.
Likely Case
Webshell deployment leading to persistent access, data exfiltration, and further exploitation of the server.
If Mitigated
Limited impact if file uploads are restricted and web application firewalls block malicious requests.
🎯 Exploit Status
The vulnerability is straightforward to exploit with publicly available information about the insecure file handling.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a newer version if available or implementing workarounds.
🔧 Temporary Workarounds
Restrict access to admin_template.php
allBlock or restrict access to the vulnerable admin_template.php file using web server configuration.
# Apache: Add to .htaccess
<Files "admin_template.php">
Order Deny,Allow
Deny from all
</Files>
# Nginx: Add to server block
location ~ /admin_template\.php$ {
deny all;
}
Implement file upload validation
allAdd server-side validation to restrict file types and sanitize file paths.
# Example PHP validation snippet
$allowed_extensions = array('jpg', 'png', 'gif');
$file_extension = strtolower(pathinfo($filename, PATHINFO_EXTENSION));
if (!in_array($file_extension, $allowed_extensions)) {
die('Invalid file type');
}
🧯 If You Can't Patch
- Implement a web application firewall (WAF) to block requests containing suspicious file paths or extensions.
- Monitor file system changes and restrict write permissions to web directories.
🔍 How to Verify
Check if Vulnerable:
Check if BeeSCMS version 4.0 is installed and if admin_template.php is accessible without authentication.Check Version:
Check the CMS version in the admin panel or look for version files in the installation directory.Verify Fix Applied:
Verify that admin_template.php is no longer accessible or that file upload validation has been implemented.📡 Detection & Monitoring
Log Indicators:
- Unusual file write operations in web server logs
- Requests to admin_template.php with file upload parameters
- Files with suspicious extensions appearing in web directories
Network Indicators:
- HTTP POST requests to admin_template.php with file content
- Unusual outbound connections from the web server
SIEM Query:
source="web_server.log" AND (uri="/admin_template.php" OR uri LIKE "%admin_template%") AND (method="POST" OR params LIKE "%file%")