CVE-2024-22895
📋 TL;DR
DedeCMS 5.7.112 contains an unrestricted file upload vulnerability in the module_upload.php component. Attackers can upload malicious files to execute arbitrary code on affected systems. This affects all DedeCMS installations running the vulnerable version.
💻 Affected Systems
- DedeCMS
📦 What is this software?
Dedecms by Dedecms
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise via remote code execution, leading to data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Webshell upload leading to website defacement, data exfiltration, or use as a pivot point for internal network attacks.
If Mitigated
Limited impact if file uploads are restricted to authenticated users only and proper file type validation is implemented.
🎯 Exploit Status
Simple file upload exploitation with publicly available proof-of-concept code.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
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 access to uploads/dede/ directory
allBlock web access to the vulnerable uploads/dede/ directory using web server configuration.
# Apache: Add to .htaccess
<Files "module_upload.php">
Order Allow,Deny
Deny from all
</Files>
# Nginx: Add to server block
location ~ /uploads/dede/module_upload\.php$ {
deny all;
}
Implement file upload validation
allAdd server-side file type validation and restrict uploads to specific extensions.
# Example PHP validation snippet
$allowed_extensions = ['jpg', 'png', 'gif'];
$file_extension = strtolower(pathinfo($_FILES['file']['name'], PATHINFO_EXTENSION));
if (!in_array($file_extension, $allowed_extensions)) {
die('Invalid file type');
}
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block file uploads to the vulnerable endpoint
- Disable the uploads/dede/module_upload.php file by renaming or removing it
🔍 How to Verify
Check if Vulnerable:
Check if /uploads/dede/module_upload.php exists and is accessible via web browser or curl.Check Version:
Check DedeCMS version in /data/common.inc.php or admin interfaceVerify Fix Applied:
Attempt to access /uploads/dede/module_upload.php and verify it returns 403 Forbidden or is inaccessible.📡 Detection & Monitoring
Log Indicators:
- POST requests to /uploads/dede/module_upload.php
- File uploads with suspicious extensions (.php, .jsp, .asp)
Network Indicators:
- Unusual outbound connections from web server
- Large file uploads to the vulnerable endpoint
SIEM Query:
source="web_logs" AND uri="/uploads/dede/module_upload.php" AND method="POST"