CVE-2021-46093
📋 TL;DR
eliteCMS v1.0 has an insecure permissions vulnerability in manage_uploads.php that allows attackers to bypass authentication and access administrative file upload functions. This affects all installations of eliteCMS v1.0 using default configurations. Attackers can upload malicious files or manipulate existing uploads.
💻 Affected Systems
- eliteCMS
📦 What is this software?
Elite Cms by Elitecms
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise via remote code execution through malicious file uploads, leading to data theft, defacement, or ransomware deployment.
Likely Case
Unauthorized file uploads leading to website defacement, malware distribution, or data exfiltration through uploaded web shells.
If Mitigated
Limited impact with proper file validation, restricted upload directories, and web application firewalls blocking malicious upload attempts.
🎯 Exploit Status
The vulnerability is simple to exploit with publicly available proof-of-concept code. Attackers can directly access the vulnerable endpoint without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch exists. Consider migrating to a supported CMS or implementing the workarounds below.
🔧 Temporary Workarounds
Restrict access to manage_uploads.php
allAdd authentication and authorization checks to the manage_uploads.php file or restrict access via web server configuration.
# Apache: Add to .htaccess
<Files "manage_uploads.php">
Require valid-user
AuthType Basic
AuthName "Restricted Access"
AuthUserFile /path/to/.htpasswd
</Files>
# Nginx: Add to server block
location ~ /manage_uploads\.php$ {
auth_basic "Restricted Access";
auth_basic_user_file /path/to/.htpasswd;
}
Disable or rename vulnerable file
linuxTemporarily disable the vulnerable upload management functionality by renaming or removing the file.
mv manage_uploads.php manage_uploads.php.disabled
chmod 000 manage_uploads.php.disabled
🧯 If You Can't Patch
- Implement strict file upload validation including file type checking, size limits, and content scanning.
- Deploy a web application firewall (WAF) with rules to block unauthorized access to manage_uploads.php and malicious file upload patterns.
🔍 How to Verify
Check if Vulnerable:
Attempt to access /manage_uploads.php without authentication. If accessible, the system is vulnerable.Check Version:
Check CMS version in admin panel or look for version indicators in source code/composer.json.Verify Fix Applied:
Verify that accessing /manage_uploads.php without proper authentication returns an error (403/401) or is blocked.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to manage_uploads.php
- Unusual file uploads from unexpected IP addresses
- POST requests to upload endpoints without proper authentication headers
Network Indicators:
- HTTP requests to /manage_uploads.php without authentication
- Unusual file upload traffic patterns
SIEM Query:
source="web_logs" AND (url="/manage_uploads.php" OR url="*manage_uploads*") AND (status="200" OR status="302") AND NOT (user_agent="*bot*" OR user_agent="*crawler*")