CVE-2021-36546
📋 TL;DR
KiteCMS 1.1 has an incorrect access control vulnerability that allows remote attackers to view sensitive files by manipulating URL paths. This affects all installations of KiteCMS 1.1 that are exposed to untrusted networks. Attackers can access configuration files, source code, or other sensitive data without authentication.
💻 Affected Systems
- KiteCMS
📦 What is this software?
Kitecms by Kitesky
⚠️ Risk & Real-World Impact
Worst Case
Attackers obtain database credentials, API keys, or administrative credentials leading to complete system compromise and data exfiltration.
Likely Case
Attackers access configuration files containing sensitive information like database credentials, enabling further attacks.
If Mitigated
With proper access controls and file permissions, attackers can only access non-sensitive files or receive access denied errors.
🎯 Exploit Status
Exploitation requires only web browser or curl commands. The GitHub issue shows proof-of-concept exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://github.com/Kitesky/KiteCMS/issues/10
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a newer version if available, or implement workarounds.
🔧 Temporary Workarounds
Web Server Access Restrictions
allConfigure web server to block directory traversal and restrict access to sensitive directories
# Apache: Add to .htaccess
<FilesMatch "\.(php|inc|conf|sql|log|txt)$">
Order Allow,Deny
Deny from all
</FilesMatch>
# Nginx: Add to server block
location ~ /\.(php|inc|conf|sql|log|txt)$ {
deny all;
}
Move Sensitive Files
linuxRelocate configuration files and sensitive data outside web root directory
mv /var/www/kitecms/config /etc/kitecms/
chmod 600 /etc/kitecms/*
🧯 If You Can't Patch
- Implement strict web application firewall rules to block path traversal patterns
- Monitor access logs for unusual file access patterns and implement alerting
🔍 How to Verify
Check if Vulnerable:
Attempt to access known sensitive files via URL manipulation, e.g., /config/database.php or /includes/config.inc.phpCheck Version:
Check KiteCMS version in admin panel or look for version markers in source filesVerify Fix Applied:
Test that sensitive files are no longer accessible via URL and return proper access denied errors📡 Detection & Monitoring
Log Indicators:
- HTTP 200 responses for .php, .inc, .conf, .sql, .log, .txt files outside normal content directories
- Multiple failed attempts to access sensitive file paths
Network Indicators:
- Unusual GET requests to non-standard file paths
- Patterns of directory traversal attempts
SIEM Query:
source="web_access.log" AND (uri="*.php" OR uri="*.inc" OR uri="*.conf" OR uri="*.sql" OR uri="*.log" OR uri="*.txt") AND response="200" AND NOT uri="*/index.php"