CVE-2020-14067
📋 TL;DR
This vulnerability allows remote attackers to upload and execute arbitrary PHP code on Navigate CMS servers by exploiting insufficient file extension validation in ZIP archive processing. It affects all Navigate CMS 2.9 installations with extension/theme upload functionality enabled. Attackers can achieve remote code execution (RCE) by uploading malicious .phtml files disguised within ZIP archives.
💻 Affected Systems
- Navigate CMS
📦 What is this software?
Navigatecms by Naviwebs
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise via remote code execution, allowing attackers to execute arbitrary commands, steal data, install backdoors, or pivot to other systems.
Likely Case
Webshell deployment leading to data theft, defacement, or use as part of a botnet.
If Mitigated
Limited impact if file uploads are disabled or proper file validation is implemented.
🎯 Exploit Status
Exploitation requires administrative access to upload extensions/themes. The vulnerability is well-documented with public proof-of-concept available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Navigate CMS after commit f1f47126b359d73a2635306ae46d8719c14d240b
Vendor Advisory: https://github.com/NavigateCMS/Navigate-CMS/commit/f1f47126b359d73a2635306ae46d8719c14d240b
Restart Required: No
Instructions:
1. Update to the latest Navigate CMS version. 2. Apply the patch from GitHub commit f1f47126b359d73a2635306ae46d8719c14d240b. 3. Verify .phtml files are now properly validated during ZIP extraction.
🔧 Temporary Workarounds
Disable extension/theme uploads
allTemporarily disable the ability to upload extensions and themes via the admin interface.
Navigate to Admin Panel > Settings > Extensions/Themes and disable upload functionality
Block .phtml file execution
linuxConfigure web server to block execution of .phtml files.
Add to .htaccess: <FilesMatch "\.phtml$">
Order Allow,Deny
Deny from all
</FilesMatch>
🧯 If You Can't Patch
- Implement strict file upload validation that rejects ZIP archives containing .phtml files
- Deploy web application firewall (WAF) rules to block malicious file uploads
🔍 How to Verify
Check if Vulnerable:
Check if running Navigate CMS 2.9 and test if .phtml files in ZIP archives bypass validation during extension/theme upload.Check Version:
Check Navigate CMS version in admin panel or examine version files in installation directory.Verify Fix Applied:
Verify the patch is applied by checking if .phtml files are now properly rejected during ZIP extraction.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to extension/theme endpoints
- Execution of .phtml files in web directories
- Admin panel login attempts followed by file uploads
Network Indicators:
- POST requests to /admin/*/upload endpoints with ZIP files
- Unexpected outbound connections from web server
SIEM Query:
source="web_server" AND (uri_path="/admin/extensions/upload" OR uri_path="/admin/themes/upload") AND file_extension="zip"