CVE-2021-32538
📋 TL;DR
CVE-2021-32538 is an unauthenticated remote code execution vulnerability in ARTWARE CMS. Attackers can upload arbitrary files without authentication through the image upload function, leading to complete system compromise. All ARTWARE CMS installations are affected.
💻 Affected Systems
- ARTWARE CMS
📦 What is this software?
Artware Cms by Artware Cms Project
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with attacker gaining full administrative control, data exfiltration, ransomware deployment, and persistent backdoor installation.
Likely Case
Website defacement, data theft, cryptocurrency mining, or use as part of a botnet for further attacks.
If Mitigated
Attack blocked at perimeter with file upload restrictions, resulting in failed exploitation attempts.
🎯 Exploit Status
Simple file upload bypass with readily available exploit scripts.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor for specific patched version
Vendor Advisory: https://www.twcert.org.tw/tw/cp-132-4850-9b53f-1.html
Restart Required: No
Instructions:
1. Download latest ARTWARE CMS version from official source. 2. Backup current installation. 3. Replace vulnerable files with patched versions. 4. Verify upload functionality works with proper file type validation.
🔧 Temporary Workarounds
File Upload Restriction
linuxImplement server-side file type validation and restrict upload directory permissions
chmod 755 upload_directory/
chown www-data:www-data upload_directory/
Web Application Firewall Rules
allBlock suspicious file uploads at WAF level
🧯 If You Can't Patch
- Disable file upload functionality completely in ARTWARE CMS
- Implement network segmentation and isolate ARTWARE CMS server from critical systems
🔍 How to Verify
Check if Vulnerable:
Attempt to upload a PHP file through the image upload function. If successful, system is vulnerable.Check Version:
Check ARTWARE CMS version in admin panel or configuration filesVerify Fix Applied:
Attempt same upload test - should be rejected with proper file type validation error.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to image directory
- Execution of unexpected file types in upload directory
- Failed authentication attempts followed by upload requests
Network Indicators:
- POST requests to upload endpoints with non-image file types
- Subsequent requests to uploaded malicious files
SIEM Query:
source="web_logs" AND (uri="*upload*" OR uri="*image*upload*") AND (file_extension="php" OR file_extension="jsp" OR file_extension="asp")