CVE-2024-0643
📋 TL;DR
CVE-2024-0643 is a critical unrestricted file upload vulnerability in C21 Live Encoder and Live Mosaic version 5.3 that allows remote attackers to upload dangerous file types without restrictions. This can lead to complete system compromise through remote code execution. Organizations using these specific Cires21 products are affected.
💻 Affected Systems
- C21 Live Encoder
- C21 Live Mosaic
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with complete administrative control, data theft, ransomware deployment, and lateral movement across the network.
Likely Case
Remote code execution leading to web shell installation, data exfiltration, and system takeover.
If Mitigated
Attack blocked at perimeter with no successful exploitation due to proper file upload validation and network segmentation.
🎯 Exploit Status
Unrestricted file upload vulnerabilities are trivial to exploit with basic web penetration testing tools.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in references - check vendor advisory
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-cires21-products
Restart Required: Yes
Instructions:
1. Contact Cires21 for patch information 2. Apply vendor-provided update 3. Restart affected services 4. Verify fix implementation
🔧 Temporary Workarounds
Web Application Firewall Rules
allImplement WAF rules to block file uploads with dangerous extensions
WAF-specific configuration required
Network Segmentation
allIsolate affected systems from internet and restrict internal access
Firewall rules to block external access to affected ports
🧯 If You Can't Patch
- Immediately isolate affected systems from internet and restrict to necessary internal access only
- Implement strict file upload validation at reverse proxy or application layer
🔍 How to Verify
Check if Vulnerable:
Check product version in web interface or configuration files. If version is 5.3, assume vulnerable.Check Version:
Check web interface or product documentation for version informationVerify Fix Applied:
Test file upload functionality with dangerous extensions (e.g., .php, .jsp, .exe) - should be rejected.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads
- Files with dangerous extensions in upload directories
- Web shell access patterns
Network Indicators:
- POST requests to upload endpoints with dangerous file types
- Unusual outbound connections from affected systems
SIEM Query:
source="web_server" AND (uri="*upload*" OR uri="*file*" OR method="POST") AND (extension=".php" OR extension=".jsp" OR extension=".exe" OR extension=".asp")