CVE-2020-17384
📋 TL;DR
This vulnerability allows attackers with administrator cookies to inject malicious commands through improperly validated URLs in Cellopoint CelloOS. It enables remote code execution on affected systems. Organizations using Cellopoint CelloOS v4.1.10 Build 20190922 are at risk.
💻 Affected Systems
- Cellopoint CelloOS
📦 What is this software?
Cellos by Cellopoint
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing attackers to execute arbitrary commands, steal sensitive data, install malware, or pivot to other network systems.
Likely Case
Attackers with stolen admin credentials can execute commands to exfiltrate data, modify system configurations, or disrupt operations.
If Mitigated
With proper network segmentation and access controls, impact limited to isolated system compromise without lateral movement.
🎯 Exploit Status
Exploitation requires admin cookie but command injection is straightforward once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Later versions after v4.1.10 Build 20190922
Vendor Advisory: https://www.twcert.org.tw/tw/cp-132-3845-be6bf-1.html
Restart Required: Yes
Instructions:
1. Contact Cellopoint for updated version. 2. Backup configuration. 3. Apply patch/upgrade. 4. Restart system. 5. Verify fix.
🔧 Temporary Workarounds
Input Validation Filter
allImplement URL input validation to block command injection characters
# Requires custom web application firewall or input filtering rules
Cookie Security Hardening
allImplement secure cookie attributes and rotation to prevent cookie theft
# Set HttpOnly, Secure, SameSite attributes for admin cookies
🧯 If You Can't Patch
- Network segmentation to isolate CelloOS system from critical assets
- Implement strict access controls and monitor for unusual admin cookie usage
🔍 How to Verify
Check if Vulnerable:
Check system version via admin interface or contact Cellopoint supportCheck Version:
# Check via admin web interface or system information pageVerify Fix Applied:
Test URL input validation after patch and verify version is updated📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed authentication attempts followed by successful admin login
- URL parameters containing shell metacharacters
Network Indicators:
- Unusual outbound connections from CelloOS system
- Traffic to unexpected ports or IPs
SIEM Query:
source="celloos" AND (url="*;*" OR url="*|*" OR url="*`*" OR url="*$(*")