CVE-2020-16204
📋 TL;DR
CVE-2020-16204 is a critical vulnerability in Red Lion N-Tron 702-W/702M12-W industrial switches that allows remote attackers to execute arbitrary commands with root privileges via an undocumented interface. This affects all versions of these industrial network switches, potentially compromising entire industrial control systems.
💻 Affected Systems
- Red Lion N-Tron 702-W
- Red Lion N-Tron 702M12-W
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of industrial network switches allowing attackers to execute arbitrary commands as root, potentially disrupting industrial operations, modifying network configurations, or using the device as a pivot point into critical infrastructure networks.
Likely Case
Remote code execution leading to device compromise, network disruption, and potential lateral movement into industrial control systems.
If Mitigated
Limited impact if devices are properly segmented, have restricted network access, and are monitored for unusual activity.
🎯 Exploit Status
Public exploit code and detailed technical analysis available. Exploitation requires network access to the device but no authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Contact vendor for latest firmware
Vendor Advisory: https://us-cert.cisa.gov/ics/advisories/icsa-20-240-01
Restart Required: Yes
Instructions:
1. Contact Red Lion for latest firmware updates
2. Backup current configuration
3. Apply firmware update following vendor instructions
4. Verify update successful and reconfigure as needed
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected devices in separate VLANs with strict firewall rules
Access Control Lists
allImplement strict network ACLs to limit access to device management interfaces
🧯 If You Can't Patch
- Segment devices in isolated network zones with strict firewall rules
- Implement network monitoring and intrusion detection for unusual traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check device model and firmware version via web interface or CLI. All N-Tron 702-W/702M12-W devices are vulnerable regardless of version.Check Version:
Check via web interface or use SNMP queries to verify device model and firmware versionVerify Fix Applied:
Verify firmware version has been updated to vendor-provided patched version and test that undocumented interface is no longer accessible.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to device management interfaces
- Unexpected configuration changes
- Unusual command execution patterns
Network Indicators:
- Traffic to undocumented device interfaces
- Unexpected outbound connections from industrial switches
- Anomalous network traffic patterns
SIEM Query:
source_ip IN (industrial_switch_ips) AND (http_user_agent CONTAINS 'exploit' OR uri_path CONTAINS 'undocumented' OR status_code=200 AND bytes_sent>threshold)🔗 References
- http://packetstormsecurity.com/files/159064/Red-Lion-N-Tron-702-W-702M12-W-2.0.26-XSS-CSRF-Shell.html
- http://seclists.org/fulldisclosure/2020/Sep/6
- https://us-cert.cisa.gov/ics/advisories/icsa-20-240-01
- http://packetstormsecurity.com/files/159064/Red-Lion-N-Tron-702-W-702M12-W-2.0.26-XSS-CSRF-Shell.html
- http://seclists.org/fulldisclosure/2020/Sep/6
- https://us-cert.cisa.gov/ics/advisories/icsa-20-240-01
