CVE-2016-8363
📋 TL;DR
This critical vulnerability allows authenticated users to execute arbitrary operating system commands on affected Moxa industrial networking devices. Attackers can gain complete control of the device, potentially compromising industrial control systems. The vulnerability affects multiple Moxa OnCell, AWK, WAC, and TAP series products used in industrial environments.
💻 Affected Systems
- Moxa OnCell OnCellG3470A-LTE
- AWK-1131A/3131A/4131A Series
- AWK-3191 Series
- AWK-5232/6232 Series
- AWK-1121/1127 Series
- WAC-1001 V2 Series
- WAC-2004 Series
- AWK-3121-M12-RTG Series
- AWK-3131-M12-RCC Series
- AWK-5232-M12-RCC Series
- TAP-6226 Series
- AWK-3121/4121 Series
- AWK-3131/4131 Series
- AWK-5222/6222 Series
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of industrial control systems leading to physical damage, production shutdown, safety system manipulation, or data exfiltration from critical infrastructure.
Likely Case
Unauthorized access to industrial networks, device takeover for lateral movement, disruption of industrial operations, and potential data theft.
If Mitigated
Limited impact if devices are properly segmented, monitored, and have restricted user access, though risk remains due to authenticated exploitation.
🎯 Exploit Status
Exploitation requires authenticated access but is straightforward once credentials are obtained. Industrial control system attackers often target such devices.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware updates released by Moxa - specific versions vary by product
Vendor Advisory: https://ics-cert.us-cert.gov/advisories/ICSA-16-308-01
Restart Required: Yes
Instructions:
1. Identify affected Moxa device models. 2. Visit Moxa support website for specific firmware updates. 3. Download appropriate firmware version. 4. Follow Moxa's firmware upgrade procedure. 5. Verify successful update and restart device.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected devices in separate network segments with strict firewall rules
Access Control Hardening
allImplement strong authentication, change default credentials, and restrict administrative access
🧯 If You Can't Patch
- Implement strict network segmentation to isolate devices from critical systems
- Enable detailed logging and monitoring for suspicious command execution attempts
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against Moxa's patched versions list in ICSA-16-308-01 advisoryCheck Version:
Check via web interface or CLI: varies by device model - typically accessible via device management interfaceVerify Fix Applied:
Verify firmware version has been updated to patched version and test command injection attempts fail📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed authentication attempts followed by successful login
- Unexpected system process creation
Network Indicators:
- Unusual outbound connections from industrial devices
- Traffic to unexpected ports from affected devices
- Anomalous protocol usage
SIEM Query:
Example: 'source="moxa-device" AND (event="command_execution" OR event="system_process")'