CVE-2022-31206
📋 TL;DR
CVE-2022-31206 allows attackers to upload and execute arbitrary machine code on Omron SYSMAC PLCs due to lack of cryptographic authentication for downloaded logic. This affects all Omron SYSMAC Nx product family PLCs (NJ, NY, NX, PMAC series) through 2022-05-18. Industrial control system operators using these PLCs are at risk of unauthorized code execution.
💻 Affected Systems
- Omron SYSMAC NJ series
- Omron SYSMAC NY series
- Omron SYSMAC NX series
- Omron SYSMAC PMAC series
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of PLC allowing arbitrary code execution, potential physical process manipulation, safety system bypass, and lateral movement to other industrial systems.
Likely Case
Unauthorized logic modification leading to process disruption, data manipulation, or denial of service in industrial operations.
If Mitigated
Limited impact if network segmentation and access controls prevent unauthorized connections to PLC programming ports.
🎯 Exploit Status
Exploitation requires network access to PLC programming ports but no authentication. Attack tools for industrial protocols are increasingly available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://www.cisa.gov/uscert/ics/advisories/icsa-22-179-02
Restart Required: No
Instructions:
No official patch exists. Follow CISA ICS advisory recommendations for mitigation and workarounds.
🔧 Temporary Workarounds
Network Segmentation
allIsolate PLCs in dedicated industrial network segments with strict firewall rules
Access Control Lists
allImplement strict IP-based access controls allowing only authorized engineering stations to connect to PLC programming ports
🧯 If You Can't Patch
- Implement network monitoring for unauthorized connections to PLC programming ports (typically TCP 9600)
- Use application allowlisting on engineering workstations to prevent unauthorized SYSMAC Studio usage
🔍 How to Verify
Check if Vulnerable:
Check if you have Omron SYSMAC NJ/NY/NX/PMAC series PLCs manufactured before May 2022Check Version:
Check PLC firmware version via SYSMAC Studio softwareVerify Fix Applied:
Verify network segmentation prevents unauthorized access to PLC programming interfaces📡 Detection & Monitoring
Log Indicators:
- Unauthorized connection attempts to TCP port 9600
- Multiple failed programming sessions
- Unexpected logic download events
Network Indicators:
- Unusual traffic patterns to PLC programming ports
- Connections from unauthorized IP addresses to industrial network segments
SIEM Query:
source_ip NOT IN (authorized_engineering_stations) AND dest_port=9600 AND protocol=TCP