CVE-2020-27257
📋 TL;DR
This vulnerability allows local attackers to execute arbitrary code on Omron CX-One industrial automation software due to improper validation of user-supplied data, leading to type confusion. It affects Omron CX-One Version 4.60 and prior installations. Attackers must have local access to the system to exploit this vulnerability.
💻 Affected Systems
- Omron CX-One
📦 What is this software?
Cx One by Omron
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary code with the privileges of the vulnerable process, potentially leading to full control of the industrial automation system, disruption of operations, or lateral movement within the network.
Likely Case
Local privilege escalation or arbitrary code execution within the context of the vulnerable application, potentially allowing attackers to modify control logic, steal sensitive industrial data, or disrupt automation processes.
If Mitigated
Limited impact due to proper access controls, network segmentation, and least privilege principles preventing local attackers from reaching vulnerable systems.
🎯 Exploit Status
Exploitation requires local access and understanding of the type confusion condition. No public exploit code has been released as of available advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 4.61 or later
Vendor Advisory: https://www.omron.com/global/en/
Restart Required: Yes
Instructions:
1. Download CX-One Version 4.61 or later from Omron's official website. 2. Back up current configuration and projects. 3. Uninstall previous version. 4. Install the updated version. 5. Restart the system. 6. Verify installation and restore configurations.
🔧 Temporary Workarounds
Restrict Local Access
allLimit local access to CX-One systems to authorized personnel only through physical security and user account controls.
Network Segmentation
allIsolate CX-One systems on separate network segments with strict firewall rules to prevent lateral movement.
🧯 If You Can't Patch
- Implement strict access controls to limit local user access to CX-One systems
- Monitor for suspicious activity and implement application whitelisting to prevent unauthorized code execution
🔍 How to Verify
Check if Vulnerable:
Check CX-One version in the software's About dialog or installation directory. Versions 4.60 and earlier are vulnerable.Check Version:
Check the software version through CX-One's Help > About menu or examine the installation directory properties.Verify Fix Applied:
Verify that CX-One version is 4.61 or later through the software's About dialog or installation properties.📡 Detection & Monitoring
Log Indicators:
- Unexpected process crashes of CX-One components
- Unusual local user activity on CX-One systems
- Suspicious child processes spawned from CX-One
Network Indicators:
- Unusual outbound connections from CX-One systems
- Anomalous network traffic patterns from industrial control segments
SIEM Query:
Process Creation where Parent Process Name contains 'CX-One' AND Command Line contains unusual parameters OR Destination IP not in allowed list