OTPulse

Omron CX-Supervisor (Update A)

Plan PatchCVSS 8.5ICS-CERT ICSA-18-072-01Mar 13, 2018
Omron
Attack path
Attack VectorNetwork
Auth RequiredLow
ComplexityLow
User InteractionNone needed
Summary

CX-Supervisor versions 3.40 and earlier contain multiple memory corruption vulnerabilities (buffer overflow, use-after-free, out-of-bounds write) in its process memory handling. These are tracked as CWE-121, CWE-416, CWE-824, CWE-415, CWE-787, CWE-822, and CWE-122. Successful exploitation could allow remote code execution on systems running vulnerable versions. Omron has released version 3.4.1 to address these issues. The advisory notes that these vulnerabilities are not exploitable remotely without authentication, and no public exploits are currently known.

What this means
What could happen
Successful exploitation could allow remote code execution on CX-Supervisor engineering workstations, potentially enabling an attacker to manipulate control logic, alter setpoints, or disrupt supervisory operations across connected devices.
Who's at risk
Water utilities and municipal electric utilities using Omron CX-Supervisor (version 3.40 or earlier) for HMI/SCADA engineering and configuration. This affects engineering workstations and supervisory control systems that manage process automation, RTUs, and remote I/O devices across water treatment, distribution, or power generation plants.
How it could be exploited
An attacker with network access and valid engineering credentials (or obtained credentials) could exploit memory corruption vulnerabilities (buffer overflow, use-after-free) in CX-Supervisor to execute arbitrary code on the workstation. The attacker would need to interact with the CX-Supervisor application or send crafted network packets to trigger the vulnerability.
Prerequisites
  • Network access to the CX-Supervisor workstation (port varies by configuration, typically internal network)
  • Valid engineering workstation credentials or ability to authenticate to CX-Supervisor
  • CX-Supervisor version 3.40 or earlier running on target system
  • User interaction or ability to reach the vulnerable code path in the application
Remotely exploitable via networkRequires authentication (engineering credentials)Multiple memory corruption vulnerabilities (buffer overflow, use-after-free)Could lead to remote code execution on engineering workstationsNo known public exploits at time of advisory
Exploitability
Unlikely to be exploited — EPSS score 0.1%
Affected products (1)
ProductAffected VersionsFix Status
CX-Supervisor:≤ 3.403.4.1
Remediation & Mitigation
0/4
Do now
0/1
WORKAROUNDRestrict network access to CX-Supervisor workstations to only authorized engineering and IT staff; use firewall rules to block unnecessary connections
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HOTFIXUpdate CX-Supervisor to version 3.4.1 or later
Long-term hardening
0/2
HARDENINGImplement network segmentation to isolate CX-Supervisor and control system networks from the business/Internet-facing network
HARDENINGIf remote access to CX-Supervisor is required, require VPN with multi-factor authentication and enforce VPN client security hardening
View full CISA ICS-CERT advisory
API: /api/v1/advisories/446616e5-7a5d-4048-9da2-9872bb704ce5

Get OT security insights every Tuesday

Advisory breakdowns, a weekly summary, and incident analyses for the people actually defending OT environments. Free, no account required.