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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-19-318-04) Omron CX-Supervisor (Update A)
20 December 2019
AusCERT Security Bulletin Summary
Product: Omron CX-Supervisor
Operating System: Windows
Impact/Access: Administrator Compromise -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
CVE Names: CVE-2019-18251
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ICS Advisory (ICSA-19-318-04)
Omron CX-Supervisor (Update A)
Original release date: December 19, 2019
All information products included in http://ics-cert.us-cert.gov are
provided"as is" for informational purposes only. The Department of Homeland
Security (DHS) does not provide any warranties of any kind regarding any
information contained within. DHS does not endorse any commercial product or
service, referenced in this product or otherwise. Further dissemination of this
product is governed by the Traffic Light Protocol (TLP) marking in the header.
For more information about TLP, see http://www.us-cert.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 8.8
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Omron
o Equipment: CX-Supervisor
o Vulnerability: Use of Obsolete Function
2. UPDATE INFORMATION
This updated advisory is a follow-up to the original advisory titled
ICSA-19-318-04 Omron CX-Supervisor that was published November 14, 2019, on the
ICS webpage on us-cert.gov.
3. RISK EVALUATION
Successful exploitation of this vulnerability could result in information
disclosure, total compromise of the system, and system unavailability.
4. TECHNICAL DETAILS
4.1 AFFECTED PRODUCTS
The following versions of both "Full Development" and "Runtime Only" packages
of Omron's SCADA and HMI package CX-Supervisor are affected:
o CX-Supervisor Versions 3.5 (12) and prior
4.2 VULNERABILITY OVERVIEW
4.2.1 USE OF OBSOLETE FUNCTION CWE-477
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Omron CX-Supervisor ships with TeamViewer Version 5.0.8703 QS. This version of
TeamViewer is vulnerable to an obsolete function vulnerability that requires
user interaction to exploit. Version 5.0.8703 QS of TeamViewer is vulnerable to
the items listed at the following location: Version 5.0.8703 QS TeamViewer
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CVE-2019-18251 has been assigned to this vulnerability. A CVSS v3 base score of
8.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:R/S:U/
o CRITICAL INFRASTRUCTURE SECTORS: Energy
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Japan
Michael DePlante of Trend Micro's Zero Day Initiative reported this
vulnerability to CISA.
Omron recommends users update to CX-Supervisor Version 3.51 (9). The following
link contains Omron's explanation for the changes and instructions to obtain
the update: CX-Supervisor Version 3.51 (9) update .
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
o When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing that VPNs may have vulnerabilities and should
be updated to the most current version available. Also recognize that VPN
is only as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices
on the ICS webpage on us-cert.gov . Several recommended practices are available
for reading and download, including Improving Industrial Control Systems
Cybersecurity with Defense-in-Depth Strategies .
Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage on us-cert.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.
CISA also recommends users take the following measures to protect themselves
from social engineering attacks:
o Do not click web links or open unsolicited attachments in email messages.
o Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
o Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
No known public exploits specifically target this vulnerability.
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