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AUSCERT External Security Bulletin Redistribution
ESB-2022.4071
ICS Advisory (icsa-22-228-01) Yokogawa CENTUM Controller FCS
17 August 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Yokogawa CENTUM Controller FCS
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2022-33939
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-22-228-01
Comment: CVSS (Max): 6.5 CVE-2022-33939 (CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVSS Source: ICS-CERT
Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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ICS Advisory (ICSA-22-228-01)
Yokogawa CENTUM Controller FCS
Original release date: August 16, 2022
Legal Notice
All information products included in https://us-cert.cisa.gov/ics 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 https://us-cert.cisa.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 6.5
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Yokogawa
o Equipment: CENTUM VP & CS 3000 Controller FCS
o Vulnerability: Denial of Service
2. RISK EVALUATION
Successful exploitation of this vulnerability could crash the affected device,
resulting in a denial-of-service condition.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Yokogawa reports this vulnerability affects the following CENTUM VP/CS 3000
Controller FCS products:
o CENTUM VP/CS 3000 controller FCS
o CP31, CP33, CP345
o CP401, CP451
3.2 VULNERABILITY OVERVIEW
3.2.1 RESOURCE MANAGEMENT ERRORS CWE-399
The Yokogawa CENTUM VP/CS 3000 Controller FCS is vulnerable to a
denial-of-service attack caused by a malformed packet. This attack may stop
inter-station data link block (ADL) communications.
CVE-2022-33939 has been assigned to this vulnerability. A CVSS v3 base score of
6.5 has been assigned; the CVSS vector string is ( AV:A/AC:L/PR:N/UI:N/S:U/C:N/
I:N/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Multiple Sectors
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Japan
3.4 RESEARCHER
Noriko Takahashi of JPCERT/CC reported this vulnerability to CISA.
4. MITIGATIONS
Yokogawa has listed the following products as vulnerable due to end-of-life
status, with no software patch available:
o CENTUM CS 3000
o CENTUM CS 3000 Entry Class
o CENTUM VP (R4.01.00 to R4.03.00)
o CENTUM VP Entry Class (R4.01.00 to R4.03.00)
Yokogawa has provided software patches for the following vulnerable products:
o CENTUM VP (R5.01.00 to R5.04.20)
o CENTUM VP Entry Class (R6.01.00 to R6.03.00)
For more information and details on implementing these mitigations and
downloading the latest patch, users should see the Yokogawa advisory .
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 they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls and
isolate them from business networks.
o When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing VPNs may have vulnerabilities and should be
updated to the most current version available. Also recognize VPN is only
as secure as its 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 at cisa.gov/ics . Several CISA products detailing cyber
defense best 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 at cisa.gov/ics in the technical information paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing suspected malicious activity should follow established
internal procedures and report findings to CISA for tracking and correlation
against other incidents.
No known public exploits specifically target this vulnerability.
For any questions related to this report, please contact the CISA at:
Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.
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