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AUSCERT External Security Bulletin Redistribution
ESB-2020.2759.2
Advisory (icsa-20-224-01) Yokogawa CENTUM
6 January 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: CENTUM
Publisher: US-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Create Arbitrary Files -- Remote/Unauthenticated
Overwrite Arbitrary Files -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-5609 CVE-2020-5608
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-20-224-01
Revision History: January 6 2021: Exaopc now listed as vulnerable
August 12 2020: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
ICS Advisory (ICSA-20-224-01)
Yokogawa CENTUM (Update A)
Original release date: January 05, 2021
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 8.1
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Yokogawa
o Equipment: CENTUM
o Vulnerabilities: Improper Authentication, Path Traversal
2. UPDATE INFORMATION
This updated advisory is a follow-up to the original advisory titled
ICSA-20-224-01 Yokogawa CENTUM that was published August 11, 2020, on the ICS
webpage on us-cert.cisa.gov.
3. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow a remote
unauthenticated attacker to send tampered communication packets or create/
overwrite any file and run any commands.
4. TECHNICAL DETAILS
4.1 AFFECTED PRODUCTS
Yokogawa reports that the vulnerability affects the following CENTUM
distributed control system products:
- --------- Begin Update A Part 1 of 2 ---------
o Exaopc (R3.72.00 - R3.78.00)
- --------- End Update A Part 1 of 2 ---------
o CENTUM CS 3000 versions R3.08.10 - R3.09.50 (Including CENTUM CS 3000 Entry
Class)
o CENTUM VP versions R4.01.00 - R6.07.00 (Including CENTUM VP Entry Class)
o B/M9000CS versions R5.04.01 - R5.05.01
o B/M9000 VP versions R6.01.01 - R8.03.01
4.2 VULNERABILITY OVERVIEW
4.2.1 IMPROPER AUTHENTICATION CWE-287
This vulnerability may allow a remote unauthenticated attacker to send tampered
communication packets.
CVE-2020-5608 has been assigned to this vulnerability. A CVSS v3 base score of
8.1 has been assigned; the CVSS vector string is ( AV:A/AC:L/PR:N/UI:N/S:U/C:N/
I:H/A:H ).
4.2.2 PATH TRAVERSAL CWE-22
This vulnerability may allow a remote attacker to create or overwrite any file,
run any commands.
CVE-2020-5609 has been assigned to this vulnerability. A CVSS v3 base score of
8.1 has been assigned; the CVSS vector string is ( AV:A/AC:L/PR:N/UI:N/S:U/C:N/
I:H/A:H ).
4.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy, Food and
Agriculture
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Japan
4.4 RESEARCHER
Nataliya Tlyapova, Ivan Kurnakov, and Positive Technologies reported these
vulnerabilities to Yokogawa.
5. MITIGATIONS
Yokogawa recommends the following mitigations:
- --------- Begin Update A Part 2 of 2 ---------
o Exaopc R3.72.00 - R3.78.00: Update to R3.78.10 or later.
- --------- End Update A Part 2 of 2 ---------
o For CENTUM CS 3000 (including CENTUM CS 3000 Entry Class) R3.08.10 -
R3.09.50 and CENTUM VP (including CENTUM VP Entry Class) R4.01.00 -
R4.03.00, no patch will be available because these products are already end
of support. Yokogawa recommends that affected customers upgrade to the
latest revision of CENTUM VP.
o For CENTUM VP (including CENTUM VP Entry Class) R5.01.00 - R5.04.20, apply
patch R5.04.D1
o For CENTUM VP (including CENTUM VP Entry Class) R6.01.00 - R6.07.00, apply
patch R6.07.11
o For B/M9000CS R5.04.01 - R5.05.01 and B/M9000 VP R6.01.01 - R8.03.01,
Yokogawa reports that this product is not affected by the vulnerabilities
but is affected by the existence of CENTUM CS 3000 installed on the same
PC. If CENTUM CS 3000 is installed, update B/M90000CS to suitable revision.
If CENTUM VP is installed on the same PC, update to B/M90000 VP to suitable
revision.
For questions related to this report, please contact Yokogawa support .
More details can also be found in Yokogawa's security advisory report number
YSAR-20-0001
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
Strategies .
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.
No known public exploits specifically target these vulnerabilities.
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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