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AUSCERT External Security Bulletin Redistribution
ESB-2018.1161
Advisory (ICSA-18-102-01) Yokogawa CENTUM and Exaopc
16 April 2018
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AusCERT Security Bulletin Summary
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Product: Yokogawa CENTUM
Yokogawa Exaopc
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Unauthorised Access -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2018-8838
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-18-102-01
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Advisory (ICSA-18-102-01) Yokogawa CENTUM and Exaopc
Original release date: April 12, 2018 | Last revised: April 13, 2018
Legal Notice
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
CVSS v3 6.5
Vendor: CENTUM
Equipment: CENTUM series and Exaopc
Vulnerability: Permissions, Privileges, and Access Controls
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow a local attacker to
generate false system or process alarms, or block system or process alarm
displays.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Yokogawa products are affected:
CENTUM series
CENTUM CS 1000 all versions,
CENTUM CS 3000 versions R3.09.50 and prior,
CENTUM CS 3000 Small versions R3.09.50 and prior,
CENTUM VP versions R6.03.10 and prior,
CENTUM VP Small versions R6.03.10 and prior,
CENTUM VP Basic versions R6.03.10 and prior.
Exaopc versions R3.75.00 and prior,
B/M9000 CS all versions, and B/M9000 VP versions R8.01.01 and prior.
3.2 VULNERABILITY OVERVIEW
3.2.1 PERMISSIONS, PRIVILEGES, AND ACCESS CONTROLS CWE-264
A weakness in access controls may allow a local attacker to exploit the
message management function of the system.
CVE-2018-8838 has been assigned to this vulnerability. A CVSS v3 base score of
6.5 has been calculated; the CVSS vector string is
(AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:H).
3.3 BACKGROUND
Critical Infrastructure Sectors: Critical Manufacturing, Energy, Food and
Agriculture
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Japan
3.4 RESEARCHER
Yokogawa, working with JPCERT, reported this vulnerability to NCCIC.
4. MITIGATIONS
Yokogawa has produced the following mitigations for the affected products.
CENTUM Series
CENTUM CS 1000, CENTUM CS 3000, CENTUM CS 3000 Small No updates will
be provided as these products are at end of support. Yokogawa recommends that
affected users upgrade to the latest CENTUM VP.
CENTUM VP, CENTUM VP Small, CENTUM VP BASIC affected users should
update to version R5.04.B2 or R6.04.00.
Exaopc affected users should update to version R3.76.00
B/M9000CS The vulnerability does not exist in this product however, the
existence of affected software on the same PC may affect alarms for this
device.
B/M9000 VP The vulnerability does not exist in this product however, the
existence of affected software on the same PC may affect alarms for this
device.
Please see Yokogawa Security Advisory Report YSAR-18-0001 at the following
location for more information:
https://web-material3.yokogawa.com/YSAR-18-0001-E.pdf (link is external)
NCCIC recommends that users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet.
Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
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.
NCCIC reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
NCCIC also provides a section for control systems security recommended
practices on the ICS-CERT web page. 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 in the ICS-CERT Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies, available for download from the ICS-CERT website.
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to NCCIC for
tracking and correlation against other incidents.
No known public exploits specifically target this vulnerability. This
vulnerability is not exploitable remotely. High skill level is needed to
exploit.
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