16 April 2018
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.1161 Advisory (ICSA-18-102-01) Yokogawa CENTUM and Exaopc 16 April 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- 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 - --------------------------BEGIN INCLUDED TEXT-------------------- 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. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to firstname.lastname@example.org and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. 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