ESB-2018.1161 - [Win] Yokogawa CENTUM and Yokogawa Exaopc: Unauthorised access - Existing account 2018-04-16

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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
        ---------------------------------

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

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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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