ICS Advisory (ICSA-19-274-02)

Yokogawa Products

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1. EXECUTIVE SUMMARY

  • CVSS v3 8.4
  • ATTENTION: Low skill level to exploit
  • Vendor: Yokogawa
  • Equipment: Exaopc, Exaplog, Exaquantum, Exasmoc, Exarqe, GA10, and InsightSuiteAE
  • Vulnerability: Unquoted Search Path or Element

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow a local attacker to execute malicious files.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Yokogawa reports this vulnerability affects the following products:

  • Exaopc (R1.01.00 - R3.77.00)
  • Exaplog (R1.10.00 - R3.40.00)
  • Exaquantum (R1.10.00 - R3.02.00)
  • Exaquantum/Batch (R1.01.00 - R2.50.40)
  • Exasmoc (All Revisions)
  • Exarqe (All Revisions)
  • GA10 (R1.01.01 - R3.05.01)
  • InsightSuiteAE (R1.01.00 - R1.06.00)

3.2 VULNERABILITY OVERVIEW

3.2.1    UNQUOTED SEARCH PATH OR ELEMENT CWE-428

Service paths in some Yokogawa applications are unquoted and contain spaces. This may allow a local attacker to execute malicious files by the service privilege.

CVE-2019-6008 has been assigned to this vulnerability. A CVSS v3 base score of 8.4 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:N/S:U/C:H/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 reported this vulnerability to JPCERT and CISA.

4. MITIGATIONS

Yokogawa has provided the following countermeasures for this vulnerability in each of the affected products:

  • Exaopc R1.01.00 – R3.77.00: Update to the latest revision (R3.78.00)
  • Exaplog:
  • R1.10.00 - R3.30.00: Update to the latest revision (R3.40.00) and apply patch software for R3.40.06
  • R3.40.00: Apply patch software for R3.40.06
  • Exaquantum R1.10.00 - R3.02.00: Update to the latest revision (R3.15.00)
  • Exaquantum/Batch R1.01.00 - R2.50.40: Update to the latest revision (R3.10.00
  • Exasmoc:  Support will end for all revisions of Exasmoc on Sep 30, 2019. Consider migrating to Platform for Advanced Control and Estimation which is the successor to Exasmoc
  • Exarqe:  Support will end for all revisions of Exarqe on Sep 30, 2019. Consider migrating to Platform for Advanced Control and Estimation which is the successor to Exarqe
  • GA10 R1.01.01 - R3.05.01: Update to the latest revision (R3.05.06)
  • InsightSuiteAE R1.01.00 - R1.06.00: Update to the latest revision (R1.07.00)

Yokogawa states patching is the best protection against this vulnerability. If it is not possible to patch, please consult with specialists at Yokogawa on the next best course of action.

Yokogawa recommends all users have a security program consisting of patch updates, anti-virus, backup and recovery, zoning, hardening, whitelisting, firewall, etc. Yokogawa can assist in setting up the security program and can perform security risk

assessments.
For more information about this vulnerability and the associated mitigations, please see Yokogawa’s security advisory report YSAR-19-0003.

CISA recommends 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.

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 this vulnerability. This vulnerability is not exploitable remotely.


Contact Information

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