4.4 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:M/Au:N/C:P/I:P/A:P
6.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:H
0.0004 Low
EPSS
Percentile
0.4%
Successful exploitation of this vulnerability could allow a local attacker to generate false system or process alarms, or block system or process alarm displays.
The following versions of Yokogawa products are affected:
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).
Yokogawa, working with JPCERT, reported this vulnerability to NCCIC.
Yokogawa has produced the following mitigations for the affected products.
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>
NCCIC recommends that users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
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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4.4 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:M/Au:N/C:P/I:P/A:P
6.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:H
0.0004 Low
EPSS
Percentile
0.4%