10 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10 High
AI Score
Confidence
High
0.011 Low
EPSS
Percentile
84.8%
Yokogawa Electric Corporation has notified NCCIC/ICS-CERT of stack-based buffer overflow vulnerabilities in multiple Yokogawa products. Yokogawa has released product revisions that mitigate the vulnerabilities for many of the vulnerable products.
These vulnerabilities could be exploited remotely.
The following Yokogawa products are affected:
Successful exploitation of these vulnerabilities could result in a denial-of-service condition impacting network communications and allow arbitrary code execution.
Impact to individual organizations depends on many factors that are unique to each organization. ICS-CERT recommends that organizations evaluate the impact of these vulnerabilities based on their operational environment, architecture, and product implementation.
Yokogawa is based in Japan and maintains offices in several countries around the world, including the Americas, Europe, the Middle East, Africa, South Asia, and East Asia.
The condensed descriptions of the affected products are provided as a quick reference.
Yokogawa estimates that its products are used worldwide.
A specially crafted packet transmitted to the process that executes control over network communications can cause network communications to become unresponsive.
CVE-2015-5626NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-5626, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. has been assigned to this vulnerability. Yokogawa has assigned a CVSS v2 base score of 10.0; the CVSS vector string is (AV:N/AC:L/Au:N/C:C/I:C/A:C).CVSS Calculator, http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:L/Au:N/C:C/I:C/A:C, web site last accessed September 10, 2015.
A specially crafted packet is transmitted to the process that executes control over network communications can cause the process that uses the communication function to become unavailable.
CVE-2015-5627NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-5627, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. has been assigned to this vulnerability. Yokogawa has assigned a CVSS v2 base score of 10.0; the CVSS vector string is (AV:N/AC:L/Au:N/C:C/I:C/A:C).CVSS Calculator, http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:L/Au:N/C:C/I:C/A:C, web site last accessed September 10, 2015.
A specially crafted packet transmitted to the process that executes control over network communication may allow a remote attackers to execute arbitrary code.
CVE-2015-5628NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-5628, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. has been assigned to this vulnerability. Yokogawa has assigned a CVSS v2 base score of 10.0; the CVSS vector string is (AV:N/AC:L/Au:N/C:C/I:C/A:C).CVSS Calculator, http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:L/Au:N/C:C/I:C/A:C, web site last accessed September 10, 2015.
These vulnerabilities could be exploited remotely.
No known public exploits specifically target these vulnerabilities.
An attacker with low skill would be able to exploit these vulnerabilities.
Yokogawa has released product revisions for multiple affected products that remediate the identified vulnerabilities. Yokogawa’s Security Advisory Report, YSAR-15-0003 Vulnerabilities of Communication Functions in CENTUM, and other YOKOGAWA products are available at the following URL:
http://www.yokogawa.com/dcs/security/ysar/dcs-ysar-index-en.htm
For additional information about the vulnerabilities and to obtain Yokogawa’s product revisions, contact Yokogawa via its Security web site at:
https://plus.yokogawa.co.jp/gw/gw.po?c-id=000498
Yokogawa offers the following recommendations to minimize the risk associated with these vulnerabilities by applying the actions:
Apply properly configured firewall between the external network and control system network to prevent external communication with the affected devices.
Prevent unapproved devices from being connected to the network where vulnerable products are connected.
ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. 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.
ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
ICS-CERT also provides a section for control systems security recommended practices on the ICS-CERT web page at: http://ics-cert.us-cert.gov/content/recommended-practices. 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, that is available for download from the ICS-CERT web site (http://ics-cert.us-cert.gov/).
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to ICS-CERT for tracking and correlation against other incidents.
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10 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10 High
AI Score
Confidence
High
0.011 Low
EPSS
Percentile
84.8%