2.1 Low
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:N/I:N/A:P
0.001 Low
EPSS
Percentile
28.3%
Alexander Bolshev of Digital Security has identified an improper input vulnerability in the CodeWrights GmbH HART Device Type Manager (DTM) library utilized in Yokogawa’s HART Device DTM. CodeWrights GmbH has addressed the vulnerability with a new library, which both companies have begun to integrate.
The Yokogawa HART Device DTM used by the following devices is impacted:
The vulnerability causes a buffer overflow in the HART Device DTM crashing the Field Device Tool (FDT) Frame Application. The Frame Application must then be restarted. The Frame Application is primarily used for remote configuration. Exploitation of this vulnerability does not result in loss of information, control, or view by the control system of the HART devices on the 4-20mA HART Loop.
Impact to individual organizations depends on many factors that are unique to each organization. NCCIC/ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation.
Yokogawa is a company based in Japan that maintains offices in several countries around the world, including the Americas, Europe, the Middle East, Africa, South Asia, and East Asia.
The affected product is the DTM library used by Yokogawa HART-based field devices in the FDT/DTM Frame Application. According to Yokogawa, these products are deployed across multiple critical infrastructure sectors. Yokogawa estimates that these products are used worldwide.
Successful injection of specially crafted packets to the Device DTM causes a buffer overflow condition in the Frame Application. The FDT Frame Application becomes unresponsive, and the Device DTM stops functioning.
CVE-2014-9191NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-9191, web site last accessed February 17, 2015. has been assigned to this vulnerability. A CVSS v2 base score of 1.8 has been assigned; the CVSS vector string is (AV:A/AC:H/Au:N/C:N/I:N/A:P).CVSS Calculator, http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:A/AC:H/Au:N/C:N/I:N/A:P, web site last accessed February 17, 2015.
This exploit on the FDT/DTM Frame Application is possible from any adjacent network that receives or passes packets from the HART Device DTM.
No known public exploits specifically target this vulnerability.
This is a complex vulnerability. Crafting a working exploit for this vulnerability would be difficult. Compromised access that allows access to the packets transmitted to Frame Application is required for exploitation. This exploit also requires a specific timing to crash the Frame Application. This increases the difficulty of a successful exploit.
Yokogawa has released an advisory (YSAR-15-0001) to address this issue. It can be found at the following location:
<http://www.yokogawa.com/dcs/security/ysar/YSAR-15-0001E.pdf>
Please contact your local Yokogawa office to obtain the latest version to mitigate this vulnerability. There are offices worldwide; North American office contact information is listed on the following web site:
<http://www.yokogawa.com/us/contact/index.htm#find-a-yokogawa-office>
JPCERT has also released an advisory (JVNVU # 96347573) to disclose this information. It can be found in the following location:
<http://jvn.jp/vu/JVNVU96347573/index.html> (Japanese)
ICS-CERT encourages asset owners to take additional defensive measures to protect against this and other cybersecurity risks.
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. ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
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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