7.8 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
6.8 Medium
AI Score
Confidence
High
0.002 Low
EPSS
Percentile
59.2%
Arbiter Systems reported to ICS-CERT that a vulnerability that causes a denial of service (DoS) has been identified in Arbiter Systems Power Sentinel Phasor Measurement Unit. The vulnerability can be exploited remotely. Arbiter Systems has produced a patch that mitigates this vulnerability. OSIsoft tested the patch to validate that it resolves the vulnerability.
The following Arbiter Systems Power Sentinel products are affected:
Successful exploitation of this vulnerability could lead to a DoS.
Impact to individual organizations depends on many factors that are unique to each organization. ICS-CERT recommends that organizations evaluate the impact of the vulnerability based on their operational environment, architecture, and product implementation.
Arbiter Systems manufactures time clocks, power measurement, and power calibration products for use in electricity generation and transmission. These products are used primarily in the United States. Some are deployed to South America and Europe as well.
The Ethernet port on this device stops responding to queries when its buffer is full. Certain types of queries to the Ethernet port, such as port scanning, cause the device to stop responding.
CVE-2012-3012NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-XXXX, 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 these vulnerabilities. A CVSS v2 base score of 7.8 has been assigned; the CVSS vector string is (AV:N/AC:L/Au:N/C:N/I:N/A:C).
This vulnerability can be exploited remotely.
No known public exploits specifically target this vulnerability.
An attacker with a low skill would be able to exploit this vulnerability.
Arbiter Systems recommends that users update firmware to 11June2012 Rev 421 or later. This version is available on the product page for Model 1133A at the company Web site (http://www.arbiter.com/news/index.php?id=261). Users will need to download both the firmware as well as the uploader software to send the firmware to the device.
ICS-CERT encourages asset owners to take additional defensive measures to protect against this and other cybersecurity risks.
The Control Systems Security Program (CSSP) also provides a section for control systems security recommended practices on the CSSP Web page. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.CSSP Recommended Practices, http://www.us-cert.gov/control_systems/practices/Recommended_Practices.html, Web site last accessed September 05, 2012.
Additional mitigation guidance and recommended practices are publicly available in the ICS-CERT Technical Information Paper ICS-TIP-12-146-01AβCyber Intrusion Mitigation Strategies.Cyber Intrusion Mitigation Strategies, http://www.us-cert.gov/control_systems/pdf/ICS-TIP-12-146-01A.pdf, Web site last accessed September 05, 2012.
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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