4.9 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
HIGH
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:H/Au:S/C:N/I:N/A:C
5.8 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:H
0.002 Low
EPSS
Percentile
54.1%
NCCIC/ICS-CERT has received information from a third party that identified a firmware overwrite vulnerability in Moxa’s UC 7408-LX-Plus device. Moxa has produced instructions to reduce exposure to this vulnerability. The Moxa UC 7408-LX-Plus device has been discontinued.
This vulnerability could be exploited remotely.
The following Moxa UC-7408 versions are affected:
A firmware overwrite has been used that is neither recoverable in the field or by the manufacturer, necessitating the replacement of the device.
Impact to individual organizations depends on many factors that are unique to each organization. ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation.
Moxa is a Taiwan-based company that maintains offices in several countries around the world, including the US, UK, India, Germany, France, China, Russia, and Brazil.
The affected product, UC-7408-LX-Plus, is an embedded computer. According to Moxa, these computers are deployed across several sectors, including Chemical, Commercial Facilities, Critical Manufacturing, Emergency Services, Energy, Food and Agriculture, Government Facilities, Water and Wastewater Systems, and others. Moxa estimates that this product is used globally but concentrated in the US, Europe, Chile, Argentina, Peru, Columbia, and Taiwan, with 50 to 60 percent of all sales in the US.
The firmware overwrite is neither recoverable in the field or by the manufacturer, necessitating the replacement of the device.
CVE-2016-4500NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4500, 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. A CVSS v3 base score of 5.8 has been assigned; the CVSS vector string is (AV:N/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:H).CVSS Calculator, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:H, web site last accessed May 31, 2016.
This vulnerability could be exploited remotely.
No known public exploits specifically target this vulnerability.
Crafting a working exploit for this vulnerability would be difficult. Root level access is necessary for this exploit. This decreases the likelihood of a successful exploit.
Moxa recommends the following suggestions to reduce the risk of unauthorized access to UC 7408-LX-Plus:
ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:
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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4.9 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
HIGH
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:H/Au:S/C:N/I:N/A:C
5.8 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:H
0.002 Low
EPSS
Percentile
54.1%