This updated advisory is a follow-up to the original advisory titled ICSA-16-336-02 Moxa NPort Device Vulnerabilities that was published December 1, 2016, on the NCCIC/ICS-CERT web site.
Security researchers Reid Wightman of RevICS Security, Mikael Vingaard, and Maxim Rupp have identified vulnerabilities in Moxaโs NPort serial device servers. Moxa has produced new firmware versions to mitigate these vulnerabilities.
These vulnerabilities could be exploited remotely.
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Moxa reports that the vulnerability affects the following versions of NPort:
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Successful exploitation of these vulnerabilities could lead to the complete compromise of an affected system.
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.
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 products, NPort devices, connect serial devices to Ethernet networks. According to Moxa, NPort devices are deployed across several sectors including Critical Manufacturing, Energy, and Transportation Systems. Moxa estimates that these products are used worldwide.
Administration passwords can be retried without authenticating.
CVE-2016-9361b has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).c
Firmware can be updated over the network without authentication, which may allow remote code execution.
CVE-2016-9369e has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).f
Buffer overflow vulnerability may allow an unauthenticated attacker to remotely execute arbitrary code.
CVE-2016-9363h has been assigned to this vulnerability. A CVSS v3 base score of 7.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).i
User-controlled input is not neutralized before being output to web page.
CVE-2016-9371k has been assigned to this vulnerability. A CVSS v3 base score of 6.1 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).l
Requests are not verified to be intentionally submitted by the proper user.
CVE-2016-9365n has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).o
An attacker can freely use brute force to determine parameters needed to bypass authentication.
CVE-2016-9366q has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).r
A configuration file contains parameters that represent passwords in plaintext.
CVE-2016-9348t has been assigned to this vulnerability. A CVSS v3 base score of 3.3 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N).u
The amount of resources requested by a malicious actor is not restricted, leading to a denial-of-service caused by resource exhaustion.
CVE-2016-9367w has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).x
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.
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Moxa has released new firmware versions, which address the identified vulnerabilities in all but one of the affected NPort devices. Moxa recommends installing the new firmware version.
http://www.moxa.com/support/download.aspx?type=support&id=882
http://www.moxa.com/support/download.aspx?type=support&id=356
http://www.moxa.com/support/download.aspx?type=support&id=904
http://www.moxa.com/support/download.aspx?type=support&id=925
http://www.moxa.com/support/download.aspx?type=support&id=905
http://www.moxa.com/support/download.aspx?type=support&id=1403
http://www.moxa.com/support/download.aspx?type=support&id=1462
http://www.moxa.com/support/download.aspx?type=support&id=2206
http://www.moxa.com/support/download.aspx?type=support&id=2207
http://www.moxa.com/support/download.aspx?type=support&id=2208
http://www.moxa.com/support/download.aspx?type=support&id=938
http://www.moxa.com/support/download.aspx?type=support&id=1819
http://www.moxa.com/support/download.aspx?type=support&id=1469
http://www.moxa.com/support/download.aspx?type=support&id=733
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Moxa has reported that the NPort 6110 device was discontinued in December 2008 and will not have patches released to address these vulnerabilities. Moxa recommends that customers using the NPort 6110 should upgrade the affected device.
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. 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 ICSโCERT Technical Information Paper, ICS-TIP-12-146-01BโTargeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT web site.
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.
Contact Information
For any questions related to this report, please contact the CISA at:
Email: [email protected]
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For industrial control systems cybersecurity information: https://us-cert.cisa.gov/ics
or incident reporting: https://us-cert.cisa.gov/report
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www.moxa.com/support/download.aspx?type=support&id=1403
www.moxa.com/support/download.aspx?type=support&id=1462
www.moxa.com/support/download.aspx?type=support&id=1469
www.moxa.com/support/download.aspx?type=support&id=1819
www.moxa.com/support/download.aspx?type=support&id=2206
www.moxa.com/support/download.aspx?type=support&id=2207
www.moxa.com/support/download.aspx?type=support&id=2208
www.moxa.com/support/download.aspx?type=support&id=356
www.moxa.com/support/download.aspx?type=support&id=733
www.moxa.com/support/download.aspx?type=support&id=882
www.moxa.com/support/download.aspx?type=support&id=904
www.moxa.com/support/download.aspx?type=support&id=905
www.moxa.com/support/download.aspx?type=support&id=925
www.moxa.com/support/download.aspx?type=support&id=938
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