This updated advisory is a follow-up to the original advisory titled ICSA-16-236-01 Moxa OnCell Vulnerabilities that was published August 23, 2016, on the NCCIC/ICS-CERT web site.
Independent researcher Maxim Rupp has identified several vulnerabilities in Moxaβs OnCell products. Moxa has produced new firmware to mitigate these vulnerabilities.
These vulnerabilities could be exploited remotely.
Moxa reports that the vulnerability affects the following products:
An attacker could exploit these vulnerabilities to bypass authentication to log in as a valid user.
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, OnCell 31XX and 32XX series devices, are cellular IP gateways that can connect serial or Ethernet devices to a cellular network. According to Moxa, OnCell IP gateways are deployed across several sectors including Commercial Facilities, Critical Manufacturing, Energy, and Transportation Systems. Moxa estimates that these products are used primarily in Asia and Europe.
An attacker can freely use brute force to determine parameters needed to bypass authentication.
CVE-2016-5799b 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
A configuration file contains parameters that represent passwords in plaintext.
CVE-2016-5812e 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).f
CROSS-SITE SCRIPTINGg
The reflected cross-site scripting attack may allow an attacker to execute arbitrary script code in the userβs browser within the trust relationship between their browser and the server.
CVE-2016-5819h has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N).i
These vulnerabilities could be exploited remotely.
No known public exploits specifically target these vulnerabilities.
An attacker with a low skill would be able to exploit these vulnerabilities.
Moxa has made firmware fixes available on their web site at the following locations:
http://www.moxa.com/support/sarch_result.aspx?type=soft&prod_id=316&type_id=4
http://www.moxa.com/support/sarch_result.aspx?type=soft&prod_id=416&type_id=4
Moxa offers the following advice for upgrading firmware:
The OnCell G3111/G3151-HSPAβs firmware can be upgraded though the web console, serial console, or through OnCell Search Utility. However, Moxa recommends a local (LAN) connection to the OnCell to minimize the risk of a broken connection during the upgrade process. If you have made any changes to your configuration, remember to save the configuration first before upgrading the firmware. Any unsaved changes will be discarded when the firmware is upgraded. To upgrade the firmware, simply browse to the location of the firmware on your PC, and select Submit.
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 ICSβCERT Technical Information Paper, ICS-TIP-12-146-01BβTargeted 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.
Contact Information
For any questions related to this report, please contact the CISA at:
Email: [email protected]
Toll Free: 1-888-282-0870
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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