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AUSCERT External Security Bulletin Redistribution
ESB-2016.1755
Moxa MGate Authentication Bypass Vulnerability
15 July 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Moxa MGate
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-5804
Original Bulletin:
http://ics-cert.us-cert.gov/advisories/ICSA-16-196-02
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Advisory (ICSA-16-196-02)
Moxa MGate Authentication Bypass Vulnerability
Original release date: July 14, 2016
Legal Notice
All information products included in http://ics-cert.us-cert.gov are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
referenced in this product or otherwise. Further dissemination of this product
is governed by the Traffic Light Protocol (TLP) marking in the header. For
more information about TLP, see http://www.us-cert.gov/tlp/.
OVERVIEW
Independent researcher Maxim Rupp has identified an authentication bypass
vulnerability in Moxas MGate products. Moxa has produced new firmware versions
to mitigate this vulnerability.
This vulnerability could be exploited remotely.
AFFECTED PRODUCTS
Moxa reports that the vulnerability affects the following products:
MGate MB3180, versions prior to v1.8,
MGate MB3280, versions prior to v2.7,
MGate MB3480, versions prior to v2.6,
MGate MB3170, versions prior to v2.5, and
MGate MB3270, versions prior to v2.7
IMPACT
A successful exploit of this vulnerability may allow an attacker to log in as
a valid user.
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.
BACKGROUND
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, MGate, is a serial to Ethernet modbus gateway. According
to Moxa, MGate is deployed across several sectors, including Chemical,
Commercial Facilities, Critical Manufacturing, Emergency Services, Energy,
Food and Agriculture, Government Facilities, and Water and Wastewater Systems.
Moxa estimates that this product is used globally but concentrated in the US,
Europe, South America, and Taiwan.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
INADEQUATE ENCRYPTION STRENGTH [a]
An attacker can use accessible information to brute force a parameter that
will allow a bypass of authentication mechanisms.
CVE-2016-5804 [b] has been assigned to this vulnerability. A CVSS v3 base score
of 9.1 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N). [c]
VULNERABILITY DETAILS
EXPLOITABILITY
This vulnerability could be exploited remotely.
EXISTENCE OF EXPLOIT
No known public exploits specifically target this vulnerability.
DIFFICULTY
An attacker with a low skill would be able to exploit this vulnerability.
MITIGATION
Moxa has released new versions of firmware, which has enhanced the security of
the MB3x70 and MB3x80 families. This new firmware can be located on its web
site at the following locations:
MB3180, v1.8, MB3280, v2.7, and MB3480, v2.6
http://www.moxa.com/support/sarch_result.aspx?type=soft&prod_id=73&type_id=4
(link is external)
MB3170, v2.5 and MB3270, v2.7
http://www.moxa.com/support/sarch_result.aspx?type=soft&prod_id=74&type_id=4
(link is external)
ICS-CERT recommends that users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
Minimize network exposure for all control system devices and/or systems, and
ensure that they are not accessible from the Internet.
Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be
updated to the most current version available. Also recognize that VPN is only
as secure as the connected devices.
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 ICSCERT 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.
a. CWE-326: Inadequate Encryption Strength,
http://cwe.mitre.org/data/definitions/326.html, web site last accessed July
14, 2016.
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-5804, NIST
uses this advisory to create the CVE web site report. This web site will be
active sometime after publication of this advisory.
c. CVSS Calculator,
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S...,
web site last accessed July 14, 2016.
Contact Information
For any questions related to this report, please contact ICS-CERT at:
Email: ics-cert@hq.dhs.gov (link sends e-mail)
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900
For industrial control systems security information and incident reporting:
http://ics-cert.us-cert.gov
ICS-CERT continuously strives to improve its products and services. You can
help by choosing one of the links below to provide feedback about this
product.
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