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AUSCERT External Security Bulletin Redistribution
ESB-2016.2604
Moxa OnCell Security Vulnerabilities
4 November 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Moxa OnCell
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2016-8363 CVE-2016-8362
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-16-308-01
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This advisory contains mitigation vulnerabilities for authorization bypass and
disclosed OS commanding vulnerabilities in Moxas OnCell Security Software.
Advisory (ICSA-16-308-01)
Moxa OnCell Security Vulnerabilities
Original release date: November 03, 2016
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 authorization bypass and
disclosed OS commanding vulnerabilities in Moxas OnCell Security Software.
Moxa has produced a new version to mitigate these vulnerabilities.
These vulnerabilities could be exploited remotely.
AFFECTED PRODUCTS
The following Moxa OnCell versions are affected:
OnCellG3470A-LTE,
AWK-1131A/3131A/4131A Series,
AWK-3191 Series,
AWK-5232/6232 Series,
AWK-1121/1127 Series,
WAC-1001 V2 Series,
WAC-2004 Series,
AWK-3121-M12-RTG Series,
AWK-3131-M12-RCC Series,
AWK-5232-M12-RCC Series,
TAP-6226 Series,
AWK-3121/4121 Series,
AWK-3131/4131 Series, and
AWK-5222/6222 Series.
IMPACT
An unauthorized user could download files by accessing a specific URL. An
unauthenticated user is able to execute arbitrary command by web console.
Impact to individual organizations depends on many factors that are unique to
each organization. NCCIC/ICS-CERT recommends that organizations evaluate the
impact of these vulnerabilities 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, OnCell Security Software, is cellular IP gateways that
can connect serial or Ethernet devices to a cellular network. According to
Moxa, OnCell Security Software is deployed across several sectors including
Commercial Facilities, Critical Manufacturing, Energy, and Transportation
Systems. Moxa estimates that this product is used primarily in Asia and
Europe.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
IMPROPER AUTHENTICATION [a]
Any user is able to download log files by accessing a specific URL.
CVE-2016-8362 [b] 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:L/UI:N/S:U/C:H/I:N/A:N).[c]
PERMISSIONS, PRIVILEGES, AND ACCESS CONTROLS [d]
User is able to execute arbitrary OS commands on the server.
CVE-2016-8363 [e] has been assigned to this vulnerability. A CVSS v3 base score
of 9.1 has been assigned; the CVSS vector string is
(AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H).[f]
VULNERABILITY DETAILS
EXPLOITABILITY
These vulnerabilities could be exploited remotely.
EXISTENCE OF EXPLOIT
No known public exploits specifically target these vulnerabilities.
DIFFICULTY
An attacker with a low skill would be able to exploit these vulnerabilities.
MITIGATION
Moxa recommends that users disable HTTP/HTTPS after completing required
configuration through web browser interface. Users can access via SNMP to
enable HTTP/HTTPS if needed. If remote control or monitoring is required,
users should enable IP Protocol Filter feature of OnCell/AWK products to
prevent any unauthorized access to the administrative web management
interface.
Moxa has developed the following patch plan.
Product Firmware Update Release Date
OnCellG3470A-LTE November 1, 2016
AWK-1131A/3131A/4131A Series November 1, 2016
AWK-3191 Series May 31, 2017
AWK-5232/6232 Series May 31, 2017
AWK-1121/1127 Series June 30, 2017
WAC-1001 V2 Series June 30, 2017
WAC-2004 Series June 30, 2017
AWK-3121-M12-RTG Series June 30, 2017
AWK-3131-M12-RCC Series June 30, 2017
AWK-5232-M12-RCC Series June 30, 2017
No future updates are planned for the following models:
TAP-6226 Series,
AWK-3121/4121 Series,
AWK-3131/4131 Series, and
AWK-5222/6222 Series.
Users should contact Moxa if further assistance is needed for these models at:
http://www.moxa.com/support/request_support.aspx (link is external).
ICS-CERT recommends that users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. 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. 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.
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-287: Improper Authentication,
https://cwe.mitre.org/data/definitions/287.html, web site last accessed
November 03, 2016.
b. NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-8362, 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:L/UI:N/S...,
web site last accessed November 03, 2016.
d. CWE-264: Permissions, Privileges, and Access Controls,
https://cwe.mitre.org/data/definitions/264.html, web site last accessed
November 03, 2016.
e. NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-8363, NIST
uses this advisory to create the CVE web site report. This web site will be
active sometime after publication of this advisory.
f. CVSS Calculator,
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S...,
web site last accessed November 03, 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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