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AUSCERT External Security Bulletin Redistribution
ESB-2016.2981
Moxa DACenter Vulnerabilities
15 December 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Moxa DACenter
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Remote with User Interaction
Resolution: Alternate Program
CVE Names: CVE-2016-9356 CVE-2016-9354
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-16-348-02
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Advisory (ICSA-16-348-02)
Moxa DACenter Vulnerabilities
Original release date: December 13, 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 Zhou Yu has identified denial-of-service and
unquoted service path privilege escalation vulnerabilities in Moxa's
DACenter application. Moxa has produced a patch to mitigate these
vulnerabilities. Zhou Yu has tested the patch to validate that it resolves
the vulnerabilities.
These vulnerabilities could be exploited remotely.
AFFECTED PRODUCTS
Moxa reports that the vulnerability affects the following versions of
DACenter:
Versions 1.4 and older.
IMPACT
The vulnerabilities may render the DACenter application unavailable and
also allow an authorized but nonprivileged local user to execute arbitrary
code with privileges on the system.
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, DACenter, provides a standard OPC interface
that interacts with Moxa Active OPC Server for real-time data
collection. According to Moxa, DACenter is deployed across several sectors
including Commercial Facilities, Critical Manufacturing, Energy, Water and
Wastewater Systems, and others. Moxa estimates that this product is used
primarily in the United States and Europe with a small percentage in Asia.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
RESOURCE EXHAUSTION[a]
A specially crafted project file may cause the program to crash.
CVE-2016-9354[b] has been assigned to this vulnerability. A CVSS
v3 base score of 5.5 has been assigned; the CVSS vector string is
(AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).[c]
UNQUOTED SEARCH PATH OR ELEMENT[d]
The application may suffer from an unquoted search path issue.
CVE-2016-9356[e] has been assigned to this vulnerability. A CVSS
v3 base score of 8.8 has been assigned; the CVSS vector string is
(AV:L/AC:L/PR:L/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 replacing existing DACenter installations with the new
software MX-AOPC UA suite. DACenter is nearing end-of-life by the end of
2016, and no further updates will be issued.
For existing DACenter installations, Moxa recommends contacting the Moxa
Technical Support team or visiting the Moxa technical support web page at:
http://www.moxa.com/support
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 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.
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-400: Uncontrolled Resource Consumption ('Resource Exhaustion'),
https://cwe.mitre.org/data/definitions/400.html, web site last accessed
December 13, 2016.
b.
NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9354,
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:L/AC:L/PR:N/UI:R/S...,
web site last accessed December 13, 2016.
d.
CWE-428: Unquoted Search Path or Element,
https://cwe.mitre.org/data/definitions/428.html, web site last accessed
December 13, 2016.
e.
NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9356,
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:L/AC:L/PR:L/UI:N/S...,
web site last accessed December 13, 2016.
Contact Information
For any questions related to this report, please contact ICS-CERT at:
Email: ics-cert@hq.dhs.gov
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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