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AUSCERT External Security Bulletin Redistribution
ESB-2015.2271
Innominate mGuard VPN Vulnerability
31 August 2015
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AusCERT Security Bulletin Summary
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Product: Innominate mGuard devices
Publisher: US-CERT
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-3966
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-15-239-03
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Advisory (ICSA-15-239-03)
Innominate mGuard VPN Vulnerability
Original release date: August 27, 2015
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
Innominate mGuard has self identified a denial-of-service (DoS) vulnerability
in the Innominate mGuard device. Inominate has produced a patch to mitigate
this vulnerability.
This vulnerability could be exploited remotely.
AFFECTED PRODUCTS
The following mGuard versions are affected:
Innominate mGuard firmware, Version 8.0.0 to Version8.1.6.
IMPACT
Successful exploitation of this vulnerability could result in a DoS condition.
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
Innominate is a German-based company that sells products worldwide through its
international partners.
The affected products, the mGuard family of products, are industrial security
routers. They can be found in many critical infrastructure sectors, including
Communications, Critical Manufacturing, and Healthcare and Public Health.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
DOS OF VPN DAEMON [a]
It is possible to cause a temporary DoS condition on the VPN daemon on the VPN
waiting side if the VPN initiating peer has the option IPsec compression
enabled.
CVE-2015-3966 [b] has been assigned to this vulnerability. A CVSS v2 base
score of 7.8 has been assigned; the CVSS vector string is
(AV:N/AC:L/Au:N/C:N/I:N/A:C). [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
Innominate has released firmware patches for the affected versions, Versions
8.0.0 through 8.1.6 that mitigate the vulnerability in the mGuard firmware.
Innominate recommends that customers using firmware versions older than
Version 7, which are no longer being maintained, should upgrade to mGuard
firmware Version 8.1.7. Innominate also recommends that customers limit access
to the administrative interfaces to a minimum via firewall rules.
For additional information on the vulnerability, Innominates security advisory
is available on its web site at:
http://www.innominate.com/data/downloads/software/innominate_security_ad...
Innominates firmware updates are available on its web site at:
http://www.innominate.com/en/downloads/updates.
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 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-272: Least Privilege Violation
https://cwe.mitre.org/data/definitions/272.html, web site last accessed August
27, 2015.
b. NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-3966,
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
http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:L/Au:N/C:N/I:N/A:C web
site last accessed August 27, 2015.
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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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
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