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AUSCERT External Security Bulletin Redistribution
ESB-2016.1445
KMC Controls Conquest BACnet Router Vulnerabilities
9 June 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: KMC Controls Conquest BACnet Router
Publisher: US-CERT
Operating System: Network Appliance
Impact/Access: Cross-site Request Forgery -- Remote with User Interaction
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2016-4495 CVE-2016-4494
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-16-126-01
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Advisory (ICSA-16-126-01)
KMC Controls Conquest BACnet Router Vulnerabilities
Original release date: June 07, 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
This advisory was originally posted to the US-CERT secure Portal library on
May 5, 2016, and is being released to the NCCIC/ICS-CERT web site.
Independent researcher Maxim Rupp has identified authentication and cross-site
request forgery (CSRF) vulnerabilities in KMC Controls Conquest BACnet routers
through its web interface. KMC Controls has produced new firmware to mitigate
these vulnerabilities. Maxim Rupp has tested the new firmware to validate that
it resolves the vulnerabilities.
These vulnerabilities could be exploited remotely.
AFFECTED PRODUCTS
KMC Controls reports that the vulnerabilities affect the following products:
BAC-5051E routers, firmware versions prior to E0.2.0.2
IMPACT
An unauthorized user can exploit these vulnerabilities to read the
configuration of the target device.
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.
BACKGROUND
KMC Controls is based in the United States.
The affected products, BAC-5051E routers, are used in building automation
systems. According to KMC Controls, BAC-5051E routers are used in Commercial
Facilities. KMC Controls estimates that these products are used in the
Americas, the Middle East, and Southeast Asia.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
CROSS-SITE REQUEST FORGERY [a]
An unauthorized user can use a CSRF attack to read configuration data from a
file.
CVE-2016-4494 [b] has been assigned to this vulnerability. A CVSS v3 base
score of 5.3 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N). [c]
MISSING AUTHENTICATION FOR CRITICAL FUNCTION [d]
A missing authorization check allows an unauthorized user to read
configuration data from a file.
CVE-2016-4495 [e] has been assigned to this vulnerability. A CVSS v3 base
score of 5.3 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N). [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
KMC Controls has released firmware Version E0.2.0.2 for the BAC-5051E router
to add additional security for web-based access to the routers configuration
pages. KMC Controls recommends that all BAC-5051E routers be upgraded to this
version. Users can obtain the latest version of the firmware in the KMC
Controls partner portal (requires a login).
https://partners.kmccontrols.com/user/login
According to KMC Controls, the BAC-5051E router is not intended to be a public
facing Internet device. For best security, install the router behind a
firewall inside a sites intranet network. KMC Controls has also sent a copy of
its technical bulletin to users. A copy of this bulletin can be found on KMC
Controls web site in the service bulletin section.
ICS-CERT recommends, as quality assurance, that users test the update in a
test development environment that reflects their production environment prior
to installation. In addition, 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-352: Cross-Site Request Forgery (CSRF),
http://cwe.mitre.org/data/definitions/352.html, web site last accessed June
07, 2016.
b. NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4494,
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 June 07, 2016.
d. CWE-306: Missing Authentication for Critical Function,
http://cwe.mitre.org/data/definitions/306.html, web site last accessed June
07, 2016.
e. NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4495,
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:N/UI:N/S...,
web site last accessed June 07, 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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