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AUSCERT External Security Bulletin Redistribution
ESB-2015.1676
Siemens Climatix BACnet/IP Communication Module Cross-site
Scripting Vulnerability
29 June 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Climatix BACnet/IP communication module
Publisher: US-CERT
Operating System: Network Appliance
Impact/Access: Cross-site Scripting -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2015-4174
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-15-176-01
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Advisory (ICSA-15-176-01)
Siemens Climatix BACnet/IP Communication Module Cross-site Scripting
Vulnerability
Original release date: June 25, 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
Siemens has identified a cross-site scripting (XSS) vulnerability in its
Climatix BACnet/IP communication module. This vulnerability was reported
directly to Siemens by Juan Francisco Bolivar Hernandez. Siemens has produced
a new firmware update to mitigate this vulnerability. This vulnerability could
be exploited remotely.
AFFECTED PRODUCTS
Siemens reports that the vulnerability affects the following products:
Climatix BACnet/IP communication module: All versions prior to V10.34.
IMPACT
An attacker using this vulnerability to exploit a system may be able to affect
the integrity of the data 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 this vulnerability based on their operational environment,
architecture, and product implementation.
BACKGROUND
Siemens is a multinational company headquartered in Munich, Germany.
BACnet/IP communication modules help to integrate controller types POL6XX of
the Climatix family into BACnet networks. According to Siemens, these devices
are deployed across several sectors including Commercial Facilities. Siemens
estimates that these products are used primarily in the United States and
Europe with a small percentage in Asia.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
CROSS-SITE SCRIPTING[a]
The integrated web server (Port 80/TCP) of the affected devices could allow
cross-site scripting attacks if unsuspecting users are tricked into accessing
a malicious link.
CVE-2015-4174[b] has been assigned to this vulnerability. A CVSS v2 base score
of 4.3 has been assigned; the CVSS vector string is
(AV:N/AC:M/Au:N/C:N/I:P/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 medium skill would be able to exploit this vulnerability.
MITIGATION
Siemens provides firmware update Climatix BACnet/IP communication module
V10.34 to fix the vulnerability. This firmware update can be obtained by
registered users at the following location:
https://support.industry.siemens.com/cs/ww/en/view/86192510
The new firmware update includes further security improvements (e.g., web
server authentication enabled by default), and Siemens strongly recommends
that all users update to this new release. For further information please see
the release notes of firmware version V10.34.
As a general security measure, Siemens strongly recommends to protect network
access to the Climatix BACnet/IP communication module with appropriate
mechanisms.
For more information on this vulnerability and more detailed mitigation
instructions, please see Siemens Security Advisory SSA-142512 at the following
location:
http://www.siemens.com/cert/advisories
ICS-CERT recommends that users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. Specifically, users could:
Use an application firewall that can detect XSS attacks. It can be helpful
when the code cannot be fixed, as an emergency prevention measure, or to
provide defense in depth.
Block outside access to Port 80/TCP at the firewall. Use an intrusion
detection system (IDS) or an intrusion prevention system (IPS) to monitor
access to this port.
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 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
(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-79: Improper Neutralization of Input During Web Page Generation
('Cross-site Scripting'), http://cwe.mitre.org/data/definitions/79.html, web
site last accessed June 25, 2015.
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-4174, 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:M/Au:N/C:N/I:P/A:N, web
site last accessed June 25, 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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