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AUSCERT External Security Bulletin Redistribution
ESB-2017.2586
Advisory (ICSA-17-285-05) Siemens BACnet Field Panels
13 October 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens BACnet Field Panels
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-9947 CVE-2017-9946
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-17-285-05
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Advisory (ICSA-17-285-05)
Siemens BACnet Field Panels
Original release date: October 12, 2017
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/.
CVSS v3 7.5
ATTENTION: Remotely exploitable/low skill level to exploit.
Vendor: Siemens
Equipment: BACnet Field Panels
Vulnerabilities: Authentication Bypass Using an Alternate Path or Channel,
Path Traversal
AFFECTED PRODUCTS
Siemens reports that the vulnerabilities affect the following BACnet field
panels:
APOGEE PXC BACnet Automation Controllers: All versions prior to V3.5
TALON TC BACnet Automation Controllers: All versions prior to V3.5
IMPACT
Successful exploitation of these vulnerabilities could allow unauthenticated
attackers with access to the integrated webserver to download sensitive
information.
MITIGATION
Siemens has provided firmware Version V3.5 for BACnet Field Panels Advanced
modules, which fixes the vulnerabilities, and they recommend that users update
to the new fixed version. Users should contact the local service organization
for further information on how to obtain and apply V3.5. The web form is
available at the following location on the Siemens web site:
http://w3.usa.siemens.com/buildingtechnologies/us/en/contact-us/Pages/bt-contact-form.aspx
(link is external)
For more information on this vulnerability and more detailed mitigation
instructions, please see Siemens Security Advisory SSA-148078 at the following
location:
http://www.siemens.com/cert/en/cert-security-advisories.htm (link is external)
NCCIC/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.
No known public exploits specifically target these vulnerabilities.
VULNERABILITY OVERVIEW
AUTHENTICATION BYPASS USING AN ALTERNATE PATH OR CHANNEL CWE-288
An attacker with network access to the integrated web server (Ports 80/TCP and
443/TCP) could bypass the authentication and download sensitive information
from the device.
CVE-2017-9946 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).
IMPROPER LIMITATION OF A PATHNAME TO A RESTRICTED DIRECTORY ('PATH TRAVERSAL')
CWE-22
A directory traversal vulnerability could allow a remote attacker with network
access to the integrated web server (Ports 80/TCP and 443/TCP) to obtain
information on the structure of the file system of the affected devices.
CVE-2017-9947 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).
RESEARCHER
Siemens reported these vulnerabilities to ICS-CERT.
BACKGROUND
Critical Infrastructure Sector: Commercial facilities
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany
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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Australian Computer Emergency Response Team
The University of Queensland
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Internet Email: auscert@auscert.org.au
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