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AUSCERT External Security Bulletin Redistribution
ESB-2017.2518
Advisory (ICSA-17-278-02) Siemens 7KT PAC1200 Data Manager
Authentication Bypass
6 October 2017
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AusCERT Security Bulletin Summary
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Product: Siemens 7KT PAC1200 Data Manager
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Administrator Compromise -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-9944
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-17-278-02
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Advisory (ICSA-17-278-02)
Siemens 7KT PAC1200 Data Manager
Original release date: October 05, 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 9.8
ATTENTION: Remotely exploitable/low skill level to exploit.
Vendor: Siemens
Equipment: 7KT PAC1200 data manager
Vulnerability: Authentication Bypass Using an Alternate Path or Channel
AFFECTED PRODUCTS
Siemens reports that the vulnerability affects the following versions of the
7KT PAC1200 data manager (7KT1260) from the SENTRON portfolio:
7KT PAC1200 data manager: All versions prior to V2.03
IMPACT
Successful exploitation of this vulnerability could allow an attacker to
bypass authentication mechanisms and perform administrative functions.
MITIGATION
Siemens provides firmware Version V2.03 for 7KT PAC1200 data manager (7KT1260)
from the SENTRON portfolio, which fixes the vulnerability and recommends users
update to the new fixed version. The firmware update V2.0.3 for 7KT PAC1200
data manager (7KT1260) from the SENTRON portfolio can be found on the Siemens
web site at the following location:
https://support.industry.siemens.com/cs/ww/de/view/109749883/en?dl=en (link is
external)
As a general security measure, Siemens strongly recommends protecting network
access to the devices with appropriate mechanisms. Siemens advises configuring
the environment according to Siemens operational guidelines in order to run
the devices in a protected IT environment.
https://www.siemens.com/cert/operational-guidelines-industrial-security (link
is external)
For more information on this vulnerability and more detailed mitigation
instructions, please see Siemens Security Advisory SSA-971654 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 this vulnerability. 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 this vulnerability.
VULNERABILITY OVERVIEW
AUTHENTICATION BYPASS USING AN ALTERNATE PATH OR CHANNEL CWE-288
The integrated web server (Port 80/TCP) of the affected devices could allow an
unauthenticated remote attacker to perform administrative operations over the
network.
CVE-2017-9944 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
RESEARCHER
Maxim Rupp reported this vulnerability directly to Siemens.
BACKGROUND
Critical Infrastructure Sectors: Energy
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany
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