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AUSCERT External Security Bulletin Redistribution
ESB-2017.2811
Advisory (ICSA-17-306-01) Siemens SIMATIC PCS 7 Improper Input Validation
3 November 2017
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AusCERT Security Bulletin Summary
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Product: Siemens SIMATIC PCS 7
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Denial of Service -- Unknown/Unspecified
Resolution: Patch/Upgrade
CVE Names: CVE-2017-14023
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-17-306-01
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Advisory (ICSA-17-306-01)
Siemens SIMATIC PCS 7
Original release date: November 02, 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 4.9
ATTENTION: Remotely exploitable/low skill level to exploit.
Vendor: Siemens
Equipment: SIMATIC PCS 7
Vulnerability: Improper Input Validation
AFFECTED PRODUCTS
The following versions of SIMATIC PCS 7, a distributed control system, are
affected:
- -V8.1 prior to V8.1 SP1 with WinCC V7.3 Upd 13, and
- -V8.2 all versions.
IMPACT
Successful exploitation of this vulnerability could allow a remote
authenticated attacker to crash services on the devices.
MITIGATION
Siemens has released the following updates:
V8.1: Update to V8.1 SP1 with WinCC V7.3 Upd 13 which can be obtained from:
https://support.industry.siemens.com/cs/ww/en/view/109746452 (link is
external)
Siemens is currently working on updates for the remaining affected versions
and recommends that affected users:
- -Apply cell protection concept,
- -Use VPN for protecting network communication between cells, and
- -Apply Defense-in-Depth.
Siemens also strongly recommends that users protect network access to the
SIMATIC PCS 7 with appropriate mechanisms by configuring the environment
according to operation guidelines that can be found at:
https://support.industry.siemens.com/cs/ww/en/view/60119725 (link is
external).
For more information on this vulnerability and more detailed mitigation
instructions, please see Siemens Security Advisory SSA-523365 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
IMPROPER INPUT VALIDATION CWE-20
The improper input validation vulnerability has been identified, which may
allow an authenticated remote attacker who is a member of the administrators
group to crash services by sending specially crafted messages to the DCOM
interface.
CVE-2017-14023 has been assigned to this vulnerability. A CVSS v3 base score
of 4.9 has been assigned; the CVSS vector string is
(AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).
RESEARCHER
Sergey Temnikov and Vladimir Dashchenko of Kaspersky Labs reported the
vulnerability to Siemens.
BACKGROUND
Critical Infrastructure Sectors: Chemical, Energy, Food and Agriculture, and
Water and Wastewater Systems
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany
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