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AUSCERT External Security Bulletin Redistribution
ESB-2017.1182
Siemens SIMATIC WinCC and SIMATIC WinCC Runtime Professional
10 May 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens SIMATIC WinCC
Publisher: ICS-CERT
Operating System: Windows
Network Appliance
Impact/Access: Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2017-6867
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-17-129-03
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Advisory (ICSA-17-129-03)
Siemens SIMATIC WinCC and SIMATIC WinCC Runtime Professional
Original release date: May 09, 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 WinCC and SIMATIC WinCC Runtime Professional
Vulnerability: Denial of Service
AFFECTED PRODUCTS
Siemens reports that the vulnerability affects the following versions of
SIMATIC WinCC, SIMATIC WinCC (TIA Portal), and SIMATIC WinCC Runtime
Professional:
SIMATIC WinCC:
V7.3: All versions prior to V7.3 Update 11, and
V7.4: All versions prior to V7.4 SP1.
SIMATIC WinCC Runtime Professional:
V13: All versions prior to V13 SP2, and
V14: All versions prior to V14 SP1.
SIMATIC WinCC (TIA Portal) Professional:
V13: All versions prior to V13 SP2, and
V14: All versions prior to V14 SP1.
IMPACT
Successful exploitation of this vulnerability under certain circumstances may
allow the attacker to cause the affected service to crash, resulting in a
denial-of-service condition.
MITIGATION
Siemens has released updates for the following products and strongly
encourages users to upgrade to the new versions as soon as possible:
SIMATIC WinCC:
V7.3: Update to WinCC V7.3 Update 13
https://support.industry.siemens.com/cs/ww/en/view/109746452 (link is
external)
V7.4: Update to WinCC V7.4 SP1
https://support.industry.siemens.com/cs/ww/en/view/109746038 (link is
external)
SIMATIC WinCC Runtime Professional:
V13: Update to V13 SP2
https://support.industry.siemens.com/cs/ww/en/view/109746268 (link is
external)
V14: Update to V14 SP1
https://support.industry.siemens.com/cs/ww/en/view/109746276 (link is
external)
SIMATIC WinCC (TIA Portal) Professional:
V13: Update to V13 SP2
https://support.industry.siemens.com/cs/ww/en/view/109746075 (link is
external)
V14: Update to V14 SP1
https://support.industry.siemens.com/cs/ww/en/view/109746074 (link is
external)
For more information on this vulnerability and more detailed mitigation
instructions, please see Siemens Security Advisory SSA-156872 at the following
location:
http://www.siemens.com/cert/en/cert-security-advisories.htm (link is external)
As a general security measure Siemens strongly recommends protecting network
access to SIMATIC WinCC, SIMATIC WinCC Runtime, and SIMATIC WinCC (TIA Portal)
Professional stations 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)
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 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.
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
An authenticated, remote attacker who is a member of the administrators group
could crash services by sending specially crafted messages to the DCOM
interface.
CVE-2017-6867 has been assigned to this vulnerability. A CVSS v3 base score of
4.9 has been calculated; 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 the Kaspersky Lab Critical
Infrastructure Defense Team reported this vulnerability directly to Siemens.
BACKGROUND
Critical Infrastructure Sectors: Food and Agriculture, Chemical, Energy, Water
and Wastewater Systems
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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