This updated advisory is a follow-up to the advisory update titled ICSA-16-208-01B Siemens SIMATIC WinCC, PCS 7, and WinCC Runtime Professional Vulnerabilities that was published October 4, 2016, on the NCCIC/ICS-CERT web site.
Siemens has identified two vulnerabilities in SIMATIC WinCC, PCS 7, and WinCC Runtime Professional. Sergey Temnikov and Vladimir Dashchenko from Kaspersky Lab reported these issues directly to Siemens. Siemens has produced updates to mitigate these vulnerabilities.
These vulnerabilities could be exploited remotely.
Siemens reports that the vulnerabilities affect the following products:
V7.1 SP4: all versions prior toV7.1 SP4 with WinCC V7.0 SP2 Update 12,
V8.0: All versions prior to V8.0 SP2 with WinCC V7.2 Update 13,
V8.1: All versions prior to 8.1 SP1 with WinCC V7.3 Update 10, and
V8.2: All versions prior to 8.2 with WinCC V7.4 Update 1
Attackers exploiting these vulnerabilities could possibly extract arbitrary files or remotely execute arbitrary code.
Impact to individual organizations depends on many factors that are unique to each organization. ICS-CERT recommends that organizations evaluate the impact of these vulnerabilities based on their operational environment, architecture, and product implementation.
Siemens is a multinational company headquartered in Munich, Germany.
The affected products are: SIMATIC WinCC, a supervisory control and data acquisition (SCADA) system; and SIMATIC PCS7, a distributed control system (DCS) integrating SIMATIC WinCC. These products are deployed across several sectors including Chemical, Energy, Food and Agriculture, and Water and Wastewater Systems. Siemens estimates that these products are used worldwide.
Specially crafted packets sent to SIMATIC WinCC or WinCC Runtime Professional could allow remote code execution for unauthenticated users.
CVE-2016-5743b has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).c
Specially crafted packets sent to SIMATIC WinCC could allow unauthenticated users to extract arbitrary files from the WinCC station. This vulnerability only affects WinCC V7.0 and WinCC V7.2.
CVE-2016-5744e has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).f
These vulnerabilities could be exploited remotely.
No known public exploits specifically target these vulnerabilities.
An attacker with low skill would be able to exploit these vulnerabilities.
Siemens has produced updates for the following products and strongly encourages users to upgrade to the new versions as soon as possible:
<https://support.industry.siemens.com/cs/ww/en/view/109741519>
<https://support.industry.siemens.com/cs/ww/en/view/109741127>
<https://support.industry.siemens.com/cs/ww/en/view/109739416>
<https://support.industry.siemens.com/cs/ww/en/view/109738470>
<https://support.industry.siemens.com/cs/ww/de/view/109738653>
<https://support.industry.siemens.com/cs/ww/en/view/109741519>
<https://support.industry.siemens.com/cs/ww/en/view/109738681>
<https://support.industry.siemens.com/cs/ww/en/view/109738681>
<https://support.industry.siemens.com/cs/ww/en/view/109738681>
<https://support.industry.siemens.com/cs/ww/en/view/109738681>
<https://support.industry.siemens.com/cs/ww/en/view/109739416>
<https://support.industry.siemens.com/cs/ww/en/view/109738680>
<https://support.industry.siemens.com/cs/ww/en/view/109738680>
<https://support.industry.siemens.com/cs/ww/en/view/109738680>
<https://support.industry.siemens.com/cs/ww/en/view/109738470>
<https://support.industry.siemens.com/cs/ww/en/view/109738678>
<https://support.industry.siemens.com/cs/ww/en/view/109738678>
<https://support.industry.siemens.com/cs/ww/en/view/109738678>
Until updates can be applied, Siemens recommends the following steps to mitigate the risk:
For more information on these vulnerabilities and more detailed mitigation instructions, please see Siemens Security Advisory SSA-378531 at the following location:
<http://www.siemens.com/cert/en/cert-security-advisories.htm>
As a general security measure Siemens strongly recommends protecting network access to the WinCC and PCS 7 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>
ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:
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.
Contact Information
For any questions related to this report, please contact the CISA at:
Email: [email protected]
Toll Free: 1-888-282-0870
For industrial control systems cybersecurity information: https://us-cert.cisa.gov/ics
or incident reporting: https://us-cert.cisa.gov/report
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