5.9 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
4.3 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:N/A:N
0.004 Low
EPSS
Percentile
72.0%
**ATTENTION:**Exploitable remotely
Vendor: Siemens
**Equipment:**SIMATIC Industrial PCs
**Vulnerability:**Cryptographic Issues
This updated advisory is a follow-up to the original advisory titled ICSA-18-058-01 Siemens SIMATIC Industrial PCs that was published February 27, 2018, on the NCCIC/ICS-CERT website.
Siemens reports that the vulnerability affects the following versions of SIMATIC Industrial PCs using a version of Infineon’s Trusted Platform Module (TPM):
--------- Begin Update A Part 1 of 2 --------
--------- End Update A Part 1 of 2 ----------
Successful exploitation of this vulnerability could make it easier for attackers to conduct cryptographic attacks against the key material.
As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to run the devices in a protected IT environment, Siemens particularly recommends to configure the environment according to Siemens’ Operational Guidelines for Industrial Security and to follow the recommendations in the product manuals. The Operational Guidelines for Industrial Security can be found at:
<https://www.siemens.com/cert/operational-guidelines-industrial-security>
Additional information on Industrial Security by Siemens can be found at:
Siemens provides firmware updates to address the vulnerability for the following affected products, and recommends users update to the newest version:
<https://support.industry.siemens.com/cs/ww/de/view/109738122>
<https://support.industry.siemens.com/cs/ww/de/view/109481715>
<https://support.industry.siemens.com/cs/ww/de/view/109481715>
<https://support.industry.siemens.com/cs/ww/de/view/109742593>
https://support.industry.siemens.com/cs/ww/de/view/109742593
--------- Begin Update A Part 2 of 2 ----------
https://support.industry.siemens.com/cs/ww/de/view/109750349
--------- End Update A Part 2 of 2 ----------
<https://support.industry.siemens.com/cs/ww/de/view/109748173>
For more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-470231 at the following location:
<http://www.siemens.com/cert/en/cert-security-advisories.htm>
NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
NCCIC 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 NCCIC Technical Information Paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT website.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents.
No known public exploits specifically target this vulnerability. High skill level is needed to exploit.
The Infineon RSA library in Infineon Trusted Platform Module (TPM) firmware creates RSA keys that might be susceptible to the ROCA attack, possibly exposing the private key of a RSA key pair.
CVE-2017-15361 has been assigned to this vulnerability. A CVSS v3 base score of 5.9 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).
Siemens reported this vulnerability to NCCIC.
**Critical Infrastructure Sectors:**Chemical, Critical Manufacturing, Energy, Food and Agriculture, Water and Wastewater Systems
**Countries/Areas Deployed:**Worldwide
**Company Headquarters Location:**Germany
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-15361
www.siemens.com/cert/en/cert-security-advisories.htm
cwe.mitre.org/data/definitions/310.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.industry.siemens.com/cs/ww/de/view/109481715
support.industry.siemens.com/cs/ww/de/view/109481715
support.industry.siemens.com/cs/ww/de/view/109738122
support.industry.siemens.com/cs/ww/de/view/109742593
support.industry.siemens.com/cs/ww/de/view/109742593
support.industry.siemens.com/cs/ww/de/view/109748173
support.industry.siemens.com/cs/ww/de/view/109750349
twitter.com/CISAgov
twitter.com/intent/tweet?text=Siemens%20SIMATIC%20Industrial%20PCs%20%28Update%20A%29+https://www.cisa.gov/news-events/ics-advisories/icsa-18-058-01a
www.dhs.gov
www.dhs.gov/foia
www.dhs.gov/performance-financial-reports
www.facebook.com/CISA
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www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
www.instagram.com/cisagov
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www.linkedin.com/sharing/share-offsite/?url=https://www.cisa.gov/news-events/ics-advisories/icsa-18-058-01a
www.oig.dhs.gov/
www.siemens.com/cert/operational-guidelines-industrial-security
www.siemens.com/global/en/home/company/topic-areas/future-of-manufacturing/industrial-security.html
www.surveymonkey.com/r/CISA-cyber-survey?product=https://www.cisa.gov/news-events/ics-advisories/icsa-18-058-01a
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=Siemens%20SIMATIC%20Industrial%20PCs%20%28Update%20A%29&body=www.cisa.gov/news-events/ics-advisories/icsa-18-058-01a
5.9 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
4.3 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:N/A:N
0.004 Low
EPSS
Percentile
72.0%