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             AUSCERT External Security Bulletin Redistribution

         Advisory (ICSA-18-058-01): Siemens SIMATIC Industrial PCs
                               21 March 2018


        AusCERT Security Bulletin Summary

Product:           Siemens SIMATIC Industrial PCs
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Access Privileged Data -- Remote/Unauthenticated
Resolution:        Mitigation
CVE Names:         CVE-2017-15361  

Reference:         ESB-2017.2607

Original Bulletin: 

Revision History:  March    21 2018: ICS CERT has added patches for SIMATIC 
                                     IPC547G all versions prior to R1.21.0
                   February 28 2018: Initial Release

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Advisory (ICSA-18-058-01)
Siemens SIMATIC Industrial PCs
Original release date: February 27, 2018

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CVSS v3 5.9

ATTENTION: Remotely exploitable

Vendor: Siemens

Equipment: SIMATIC Industrial PCs

Vulnerability: Cryptographic Issues


Siemens reports that the vulnerability affects the following versions of
SIMATIC Industrial PCs using a version of Infineon's Trusted Platform
Module (TPM):

SIMATIC Field-PG M5 all versions prior to v22.01.04,
SIMATIC IPC227E all versions prior to v20.01.10,
SIMATIC IPC277E all versions prior to v20.01.10,
SIMATIC IPC427E all versions prior to v21.01.07,
SIMATIC IPC477E all versions prior to v21.01.07,
SIMATIC IPC547G all versions prior to R1.21.0, and
SIMATIC ITP1000 all versions prior to v23.01.03


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:

(link is external)

Additional information on Industrial Security by Siemens can be found at:

(link is external)

Siemens provides firmware updates to address the vulnerability for the
following affected products, and recommends users update to the newest

SIMATIC Field-PG M5: Update to v22.01.04

https://support.industry.siemens.com/cs/ww/de/view/109738122 (link is external)

SIMATIC IPC227E: Update to v20.01.10

https://support.industry.siemens.com/cs/ww/de/view/109481715 (link is external)

SIMATIC IPC277E: Update to v20.01.10

https://support.industry.siemens.com/cs/ww/de/view/109481715 (link is external)

SIMATIC IPC427E: Update to v21.01.07

https://support.industry.siemens.com/cs/ww/de/view/109742593 (link is external)

SIMATIC IPC477E: Update to v21.01.07

https://support.industry.siemens.com/cs/ww/de/view/109742593 (link is external)

SIMATIC IPC547G: Update BIOS to R1.21.0

https://support.industry.siemens.com/cs/ww/de/view/109750349 (link is external)

SIMATIC ITP1000: Update to v23.01.03

https://support.industry.siemens.com/cs/ww/de/view/109748173 (link is external)

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 (link is external)

NCCIC recommends 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.

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


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

Contact Information

For any questions related to this report, please contact the NCCIC at:

Email: NCCICCUSTOMERSERVICE@hq.dhs.gov (link sends e-mail)
Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information:
or incident reporting:  https://ics-cert.us-cert.gov/Report-Incident?

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