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AUSCERT External Security Bulletin Redistribution
Advisory (ICSA-17-194-03) Siemens SIMATIC Sm@rtClient Android Ap
14 July 2017
AusCERT Security Bulletin Summary
Product: Siemens SIMATIC Sm@rtClient Android App
Operating System: Android
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
CVE Names: CVE-2017-6871 CVE-2017-6870
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Siemens SIMATIC Sm@rtClient Android App
Original release date: July 13, 2017
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more information about TLP, see http://www.us-cert.gov/tlp/.
CVSS v3 7.4
ATTENTION: Remotely exploitable/low skill level to exploit.
Equipment: SIMATIC Sm@rtClient Android App
Vulnerabilities: Man-in-the-Middle, Authentication Bypass Using an Alternate
Path or Channel
Siemens reports that the vulnerabilities affect the following SIMATIC
Sm@rtClient Android apps for remote operation and monitoring of SIMATIC HMI
SIMATIC WinCC Sm@rtClient for Android: All versions prior to V220.127.116.11
SIMATIC WinCC Sm@rtClient Lite for Android: All versions prior to V18.104.22.168
Successful exploitation of these vulnerabilities could allow an attacker in a
privileged network position to read and modify data within a Transport Layer
Security TLS session.
Siemens has released SIMATIC WinCC Sm@rtClient V22.214.171.124 for Android to address
these vulnerabilities and recommends updating as soon as possible. Updates
will be installed automatically if the mobile device is configured
accordingly. If the update does not install automatically, users can find the
latest version at the Google Play Store:
https://play.google.com/store/search?q=Sm@rtClient (link is external)
It is advised to configure the environment according to operational
For more information on these vulnerabilities and more detailed mitigation
instructions, please see Siemens Security Advisory SSA-589378 at the following
http://www.siemens.com/cert/advisories (link is external)
NCCIC/ICS-CERT recommends that users take defensive measures to minimize the
risk of exploitation of these vulnerabilities. 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.
In addition, ICS-CERT recommends that users take the following measures to
protect themselves from social engineering attacks:
Do not click web links or open unsolicited attachments in email messages.
Refer to Recognizing and Avoiding Email Scams for more information on avoiding
Refer to Avoiding Social Engineering and Phishing Attacks for more information
on social engineering attacks.
No known public exploits specifically target these vulnerabilities.
CHANNEL ACCESSIBLE BY NON-ENDPOINT ('MAN-IN-THE-MIDDLE') CWE-300
The existing TLS protocol implementation could allow an attacker to read and
modify data within a TLS session while performing a man-in-the-middle attack.
This vulnerability affects only SIMATIC WinCC Sm@rtClient for Android.
CVE-2017-6870 has been assigned to this vulnerability. A CVSS v3 base score of
7.4 has been calculated; the CVSS vector string is
AUTHENTICATION BYPASS USING AN ALTERNATE PATH OR CHANNEL CWE-288
An attacker with physical access to an unlocked mobile device that has the
affected app running could bypass the app's authentication mechanism under
certain conditions. SIMATIC WinCC Sm@rtClient Lite for Android is only
affected by this vulnerability.
CVE-2017-6871 has been assigned to this vulnerability. A CVSS v3 base score of
4.6 has been calculated; the CVSS vector string is
Karsten Sohr and Timo Glander from the TZI at the University of Bremen
reported these vulnerabilities to Siemens.
Critical Infrastructure Sector: Chemical, Energy, Food and Agriculture, and
Water and Wastewater Systems
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany
For any questions related to this report, please contact ICS-CERT at:
Email: email@example.com (link sends e-mail)
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900
For industrial control systems security information and incident reporting:
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