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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.1755 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 Publisher: US-CERT Operating System: Android Impact/Access: Access Privileged Data -- Remote/Unauthenticated Provide Misleading Information -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2017-6871 CVE-2017-6870 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-17-194-03 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-17-194-03) Siemens SIMATIC Sm@rtClient Android App Original release date: July 13, 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 7.4 ATTENTION: Remotely exploitable/low skill level to exploit. Vendor: Siemens Equipment: SIMATIC Sm@rtClient Android App Vulnerabilities: Man-in-the-Middle, Authentication Bypass Using an Alternate Path or Channel AFFECTED PRODUCTS Siemens reports that the vulnerabilities affect the following SIMATIC Sm@rtClient Android apps for remote operation and monitoring of SIMATIC HMI systems: SIMATIC WinCC Sm@rtClient for Android: All versions prior to V1.0.2.2 SIMATIC WinCC Sm@rtClient Lite for Android: All versions prior to V1.0.2.2 IMPACT 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. MITIGATION Siemens has released SIMATIC WinCC Sm@rtClient V1.0.2.2 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 guidelines. For more information on these vulnerabilities and more detailed mitigation instructions, please see Siemens Security Advisory SSA-589378 at the following location: 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 email scams. Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks. No known public exploits specifically target these vulnerabilities. VULNERABILITY OVERVIEW 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 (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N). 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 (AV:P/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N). RESEARCHER Karsten Sohr and Timo Glander from the TZI at the University of Bremen reported these vulnerabilities to Siemens. BACKGROUND Critical Infrastructure Sector: Chemical, Energy, Food and Agriculture, and 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 contin - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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