16 January 2020
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.0160 Advisory (icsa-20-014-05) Siemens TIA Portal 16 January 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens TIA Portal Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Administrator Compromise -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2019-10934 Original Bulletin: https://www.us-cert.gov/ics/advisories/icsa-20-014-05 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-20-014-05) Siemens TIA Portal Original release date: January 14, 2020 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/ . 1. EXECUTIVE SUMMARY o CVSS v3 7.8 o ATTENTION: Low skill level to exploit o Vendor: Siemens o Equipment: TIA Portal o Vulnerability: Path Traversal 2. RISK EVALUATION Successful exploitation of this vulnerability could allow a local attacker to execute arbitrary code with SYSTEM privileges. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of TIA Portal, the Totally Integrated Automation Portal, are affected: o TIA Portal v14: All versions o TIA Portal v15: All versions prior to v15.1 Upd 4 o TIA Portal v16: All versions 3.2 VULNERABILITY OVERVIEW 3.2.1 IMPROPER LIMITATION OF A PATHNAME TO A RESTRICTED DIRECTORY ('PATH TRAVERSAL') CWE-22 Changing the contents of a configuration file could allow an attacker to execute arbitrary code with SYSTEM privileges. This vulnerability could be exploited by an attacker with a valid account and limited access rights on the system. No user interaction is required. CVE-2019-10934 has been assigned to this vulnerability. A CVSS v3 base score of 7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:N/S:U/ C:H/I:H/A:H ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Energy, Food and Agriculture, Water and Wastewater Systems o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Germany 3.4 RESEARCHER \William Knowles from Applied Risk reported this vulnerability to Siemens. 4. MITIGATIONS Siemens recommends installing the following software update to address this vulnerability: o TIA Portal V15: Update to v15.1 Upd 4 Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk: o Remove write permissions for every non-administrative user on files and folders located below the "TraceEngine" folder (usually located at "C:\ ProgramData\Siemens\Automation"). As a general security measure, Siemens strongly recommends users protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends users configure the environment according to Siemens' operational guidelines for Industrial Security , and follow the recommendations in the product manuals. Additional information on industrial security by Siemens can be found at: https://www.siemens.com/industrialsecurity For more information on this vulnerability and more detailed mitigation instructions, please see Siemens security advisory SSA-629512 CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. CISA also provides a section for control systems security recommended practices on the ICS webpage on us-cert.gov . 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 on the ICS webpage on us-cert.gov in the Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies . Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents. No known public exploits specifically target this vulnerability. This vulnerability is not exploitable remotely. - --------------------------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 email@example.com 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: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: firstname.lastname@example.org 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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBXh+yDGaOgq3Tt24GAQhlKA//QCk+poMmH+FqaCENY3VlgK0GpARJTPQ4 AzuCowfdCkmUaqhsK7aczV8IF33GJU5iOjFt+RfAP4EO+bMOiMHtHawi2NY5m2dM vTl+fW7ZYAc4ANL55qHhpFiO1D7WGC0rlewYF2hgtbqupcNYXAYIXXvZHfhSpiRR Qm/MVz7mYEdYgzlngoYDcWd2xSqntCCNEMgl4sysR+CBnd5OCeaZnhf+VkQkp9VD Z/t+BUbvDIdhXGPYIrvkLEk+0x/H5RsL1mg8uHS700+5/VDqJSzDlXYS0WyrFA+E bR28oCQrizR10/4ViswMLdkBSbtaA+kOmLnTIqzbk1l4yP3vCogL/0MOQUkL/dUl AfmQ4m/LwGhX52Pr/rdUrKhMiRg04l2H0tUTpXIgXUx33nkaew7WLMQsLCEDk0Lt m4mpChAqxnuUIHOUTeKKfHUoY/IcRPz88fsfBP1uTkcHVUSRPsir3nhrb7YeveKA N+sD8V4AkrQIB+R3o7c+jUOxxS9RsQYquz1aj80dzcZXGm3q4p83xLFqgQPMNj9+ ZoDqoougOpKIxzeOjJd1fQii3LcZ5ZF1wF3XB5rnhnl0wdMZ7/e2VCV5+3UYM87y PUyoqrvf4D1AYUCjRRF7jGYueEt4kAum9OSogQ0TdOv0u24cvSUZGLBiUHwh4TP1 zidyw52lh6g= =RDAU -----END PGP SIGNATURE-----