Siemens TIA Portal (Update A)

# ICS Advisory (ICSA-20-014-05) ## Siemens TIA Portal (Update A) Original release date: April 14, 2020 [Print Document](javascript:window.print\(\);) [Tweet](https://twitter.com/share?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-20-014-05) [Like Me](https://www.facebook.com/sharer.php?u=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-20-014-05) [Share](http://www.addthis.com/bookmark.php?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-20-014-05) ### Legal Notice All information products included in [https://us-cert.gov/ics](/ics) 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 [https://www.us- cert.gov/tlp/](/tlp/). * * * ## 1\. EXECUTIVE SUMMARY * **CVSS v3 7.8** * **ATTENTION:** Low skill level to exploit * **Vendor:** Siemens * **Equipment:** TIA Portal * **Vulnerability:** Path Traversal ## 2\. UPDATE INFORMATION This updated advisory is a follow-up to the original advisory titled ICSA-20-014-05 Siemens TIA Portal that was published January 14, 2020, to the ICS webpage on us-cert.gov. ## 3\. RISK EVALUATION Successful exploitation of this vulnerability could allow a local attacker to execute arbitrary code with SYSTEM privileges. ## 4\. TECHNICAL DETAILS ### 4.1 AFFECTED PRODUCTS The following versions of TIA Portal, the Totally Integrated Automation Portal, are affected: * TIA Portal v14: All versions * TIA Portal v15: All versions prior to v15.1 Upd 4 **\--------- Begin Update A Part 1 of 2 ---------** * TIA Portal v16: All versions prior to v16 Upd 1 **\--------- End Update A Part 1 of 2 ---------** ### 4.2 VULNERABILITY OVERVIEW #### 4.2.1 [IMPROPER LIMITATION OF A PATHNAME TO A RESTRICTED DIRECTORY ('PATH TRAVERSAL') CWE-22](https://cwe.mitre.org/data/definitions/22.html) 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](http://web.nvd.nist.gov/view/vuln/detail?vulnId=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](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)). ### 4.3 BACKGROUND * **CRITICAL INFRASTRUCTURE SECTORS:** Chemical, Critical Manufacturing, Energy, Food and Agriculture, Water and Wastewater Systems * **COUNTRIES/AREAS DEPLOYED:** Worldwide * **COMPANY HEADQUARTERS LOCATION:** Germany ### 4.4 RESEARCHER \William Knowles from Applied Risk reported this vulnerability to Siemens. ## 5\. MITIGATIONS **\--------- Begin Update A Part 2 of 2 ---------** Siemens has released updates for TIA Portal v15 and v16 and is working on updates for TIA Portal v14. Siemens recommends specific countermeasures as there are currently no fixes available for the latter. Siemens recommends installing the following software update to address this vulnerability: * TIA Portal v15: [Update to v15.1 Upd 4](https://support.industry.siemens.com/cs/us/en/view/109763890) * TIA Portal v16: [Update to v16 Upd 1](https://support.industry.siemens.com/cs/ww/en/view/109775861/) or later version **\--------- End Update A Part 2 of 2 ---------** Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk: * 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](https://cert-portal.siemens.com/operational-guidelines-industrial- security.pdf), 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](http://www.siemens.com/cert/advisories) 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](https://www.us-cert.gov/ics/recommended-practices) on the ICS webpage on [us-cert.gov](https://www.us-cert.gov/ics). Several recommended practices are available for reading and download, including [Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies](https://www.us- cert.gov/sites/default/files/recommended_practices/NCCIC_ICS- CERT_Defense_in_Depth_2016_S508C.pdf). Additional mitigation guidance and recommended practices are publicly available on the [ICS webpage on us-cert.gov](https://www.us-cert.gov/ics) in the Technical Information Paper, [ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies](https://www.us-cert.gov/ics/tips/ICS- TIP-12-146-01B). 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.