Siemens Industrial Products (Update A) (CVE-2020-0543)

# ICS Advisory (ICSA-20-252-07) ## Siemens Industrial Products (Update A) Original release date: October 13, 2020 | Last revised: October 16, 2020 [Print Document](javascript:window.print\(\);) [Tweet](https://twitter.com/share?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-20-252-07) [Like Me](https://www.facebook.com/sharer.php?u=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-20-252-07) [Share](http://www.addthis.com/bookmark.php?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-20-252-07) ### 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 5.5** * **ATTENTION:** Low skill level to exploit * **Vendor:** Siemens * **Equipment:** Siemens Industrial Products containing certain processors * **Vulnerability:** Exposure of Sensitive Information to an Unauthorized Actor ## 2\. UPDATE INFORMATION This updated advisory is a follow-up to the original advisory titled ICSA-20-252-07 Siemens Industrial Products that was published September 8, 2020, to the ICS webpage on us-cert.gov. ## 3\. RISK EVALUATION Successful exploitation of this vulnerability may allow an authenticated user to enable information disclosure via local access. ## 4\. TECHNICAL DETAILS ### 4.1 AFFECTED PRODUCTS * SIMATIC Field PG M4: All versions. * SIMATIC Field PG M5: All versions * SIMATIC Field PG M6: All versions * SIMATIC IPC3000 SMART: All versions * SIMATIC IPC347E: All versions * SIMATIC IPC427D (incl. SIPLUS variants): All versions * SIMATIC IPC427E (incl. SIPLUS variants): All versions * SIMATIC IPC477D: All versions * SIMATIC IPC477E: All versions * SIMATIC IPC477E Pro: All versions * SIMATIC IPC527G: All versions * SIMATIC IPC547E: All versions * SIMATIC IPC547G: All versions * SIMATIC IPC627D: All versions * SIMATIC IPC627E: All versions * SIMATIC IPC647D: All versions * SIMATIC IPC647E: All versions * SIMATIC IPC677D: All versions * SIMATIC IPC677E: All versions * SIMATIC IPC827D: All versions * SIMATIC IPC847D: All versions * SIMATIC IPC847E: All versions * SIMATIC ITP1000: All versions * SIMOTION P320-4E: All versions * SIMOTION P320-4S: All versions **\--------- Begin Update A Part 1 of 2 ---------** * SIMATIC IPC627E: All BIOS versions prior to v25.02.06 * SIMATIC IPC647E: All BIOS versions prior to v25.02.06 * SIMATIC IPC677E: All BIOS versions prior to v25.02.06 * SIMATIC IPC847E: All BIOS versions prior to v25.02.06 * SINUMERIK 828D (PPU.4 / PPU1740): All versions (Versions removed from the scope of this advisory) * SINUMERIK 840D sl (NCU730.3B): All versions (Versions removed from the scope of this advisory) * SINUMERIK ONE (NCU1750 / NCU1760): All versions (Versions removed from the scope of this advisory) **\--------- End Update A Part 1 of 2 ---------** ### 4.2 VULNERABILITY OVERVIEW #### 4.2.1 [EXPOSURE OF SENSITIVE INFORMATION TO AN UNAUTHORIZED ACTOR CWE-200](https://cwe.mitre.org/data/definitions/200.html) Incomplete cleanup from specific special register read operations in some Intel processors may allow an authenticated user to potentially enable information disclosure via local access. [CVE-2020-0543](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-0543) has been assigned to this vulnerability. A CVSS v3 base score of 5.5 has been calculated; the CVSS vector string is ([AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C)). ### 4.3 BACKGROUND * **CRITICAL INFRASTRUCTURE SECTORS:** Critical manufacturing * **COUNTRIES/AREAS DEPLOYED:** Worldwide * **COMPANY HEADQUARTERS LOCATION:** Germany ### 4.4 RESEARCHER Alyssa Milburn, Hany Ragab, Kaveh Razavi, Herbert Bos, and Cristiano Giuffrida from the VUSec group at VU Amsterdam reported this vulnerability to Intel. ## 5\. MITIGATIONS **\--------- Begin Update A Part 2 of 2 ---------** Siemens recommends updating the following products to the most current BIOS version where available: * SIMATIC IPC627E IPC647E, IPC677E, and IPC847E BIOS to [v25.02.06](https://support.industry.siemens.com/cs/ww/en/view/109763408) **\--------- End Update A Part 2 of 2 ---------** Siemens is preparing further updates and recommends the following specific workarounds and mitigations users can apply to reduce the risk until fixes are available. * As a prerequisite for an attack, an attacker must be able to run untrusted code on affected systems. Siemens recommends limiting the possibilities to run untrusted code if possible. * Applying a defense-in-depth concept can help to reduce the probability that untrusted code is run on the system. Siemens recommends applying the [defense-in-depth concept](https://www.siemens.com/industrialsecurity). As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends configuring the environment according to [Siemens' operational guidelines for Industrial Security](https://www.siemens.com/cert/operational-guidelines-industrial- security), and following 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 these vulnerabilities and the associated mitigations, please see Siemens security advisory [SSA-534763](https://new.siemens.com/global/en/products/services/cert.html#SecurityPublications) CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. 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 from adjacent networks.