Siemens SIMATIC, SINAMICS (Update A)

# ICS Advisory (ICSA-20-161-05) ## Siemens SIMATIC, SINAMICS (Update A) Original release date: July 14, 2020 [Print Document](javascript:window.print\(\);) [Tweet](https://twitter.com/share?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-20-161-05) [Like Me](https://www.facebook.com/sharer.php?u=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-20-161-05) [Share](http://www.addthis.com/bookmark.php?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-20-161-05) ### 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:** SIMATIC, SINAMICS * **Vulnerabilities:** Uncontrolled Search Path Element, Heap-based Buffer Overflow ## 2\. UPDATE INFORMATION This updated advisory is a follow-up to the original advisory titled ICSA-20-161-05 Siemens SIMATIC, SINAMICS that was published June 9, 2020, on the ICS webpage on us-cert.gov. ## 3\. RISK EVALUATION Successful exploitation of these vulnerabilities could allow an attacker to affect the availability of the devices under certain conditions. ## 4\. TECHNICAL DETAILS ### 4.1 AFFECTED PRODUCTS The following Siemens products are affected: **\--------- Begin Update A Part 1 of 2 ---------** * SIMATIC PCS 7 v8.2 and prior: All versions * SIMATIC PCS 7 v9.0: All versions prior to 9.0 SP3 **\--------- End Update A Part 1 of 2 ---------** * SIMATIC PDM: All versions * SIMATIC STEP 7 v5.X: All versions prior to 5.6 SP2 HF3 * SINAMICS STARTER (containing STEP 7 OEM version): All versions prior to 5.4 HF1 ### 4.2 VULNERABILITY OVERVIEW #### 4.2.1 [UNCONTROLLED SEARCH PATH ELEMENT CWE-427](https://cwe.mitre.org/data/definitions/427.html) The affected product is vulnerable to DLL hijacking, which may allow an attacker with local access to execute code with elevated privileges. [CVE-2020-7585](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-7585) 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)). #### 4.2.2 [HEAP-BASED BUFFER OVERFLOW CWE-122](https://cwe.mitre.org/data/definitions/122.html) The affected product is vulnerable to a stack-based buffer overflow, which may allow an attacker with local access to cause a denial-of-service condition. [CVE-2020-7586](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-7586) 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, Energy, Food and Agriculture, Water and Wastewater Systems * **COUNTRIES/AREAS DEPLOYED:** Worldwide * **COMPANY HEADQUARTERS LOCATION:** Germany ### 4.4 RESEARCHER Uri Katz of Claroty reported these vulnerabilities to Siemens. ## 5\. MITIGATIONS Siemens recommends applying updates, where available: * SIMATIC STEP 7 v5.X: Update to [v5.6 SP2 HF3](https://support.industry.siemens.com/cs/de/en/view/109779992) or later * SINAMICS STARTER (containing STEP 7 OEM version): Update to [v5.4 HF1](https://support.industry.siemens.com/cs/de/en/view/26233208) or later **\--------- Begin Update A Part 2 of 2 ---------** * SIMATIC PCS 7 v9.0: Update to v9.0 SP3 (Software can be obtained by contacting local support) **\--------- End Update A Part 2 of 2 ---------** Siemens recommends the following to reduce the risk: * Restrict access to project files on the engineering station to trusted users. * Only use project files from trusted sources. 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 the [Siemens operational guidelines for Industrial Security](https://cert-portal.siemens.com/operational-guidelines-industrial- security.pdf) and following the recommendations in the product manuals. For additional information, please refer to Siemens Security Advisory [SSA-689942](https://cert-portal.siemens.com/productcert/pdf/ssa-689942.pdf) CISA recommends 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](https://www.us-cert.gov/sites/default/files/publications/emailscams_0905.pdf) for more information on avoiding email scams. * Refer to [Avoiding Social Engineering and Phishing Attacks](https://www.us-cert.gov/ncas/tips/ST04-014) for more information on social engineering attacks. 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 these vulnerabilities. These vulnerabilities are not exploitable remotely.