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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2022.6569 Advisory (icsa-22-349-07) Siemens Simcenter STAR-CCM+ 16 December 2022 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens Simcenter STAR-CCM+ Publisher: ICS-CERT Operating System: Network Appliance Resolution: Mitigation CVE Names: CVE-2022-43517 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-22-349-07 Comment: CVSS (Max): 7.8 CVE-2022-43517 (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) CVSS Source: ICS-CERT Calculator: 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 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-22-349-07) Siemens Simcenter STAR-CCM+ Original release date: December 15, 2022 Legal Notice All information products included in https://us-cert.cisa.gov/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://us-cert.cisa.gov/tlp/ . 1. EXECUTIVE SUMMARY o CVSS v3 7.8 o ATTENTION: Low attack complexity o Vendor: Siemens o Equipment: Simcenter STAR-CCM+ o Vulnerability: Incorrect Permission Assignment for Critical Resource 2. RISK EVALUATION Successful exploitation of this vulnerability could allow a local attacker with an unprivileged account to override or modify the service executable and subsequently gain elevated privileges. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of Siemens Simcenter STAR-CCM+, a computational fluid dynamics software, are affected: o All versions 3.2 VULNERABILITY OVERVIEW 3.2.1 INCORRECT PERMISSION ASSIGNMENT FOR CRITICAL RESOURCE CWE-732 The affected application improperly assigns file permissions to installation folders. This could allow a local attacker with an unprivileged account to override or modify the service executables and subsequently gain elevated privileges. CVE-2022-43517 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: Critical Manufacturing o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Germany 3.4 RESEARCHER Craig Carr, from University of Glasgow, reported this vulnerability to Siemens. 4. MITIGATIONS Siemens has identified the following specific workarounds and mitigations users can apply to reduce risk: o Remove write permissions for non-administrative users on files and folders located under the installation path. As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. To operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens' operational guidelines for industrial security and to follow the recommendations in the product manuals. For more information, see Siemens security advisory SSA-930100 in HTML or CSAF . CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: o Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the Internet . o Locate control system networks and remote devices behind firewalls and isolate them from the business network. o When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as its connected devices. 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 cisa.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 cisa.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. For any questions related to this report, please contact the CISA at: Email: CISAservicedesk@cisa.dhs.gov Toll Free: 1-888-282-0870 - --------------------------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: https://www.auscert.org.au/bulletins/ =========================================================================== 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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: https://auscert.org.au/gpg-key/ iQIVAwUBY5vEa8kNZI30y1K9AQgNCg/+PXOPwLdRO6h9csC+zFsG7NGz+rsCokna f2HQNg9McBoS9Bs9lFYzGgxMcf1ChEw3Z5zw1edD2AFBuwt46LvMgN+23qdxLJ2X zpSWcYA09Q66nBJ8Qmu1Nkj18L1uPDI0fqTRyTuQsOhlwsuzHbA0Oc65QB5beE3q 5D1GHwt2zHoFj3Y8UmzzdLr5irMpDrIiXw1Y8+bf9JyfNHWp+cT3nIopC6hcujgo blFA6FU+y6ZazCvhIL5POjlVj2pVuhWXFNxklF+Qr5Tpk3ngR6FPcdvOjc/U89iZ Sp9dCKDr+91MJ52aLZOxzQcBc1mhNZQtXWmCS0cVPLpZ9ezOuLLALrArKrFzRMXP bl9ulzIND9Zi2hNuUrp9Rbp7PQiGElFz2VmdDBDW6mUoh5RLeJbYQDooqdefDNvu CnVgvXyPoN/7WaL6NxfBirBMjXkzccpKTOO6aOQ8O72n5SOkG5yJxirqkOgeVAUT W1bhqBzUODIBLXQEsWGtMSTD5Wo57KdinC5kboj04sRg/e2uZ+8snoeD8HabH7em Aj+I8bewyX7cVtckqFo1WREbVv0ZJlWtowaEhQDqUmPROQOlfsO/KeRVxmI0VsyT AfhAliVnFl9zbqrOmpMUsLfqlm5JEwOjivYy8tM2w1YFgXqy5XXNSHj3JcLPGfvg DZqhYvIE4ZM= =HEKw -----END PGP SIGNATURE-----