Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2022.5802 Advisory (icsa-22-314-04) Siemens SINUMERIK ONE and SINUMERIK MC 11 November 2022 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens SINUMERIK ONE Siemens SINUMERIK MC Publisher: ICS-CERT Operating System: Network Appliance Resolution: Mitigation CVE Names: CVE-2022-38465 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-22-314-04 Comment: CVSS (Max): 9.3 CVE-2022-38465 (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:C/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:N/UI:N/S:C/C:H/I:H/A:H - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-22-314-04) Siemens SINUMERIK ONE and SINUMERIK MC Original release date: November 10, 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 9.3 o ATTENTION: Low attack complexity o Vendor: Siemens o Equipment: SINUMERIK ONE and SINUMERIK MC o Vulnerability: Insufficiently Protected Credentials 2. RISK EVALUATION Successful exploitation of this vulnerability could allow attackers to discover the private key of a given CPU product family via an offline attack against a single CPU from the family. Attackers could then use this knowledge to extract confidential configuration data from projects. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of SINUMERIK CNC systems are affected: o SINUMERIK ONE All Versions o SINUMERIK MC All Versions 3.2 VULNERABILITY OVERVIEW 3.2.1 INSUFFICIENTLY PROTECTED CREDENTIALS CWE-522 All versions of Siemens SINUMERIK ONE and SINUMERIK MC use an insecure method to store authentication credentials, which are therefore susceptible to being retrieved. CVE-2022-38465 has been assigned to this vulnerability. A CVSS v3 base score of 9.3 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:N/S:C/ 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 Siemens reported this vulnerability to CISA. 4. MITIGATIONS Siemens identified the following specific workarounds and mitigations that customers can apply to reduce the risk: o Expose the communication between the S7-1500 CPU and the HMI of the affected products only to trusted network environments. o Protect access to the TIA Portal project and SINUMERIK NCU (including related memory cards) from unauthorized actors. As a general security measure, Siemens 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 and following the recommendations in the product manuals. For more information, see Siemens security advisory SSA-568428 in HTML or CSAF. CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability these vulnerabilities. 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 business networks. 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 at cisa.gov/ics . Several CISA products detailing cyber defense best 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 at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies . Organizations observing suspected malicious activity should follow established internal procedures and report 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/ iQIVAwUBY23HiMkNZI30y1K9AQjy1Q//dLJvTtMjZnriBxPewXjWM1lHdBoIjTew 1YigHj+a2EIgVlHit/Ho6jhjN/cjDant+bye35KLreO6G7LKbJNzfIcgsm7bO0eR kBMQSVNiwV6ExjboQEmAjhz3Bzcz+XnPV0P5xiC1l+uv10W1uwrMfQuddoxdC19X jdz77Mdl0aU5ZZsc/oJbci/ZVig91WaAkHsUclAGnj++ZCC/n43TXGk/28ZMfxWM JwhZZnqjLYl6N9sTrHsXaliqvW1vNfqGQDiI/vj8e9Esj0DcQMe4vVLCn/d9PpOG yjUj1KPIDnsJYSNDqJ1Aaf2LsLazndTygolf+D5iGxbvszkR5Fp0SVeOFzp9aL0g V6VRMqCb5C/tYjpnoejuNNVSbZWA9MgzxpD4fSHOn2hPwc9VccFZc7y1Ib0ZmLJ5 38L72BwGQPsQN3AFBkGBwS8lh60ZRsxy4ezbk6Oh0hm+kr65MDyZrSySqTkiXrfV fxPuHIa2I9m+EzT++TZrKfCMkIwwe6lar1gQO58zxj5rdZhxWI0gtH6y5epryxpn pHv8muq3t9KlzW9fXqrofmS6IEAlh+KA+po2o5a8ZDwByvOUMY5ewtJDTvQERYuy 5DtWqtSvytxyQeNPJszGN+ssPpgqnfsqiNZedHTEcBOps+kTrFA151T/y9noOCcF WTiqzi+Ccx8= =nSLd -----END PGP SIGNATURE-----