Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2022.1711 Advisory (icsa-22-104-08) Siemens SCALANCE W1700 20 April 2022 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens SCALANCE W1700 Publisher: ICS-CERT Operating System: Network Appliance Resolution: Patch/Upgrade CVE Names: CVE-2022-28329 CVE-2022-28328 CVE-2022-27481 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-22-104-08 Comment: CVSS (Max): 7.4 CVE-2022-27481 (CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H) CVSS Source: ICS-CERT Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-22-104-08) Siemens SCALANCE W1700 Original release date: April 14, 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 7.4 o ATTENTION: Exploitable remotely/low attack complexity o Vendor: Siemens o Equipment: SCALANCE W1700 o Vulnerabilities: Race Condition, Improper Input Validation 2. RISK EVALUATION Successful exploitation of these vulnerabilities could allow an attacker to cause various denial-of-service conditions. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of SCALANCE, a wireless communication device, are affected: o SCLANCE W1788-1 M12: All versions prior to 3.0.0 o SCALANCE W1788-2 ECC M12: All versions prior to 3.0.0 o SCALANCE W1788-2 M12: All versions prior to 3.0.0 o SCALANCE W1788-2IA M12: All versions prior to 3.0.0 3.2 VULNERABILITY OVERVIEW 3.2.1 CONCURRENT EXECUTION USING SHARED RESOURCE WITH IMPROPER SYNCHRONIZATION ('RACE CONDITION') CWE-362 The affected product does not properly handle resources of ARP requests. This could allow an attacker to cause a race condition that leads to a crash of the entire device. CVE-2022-27481 has been assigned to this vulnerability. A CVSS v3 base score of 7.4 has been assigned; the CVSS vector string is ( AV:A/AC:L/PR:N/UI:N/S:C/C:N/ I:N/A:H) . 3.2.2 IMPROPER INPUT VALIDATION CWE-20 The affected product does not properly handle malformed Multicast LLC frames. This could allow an attacker to trigger a denial-of-service condition. CVE-2022-28328 has been assigned to this vulnerability. A CVSS v3 base score of 7.4 has been assigned; the CVSS vector string is ( AV:A/AC:L/PR:N/UI:N/S:C/C:N/ I:N/A:H ). 3.2.3 IMPROPER INPUT VALIDATION CWE-20 The affected product does not properly handle malformed TCP packets received over the RemoteCapture feature. This could allow an attacker to lead to a denial-of-service condition, which only affects the port used by the RemoteCapture feature. CVE-2022-28329 has been assigned to this vulnerability. A CVSS v3 base score of 4.3 has been assigned; the CVSS vector string is ( AV:A/AC:L/PR:N/UI:N/S:U/C:N/ I:N/A:L ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Multiple Sectors o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Germany 3.4 RESEARCHER Siemens reported these vulnerabilities to CISA. 4. MITIGATIONS Siemens recommends installing the following software updates to address these vulnerabilities. o Update SCALANCE W1788-1 M12 to Version 3.0.0 or later o Update SCALANCE W1788-2 EEC M12 to Version 3.0.0 or later o Update SCALANCE W1788-2 M12 to Version 3.0.0 or later o Update SCALANCE W1788-2IA M12 to Version 3.0.0 or later 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. Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity For additional information, please refer to Siemens Security Advisory SSA-392912 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 these vulnerabilities. For any questions related to this report, please contact the CISA at: Email: CISAservicedesk@cisa.dhs.gov Toll Free: 1-888-282-0870 CISA continuously strives to improve its products and services. You can help by choosing one of the links below to provide feedback about this product. - --------------------------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: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBYl+ZH+NLKJtyKPYoAQjrMxAAg8yIeU/0gxsjVsbdKontLtRAhuZ1ypid xdZ9m2T3ZjAHN8WIpAlGe1oeVjnuR9paHZJbE3n4i+1ncW/Xf+QF1BXDMcnMCOPr uE/vjNmGn9dMPBFRdofUCu8Z7JE1jlYsjTfBGgLo6K797AkXdJf2yzv2QuM6ADIP TRwENSiljo+vTW8NM5Z3kUyqO4mbsQvDPB29JlGG3UjQB2Ovnkmw0pNUfHnuCQqC AxNfJpo2mx30Kanp3tyM2TLLw3Kg/u3R3WXvYErXtYAjoXmCoyJjuR7lvNOBTIh4 X+IjjzdPDIX3vuAKApmQddaVPnr+4rwuWavbnTCkpMS5rb/322hUyij2UElIYy7Q UcvirzSje488c0BZkvX9LDb/QRl40rciUUhbsDLS1Da+ZHuih69R5IGdjPsVMok+ k9uxBC7fuN+zvSKGFRkeWscWRmybiR0MxvaGgPV9Q8H4doQkM2GR6HKiuTZVSBdg r7XXT9jGhELisAY3KhuYggDZZPhrcgA0R/1AUuiGQwMeSqDAPzx8pgsGQSVvN2K5 ShLU8ZYkN2m2bc4D5m0asDd0/Q6M3cdnNmd4pgnUyBMkJd43rYRKyv85BR4ZP/e+ IFz40aDvXqaytG8BV8dZ1/qAR0aEixmzXbEAatx11s58z4tGRvNNcnQBoU68q1qN 0K+hN0cTlLM= =D5ep -----END PGP SIGNATURE-----