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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.3205 Advisory (icsa-21-266-02) Trane Tracer 24 September 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Trane Tracer Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-38450 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-21-266-02 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-21-266-02) Trane Tracer Original release date: September 23, 2021 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 9.9 o ATTENTION: Exploitable remotely/low attack complexity o Vendor: Trane o Equipment: Tracer SC, Tracer SC+, and Tracer Concierge o Vulnerability: Code Injection 2. RISK EVALUATION Successful exploitation of this vulnerability could allow an authenticated user to execute arbitrary code on the controller. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of Trane building automation products: o Tracer SC: All versions prior to v4.4 SP7 o Tracer SC+: All versions prior to v5.3 SP3 o Tracer Concierge: All versions prior to v5.3 SP3 3.2 VULNERABILITY OVERVIEW 3.2.1 IMPROPER CONTROL OF GENERATION OF CODE ('CODE INJECTION') CWE-94 The affected controllers do not properly sanitize the input containing code syntax. As a result, an attacker could craft code to alter the intended controller flow of the software. CVE-2021-38450 has been assigned to this vulnerability. A CVSS v3 base score of 9.9 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:C/ C:L/I:H/A:H ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Ireland 3.4 RESEARCHER Trane reported this vulnerability to CISA. 4. MITIGATIONS Affected users should contact a Trane representative to install updated firmware or request additional information. Please reference Trane service database number HUB-205962 when contacting the Trane office. Tracer SC is no longer actively developed, tested, or sold. Tracer SC will be considered end-of-life on December 31, 2022. Trane recommends identifying a migration plan for replacing the Tracer SC controller with the next-generation Tracer SC+ controller. Tracer SC+ can function as a drop-in replacement for Tracer SC, providing significant updates to security capabilities. Trane has identified the following specific mitigations: o Tracer SC: Upgrade to v4.4 SP7 or later o Tracer SC+: Upgrade to v5.5 SP3 or later o Tracer Concierge: Upgrade to v5.5 SP3 or later In addition to the specific recommendations above, Trane continues to recommend the following best practices as an additional protection against this and other controller vulnerabilities: o Restrict physical controller access to trained and trusted personnel. o Isolate Tracer controls from other network devices using virtual local area networks (VLAN), and from the Internet using a firewall with no exposed inbound ports. o Use secure remote access solutions, such as Trane Connect Remote Access, when needed. o Ensure user credentials are not shared and follow best practices for appropriate complexity (e.g., strong passwords). o Have a well-documented process and owner to ensure regular software/ firmware updates and keep systems up to date. 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 that 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 us-cert.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 us-cert.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. 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. 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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 iQIVAwUBYU0Da+NLKJtyKPYoAQjdiBAAjuNzhnaWdEMKmgsmSg9w5cjaQF2fbyTX asqjIwD1BL9zW8Gm5ZV3lVIH/A0yCiqgrCTVFrTBGGV0whwTC/r2VgkXj4LPt+qd Kk4fn2I5xerIy+IVrQBrrK7hz5puvOJjl7uRfXxTyu8spZYWIO0HPizwCJNnhQcg AMimdCudy55njDL/4K4XkuuX4d79cVVhVvun1BMuUsJKA20eMXCTdqR/ysnu8btX JdmDMzBBuJCptMiDkNAbbfcZC0qf8/25o6DX7vlMzAXVZuvQ+uxMMBwXILuuPFZ0 oeIooYuUEFF8YSR7mLWDCx426uDYzOtF52aFe7uPoHKXrDYWCadWzrBB2k8gwGKl oFuFz4I2W2V2qBJFSZf0cc0AbFIe1YBiGvjho/KsObjTbBkYCnwrs59zH0xX2wUj lPOYeQoB26H0vfaqGuOPZpyVbEfS3hoShpBE5lYVTUOLqWh/QmZ3iWTo1HhpjGYX g6aWzRsPLEKAy5C+QXdW4T9ho0L5JbkOBmBPvl4KEKEDaBlWJ+SisJqZ23+yTvZc 4xI0rfdv3fAeKd7tagshCjbKPHJ6n4sdFZ6SCZJrj1gkCponp1VSA3kUNsFyvSVq nWwwxI+0R83coo+nMqCCaIuQtBK9FexUNgjgJh1bfREIoA1lgPkiZL7Rl7Hg1lgX 9QODVpyY7+Q= =l4by -----END PGP SIGNATURE-----