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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-21-266-02) Trane Tracer
24 September 2021
AusCERT Security Bulletin Summary
Product: Trane Tracer
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
CVE Names: CVE-2021-38450
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ICS Advisory (ICSA-21-266-02)
Original release date: September 23, 2021
All information products included in https://us-cert.cisa.gov/ics are provided
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(DHS) does not provide any warranties of any kind regarding any information
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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/
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Ireland
Trane reported this vulnerability to CISA.
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
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
o Use secure remote access solutions, such as Trane Connect Remote Access,
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
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:
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.
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