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AUSCERT External Security Bulletin Redistribution
ESB-2021.3204
Advisory (icsa-21-266-01) Trane Symbio
24 September 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Trane Symbio
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Console/Physical
Reduced Security -- Console/Physical
Resolution: Patch/Upgrade
CVE Names: CVE-2021-38448
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-266-01
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ICS Advisory (ICSA-21-266-01)
Trane Symbio
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 7.5
o ATTENTION: Low attack complexity
o Vendor: Trane
o Equipment: Symbio 700 and Symbio 800 controllers
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 Symbio 700 (incl. Odyssey Split Systems): All versions prior to v1.00.0023
o Symbio 800 (incl. IntelliPak Rooftop Air Conditioner, Chiller Models:
CenTraVac Simplex, CentraVac Duplex, ACR, RTAF, CMAF, HDWA.RTWF, CGWF,
CXWF, CCUF, and GVAF): All versions prior to v1.00.0007
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-2021-38448 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is ( AV:P/AC:L/PR:N/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.
Trane has identified the following specific mitigations:
o Symbio 700 controllers: Upgrade to v1.00.0023 or later
o Symbio 800 controllers: Upgrade to v1.00.0007 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 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. 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
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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