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AUSCERT External Security Bulletin Redistribution
ESB-2022.1717
Advisory (icsa-22-104-02) Johnson Controls Metasys
20 April 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Johnson Controls Metasys
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2021-36205
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-22-104-02
Comment: CVSS (Max): 8.1 CVE-2021-36205 (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
CVSS Source: ICS-CERT
Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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ICS Advisory (ICSA-22-104-02)
Johnson Controls Metasys
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 8.1
o ATTENTION: Exploitable remotely
o Vendor: Johnson Controls Inc.
o Equipment: Metasys ADS/ADX/OAS Servers
o Vulnerability: Incomplete Cleanup
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow a remote attacker to
use a session token that has not been cleared upon log out of an authenticated
user.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Johnson Controls reports this vulnerability affects the following Metasys ADS/
ADX/OAS servers for building management systems:
o All Metasys ADS/ADX/OAS Servers: Versions 10 and 11
3.2 VULNERABILITY OVERVIEW
3.2.1 INCOMPLETE CLEANUP CWE-459
Under certain circumstances the session token is not cleared upon log out.
CVE-2021-36205 has been assigned to this vulnerability. A CVSS v3 base score of
8.1 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:N/S:U/
C:H/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
Johnson Controls, Inc. reported this vulnerability to CISA.
4. MITIGATIONS
Johnson Controls recommends users update the following:
o Update all Metasys ADS/ADX/OAS Servers: Versions 10 with patch 10.1.5
o Update all Metasys ADS/ADX/OAS Servers: Versions 11 with patch 11.0.2
For more detailed mitigation instructions, please see Johnson Controls Product
Security Advisory JCI-PSA-2022-06 v1
Johnson Controls recommends taking steps to minimize risks to all building
automation systems.
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 this vulnerability. This
vulnerability has a high attack complexity.
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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