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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.2908 Advisory (icsa-21-238-01) Johnson Controls Controlled Electronic Management Systems CEM Systems AC2000 27 August 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Johnson Controls CEM Systems AC2000 Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Unauthorised Access -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-27663 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-21-238-01 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-21-238-01) Johnson Controls Controlled Electronic Management Systems CEM Systems AC2000 Original release date: August 26, 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 8.2 o ATTENTION: Exploitable remotely/low attack complexity o Vendor: Controlled Electronic Management Systems Ltd., a subsidiary of Johnson Controls Inc o Equipment: CEM Systems AC2000 o Vulnerability: Improper Authorization 2. RISK EVALUATION Under specific conditions, successful exploitation of this vulnerability could allow a remote attacker access to the system without adequate authorization. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS Johnson Controls reports this vulnerability affects the following versions of CEM Systems AC2000: o Versions 10.1 through 10.5 This vulnerability applies only to users who have implemented Single Sign On (SSO) and have installed the AC2000 Application Programming Interface (API). 3.2 VULNERABILITY OVERVIEW 3.2.1 IMPROPER AUTHORIZATION CWE-285 Under certain conditions, the application does not perform an adequate authorization check for functionality that requires a provable user identity. CVE-2021-27663 has been assigned to this vulnerability. A CVSS v3 base score of 8.2 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/ C:H/I:L/A:N ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities, 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 steps to minimize risks to applying a patch to all affected versions and implementations. The fix will also be included in Version 10.5 Server Feature Pack 2, Version 10.6, and all future releases. To access the patch, affected users should contact a CEM support team . For more detailed mitigation instructions, please see Johnson Controls Product Security Advisory JCI-PSA-2021-15 v1 Aligning with CISA recommendations, 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 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 that VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize that VPN is only as secure as the 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. 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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). 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