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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.3147 ICS-CERT Advisory (icsa-19-227-01) Johnson Controls Metasys 16 August 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Johnson Controls Metasys Publisher: US-CERT Operating System: Windows Impact/Access: Access Privileged Data -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2019-7594 CVE-2019-7593 Original Bulletin: https://www.us-cert.gov/ics/advisories/icsa-19-227-01 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-19-227-01) Johnson Controls Metasys Original release date: August 15, 2019 Legal Notice All information products included in http://ics-cert.us-cert.gov 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 http://www.us-cert.gov/tlp/ . 1. EXECUTIVE SUMMARY o CVSS v3 6.8 o ATTENTION: Exploitable remotely o Vendor: Johnson Controls o Equipment: Metasys o Vulnerabilities: Reusing a Nonce, Key Pair in Encryption; Use of Hard-coded Cryptographic Key 2. RISK EVALUATION Successful exploitation of these vulnerabilities could be leveraged by an attacker to decrypt captured network traffic. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of Metasys building automation system are affected: o Metasys system versions prior to 9.0 3.2 VULNERABILITY OVERVIEW 3.2.1 REUSING A NONCE, KEY PAIR IN ENCRYPTION CWE-323 Metasys ADS/ADX servers and NAE/NIE/NCE engines make use of a shared RSA key pair for certain encryption operations involving the Site Management Portal (SMP). An attacker with access to the shared RSA key pair could decrypt captured network traffic between the Metasys ADS/ADX servers or NAE/NIE/NCE engines and the connecting SMP user client. CVE-2019-7593 has been assigned to this vulnerability. A CVSS v3 base score of 6.8 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:R/S:U/ C:H/I:H/A:N ). 3.2.2 USE OF HARD-CODED CRYPTOGRAPHIC KEY CWE-321 Metasys ADS/ADX servers and NAE/NIE/NCE engines make use of a hardcoded RC2 key for certain encryption operations involving the Site Management Portal (SMP). An attacker with access to the hardcoded RC2 key could decrypt captured network traffic between the Metasys ADS/ADX servers or NAE/NIE/NCE engines and the connecting SMP user client. CVE-2019-7594 has been assigned to this vulnerability. A CVSS v3 base score of 6.8 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:R/S:U/ C:H/I:H/A:N ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Ireland 3.4 RESEARCHER harpocrates.ghost@protonmail.com reported these vulnerabilities to Johnson Controls. 4. MITIGATIONS Johnson Controls recommends the following: o Users should upgrade to Version 9.0 or later and configure sites with trusted certificates. o Further ICS security notices and product security guidance are located at the Johnson Controls product security website . For questions concerning this product, contact Johnson Controls Global Product Security ; email: productsecurity@jci.com . 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.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.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 these vulnerabilities. High skill level is needed to exploit. - --------------------------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. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. 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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