Johnson Controls Metasys

# ICS Advisory (ICSA-19-227-01) ## Johnson Controls Metasys Original release date: August 15, 2019 [Print Document](javascript:window.print\(\);) [Tweet](https://twitter.com/share?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-19-227-01) [Like Me](https://www.facebook.com/sharer.php?u=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-19-227-01) [Share](http://www.addthis.com/bookmark.php?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-19-227-01) ### Legal Notice All information products included in [https://us-cert.gov/ics](/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://www.us- cert.gov/tlp/](/tlp/). * * * ## 1\. EXECUTIVE SUMMARY * **CVSS v3 6.8** * **ATTENTION:** Exploitable remotely * **Vendor:** Johnson Controls * **Equipment:** Metasys * **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: * Metasys system versions prior to 9.0 ### 3.2 VULNERABILITY OVERVIEW #### 3.2.1 [REUSING A NONCE, KEY PAIR IN ENCRYPTION CWE-323](https://cwe.mitre.org/data/definitions/323.html) 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](http://web.nvd.nist.gov/view/vuln/detail?vulnId=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](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/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](https://cwe.mitre.org/data/definitions/321.html) 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](http://web.nvd.nist.gov/view/vuln/detail?vulnId=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](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N)). ### 3.3 BACKGROUND * **CRITICAL INFRASTRUCTURE SECTORS:** Critical Manufacturing * **COUNTRIES/AREAS DEPLOYED:** Worldwide * **COMPANY HEADQUARTERS LOCATION:** Ireland ### 3.4 RESEARCHER harpocrates.ghost@protonmail.com reported these vulnerabilities to Johnson Controls. ## 4\. MITIGATIONS Johnson Controls recommends the following: * Users should upgrade to Version 9.0 or later and configure sites with trusted certificates. * Further ICS security notices and product security guidance are located at the [Johnson Controls product security website](https://www.johnsoncontrols.com/cyber-solutions/security-advisories). For questions concerning this product, contact [Johnson Controls Global Product Security](https://www.johnsoncontrols.com/cyber-solutions); email: [productsecurity@jci.com](mailto:productsecurity@jci.com). CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: * Minimize network exposure for all control system devices and/or systems, and ensure that they are [not accessible from the Internet](https://www.us-cert.gov/ics/alerts/ICS-ALERT-10-301-01). * Locate control system networks and remote devices behind firewalls, and isolate them from the business network. * 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](https://www.us-cert.gov/ics/recommended-practices) on the ICS webpage on [us-cert.gov](https://www.us-cert.gov/ics). Several recommended practices are available for reading and download, including [Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies](https://www.us- cert.gov/sites/default/files/recommended_practices/NCCIC_ICS- CERT_Defense_in_Depth_2016_S508C.pdf). Additional mitigation guidance and recommended practices are publicly available on the [ICS webpage on us-cert.gov](https://www.us-cert.gov/ics) in the Technical Information Paper, [ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies](https://www.us-cert.gov/ics/tips/ICS- TIP-12-146-01B). 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.