17 August 2022
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2022.4078 Advisory (icsa-22-228-06) Emerson Proficy Machine Edition 17 August 2022 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Emerson Proficy Machine Edition Publisher: ICS-CERT Operating System: Network Appliance Resolution: Mitigation CVE Names: CVE-2022-2793 CVE-2022-2792 CVE-2022-2791 CVE-2022-2790 CVE-2022-2789 CVE-2022-2788 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-22-228-06 Comment: CVSS (Max): 5.9 CVE-2022-2793 (CVSS:3.0/AV:P/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H) CVSS Source: ICS-CERT Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:P/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-22-228-06) Emerson Proficy Machine Edition Original release date: August 16, 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 9.3 o ATTENTION: Exploitable remotely/Low attack complexity o Vendor: Emerson o Equipment: Proficy Machine Edition o Vulnerabilities: Missing Support for Integrity Check, Improper Access Control, Unrestricted Upload of File with Dangerous Type, Improper Verification of Cryptographic Signature, Insufficient Verification of Data Authenticity, Path Traversal: '\..\filename' 2. RISK EVALUATION Successful exploitation of these vulnerabilities could allow for remote hidden code execution on the connected programmable logic controller (PLC) and for malicious files to be uploaded from the PLC to connected workstations. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of Proficy Machine Edition, an engineering workstation that is part of the PACSystems control system software platform, are affected: o Proficy Machine Edition Version 9.80 and prior 3.2 VULNERABILITY OVERVIEW 3.2.1 MISSING SUPPORT FOR INTEGRITY CHECK CWE-353 Proficy Machine Edition Version 9.00 and prior has no authentication or authorization of data packets after establishing a connection for the SRTP protocol. CVE-2022-2793 has been assigned to this vulnerability. A CVSS v3 base score of 5.9 has been assigned; the CVSS vector string is ( AV:P/AC:L/PR:N/UI:R/S:U/C:N/ I:H/A:H ). 3.2.2 IMPROPER ACCESS CONTROL CWE-284 Proficy Machine Edition Version 9.00 and prior stores project data in a directory with improper access control lists. CVE-2022-2792 has been assigned to this vulnerability. A CVSS v3 base score of 6.6 has been assigned; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:R/S:U/C:N/ I:H/A:H ). 3.2.3 UNRESTRICTED UPLOAD OF FILE WITH DANGEROUS FILE TYPE CWE-434 Proficy Machine Edition Version 9.00 and prior will upload any file written into the PLC logic folder to the connected PLC. CVE-2022-2791 has been assigned to this vulnerability. A CVSS v3 base score of 5.9 has been assigned; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:R/S:C/C:N/ I:H/A:N ). 3.2.4 IMPROPER VERIFICATION OF CRYPTOGRAPHIC SIGNATURE CWE-347 Proficy Machine Edition Version 9.00 and prior does not properly verify compiled logic (PDT files) and data blocks data (BLD/BLK files). CVE-2022-2790 has been assigned to this vulnerability. A CVSS v3 base score of 5.9 has been assigned; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:R/S:C/C:N/ I:H/A:N ). 3.2.5 INSUFFICIENT VERIFICATION OF DATA AUTHENTICITY CWE-345 Proficy Machine Edition Version 9.00 and prior can display logic that is different than the compiled logic. CVE-2022-2789 has been assigned to this vulnerability. A CVSS v3 base score of 4.7 has been assigned; the CVSS vector string is ( AV:L/AC:H/PR:N/UI:R/S:U/C:N/ I:H/A:N ). 3.2.6 PATH TRAVERSAL: '\..\FILENAME' CWE-29 Proficy Machine Edition Version 9.80 and prior is vulnerable to a ZipSlip attack through an upload procedure which enables attackers to implant a malicious .BLZ file on the PLC. The file can transfer through the engineering station onto Windows in a way that executes the malicious code. CVE-2022-2788 has been assigned to this vulnerability. A CVSS v3 base score of 9.3 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:R/S:C/C:N/ I:H/A:H ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities, Critical Manufacturing, Dams, Defense Industrial Base, Energy, Food and Agriculture, Government Facilities, Information Technology, Transportation Systems, Water and Wastewater Systems o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: United States 3.4 RESEARCHER Sharon Brizinov of Claroty Research reported these vulnerabilities to CISA. 4. MITIGATIONS Emerson recommends users take the following measures to mitigate the risks associated with each of the identified vulnerabilities: o CVE-2022-2793: SRTP and SNP protocols support cryptographically secure authentication using the SRP-6a protocol, a feature which Emerson recommends users employ. Affected devices currently support encrypted authentication for session establishment and when escalating privileges; additional encryption features will be added over time. o CVE-2022-2792: Emerson plans to fix this vulnerability in a future version. Emerson recommends users ensure they are using the latest version of PAC Machine Edition and employ good physical security of devices and transmission paths. o CVE-2022-2791: Emerson recommends operators of the affected devices be well verified and restrict which users can upload files. The affected devices do not have any file verification systems for checking the files that have been uploaded. o CVE-2022-2790: See recommendations for CVE-2022-2791. o CVE-2022-2789: See recommendations for CVE-2022-2791. o CVE-2022-2788: See recommendations for CVE-2022-2791. Emerson recommends Proficy Machine Edition be installed as an administrator, but run as a non-administrator, unless necessary for specific functions. Users should ensure PLCs are not programmed using an untrusted network; PLCs should be programmed using a flat/bridged network. Users should also enable authentication on the PLCs. For additional details on any of these recommendations, see Emerson's security advisory . CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability these vulnerabilities. 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 business networks. 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 at cisa.gov/ics . Several CISA products detailing cyber defense best 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 at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies . Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents. Social Engineering ATTACK CODE CISA also recommends users take the following measures to protect themselves from social engineering attacks: o Do not click web links or open attachments in unsolicited email messages. o Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams. o Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks. No known public exploits specifically target these vulnerabilities. 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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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: https://auscert.org.au/gpg-key/ iQIVAwUBYvxx9skNZI30y1K9AQih7g/+MZ0QhNubXVcBve51NZU3osMUDpdqh2tt e5URtkLDMKLusoS2RfAPJMBWMo7yCmnPWZtusQGsAYpvWabys0VRYDERhwiJYaMI +xdXqF4rRb9pUD1uajX284QswjLipjUbnViozjE/lhNb60JIoM2QNvzGW+Y0EVS9 6MiqmHE/NJFIIXF45knsy+msy9zhUyn5TiF8vHEJKRzRZ12lTQL9s2nGUzpoRvpE 1H5FBpvRmxQylO5MHgIXYYCIaqSI/Xin//IROb2ibfHKqWJjFg7Yw83hx5gf2Z1b mYqFli2Y00JDub27q7sYdvpyFszQu1+qQpz0VxkNj48VWJkjKHsaqQX8FEcK84lL 2rM77Q+HxMjaYslZ5SkEouJSYFlrYPO1iQU9WsH0nyu8AWKcMka/7odyofNw2VB2 qXGITvIOu3KowhNtYgr6NHSo4QyeREvcHsCq2Nbpvyvb4gtDgIiJo8IGIcfea6ZH mbsa6AgkgJBju4cDLHoNoDMACQ6t5yvPdeyxGc6M8ojFirpuiw0J1R67JtGuZtK9 IRtJMpqWhe1vJXKZBBFOZKh8p3vGANfKVAS4nQq1glkL82VxRI+mc1MEN0dvar3x UD2P0wIxwqXCDntnhpc75LTAXxKLSR6fqLuf3NmuI2iTjGmh5nEWq3rsxBIZaEhs 8DhDIsp5ZPc= =CcYY -----END PGP SIGNATURE-----