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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.4480 Advisory (icsa-20-352-01) Emerson Rosemount X-STREAM 18 December 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Emerson Rosemount X-STREAM Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2020-27254 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-20-352-01 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-20-352-01) Emerson Rosemount X-STREAM Original release date: December 17, 2020 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 7.5 o ATTENTION: Exploitable remotely/low skill level to exploit o Vendor: Emerson o Equipment: Rosemount X-STREAM Gas Analyzer o Vulnerability: Improper Authentication 2. RISK EVALUATION Successful exploitation of this vulnerability could allow an attacker through a specially crafted URL to download files and obtain sensitive information. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of Emerson's Rosemount X-STREAM gas analysis software, are affected: o X-STREAM enhanced XEGP - all revisions o X-STREAM enhanced XEGK - all revisions o X-STREAM enhanced XEFD - all revisions o X-STREAM enhanced XEXF - all revisions 3.2 VULNERABILITY OVERVIEW 3.2.1 IMPROPER AUTHENTICATION CWE-287 The affected products are vulnerable to improper authentication for accessing log and backup data, which could allow an attacker with a specially crafted URL to obtain access to sensitive information. CVE-2020-27254 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U /C:H/I:N/A:N ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Energy, Chemical o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: United States 3.4 RESEARCHER Maxim Rupp reported this vulnerability to CISA. 4. MITIGATIONS Emerson recommends users update the firmware of any affected products. A new release that addresses the issues identified in this Cybersecurity Notification impacting the affected products is available. For information on how to obtain the update contact TechSupport.Hasselroth@emerson.com In addition, Emerson recommends users of affected products continue to utilize current cybersecurity industry best practices. In the event such infrastructure is not implemented within an end user's network, action should be taken to ensure the affected products are connected to a well-protected network and properly segmented from the Internet. For more information on the Emerson Security notifications page . 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. o Do not click web links or open unsolicited attachments in 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 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. 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. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBX9wNSONLKJtyKPYoAQhusA/+LrZmrEObFh1u7eyMtXD7iRVnVD0XqaZQ hI8RSdm9z7DTYf5N+23UIPncpEdpJyL6PBJbTgxfPWX5/ZhJA6BkDfiNdZW7NXjv cG2ga+vN4BEBSuFg4peLDI2ecGcOHXag8uRPqBERzAL3Vgp5/LufoPI6x6Y/Eg1S EnXDfo48Ky+jYJEH6nda2SZNLvvFflp+rLgivXuj0rP7QJkE+AzSwKNndFqarDvX 6mG11LQUASzQQZRpUjXcZjSF/x8ReBN4QaAsS8H3sbOKEW6NA2gKCPYyXC6O1P62 RvpgQd0S5lGGvQKgN2j1toiiCxpDNPq6vroNWGpZzQ6osOg2/TG/lkNief5S1KG7 iUccdS2+gEzFDjhMXHknI9yGqdnuA0h13pia+sXtqsv2JZFy3iRH7rBUttyj7Hqr Lq2PZKkWXTINjI3J4QLeqGj1rTh8Kts3H8LcxspTmWQoNLMY9dE9AEmmqHvjpgx4 EuMR8M/sY9oiTFbrpmca703Y1nuZNpgVHO/3FyUv4k+IDKqK/IooauI3F2j68APU tkFPVX1G8hZfbS7QXKK1ZWavJiCeEaOXuxwYt95Fhr/kEMnQqESBGeDVS8Hr7GXL 36lXnr2MGQNeIwv3Qp5ydpIEdo4cliRVIn+C3JVz1g6Y7AkI/dD5DyJ9CSc+03v5 lUs12clfw3U= =5Eq/ -----END PGP SIGNATURE-----