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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2022.4797 Advisory (icsa-22-270-03) Rockwell Automation ThinManager ThinServer 28 September 2022 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Rockwell Automation ThinManager ThinServer Publisher: ICS-CERT Operating System: Network Appliance Resolution: Patch/Upgrade CVE Names: CVE-2022-38742 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-22-270-03 Comment: CVSS (Max): 8.1 CVE-2022-38742 (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H) CVSS Source: ICS-CERT Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-22-270-03) Rockwell Automation ThinManager ThinServer Original release date: September 27, 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 8.1 o ATTENTION: Exploitable remotely o Vendor: Rockwell Automation o Equipment: ThinManager ThinServer o Vulnerability: Heap-based Buffer Overflow 2. RISK EVALUATION Successful exploitation of this vulnerability could lead to the software crashing; a buffer overflow condition may allow remote code execution. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS Rockwell Automation reports this vulnerability affects the following versions of ThinManager ThinServer, a thin client and remote desktop protocol (RDP) server management software: o Versions 11.0.0 through 11.0.4 o Versions 11.1.0 through 11.1.4 o Versions 11.2.0 through 11.2.5 o Versions 12.0.0 through 12.0.2 o Versions 12.1.0 through 12.1.3 o Version 13.0.0 3.2 VULNERABILITY OVERVIEW 3.2.1 HEAP-BASED BUFFER OVERFLOW CWE-122 The affected product is vulnerable to a heap-based buffer overflow. An attacker could send a specifically crafted TFTP or HTTPS request, causing a heap-based buffer overflow that crashes the ThinServer process. This could expose the server to arbitrary remote code execution. CVE-2022-38742 has been assigned to this vulnerability. A CVSS v3 base score of 8.1 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:N/S:U/ C:H/I:H/A:H ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: United States 3.4 RESEARCHER rgod, working with Trend Micro Zero Day Initiative, reported this vulnerability to Rockwell Automation and CISA. 4. MITIGATIONS Rockwell Automation recommends users update their products to the latest patched versions: o Versions 11.0.0 through 11.0.4: Update to Version 11.00.05 o Versions 11.1.0 through 11.1.4: Update to Version 11.01.05 o Versions 11.2.0 through 11.2.5: Update to Version 11.02.06 o Versions 12.0.0 through 12.0.2: Update to Version 12.00.03 o Versions 12.1.0 through 12.1.3: Update to Version 12.01.04 o Version 13.0.0: Update to Version 13.00.01 Rockwell Automation recommends users unable to update to the patched versions to block network access to the ThinManager TFTP and HTTPS ports from endpoints other than ThinManager managed thin clients. Users can access security best practices at Rockwell Automation's Knowledgebase article, QA43240 Security Best Practices . For more information, users should see Rockwell Automation's security advisory (login required) . 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. No known public exploits specifically target this vulnerability. This vulnerability has a high attack complexity. For any questions related to this report, please contact the CISA at: Email: CISAservicedesk@cisa.dhs.gov Toll Free: 1-888-282-0870 - --------------------------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: https://auscert.org.au/gpg-key/ iQIVAwUBYzO5OckNZI30y1K9AQjJyA/9Hq0yI7FgF3A7d6lNQ4zHd5/xwR9sK39J 84AJc3VxN2QmBn+AEgd9MMoNNr4UGodWIsMx/R+RH+QHiRY8p5wa/V2V/5TnR9Df e7CkBLdtImlduWy/FRixq7vZxcgZx58095dxfE75rG3yiFTJzf1qDyovKyrNUsbW 3JHtNuCYxpVtFHXQmB8Ss3LL5zQvkzaqWpM+wLqOWJbpU09OBMNfdT7KzBvLxuwp +ytKi5sZFtESNnq6XssJ+zsl12hLYGAXA0Xk9rFEm4RcouKjtkTlEhgQPiJZ3DRA kyJPRaq3/AZfZ9RRWiRW7ZKDsR43o8396ZITs9pBeM+t7hUVSDcGFAO0XxB3Hbsn NURiN7lkSBzHhEYuMp4wWqQoiu2x3jswO2evAUoFkI5FJPJ8ayS0m6dCTg7u08PR xVCAgVywlBfy46mo/xoAATFoB+zsXFGKvvu4cwcEy6G48wGrUwzNYnV+ZxgWr6pL /H2Csfy7z0II2E6YMMVVnENysUqkQNWKG5APin2t0faane2wggV2rFaJfzPg/uI7 L2y4amhK3DSvBRXsqbNWUpctEXoHz+HWl3XyLb1aggRgu/ygioJElmiKpkUXHUrj vlgGlfE5ifE0H7vBs2qZFx6IznFljs9aibbr6h5cPBLtqib7pNainASIlfrpbql7 NF1lMYJHY54= =E51O -----END PGP SIGNATURE-----