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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.3308 Advisory (icsa-21-278-04) Honeywell Experion PKS and ACE Controllers 6 October 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Honeywell Experion PKS and ACE Controllers Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Access Confidential Data -- Remote/Unauthenticated Resolution: Mitigation CVE Names: CVE-2021-38399 CVE-2021-38397 CVE-2021-38395 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-21-278-04 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-21-278-04) Honeywell Experion PKS and ACE Controllers Original release date: October 05, 2021 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 10.0 o ATTENTION: Exploitable remotely/low attack complexity o Vendor: Honeywell o Equipment: Experion Process Knowledge System (PKS) C200, C200E, C300 and ACE Controllers o Vulnerabilities: Unrestricted Upload of File with Dangerous Type, Relative Path Traversal, Improper Neutralization of Special Elements in Output Used by a Downstream Component 2. RISK EVALUATION Successful exploitation of these vulnerabilities could lead to remote code execution and denial-of-service conditions. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of Experion PKS, a process control system, are affected: o C200: All versions o C200E: All versions o C300 and ACE controllers: All versions 3.2 VULNERABILITY OVERVIEW 3.2.1 UNRESTRICTED UPLOAD OF FILE WITH DANGEROUS TYPE CWE-434 The affected product is vulnerable to unrestricted file uploads, which may allow an attacker to remotely execute arbitrary code and cause a denial-of-service condition. CVE-2021-38397 has been assigned to this vulnerability. A CVSS v3 base score of 10.0 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:C/C:H /I:H/A:H ). 3.2.2 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS IN OUTPUT USED BY A DOWNSTREAM COMPONENT CWE-74 The affected product is vulnerable to improper neutralization of special elements in output, which may allow an attacker to remotely execute arbitrary code and cause a denial-of-service condition. CVE-2021-38395 has been assigned to this vulnerability. A CVSS v3 base score of 9.1 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:N/ I:H/A:H ). 3.2.3 RELATIVE PATH TRAVERSAL CWE-23 The affected product is vulnerable to relative path traversal, which may allow an attacker access to unauthorized files and directories. CVE-2021-38399 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been assigned; 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: Critical Manufacturing o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Canada 3.4 RESEARCHER Rei Henigman and Nadav Erez of Claroty reported these vulnerabilities to CISA. 4. MITIGATIONS Honeywell recommends users follow all guidance in the Experion Network and Security Planning Guide to prevent attacks by malicious actors. Additional information can be found in Honeywell Support document SN2021-02-22-01 . 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 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 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. 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. 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 iQIVAwUBYV0O/uNLKJtyKPYoAQjDpQ//Zyq4t7o0ubrq/UiD4shLM7M/c2jGVJ57 6DMRA7WW1cxbEMX1UKdki47yGLh06KdR0SD+fLzN7fm2lYIUhO8s8m2dQiSZFoG4 Mmhhig/CyrjImpeGTyodGc7Kc5x9pm+3GFre65Z6gLHcq1K50Bx9Zal6CJ2M3wz/ 3KhmWzqdaq9pc41Rh0lvyibg7kVZM31/qF57hZLraWD1F2JUlG5Vr6BN2bzVK9IJ /U8hWhkzrgI8tXoEWAEKfZDS5mo2qIA1tXom45EmCFrLCJTGaajcT6aDqE2UsfDT OAsgyrookCzCLKu5JYEQeUIehuGxhasQFec7RWDLZJPiWArkVAFNuga/yh8a0ng/ qS6J+kDWk7arE2OtVjlu1XZZqhnkpbp0/UBWbKFkNjOc1CvcEvf+wm7/TecmuNtY 5uL0FJLLfONFL17F9XNVdatEJJDfYbRokF2Qqzj8tGILRgSyyaQOHJKLxapIKKd3 ECA3D830RYEoq7fGJjUu2RMsoHnVaCcOLYzD92Vh7qdZ30to6oxOdVlkbnHAeyfV 2DLsLwt4K9cZ1reduGligPFZ9jO9vrf8uaDKN5Jk9BwSw6M8emaf3sRp5frZQuoQ F2N90rBPX6VuUWvbf0RC08SqGruLyxeoOwSm3AVe2vC2eWTxuAXgSEWA/6GYNNcB JWK6uCLouoY= =QA9g -----END PGP SIGNATURE-----