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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.4511 Advisory (icsa-20-353-01) Treck TCP/IP Stack 21 December 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Treck TCP/IP stack 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: Patch/Upgrade CVE Names: CVE-2020-27338 CVE-2020-27337 CVE-2020-27336 CVE-2020-25066 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-20-353-01 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-20-353-01) Treck TCP/IP Stack Original release date: December 18, 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 9.8 o ATTENTION: Exploitable remotely o Vendor: Treck Inc. o Equipment: TCP/IP o Vulnerability : Heap-based Buffer Overflow, Out-of-bounds Read, Out-of-bounds Write The Treck TCP/IP stack may be known by other names such as Kasago TCP/IP, ELMIC, Net+ OS, Quadnet, GHNET v2, Kwiknet, or AMX. 2. RISK EVALUATION Successful exploitation of this vulnerability may allow remote code execution and a denial-of-service condition. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following components of Treck TCP/IP stack Version 6.0.1.67 and prior are affected: o HTTP Server o IPv6 o DHCPv6 3.2 VULNERABILITY OVERVIEW 3.2.1 HEAP-BASED BUFFER OVERFLOW CWE-122 A vulnerability in Treck HTTP Server components allow an attacker to cause a denial-of-service condition. This vulnerability may also result in arbitrary code execution. CVE-2020-25066 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/ C:H/I:H/A:H ). 3.2.2 OUT-OF-BOUNDS WRITE CWE-787 An out-of-bounds write in the IPv6 component may allow an unauthenticated user to potentially cause a possible denial-of-service via network access. CVE-2020-27337 has been assigned to this vulnerability. A CVSS v3 base score of 9.1 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/ C:N/I:H/A:H ). 3.2.3 OUT-OF-BOUNDS READ CWE-125 An issue was discovered in Treck IPv6. An out-of-bound read in the DHCPv6 client component may allow an unauthenticated user to cause a possible denial-of-service via adjacent network access. CVE-2020-27338 has been assigned to this vulnerability. A CVSS v3 base score of 5.9 has been calculated; the CVSS vector string is ( AV:A/AC:H/PR:N/UI:N/S:U/ C:H/I:N/A:H ). 3.2.4 OUT-OF-BOUNDS READ CWE-125 Improper input validation in the IPv6 component may allow an unauthenticated user to cause an out-of-bounds read of up to three bytes via network access. CVE-2020-27336 has been assigned to this vulnerability. A CVSS v3 base score of 3.7 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:N/S:U/ C:L/I:N/A:N ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Information Technology, Healthcare and Public Health, Transportation Systems o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: United States 3.4 RESEARCHER Intel reported these vulnerabilities to Treck. 4. MITIGATIONS Treck recommends users apply the latest version of the affected products (Treck TCP/IP 6.0.1.68 or later versions). To obtain patches, email security@treck.com Treck recommends users who cannot apply the latest patches to implement firewall rules to filter out packets that contain a negative content length in the HTTP header. For more detailed information on the vulnerabilities and the mitigating controls, please see the Treck advisory . 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. High skill level is needed to exploit. 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. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBX9/mS+NLKJtyKPYoAQiLOw/9EtiCv5ixxc01XoJrzWGTXLh0fGz95zJb wkfKPerQUxt5mb9fV+UfbsjWP7vt0Cd1cumBFeOdsokpHFfLw4Wk5hhrhW9hiw03 4B1HwBR3hBvaxoqjMPTI4+DxUkKJfWysIHv6T8crse8pFRuy+zeQU+ANKC+BCZPx THLwTyGerVpi4mHnqrWeUS6vFwh8akdP5zQBSZqZQDYf83EQnFBRCJHM8DNzILxX WLfMdnvH1+mgfR1V2l52IR/OXgifD76lL1wf9Gq/ZYqk9AJ8GKA6o804SPHrMjNp Ii5QEVUOrrIHpDxexdFB/ygGzx25vkLFbeNuLp/9w5HG0MpjwYe3MNLAGhBcz2Dj qCjRoR0jtgzZOCHfMYeHGHP8jTCZBDuauf/i9if2qFoQKfeqWzQawF8LkV45MEhT TxgCKlsuRD3j/kzEo6B/EYrQQaEf0P69NYieniwrVq0HfdKNRf4lDpIYcr8fRsvr /M9/mtBlB1Y+dnaVYZX6X4V6LvgOjk6iFOi3bUV+trDg3tpp15NBBahkYsZ1R11w UKs/CPTOEG8lBP2/XsK4EDVj1KHOS/KHdHokRM+ZJdGeqLnZoOV4pElflemKOAk1 E2QTA7E0/AoHgWabXKMWR8ZzPBy6CEJBPdyw0LvV+l5NcL1iKZQ8ENGYXjHVVAg3 7nhRIU4B+mE= =cHx4 -----END PGP SIGNATURE-----