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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2023.6366 Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software ICMPv6 Message Processing Denial of Service Vulnerability 2 November 2023 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Adaptive Security Appliance Software Firepower Threat Defense Software Publisher: Cisco Systems Operating System: Cisco Resolution: Patch/Upgrade CVE Names: CVE-2023-20086 Original Bulletin: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-icmpv6-t5TzqwNd Comment: CVSS (Max): 8.6 CVE-2023-20086 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H) CVSS Source: Cisco Systems Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software ICMPv6 Message Processing Denial of Service Vulnerability Priority: High Advisory ID: cisco-sa-asa-icmpv6-t5TzqwNd First Published: 2023 November 1 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCwd77581 CVE Names: CVE-2023-20086 Summary o A vulnerability in ICMPv6 processing of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. This vulnerability is due to improper processing of ICMPv6 messages. An attacker could exploit this vulnerability by sending crafted ICMPv6 messages to a targeted Cisco ASA or FTD system with IPv6 enabled. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-icmpv6-t5TzqwNd This advisory is part of the November 2023 release of the Cisco ASA, FTD, and FMC Security Advisory Bundled publication. For a complete list of the advisories and links to them, see Cisco Event Response: November 2023 Semiannual Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication . Affected Products o Vulnerable Products This vulnerability affects Cisco ASA Software and FTD Software when it is configured with the IPv6 protocol. Note: Devices that have only IPv4 interfaces configured are not affected. Determine the Device Configuration To determine which interfaces have assigned IPv6 addresses on a device that is running an affected software release and has IPv6 enabled, use the show ipv6 interface brief CLI command, as shown in the following example: ciscodevice# show ipv6 interface brief GigabitEthernet0/0 [up/up] 2001:db8:32:16:::1 fdf8:f53b:82e4::53 management [up/up] unassigned In addition, if IPv6 is enabled, the ipv6 enable interface configuration command is present in the configuration. The following example shows the output of an affected configuration: ciscodevice# show running-config interface interface GigabitEthernet0/0 ... ipv6 enable ... Products Confirmed Not Vulnerable Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability. Cisco has confirmed that this vulnerability does not affect Cisco Firepower Management Center (FMC) Software. Workarounds o There are no workarounds that address this vulnerability. Fixed Software o Cisco has released free software updates that address the vulnerability described in this advisory. Customers with service contracts that entitle them to regular software updates should obtain security fixes through their usual update channels. Customers may only install and expect support for software versions and feature sets for which they have purchased a license. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license: https://www.cisco.com/c/en/us/products/end-user-license-agreement.html Additionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. In most cases this will be a maintenance upgrade to software that was previously purchased. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades. The Cisco Support and Downloads page on Cisco.com provides information about licensing and downloads. This page can also display customer device support coverage for customers who use the My Devices tool. When considering software upgrades , customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page , to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers. Customers Without Service Contracts Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c /en/us/support/web/tsd-cisco-worldwide-contacts.html Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade. Cisco ASA, FMC, and FTD Software To help customers determine their exposure to vulnerabilities in Cisco ASA, FMC, and FTD Software, Cisco provides the Cisco Software Checker . This tool identifies any Cisco security advisories that impact a specific software release and the earliest release that fixes the vulnerabilities that are described in each advisory ("First Fixed"). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities that are described in all the advisories that the Software Checker identifies ("Combined First Fixed"). To use the tool, go to the Cisco Software Checker page and follow the instructions. Alternatively, use the following form to search for vulnerabilities that affect a specific software release. To use the form, follow these steps: 1. Choose which advisories the tool will search-all advisories, only advisories with a Critical or High Security Impact Rating (SIR) , or only this advisory. 2. Choose the appropriate software. 3. Choose the appropriate platform. 4. Enter a release number-for example, 9.16.2.11 for Cisco ASA Software or 6.6.7 for Cisco FTD Software. 5. Click Check . [2 ] [ ] [Critical,High,Medium] [Only this advisory ] [Cisco ASA Software] [Any Platform ] [ ] [Check] For instructions on upgrading your FTD device, see Cisco Firepower Management Center Upgrade Guide . Exploitation and Public Announcements o The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory. Source o This vulnerability was found during internal security testing. Cisco Security Vulnerability Policy o To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy . This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco. Subscribe to Cisco Security Notifications o Subscribe Related to This Advisory o Cisco Event Response: November 2023 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication URL o https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-icmpv6-t5TzqwNd Revision History o +----------+---------------------------+----------+--------+--------------+ | Version | Description | Section | Status | Date | +----------+---------------------------+----------+--------+--------------+ | 1.0 | Initial public release. | - | Final | 2023-NOV-01 | +----------+---------------------------+----------+--------+--------------+ Legal Disclaimer o THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: https://auscert.org.au/gpg-key/ iQIVAwUBZUMMKckNZI30y1K9AQh3dg/8DiBuoeu6+9Vb23nZDTsEgaOTNCgWFTAr 3pdGjmREHMX1pKxc1EpD1a3vkf1haZzJpWa3wvDWKltp41zWdkDKZagvrH6ALNZH hWIUwwjvQxHA1H2GsY7I4tvzzSJ1uwCbBRL1+Y/jkl8+7C5kWXInLnsmOqIvXMsZ mmGrw5DQ59xP0naRPyKmk1wFhjuKHo3dHzEFurwbK0P8KSb83xJhzezket+3FBxL EPuxnDRjbioJd1j8eT0J+l+BoLkboTwTd3HWuaiuPSso7OmYifl+7LmA2EUTBr9G BN23mf4cK+vlPiGYZfTC11wgnH7CXFtmOfEuzcYH6P/3ueD/hJYgaDoni0WThT77 bRu0bg8P5msyGn3POKlsixTw6QM8lLUxLcQ/BVLTEOMy/AdQyWBWOG5Hwuyec5a6 49WaXJJjpRVWIByioWEV/u0ccPZy+FaMQ+7nXg3zSygp3cuCRrgM92PG1BTskDBC wRn3T4hAfY/2ekPT3F5aMRPvFEMB/HMcoRAHF9UYDKdv+QA/OdzlAvm8HiHCbg1w HQs9tpseQ4YJ5ShVzUpz0RRN0sMU5DzgTDY9uK54IV84Aqr57sHX64917JJVpeyQ jKN/ld8gEeSlnXZcpGAfmyt2HvrcREefuVJjpKw87BeLZZ8f1NqoYIYlHeYDFJp+ C+KXHrmVE7M= =vghK -----END PGP SIGNATURE-----