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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2022.1912.3 Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Interface Denial of Service Vulnerability 11 November 2022 =========================================================================== 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-2022-20745 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asafdt-webvpn-dos-tzPSYern Revision History: November 11 2022: Updated Subject to include CVSS Score November 10 2022: Vendor updated bulletin April 29 2022: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Interface Denial of Service Vulnerability Priority: High Advisory ID: cisco-sa-asafdt-webvpn-dos-tzPSYern First Published: 2022 April 27 16:00 GMT Last Updated: 2022 November 9 16:02 GMT Version 1.2: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvz70595 CSCwb87950 CSCwb93914 CVE Names: CVE-2022-20745 CWEs: CWE-20 Summary o A vulnerability in the web services interface for remote access VPN features 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 input validation when parsing HTTPS requests. An attacker could exploit this vulnerability by sending a crafted HTTPS request to an affected device. 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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asafdt-webvpn-dos-tzPSYern This advisory is part of the April 2022 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: April 2022 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication . Affected Products o Vulnerable Products This vulnerability affects Cisco products if they are running a vulnerable release of Cisco ASA Software or Cisco FTD Software with a vulnerable remote access VPN configuration. For information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory. Determine the ASA Software Configuration To determine whether the software has a vulnerable feature configured, use the show running-config CLI command. In the following table, the left column lists the Cisco ASA Software features that are vulnerable. The right column indicates the basic configuration for each feature from the show running-config CLI command. If a device is running a vulnerable release and has one of these features configured, it is vulnerable. Cisco ASA Feature Vulnerable Configuration AnyConnect Internet Key Exchange crypto ikev2 enable client-services port Version 2 Remote Access (with client services) webvpn AnyConnect SSL VPN enable Clientless SSL VPN webvpn enable Determine the FTD Software Configuration To determine whether the software has a vulnerable feature configured, use the show running-config CLI command. In the following table, the left column lists the Cisco FTD Software features that are vulnerable. The right column indicates the basic configuration for each feature from the show running-config CLI command. If a device is running a vulnerable release and has one of these features configured, it is vulnerable. Cisco FTD Feature Vulnerable Configuration AnyConnect Internet Key Exchange crypto ikev2 enable client-services port Version 2 Remote Access (with client services) ^1,2 AnyConnect SSL VPN ^1,2 webvpn enable 1. Remote Access VPN features were introduced in Cisco FTD Software Release 6.2.2. 2. Remote Access VPN features are enabled by using Devices > VPN > Remote Access in Cisco Firepower Management Center (FMC) or by using Device > Remote Access VPN in Cisco Firepower Device Manager (FDM). 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. Fixed Releases In the following table(s), the left column lists Cisco software releases. The center column indicates whether a release is affected by the vulnerability described in this advisory and the first release that includes the fix for this vulnerability. The right column indicates whether a release is affected by any of the Critical or High SIR vulnerabilities described in this bundle and which release includes fixes for those vulnerabilities. ASA Software Cisco ASA First Fixed Release for First Fixed Release for Software Release CSCvz70595 CSCwb87950 and CSCwb93914 9.6 and earlier ^ Not vulnerable. Not vulnerable. 1 9.7 ^1 Migrate to a fixed Migrate to a fixed release. release. 9.8 9.8.4.44 9.8.4.46 9.9 ^1 Migrate to a fixed Migrate to a fixed release. release. 9.10 ^1 Migrate to a fixed Migrate to a fixed release. release. 9.12 9.12.4.35 9.12.4.52 9.13 ^1 Migrate to a fixed Migrate to a fixed release. release. 9.14 9.14.3.13 9.14.4.16 9.15 9.15.1.21 Migrate to a fixed release. 9.16 9.16.2.7 9.16.3.15 9.17 Not vulnerable. 9.17.1.16 9.18 Not vulnerable. 9.18.1.3 1. Cisco ASA Software releases 9.7 and earlier, as well as releases 9.9, 9.10, and 9.13, have reached end of software maintenance . Customers are advised to migrate to a supported release that includes the fix for this vulnerability. FTD Software Cisco First Fixed Release for CSCvz70595 First Fixed FTD Release for Software CSCwb87950 and Release CSCwb93914 6.1.0 and Not vulnerable. Not vulnerable. earlier ^1 6.2.2 ^1 Migrate to a fixed release. Migrate to a fixed release. 6.2.3 Migrate to a fixed release. Migrate to a fixed release. 6.3.0 ^1 Migrate to a fixed release. Migrate to a fixed release. 6.4.0 6.4.0.13 6.4.0.16 6.5.0 ^1 Migrate to a fixed release. Migrate to a fixed release. 6.6.0 6.6.5.1 6.6.7.1 Cisco_FTD_Hotfix_AA-6.7.0.4-2.sh.REL.tar 6.7.0 Cisco_FTD_SSP_FP1K_Hotfix_AA-6.7.0.4-2.sh.REL.tar Migrate to a Cisco_FTD_SSP_FP2K_Hotfix_AA-6.7.0.4-2.sh.REL.tar fixed release. Cisco_FTD_SSP_Hotfix_AA-6.7.0.4-2.sh.REL.tar 7.0.0 7.0.2 7.0.4 7.1.0 Not vulnerable. 7.1.0.3 7.2.0 Not vulnerable. 7.2.1 1. Cisco FMC and FTD Software releases 6.2.2 and earlier, as well as releases 6.3.0 and 6.5.0, have reached end of software maintenance . Customers are advised to migrate to a supported release that includes the fix for this vulnerability. For instructions on upgrading your FTD device, see Cisco Firepower Management Center Upgrade Guide . The Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory. Exploitation and Public Announcements o The Cisco 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 originally found during the resolution of a Cisco TAC support case. Cisco would like to thank Saleh Iskandar from Indonesia for reporting that the fix for the vulnerability was incomplete. 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. Related to This Advisory o Cisco Event Response: April 2022 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asafdt-webvpn-dos-tzPSYern Revision History o +---------+----------------------------+-----------+--------+-------------+ | Version | Description | Section | Status | Date | +---------+----------------------------+-----------+--------+-------------+ | | Updated fixed release | | | | | | tables to reflect | Fixed | | | | 1.2 | additonal fixes for Cisco | Software, | Final | 2022-NOV-09 | | | bugs CSCwb87950 and | Source | | | | | CSCwb93914. Also updated | | | | | | source. | | | | +---------+----------------------------+-----------+--------+-------------+ | 1.1 | Updated ASA 9.8 first | Fixed | Final | 2022-JUN-01 | | | fixed release information. | Software | | | +---------+----------------------------+-----------+--------+-------------+ | 1.0 | Initial public release. | - | Final | 2022-APR-27 | +---------+----------------------------+-----------+--------+-------------+ - --------------------------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. 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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). 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