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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.3680 Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Denial of Service Vulnerability 26 October 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Adaptive Security Appliance Software Firepower Threat Defense Software Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2020-3554 Reference: ESB-2020.3642 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-dos-QFcNEPfx - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Denial of Service Vulnerability Priority: High Advisory ID: cisco-sa-asaftd-dos-QFcNEPfx First Published: 2020 October 21 16:00 GMT Last Updated: 2020 October 23 13:16 GMT Version 2.1: Final Workarounds: YesCisco Bug IDs: CSCvt35897 CVE-2020-3554 CWE-400 CVSS Score: 8.6 AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X Summary o Update from October 22nd, 2020 : Cisco has become aware of a new Cisco Adaptive Security Appliance vulnerability that could affect the fixed releases recommended for code trains 9.13 and 9.14 in the Fixed Software section of this advisory. See the Cisco Adaptive Security Appliance Software SSL/TLS Denial of Service Vulnerability for additional information. A vulnerability in the TCP packet 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 on an affected device. The vulnerability is due to a memory exhaustion condition. An attacker could exploit this vulnerability by sending a high rate of crafted TCP traffic through an affected device. A successful exploit could allow the attacker to exhaust device resources, resulting in a DoS condition for traffic transiting the affected device. Cisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability. This advisory is available at the following link: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/ cisco-sa-asaftd-dos-QFcNEPfx This advisory is part of the October 2020 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication, which includes 17 Cisco Security Advisories that describe 17 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: October 2020 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication . Affected Products o Vulnerable Products This vulnerability affects vulnerable releases of Cisco ASA Software and Cisco FTD Software. For information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory. 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. Indicators of Compromise o A device may have been exploited by this vulnerability if the show blocks command indicates a leak of 9344-byte memory blocks. The device may stop passing traffic or performance could degrade due to this memory leak. In this example, the memory blocks of 9344 bytes are leaked, resulting in zero (0) blocks being available. # show blocks SIZE MAX LOW CNT 0 1450 1448 1450 4 100 99 99 80 1000 950 984 256 4148 3898 4040 1550 6279 6184 6258 2048 600 598 600 2560 164 164 164 4096 100 100 100 8192 100 100 100 9344 60000 0 0 16384 102 102 102 65536 16 16 16 Contact the Cisco Technical Assistance Center (TAC) if additional assistance is required to determine whether the device has been impacted by exploitation of this vulnerability. Workarounds o As a workaround, an administrator may implement the fragment reassembly full [interface-name] command. There may be a performance impact when implementing this command. Fixed Software o Cisco has released free software updates that address the vulnerability described in this advisory. 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. 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 vulnerabilities described in this bundle and which release includes fixes for those vulnerabilities. Cisco ASA Software Cisco ASA First Fixed Release First Fixed Release for All the Software for This Vulnerabilities Described in the Bundle Release Vulnerability of Advisories Earlier than Not vulnerable. Migrate to a fixed release. 9.6 ^1 9.6 ^1 Not vulnerable. 9.6.4.45 9.7 ^1 Not vulnerable. Migrate to a fixed release. 9.8 Not vulnerable. 9.8.4.29 9.9 Not vulnerable. 9.9.2.80 9.10 Not vulnerable. 9.10.1.44 9.12 9.12.4.3 9.12.4.4 9.13 9.13.1.13 9.13.1.13 9.14 9.14.1.30 9.14.1.30 1. Cisco ASA Software releases 9.7 and earlier have reached end of software maintenance. Customers are advised to migrate to a supported release that includes the fix for this vulnerability. Cisco FTD Software Cisco FTD First Fixed Release First Fixed Release for All the Software for This Vulnerabilities Described in the Bundle Release Vulnerability of Advisories Earlier than Not vulnerable. Migrate to a fixed release. 6.2.2 ^1 6.2.2 Not vulnerable. Migrate to a fixed release. 6.2.3 Not vulnerable. Migrate to a fixed release. 6.3.0 Not vulnerable. Migrate to a fixed release. 6.4.0 6.4.0.10 Migrate to a fixed release. 6.5.0 6.5.0.5 (future Migrate to a fixed release. release) 6.6.0 6.6.1 6.6.1 1. Cisco FMC and FTD Software releases 6.0.1 and earlier, as well as releases 6.2.0 and 6.2.1, have reached end of software maintenance. Customers are advised to migrate to a supported release that includes the fix for this vulnerability. To upgrade to a fixed release of Cisco FTD Software, do one of the following: For devices that are managed by using Cisco Firepower Management Center (FMC), use the FMC interface to install the upgrade. After installation is complete, reapply the access control policy. For devices that are managed by using Cisco Firepower Device Manager (FDM), use the FDM interface to install the upgrade. After installation is complete, reapply the access control policy. 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 by Santosh Krishnamurthy of Cisco 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. Related to This Advisory o Cisco Event Response: October 2020 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/ cisco-sa-asaftd-dos-QFcNEPfx Revision History o +---------+-----------------------------+----------+--------+-------------+ | Version | Description | Section | Status | Date | +---------+-----------------------------+----------+--------+-------------+ | 2.1 | Corrected the first fixed | Fixed | Final | 2020-OCT-23 | | | release for ASA 9.14. | Software | | | +---------+-----------------------------+----------+--------+-------------+ | | Updated the Summary section | | | | | | to provide information on a | | | | | 2.0 | new vulnerability affecting | Summary | Final | 2020-OCT-22 | | | fixed release | | | | | | recommendations for code | | | | | | trains 9.13 and 9.14. | | | | +---------+-----------------------------+----------+--------+-------------+ | 1.0 | Initial public release. | - | Final | 2020-OCT-21 | +---------+-----------------------------+----------+--------+-------------+ - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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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). 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