high
8.6
CWE
400
Advisory Published

cisco-sa-asa-ssl-vpn-dos-qY7BHpjN: Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software SSL/TLS Denial of Service Vulnerability

First published: Wed May 06 2020(Updated: )

A vulnerability in the Secure Sockets Layer (SSL)/Transport Layer Security (TLS) handler of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to exhaust memory resources on the affected device, leading to a denial of service (DoS) condition. The vulnerability is due to improper resource management for inbound SSL/TLS connections. An attacker could exploit this vulnerability by establishing multiple SSL/TLS connections with specific conditions to the affected device. A successful exploit could allow the attacker to exhaust the memory on the affected device, causing the device to stop accepting new SSL/TLS connections and resulting in a DoS condition for services on the device that process SSL/TLS traffic. Manual intervention is required to recover an affected device. Cisco has released software updates that address the vulnerability described in this advisory. 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-ssl-vpn-dos-qY7BHpjN This advisory is part of the May 2020 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication, which includes 12 Cisco Security Advisories that describe 12 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: May 2020 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication.

Credit: This vulnerability was found during the resolution a Cisco TAC support case

Affected SoftwareAffected VersionHow to fix
Cisco ASA Software=9.13<9.13.1.7=9.12<9.12.3.2=9.10<9.10.1.37=9.9<9.9.2.66>=9.7<=9.8<9.8.4.20>=Earlier than 9.6<=9.6<9.6.4.40
9.13.1.7
9.12.3.2
9.10.1.37
9.9.2.66
9.8.4.20
9.6.4.40
Cisco FTD Software>=6.4.0<=6.5.0<6.5.0.5 (future release)Cisco_FTD_Hotfix_H-6.5.0.5-2.sh.REL.tar and laterCisco_FTD_SSP_FP1K_Hotfix_H-6.5.0.5-2.sh.REL.tar and laterCisco_FTD_SSP_FP2K_Hotfix_H-6.5.0.5-2.sh.REL.tar and laterCisco_FTD_SSP_Hotfix_H-6.5.0.5-2.sh.REL.tar and later=6.3.0<6.3.0.6 (future release)Cisco_FTD_Hotfix_AO-6.3.0.6-2.sh.REL.tarCisco_FTD_SSP_FP2K_Hotfix_ AO-6.3.0.6-2.sh.REL.tarCisco_FTD_SSP_Hotfix_ AO-6.3.0.6-2.sh.REL.tar>=Earlier than 6.1.0=6.1.0=6.2.0=6.2.1=6.2.2<=6.2.3<6.2.3.16 (June 2020) Cisco_FTD_Hotfix_DT-6.2.3.16-3.sh.REL.tarCisco_FTD_SSP_FP2K_Hotfix_DT-6.2.3.16-3.sh.REL.tarCisco_FTD_SSP_Hotfix_DT-6.2.3.16-3.sh.REL.tar
6.5.0.5 (future release)Cisco_FTD_Hotfix_H-6.5.0.5-2.sh.REL.tar and laterCisco_FTD_SSP_FP1K_Hotfix_H-6.5.0.5-2.sh.REL.tar and laterCisco_FTD_SSP_FP2K_Hotfix_H-6.5.0.5-2.sh.REL.tar and laterCisco_FTD_SSP_Hotfix_H-6.5.0.5-2.sh.REL.tar and later
6.3.0.6 (future release)Cisco_FTD_Hotfix_AO-6.3.0.6-2.sh.REL.tarCisco_FTD_SSP_FP2K_Hotfix_ AO-6.3.0.6-2.sh.REL.tarCisco_FTD_SSP_Hotfix_ AO-6.3.0.6-2.sh.REL.tar
6.2.3.16 (June 2020) Cisco_FTD_Hotfix_DT-6.2.3.16-3.sh.REL.tarCisco_FTD_SSP_FP2K_Hotfix_DT-6.2.3.16-3.sh.REL.tarCisco_FTD_SSP_Hotfix_DT-6.2.3.16-3.sh.REL.tar

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(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID of this Cisco ASA and FTD SSL/TLS Denial of Service vulnerability?

    The vulnerability ID is cisco-sa-asa-ssl-vpn-dos-qY7BHpjN.

  • What is the severity of the cisco-sa-asa-ssl-vpn-dos-qY7BHpjN vulnerability?

    The severity of the vulnerability is rated as high with a severity value of 8.6.

  • What is the affected software for the cisco-sa-asa-ssl-vpn-dos-qY7BHpjN vulnerability?

    The affected software includes Cisco ASA Software versions 9.6.4.40 and earlier, as well as Cisco FTD Software versions 6.2.3.16 and earlier.

  • What is the remedy for the cisco-sa-asa-ssl-vpn-dos-qY7BHpjN vulnerability?

    The recommended remedy is to upgrade to Cisco ASA Software version 9.6.4.40 or later, and Cisco FTD Software version 6.2.3.16 or later.

  • Where can I find more information about the cisco-sa-asa-ssl-vpn-dos-qY7BHpjN vulnerability?

    You can find more information about the vulnerability on the Cisco Security Advisory page: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ssl-vpn-dos-qY7BHpjN

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