cisco-sa-asa-dos-tL4uA4AA: Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Remote Access SSL VPN Denial of Service Vulnerability
First published: Wed Apr 27 2022(Updated: )
A vulnerability in the remote access SSL 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 on an affected device. This vulnerability is due to improper validation of errors that are logged as a result of client connections that are made using remote access VPN. An attacker could exploit this vulnerability by sending crafted requests to an affected system. A successful exploit could allow the attacker to cause the affected device to restart, 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-dos-tL4uA4AA 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.
Credit: This vulnerability was found during the resolution a Cisco TAC support case
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco ASA Software | =9.16<9.16.2.11 | 9.16.2.11 |
| Cisco FTD Software | =7.0.0<7.0.2 (May 2022)>=6.5.0=6.6.0<=6.7.0<Cisco_FTD_Hotfix_AA-6.7.0.4-2.sh.REL.tarCisco_FTD_SSP_FP1K_Hotfix_AA-6.7.0.4-2.sh.REL.tarCisco_FTD_SSP_FP2K_Hotfix_AA-6.7.0.4-2.sh.REL.tarCisco_FTD_SSP_Hotfix_AA-6.7.0.4-2.sh.REL.tar>=6.3.0<=6.4.0<6.4.0.13 | 7.0.2 (May 2022) Cisco_FTD_Hotfix_AA-6.7.0.4-2.sh.REL.tarCisco_FTD_SSP_FP1K_Hotfix_AA-6.7.0.4-2.sh.REL.tarCisco_FTD_SSP_FP2K_Hotfix_AA-6.7.0.4-2.sh.REL.tarCisco_FTD_SSP_Hotfix_AA-6.7.0.4-2.sh.REL.tar 6.4.0.13 |
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Reference Links
Frequently Asked Questions
What is the vulnerability ID of this Cisco ASA and FTD vulnerability?
The vulnerability ID is cisco-sa-asa-dos-tL4uA4AA.
What is the severity rating of cisco-sa-asa-dos-tL4uA4AA?
The severity rating of cisco-sa-asa-dos-tL4uA4AA is 8.6 (high).
What is the affected software for cisco-sa-asa-dos-tL4uA4AA?
The affected software for cisco-sa-asa-dos-tL4uA4AA is Cisco ASA Software versions 9.16 up to but excluding 9.16.2.11 and Cisco FTD Software versions 7.0.0 up to but excluding 7.0.2 (May 2022), 6.5.0 up to but including 6.7.0, and 6.3.0 up to but including 6.4.0.13.
How can an unauthenticated remote attacker exploit cisco-sa-asa-dos-tL4uA4AA?
An unauthenticated remote attacker can exploit cisco-sa-asa-dos-tL4uA4AA by sending specially crafted SSL/TLS messages to the affected device's remote access SSL VPN interface, causing a denial of service (DoS) condition.
Is there a remedy available for cisco-sa-asa-dos-tL4uA4AA?
Yes, there are specific versions of Cisco ASA Software and FTD Software that have been identified as a remedy for cisco-sa-asa-dos-tL4uA4AA. Please refer to the Cisco Security Advisory for the exact versions.
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