First published: Wed Oct 27 2021(Updated: )
A vulnerability in the software-based SSL/TLS message handler of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. This vulnerability is due to insufficient validation of SSL/TLS messages when the device performs software-based SSL/TLS decryption. An attacker could exploit this vulnerability by sending a crafted SSL/TLS message to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Note: Datagram TLS (DTLS) messages cannot be used to exploit this vulnerability. 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-ftd-tls-decrypt-dos-BMxYjm8M This advisory is part of the October 2021 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: October 2021 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication.
Credit: This vulnerability was found by Sanmith Prakash Cisco during internal security testing
Affected Software | Affected Version | How to fix |
---|---|---|
Cisco ASA | =9.16<9.16.2 | 9.16.2 |
Cisco FTD Software Releases | >=6.5.0=6.6.0<=6.7.0<6.7.0.3 (Jan 2022)>=6.3.0<=6.4.0<6.4.0.13 (Nov 2021) | 6.7.0.3 (Jan 2022) 6.4.0.13 (Nov 2021) |
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The vulnerability ID is cisco-sa-ftd-tls-decrypt-dos-BMxYjm8M.
The severity of cisco-sa-ftd-tls-decrypt-dos-BMxYjm8M is high.
The Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software are affected by cisco-sa-ftd-tls-decrypt-dos-BMxYjm8M.
An unauthenticated, remote attacker can exploit cisco-sa-ftd-tls-decrypt-dos-BMxYjm8M by causing an affected device to reload, resulting in a denial of service (DoS) condition.
To mitigate cisco-sa-ftd-tls-decrypt-dos-BMxYjm8M, update to the recommended versions of Cisco ASA Software (9.16.2) and Cisco FTD Software (6.7.0.3 or 6.4.0.13).