Cisco Security Advisory - Cisco Firepower Threat Defense Software SIP and Snort 3 Detection Engine Denial of Service Vulnerability

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Cisco Firepower Threat Defense Software SIP and Snort 3 Detection Engine Denial of Service Vulnerability

A vulnerability in the interaction of SIP and Snort 3 for Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 3 detection engine to restart.

This vulnerability is due to a lack of error-checking when SIP bidirectional flows are being inspected by Snort 3. An attacker could exploit this vulnerability by sending a stream of crafted SIP traffic through an interface on the targeted device. A successful exploit could allow the attacker to trigger a restart of the Snort 3 process, resulting in a denial of service (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-ftdsnort3sip-dos-A4cHeArC

This advisory is part of the November 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: November 2022 Semiannual Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication.

     
         
Security Impact Rating:  Medium
   
   
       
CVE: CVE-2022-20950
Source: Cisco Firepower Threat Defense Software SIP and Snort 3 Detection Engine Denial of Service Vulnerability