Cisco Security Advisory - Multiple Cisco Products Snort TCP Fast Open File Policy Bypass Vulnerability

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Multiple Cisco Products Snort TCP Fast Open File Policy Bypass Vulnerability

Multiple Cisco products are affected by a vulnerability with TCP Fast Open (TFO) when used in conjunction with the Snort detection engine that could allow an unauthenticated, remote attacker to bypass a configured file policy for HTTP.

The vulnerability is due to incorrect detection of the HTTP payload if it is contained at least partially within the TFO connection handshake. An attacker could exploit this vulnerability by sending crafted TFO packets with an HTTP payload through an affected device. A successful exploit could allow the attacker to bypass configured file policy for HTTP packets and deliver a malicious payload.

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-snort-tfo-bypass-MmzZrtes

     
         
Security Impact Rating:  Medium
   
   
       
CVE: CVE-2021-1224
Source: Multiple Cisco Products Snort TCP Fast Open File Policy Bypass Vulnerability