CVE-2020-3285

A vulnerability in the Transport Layer Security version 1.3 (TLS 1.3) policy with URL category functionality for Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass a configured TLS 1.3 policy to block traffic for a specific URL. The vulnerability is due to a logic error with Snort handling of the connection with the TLS 1.3 policy and URL category configuration. An attacker could exploit this vulnerability by sending crafted TLS 1.3 connections to an affected device. A successful exploit could allow the attacker to bypass the TLS 1.3 policy and access URLs that are outside the affected device and normally would be dropped.

A vulnerability in the Transport Layer Security version 1.3 (TLS 1.3) policy with URL category functionality for Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass a configured TLS 1.3 policy to block traffic for a specific URL. The vulnerability is due to a logic error with Snort handling of the connection with the TLS 1.3 policy and URL category configuration. An attacker could exploit this vulnerability by sending crafted TLS 1.3 connections to an affected device. A successful exploit could allow the attacker to bypass the TLS 1.3 policy and access URLs that are outside the affected device and normally would be dropped.

Una vulnerabilidad en la política Transport Layer Security versión 1.3 (TLS 1.3) con funcionalidad URL category para el Cisco Firepower Threat Defense (FTD) Software, podría permitir a un atacante remoto no autenticado omitir una política TLS versión 1.3 configurada para bloquear el tráfico de una URL específica. La vulnerabilidad es debido a un error lógico con el manejo de la conexión de Snort con la política TLS versión 1.3 y la configuración de URL category. Un atacante podría explotar esta vulnerabilidad mediante el envío de conexiones TLS versión 1.3 diseñadas hacia un dispositivo afectado. Una explotación con éxito podría permitir a un atacante omitir la política TLS versión 1.3 y acceder a las URL que están fuera del dispositivo afectado y que normalmente se descartarían.