CVE-2023-46728

Squid es un proxy de almacenamiento en caché para la Web que admite HTTP, HTTPS, FTP y más. Debido a un bug de desreferencia de NULL pointer, Squid es vulnerable a un ataque de Denegación de Servicio contra la puerta de enlace Gopher de Squid. El protocolo Gopher siempre está disponible y habilitado en Squid antes de Squid 6.0.1. Es posible recibir respuestas que desencadenen este error desde cualquier servidor Gopher, incluso aquellos sin intenciones maliciosas. La compatibilidad con Gopher se eliminó en la versión 6.0.1 de Squid. Se recomienda a los usuarios que actualicen. Los usuarios que no puedan actualizar deben rechazar todas las solicitudes de URL de Gopher.

Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a NULL pointer dereference bug Squid is vulnerable to a Denial of Service attack against Squid's Gopher gateway. The gopher protocol is always available and enabled in Squid. This issue may lead to a remote denial of service via gopher URL requests.

Joshua Rogers discovered that Squid incorrectly handled validating certain SSL certificates. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 23.04, and Ubuntu 23.10. Joshua Rogers discovered that Squid incorrectly handled the Gopher protocol. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. Gopher support has been disabled in this update. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, and Ubuntu 23.04.