CVE-2024-23638

Squid es un proxy de almacenamiento en caché para la Web. Debido a un error de referencia de puntero caducado, Squid anterior a la versión 6.6 es vulnerable a un ataque de denegación de servicio contra las respuestas de error del Administrador de Caché. Este problema permite que un cliente confiable realice una Denegación de Servicio al generar páginas de error para los informes de Client Manager. Los calamares mayores de 5.0.5 no han sido probados y se debe suponer que son vulnerables. Todos los Squid-5.x hasta 5.9 includa, son vulnerables. Todos los Squid-6.x hasta 6.5 includa, son vulnerables. Este error se solucionó con la versión 6.6 de Squid. Además, los parches que solucionan este problema para las versiones estables se pueden encontrar en los archivos de parches de Squid. Como workaround, evite el acceso al Administrador de caché utilizando el control de acceso principal de Squid: `http_access deny manager`.

A flaw was found in Squid, resulting in a potential denial of service attack targeting Cache Manager error responses. This issue enables a trusted client to execute a denial of service by manipulating the generation of error pages for Client Manager reports.

USN-6728-1 fixed vulnerabilities in Squid. The fix for CVE-2023-5824 caused Squid to crash in certain environments on Ubuntu 20.04 LTS. The problematic fix has been reverted pending further investigation. Joshua Rogers discovered that Squid incorrectly handled collapsed forwarding. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. Joshua Rogers discovered that Squid incorrectly handled certain structural elements. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. Joshua Rogers discovered that Squid incorrectly handled Cache Manager error responses. A remote trusted client can possibly use this issue to cause Squid to crash, resulting in a denial of service. Joshua Rogers discovered that Squid incorrectly handled the HTTP Chunked decoder. A remote attacker could possibly use this issue to cause Squid to stop responding, resulting in a denial of service. Joshua Rogers discovered that Squid incorrectly handled HTTP header parsing. A remote trusted client can possibly use this issue to cause Squid to crash, resulting in a denial of service.