CVE-2018-5131

Bajo ciertas circunstancias, la API "fetch()" puede devolver copias locales transitorias de recursos que se enviaron con una cabecera de caché "no-store" o "no-cache" en lugar de descargar una copia de la red, que es lo recomendado. Esto puede dar lugar a que los usuarios puedan acceder a los datos almacenados previamente y almacenados en la caché local de un sitio web si comparten un perfil común durante la navegación. Esta vulnerabilidad afecta a las versiones anteriores a la 52.7 de Firefox ESR y las versiones anteriores a la 59 de Firefox.

USN-3596-1 fixed vulnerabilities in Firefox. The update caused an issue where it was not possible to customize the toolbars when running Firefox in Unity. This update fixes the problem. Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service via application crash or opening new tabs, escape the sandbox, bypass same-origin restrictions, obtain sensitive information, confuse the user with misleading permission requests, or execute arbitrary code. It was discovered that the fetch API could incorrectly return cached copies of no-store/no-cache resources in some circumstances. A local attacker could potentially exploit this to obtain sensitive information in environments where multiple users share a common profile. Various other issues were also addressed.