CVE-2018-5133

Si un programa local malicioso cambia la preferencia "app.support.baseURL" para que contenga contenido HTML y script, este contenido no se sanea. Se ejecutará si un usuario carga "chrome://navegador/content/preferences/in-content/preferences.xul" directamente en una pestaña y ejecuta una búsqueda. Esta preferencia almacenada también se ejecuta siempre que un plugin del reproductor de vídeo de EME muestre un mensaje CDM deshabilitado como mensaje de notificación. Esta vulnerabilidad afecta a 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.