CVE-2017-5454

Mecanismo para omitir las protecciones de acceso al sistema de archivos en el sandbox para emplear el picker de archivos para acceder a diferentes archivos que los seleccionados en el picker mediante el uso de rutas relativas. Esto permite acceso de solo lectura en el sistema de archivos local. La vulnerabilidad afecta a Thunderbird en versiones anteriores a la 52.1, Firefox ESR en versiones anteriores a la 52.1 y Firefox en versiones anteriores a la 53.

USN-3260-1 fixed vulnerabilities in Firefox. The update caused the date picker panel and form validation errors to close immediately on opening. 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 read uninitialized memory, obtain sensitive information, spoof the addressbar contents or other UI elements, escape the sandbox to read local files, conduct cross-site scripting attacks, cause a denial of service via application crash, or execute arbitrary code. A flaw was discovered in the DRBG number generation in NSS. If an attacker were able to perform a man-in-the-middle attack, this flaw could potentially be exploited to view sensitive information. Various other issues were also addressed.