CVE-2015-0817

La implementación asm.js en Mozilla Firefox anterior a 36.0.3, Firefox ESR 31.x anterior a 31.5.2, y SeaMonkey anterior a 2.33.1 no determina correctamente los casos en los que los rangos de comprobación pueden saltase con seguridad durante la compilación JIT y el acceso a la memoria dinámica, lo que permite a atacantes remotos leer o escribir en localizaciones de memoria no intencionadas, y como consecuencia ejecutar código arbitrario, a través de JavaScript manipulado.

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Mozilla Firefox. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.
The specific flaw exists within the handling of heap access bounds checking. A specially crafted typed array can eliminate bounds checks for heap accesses. An attacker can leverage this vulnerability to execute code under the context of the current process.

A flaw was discovered in the implementation of typed array bounds checking in the Javascript just-in-time compilation. If a user were tricked in to opening a specially crafted website, an attacked could exploit this to execute arbitrary code with the privileges of the user invoking Firefox. Mariusz Mlynski discovered a flaw in the processing of SVG format content navigation. If a user were tricked in to opening a specially crafted website, an attacker could exploit this to run arbitrary script in a privileged context. Various other issues were also addressed.