CVE-2015-0820

Mozilla Firefox anterior a 36.0 no restringe correctamente las transiciones de objetos JavaScript de un estado no existente a un estado extensible, lo que permite a atacantes remotos evadir el mecanismo de protección del sandbox de Caja Compiler o un mecanismo de protección de sandbox de Secure EcmaScript a través de un sitio web manipulado.

USN-2505-1 fixed vulnerabilities in Firefox. This update removed the deprecated "-remote" command-line switch that some older software still depends on. This update fixes the problem. Matthew Noorenberghe discovered that whitelisted Mozilla domains could make UITour API calls from background tabs. If one of these domains were compromised and open in a background tab, an attacker could potentially exploit this to conduct clickjacking attacks. Jan de Mooij discovered an issue that affects content using the Caja Compiler. If web content loads specially crafted code, this could be used to bypass sandboxing security measures provided by Caja. Armin Razmdjou discovered that opening hyperlinks with specific mouse and key combinations could allow a Chrome privileged URL to be opened without context restrictions being preserved. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit this to bypass security restrictions. Various other issues were also addressed.