CVE-2013-0756

Vulnerabilidad en la gestión de recursos en la función obj_toSource en Mozilla Firefox anterior a v18.0, Firefox ESR 17.x anterior a v17.0.2, Thunderbird anterior a v17.0.2, Thunderbird ESR v17.x anterior a v17.0.2, y SeaMonkey anterior a v2.15 permite a atacantes remotos ejecutar código arbitrario a través de una página web manipulada haciendo referencia a objetos de JavaScript proxy que no están bien manejados durante la recolección de basura.

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 obj_toSource function of jsobj.cpp. When crafting a javascript proxy object, an attacker can specially craft Handler methods to cause a use-after-free vulnerability. When the proxy object is successfully created, a call to the toSource function will lead to a dangling pointer condition. An attacker can leverage this vulnerability to execute code under the context of the running process.