CVE-2010-1121

Firefox de Mozilla versiones 3.6.x anteriores a 3.6.3, no administra apropiadamente los ámbitos de los nodos DOM que son movidos de un documento a otro, lo que permite a los atacantes remotos conducir ataques de uso de memoria previamente liberada y ejecutar código arbitrario por medio de vectores no especificados que implican una interacción inapropiada con garbage collection, como es demostrado por Nils durante una competencia de Pwn2Own en CanSecWest 2010.

This vulnerability allows remote attackers to bypass specific script execution enforcements on vulnerable installations of Mozilla Firefox. User interaction is required to exploit this vulnerability in that the target must visit a malicious page.
The specific flaw exists when moving DOM nodes in between documents with a specific timing while triggering garbage collection. If timed correctly Firefox will incorrectly reference a previously freed object which can be leveraged by an attacker to execute arbitrary code under the context of the current user.