CVE-2013-1312

Vulnerabilidad de tipo "usar después de liberar" en Microsoft Internet Explorer v9 y v10 permite a atacantes remotos ejecutar código de su elección mediante un sitio web malintencionado que lanza el acceso a un objeto eliminado, también conocido como "Vulnerabilidad de usar después de liberar en Internet Explorer"

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Internet Explorer. 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 is due to the way mshtml handles a CDOMTextNode. When using a selection to get focusNode, the process can be made to create a CDOMTextNode and later delete this CDOMTextNode resulting in a dangling pointer. The process can be later forced to reuse this pointer resulting in a use-after-free condition. An attacker can leverage this situation to execute code under the context of the user running the browser.