CVE-2013-1306

Vulnerabilidad de tipo "usar después de liberar" en Microsoft Internet Explorer v8 hasta v9 permite a atacantes remotos ejecutar código de su elección mediante un sitio web malintencionado que genera el acceso a un objeto eliminado, también conocido como "Vulnerabilidad de usar después de liberar en Internet Explorer", una vulnerabilidad diferente a CVE-2013-1313.

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 issue is due to the way anchor elements are handled. When parsing occurs, the process can be made to delete an object resulting is 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.

Microsoft Internet Explorer version 9 suffers from an MSHTML CDispNode::InsertSiblingNode use-after-free vulnerability.