CVE-2011-1963

Microsoft Internet Explorer 7 hasta 9 no maneja adecuadamente objetos en memoria, lo que permite a atacantes remotos ejecutar código de su elección accediendo a objetos que (1) no fueron inicializados correctamente o (2) es eliminado, también conocido como "vulnerabilidad XSLT Memory Corruption".

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 exists within the part of the application that is responsible for reloading the markup for a root document object. During reloading of the markup, the application will dispatch a notification whilst retaining a reference to the object in the function's context. This can allow an event callback to tamper with the root document object. Usage of this malformed object can then be used to achieve code execution under the context of the application.