CVE-2011-1266

La implementación Vector Markup Language (VML) en vgx.dll en Microsoft Internet Explorer 6 hasta la 8, no maneja adecuadamente los objetos en memoria, permitiendo a atacantes remotos ejecutar código arbitrario accediento a un objeto que (1) no se ha inicializado correctamente o (2) es eliminado, también conocido como "Vulnerabiliad de Corrupción de memoria VML."

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of 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 vgx.dll while parsing VML objects from the DOM. Specifically, the faulty code exists while handling imagedata parameters during page deconstruction. By dynamically assigning an attribute to an imagedata object the process can be made to access freed memory. Successful exploitation can lead to code execution under the context of the application.