CVE-2011-0233

WebKit, como se usa en el navegaodor Safari de Apple antes de v5.0.6, permite a atacantes remotos ejecutar código arbitrario o causar una denegación de servicio ( corrupción de memoria y caída de aplicación) a través de un sitio web manipulado, una vulnerabilidad diferente a otros CVEs de WebKit que figuran en APPLE-SA-2011-07-20-1.

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Apple Safari Webkit. 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 library's implementation of a FrameOwner element. When building this tree, the application will create a duplicate reference of an element. By freeing the referenced element, a use-after-free condition can be made to occur which can lead to code execution under the context of the application.