CVE-2011-3248

Error de signo de enteros en Apple QuickTime anterior a v7.7.1 permite a atacantes remotos ejecutar código arbitrario o causar una denegación de servicio (caída de aplicación) a través de una tabla de fuentes en un archivo de película QuickTime.

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Apple Quicktime. 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 how the application parses font names embedded within an atom. When parsing the font name, the application will treat a length from the file as a signed value when copying font data into a buffer. Due to an unsigned promotion, this can be used to write outside the bounds of a buffer which can lead to code execution under the context of the application.