CVE-2008-1434

Una vulnerabilidad de uso de la memoria previamente liberada en Microsoft Word en Office 2000 y XP SP3, 2003 SP2 y SP3, y 2007 Office System SP1 y anteriores, permite a atacantes remotos ejecutar código arbitrario por medio de un documento HTML con un gran número de Cascading Style Sheets (CSS), relacionado con un "memory handling error" que desencadena una corrupción de memoria.

Remote exploitation of a memory corruption vulnerability in Microsoft Corp.'s Word could allow attackers to execute arbitrary code with the privileges of the logged in user. This vulnerability exists in the way Word handles CSS rules in an HTML document. When the number of CSS selectors is above some specific amount, an unspecified object will be corrupted causing Word to access a memory region that has already been freed. iDefense has confirmed fully patched Microsoft Word 2003 SP2, Microsoft Word XP SP3, Microsoft Word 2000 SP3 are vulnerable. Microsoft Word 2003 SP3 and Microsoft Word 2007 do not appear to be affected. Microsoft reports that all supported versions of Word, Word Viewer, and Outlook 2007 are vulnerable.