The QuickTime Movie Parser Filter in quartz.dll in DirectShow in Microsoft DirectX 7.0 through 9.0c on Windows 2000 SP4, Windows XP SP2 and SP3, and Windows Server 2003 SP2 does not properly validate unspecified size fields in QuickTime media files, which allows remote attackers to execute arbitrary code via a crafted file, aka "DirectX Size Validation Vulnerability."