Heap-based buffer overflow in DirectShow in Microsoft DirectX, as used in the AVI Filter on Windows 2000 SP4, Windows XP SP2 and SP3, and Windows Server 2003 SP2, and in Quartz on Windows 2000 SP4, Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista Gold, SP1, and SP2, Windows Server 2008 Gold, SP2, and R2, and Windows 7, allows remote attackers to execute arbitrary code via an AVI file with a crafted length field in an unspecified video stream, which is not properly handled by the RLE video decompressor, aka "DirectShow Heap Overflow Vulnerability."