Heap-based buffer overflow in an API in GDI in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP1 and SP2, Vista Gold and SP1, and Server 2008 allows context-dependent attackers to cause a denial of service or execute arbitrary code via a WMF file with a malformed file-size parameter, which would not be properly handled by a third-party application that uses this API for a copy operation, aka "GDI Heap Overflow Vulnerability."