The Graphics Device Interface (GDI) in win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP2 and SP3 Windows Server 2003 SP2 Windows Vista SP2 Windows Server 2008 SP2 R2 and R2 SP1 and Windows 7 Gold and SP1 does not properly validate user-mode input which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via crafted data as demonstrated by a large height attribute of an IFRAME element rendered by Safari aka \GDI Access Violation Vulnerability.\