Sign extension vulnerability in the createBrushIndirect function in the GDI library (gdi32.dll) in Microsoft Windows XP, Server 2003, and possibly other versions, allows user-assisted attackers to cause a denial of service (application crash) via a crafted WMF file.

Microsoft Windows Server 2003, when time restrictions are in effect for user accounts, generates different error messages for failed login attempts with a valid user name than for those with an invalid user name, which allows context-dependent attackers to determine valid Active Directory account names.

\Device\NdisTapi (NDISTAPI.sys) in Microsoft Windows XP SP2 and 2003 SP1 uses weak permissions, which allows local users to write to the device and cause a denial of service, as demonstrated by using an IRQL to acquire a spinlock on paged memory via the NdisTapiDispatch function.