Vulnerable Systems:
* Windows XP
* Windows Server 2003
* Windows Vista
* Windows Server 2008
* Windows 7
This security update is rated Important for all supported editions of Windows XP, Windows Server 2003, Windows Vista, Windows Server 2008, and Windows 7. Supported editions of Windows XP and Windows Server 2003 are only affected if they have previously installed the non-security update described in KB968389.
The security update addresses the vulnerability by implementing additional validation of specific value sets used in the authentication process.