Privilege escalation via Win32k null pointer dereference

Null pointer dereference in Microsoft Win32k on affected Windows Server 2008 builds allows local users to gain elevated privileges. The defect is identified only at the Win32k component level; Microsoft has not published the affected function or the operation that dereferences the null pointer. Exploitation requires local low-privileged access and can compromise confidentiality, integrity, and availability under the elevated context.