Vulnerability in Windows Kernel Allows Elevation of Privilege (MS07-066)

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This important security update resolves a privately reported vulnerability in the Windows kernel. An attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full administrative rights.

http://www.securiteam.com/windowsntfocus/6S00I0AKKO.html