An improper handling of objects in memory in Windows kernel-mode driver was found in Microsoft Windows. By exploiting this vulnerability malicious users can gain privileges. This vulnerability can be exploited remotely via a specially designed application by a malicious user who has logged on to the system.
Windows 7 Service Pack 1
Windows Server 2008 Service Pack 2
Windows Server 2008 R2 Service Pack 1
Install necessary updates from the KB section, that are listed in your Windows Update (Windows Update usually can be accessed from the Control Panel)