mrxdav.sys (aka the WebDAV driver) in the kernel-mode drivers in Microsoft Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT Gold and 8.1 allows local users to bypass an impersonation protection mechanism, and obtain privileges for redirection of WebDAV requests, via a crafted application, aka "WebDAV Elevation of Privilege Vulnerability."