Microsoft Windows MS-DOS Device Name Privilege Escalation Exploit(MS15-038)

An elevation of privilege vulnerability exists when Windows kernel does not properly constrain impersonation levels. The vulnerability occurs because a user can place symlinks for the system drives in the per-login session device map and the kernel will follow them during impersonation. An attacker who successfully exploited this vulnerability may, for example, redirect a call to LoadLibrary, from a system service (when impersonating), to an arbitrary location.