An elevation of privilege vulnerability exists when umpo.dll of the Power Service, improperly handles a Registry Restore Key function. An attacker who successfully exploited this vulnerability could delete a targeted registry key leading to an elevated status.
To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take control of an affected system.
The security update addresses the vulnerability by correcting how umpo.dll of the Power Service handles Registry Restore Key requests.