Race condition in the SPICE (aka spice-activex) plug-in for Internet Explorer in Red Hat Enterprise Virtualization (RHEV) Manager before 2.2.4 allows local users to create a certain named pipe, and consequently gain privileges, via vectors involving knowledge of the name of this named pipe, in conjunction with use of the ImpersonateNamedPipeClient function.
https://rhn.redhat.com/errata/RHSA-2010-0818.html
https://bugzilla.redhat.com/show_bug.cgi?id=620355