Race condition in the SPICE (aka spice-xpi) plug-in 2.2 for Firefox allows local users to obtain sensitive information, and conduct man-in-the-middle attacks, by providing a UNIX socket for communication between this plug-in and the client (aka qspice-client) in qspice 0.3.0, and then accessing this socket.
https://bugzilla.redhat.com/show_bug.cgi?id=620350
http://www.vupen.com/english/advisories/2010/2181
http://www.securityfocus.com/bid/42711
http://www.redhat.com/support/errata/RHSA-2010-0651.html
http://www.redhat.com/support/errata/RHSA-2010-0632.html