GNOME Display Manager (gdm) 3.4.1 and earlier, when disable-user-list is set to true, allows local users to cause a denial of service (unable to login) by pressing the cancel button after entering a user name.Referenceshttp://www.openwall.com/lists/oss-security/2014/01/07/10https://bugzilla.gnome.org/show_bug.cgi?id=704284https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=683338http://www.openwall.com/lists/oss-security/2014/01/07/16https://bugzilla.redhat.com/show_bug.cgi?id=1050745
