Security flaw in Ubuntu login screen could let anyone access your files (OMG! Ubuntu!)

The OMG! Ubuntu! site reportsthat the "guest session" functionality enabled by default on Ubuntudesktops fails to actually confine the guest account. "If you'rerunning a fully up-to-date system you do not need to panic. Canonical hasalready pushed out a update that temporarily disables Ubuntu guest sessionlogins (so if you noticed it was missing, that's why)." See thebug report for details on this issue, which was reported in February.