Red Hat libvirt 0.2.0 through 0.8.2 creates iptables rules with improper mappings of privileged source ports, which allows guest OS users to bypass intended access restrictions by leveraging IP address and source-port values, as demonstrated by copying and deleting an NFS directory tree.
Multiple methods in libvirt 0.3.2 through 0.5.1 do not check if a connection is read-only, which allows local users to bypass intended access restrictions and perform administrative actions.