The guestfish command in libguestfs 1.20.12, 1.22.7, and earlier, when using the --remote or --listen option, does not properly check the ownership of /tmp/.guestfish-$UID/ when creating a temporary socket file in this directory, which allows local users to write to the socket and execute arbitrary commands by creating /tmp/.guestfish-$UID/ in advance.
https://www.redhat.com/archives/libguestfs/2013-October/msg00031.html
https://bugzilla.redhat.com/show_bug.cgi?id=1016960
http://secunia.com/advisories/55813
http://rhn.redhat.com/errata/RHSA-2013-1536.html
http://lists.opensuse.org/opensuse-security-announce/2013-11/msg00001.html