Directory traversal vulnerability in the virStorageBackendFileSystemVolCreate function in storage/storage_backend_fs.c in libvirt, when fine-grained Access Control Lists (ACL) are in effect, allows local users with storage_vol:create ACL but not domain:write permission to write to arbitrary files via a .. (dot dot) in a volume name.
https://www.redhat.com/archives/libvir-list/2015-December/msg00473.html
https://security.gentoo.org/glsa/201612-10
http://www.securityfocus.com/bid/90913
http://security.libvirt.org/2015/0004.html
http://rhn.redhat.com/errata/RHSA-2016-2577.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174404.html
http://libvirt.org/git/?p=libvirt.git%3Ba=commit%3Bh=034e47c338b13a95cf02106a3af912c1c5f818d7