The (1) GlusterFS and (2) Linux Smbfs drivers in OpenStack Cinder before 2014.1.3 allows remote authenticated users to obtain file data from the Cinder-volume host by cloning and attaching a volume with a crafted qcow2 header.
https://bugs.launchpad.net/cinder/+bug/1350504
http://www.ubuntu.com/usn/USN-2405-1
http://www.securityfocus.com/bid/70221
http://seclists.org/oss-sec/2014/q4/78