Red Hat Security Advisory 2014-1788-01 – OpenStack Block Storage manages block storage mounting and the presentation of such mounted block storage to instances. The backend physical storage can consist of local disks, or Fiber Channel, iSCSI, and NFS mounts attached to Compute nodes. In addition, Block Storage supports volume backups, and snapshots for temporary save and restore operations. Programatic management is available via Block Storage’s API. A flaw was found in the GlusterFS and Linux smbfs drivers for OpenStack Block Storage. A remote attacker could use this flaw to disclose an arbitrary file from the cinder-volume host to a virtual instance by cloning and attaching a volume with a malicious qcow2 header.