CVE-2015-7548 – openstack-nova: Unprivileged API user can access host data using instance snapshot

https://notcve.org/view.php?id=CVE-2015-7548

OpenStack Compute (Nova) before 2015.1.3 (kilo) and 12.0.x before 12.0.1 (liberty), when using libvirt to spawn instances and use_cow_images is set to false, allow remote authenticated users to read arbitrary files by overwriting an instance disk with a crafted image and requesting a snapshot. OpenStack Compute (Nova) en versiones anteriores a 2015.1.3 (kilo) y 12.0.x en versiones anteriores a 12.0.1 (liberty), cuando se utiliza libvirt para producir instancias y use_cow_images se establece en false, permite a usuarios remotos autenticados leer archivos arbitrarios sobrescribiendo una instancia de disco con una imagen manipulada y solicitando una instantánea. A flaw was discovered in the OpenStack Compute (nova) snapshot feature when using the libvirt driver. A compute user could overwrite an attached instance disk with a malicious header specifying a backing file, and then request a snapshot, causing a file from the compute host to be leaked. This flaw only affects LVM or Ceph setups, or setups using filesystem storage with "use_cow_images = False". • http://rhn.redhat.com/errata/RHSA-2016-0018.html http://www.securityfocus.com/bid/80176 https://security.openstack.org/ossa/OSSA-2016-001.html https://access.redhat.com/security/cve/CVE-2015-7548 https://bugzilla.redhat.com/show_bug.cgi?id=1290511 • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor •