===================================================== OSSA-2018-001: Raw underlying encrypted volume access =====================================================
:Date: April 20, 2018 :CVE: CVE-2017-18191
Affects ~~~~~~~ - Nova: >=15.0.0 <=15.1.0, >=16.0.0 <=16.1.1
Description ~~~~~~~~~~~ Lee Yarwood (Red Hat) reported a vulnerability in Nova encrypted volumes handling. By detaching and reattaching an encrypted volume an attacker may access the underlying raw volume and corrupt the LUKS header resuling in a denial of service attack on the compute host. All Nova setups supporting encrypted volumes are affected.
Patches ~~~~~~~ - https://review.openstack.org/561604 (Ocata) - https://review.openstack.org/543569 (Pike) - https://review.openstack.org/460243 (Queens)
Credits ~~~~~~~ - Lee Yarwood from Red Hat (CVE-2017-18191)
References ~~~~~~~~~~ - https://launchpad.net/bugs/1739593 - http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-18191
Notes ~~~~~ - Pike and Ocata patches disable encrypted volume swapping, this feature is now only supported in Nova version >= 17.0.0.
-- Tristan Cacqueray OpenStack Vulnerability Management Team