[OSSA-2018-001] Raw underlying encrypted volume access (CVE-2017-18191)

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[OSSA-2018-001] Raw underlying encrypted volume access (CVE-2017-18191)

Tristan Cacqueray-2
=====================================================
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

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