OSSA-2016-007: Nova host data leak through resize/migration

Date:

March 08, 2016

CVE:

CVE-2016-2140

Affects

• Nova: <=2015.1.3, >=12.0.0 <=12.0.2

Description

Matthew Booth from Red Hat reported a vulnerability in Nova instance resize/migration. By overwriting an ephemeral or root disk with a malicious image before requesting a resize, an authenticated user may be able to read arbitrary files from the compute host. Only setups using libvirt driver with raw storage and setting “use_cow_images = False” (not default) are affected.

Errata

The former fix did not take into account the usage of non-disk-image backends and caused a regression for this use-case. This update provides an additional fix for that issue. Moreover, the kilo backport caused a regression in live migration where the disk info file is JSON encoded. This second update provides an additional fix for stable/kilo.

Patches

• https://review.openstack.org/289960 - original (Kilo)

• https://review.openstack.org/290847 - errata (Kilo)

• https://review.openstack.org/294205 - errata#2 (Kilo)

• https://review.openstack.org/289958 - original (Liberty)

• https://review.openstack.org/290843 - errata (Liberty)

• https://review.openstack.org/289957 - original (Mitaka)

• https://review.openstack.org/290715 - errata (Mitaka)

Credits

• Matthew Booth from Red Hat (CVE-2016-2140)

References

• https://bugs.launchpad.net/bugs/1548450

• https://bugs.launchpad.net/bugs/1555287

• https://bugs.launchpad.net/bugs/1558697

• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2140

Notes

• This fix will be included in future 2015.1.4 (kilo) and 12.0.3 (liberty) releases.

OSSA History

• 2016-03-30 - Errata 2

• 2016-03-09 - Errata 1

• 2016-03-08 - Original Version