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CVE-2020-17376

Published: 26 August 2020

An issue was discovered in Guest.migrate in virt/libvirt/guest.py in OpenStack Nova before 19.3.1, 20.x before 20.3.1, and 21.0.0. By performing a soft reboot of an instance that has previously undergone live migration, a user may gain access to destination host devices that share the same paths as host devices previously referenced by the virtual machine on the source host. This can include block devices that map to different Cinder volumes at the destination than at the source. Only deployments allowing host-based connections (for instance, root and ephemeral devices) are affected.

Notes

AuthorNote
mdeslaur
This is only an issue when libvirt is 1.3.4 and later. On
Xenial, libvirt is 1.3.1 and is not vulnerable.
This is fixed in focal-updates but is not yet in -security

Priority

Low

Cvss 3 Severity Score

8.3

Score breakdown

Status

Package Release Status
nova
Launchpad, Ubuntu, Debian
impish Not vulnerable
(3:23.0.0-0ubuntu1)
upstream Needs triage

groovy Ignored
(end of life)
xenial Not vulnerable
(libvirt is earlier than 1.3.4)
bionic
Released (2:17.0.13-0ubuntu5.3)
focal
Released (2:21.2.4-0ubuntu2.1)
hirsute Not vulnerable
(3:23.0.0-0ubuntu1)
jammy Not vulnerable
(3:23.0.0-0ubuntu1)
kinetic Not vulnerable
(3:23.0.0-0ubuntu1)
trusty Does not exist

Patches:
upstream: https://review.opendev.org/747978 (Pike)
upstream: https://review.opendev.org/747976 (Queens)
upstream: https://review.opendev.org/747975 (Rocky)
upstream: https://review.opendev.org/747974 (Stein)
upstream: https://review.opendev.org/747973 (Train)
upstream: https://review.opendev.org/747972 (Ussuri)
upstream: https://review.opendev.org/747969 (Victoria)

Severity score breakdown

Parameter Value
Base score 8.3
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact Low
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L