CVE-2020-17376

Publication date 26 August 2020

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
nova	22.10 kinetic	Not affected
	22.04 LTS jammy	Not affected
	21.10 impish	Not affected
	21.04 hirsute	Not affected
	20.10 groovy	Ignored end of life
	20.04 LTS focal	Fixed 2:21.2.4-0ubuntu2.1
	18.04 LTS bionic	Fixed 2:17.0.13-0ubuntu5.3
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not in release

Notes

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

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
nova	Upstream: https://review.opendev.org/747978 Upstream: https://review.opendev.org/747976 Upstream: https://review.opendev.org/747975 Upstream: https://review.opendev.org/747974 Upstream: https://review.opendev.org/747973 Upstream: https://review.opendev.org/747972 Upstream: https://review.opendev.org/747969

Severity score breakdown

Parameter	Value
Base score	8.3 · High
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

References

Related Ubuntu Security Notices (USN)

USN-5866-1
Nova vulnerabilities
13 February 2023