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CVE-2021-20267

Published: 28 May 2021

A flaw was found in openstack-neutron's default Open vSwitch firewall rules. By sending carefully crafted packets, anyone in control of a server instance connected to the virtual switch can impersonate the IPv6 addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations. Only deployments using the Open vSwitch driver are affected. Source: OpenStack project. Versions before openstack-neutron 15.3.3, openstack-neutron 16.3.1 and openstack-neutron 17.1.1 are affected.

Priority

Medium

CVSS 3 base score: 7.1

Status

Package Release Status
neutron
Launchpad, Ubuntu, Debian
Upstream
Released (15.3.3,16.3.1,17.1.1)
Ubuntu 21.10 (Impish Indri) Not vulnerable
(2:18.1.0+git2021072117.147830620f-0ubuntu2)
Ubuntu 21.04 (Hirsute Hippo) Needed

Ubuntu 20.04 LTS (Focal Fossa) Needed

Ubuntu 18.04 LTS (Bionic Beaver) Needed

Ubuntu 16.04 ESM (Xenial Xerus) Needed

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

Notes

AuthorNote
mdeslaur
per upstream Affects: <15.3.3, >=16.0.0 <16.3.1, >=17.0.0 <17.1.1
as of 2021-05-13, patch has been flagged as possibly incomplete
see comment #17 in upstream bug.
addditional patch: https://review.opendev.org/c/openstack/neutron/+/783743

This issue is fixed in (2:16.4.0-0ubuntu2) in focal-updates and
(2:18.1.0-0ubuntu2) in hirsute-updates, but they have not yet
been released to -security.

References

Bugs