CVE-2021-20267

NameCVE-2021-20267
DescriptionA 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium
Debian Bugs985104

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
neutron (PTS)jessie2014.1.3-12vulnerable
stretch2:9.1.1-3+deb9u1vulnerable
stretch (security)2:9.1.1-3+deb9u2vulnerable
buster2:13.0.2-15vulnerable
buster (security)2:13.0.7+git.2021.09.27.bace3d1890-0+deb10u1fixed
bullseye2:17.1.1-6fixed
bullseye (security)2:17.2.1-0+deb11u1fixed
sid, bookworm2:19.0.0-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
neutronsourcejessie(unfixed)end-of-life
neutronsourcebuster2:13.0.7+git.2021.09.27.bace3d1890-0+deb10u1
neutronsource(unstable)2:17.1.1-5985104

Notes

[stretch] - neutron <no-dsa> (Minor issue)
https://bugs.launchpad.net/neutron/+bug/1902917
https://review.opendev.org/c/openstack/neutron/+/776599
Followup: https://review.opendev.org/c/openstack/neutron/+/783743
https://www.openwall.com/lists/oss-security/2021/07/12/2

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