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)stretch (security), stretch2:9.1.1-3+deb9u1vulnerable
buster2:13.0.2-15vulnerable
bullseye, sid2:17.1.1-6fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
neutronsource(unstable)2:17.1.1-5985104

Notes

[buster] - neutron <no-dsa> (Minor issue)
[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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