[OSSA-2021-001] Neutron: Anti-spoofing bypass for Open vSwitch networks (CVE-2021-20267)

                							

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[OSSA-2021-001] Neutron: Anti-spoofing bypass for Open vSwitch networks (CVE-2021-20267)

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From: Jeremy Stanley &lt;fungi () yuggoth org&gt;

Date: Mon, 12 Jul 2021 19:16:14 +0000

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=============================================================
OSSA-2021-001: Anti-spoofing bypass for Open vSwitch networks
=============================================================

:Date: July 12, 2021
:CVE: CVE-2021-20267

Affects
~~~~~~~
- Neutron: &lt;16.3.3, &gt;=17.0.0 &lt;17.1.3, =18.0.0

Description
~~~~~~~~~~~
David Sinquin with Gandi.net reported a vulnerability in 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.

Patches
~~~~~~~
- https://review.opendev.org/777873 (Queens)
- https://review.opendev.org/791470 (Queens)
- https://review.opendev.org/777786 (Rocky)
- https://review.opendev.org/791469 (Rocky)
- https://review.opendev.org/777872 (Stein)
- https://review.opendev.org/791500 (Stein)
- https://review.opendev.org/777785 (Train)
- https://review.opendev.org/791468 (Train)
- https://review.opendev.org/777784 (Ussuri)
- https://review.opendev.org/791467 (Ussuri)
- https://review.opendev.org/777783 (Victoria)
- https://review.opendev.org/791465 (Victoria)
- https://review.opendev.org/776599 (Wallaby)
- https://review.opendev.org/791464 (Wallaby)
- https://review.opendev.org/783743 (Xena)

Credits
~~~~~~~
- David Sinquin from Gandi.net (CVE-2021-20267)

References
~~~~~~~~~~
- https://launchpad.net/bugs/1902917
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20267

Notes
~~~~~
- The stable/train, stable/stein, stable/rocky, and stable/queens
  branches are under extended maintenance and will receive no new
  point releases, but patches for them are provided as a courtesy.

-- 
Jeremy Stanley
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[OSSA-2021-001] Neutron: Anti-spoofing bypass for Open vSwitch networks (CVE-2021-20267) Jeremy Stanley (Jul 12)

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