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.
Notes
| Author | Note |
|---|---|
| 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 was fixed in (2:16.4.0-0ubuntu2) in focal-updates and (2:18.1.0-0ubuntu2) in hirsute-updates, and was later released to -security. |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
neutron Launchpad, Ubuntu, Debian |
bionic |
Released
(2:12.1.1-0ubuntu8.1)
|
| focal |
Released
(2:16.4.2-0ubuntu6.2)
|
|
| groovy |
Ignored
(reached end-of-life)
|
|
| hirsute |
Ignored
(reached end-of-life)
|
|
| impish |
Not vulnerable
(2:18.1.0+git2021072117.147830620f-0ubuntu2)
|
|
| jammy |
Not vulnerable
(2:18.1.0+git2021072117.147830620f-0ubuntu2)
|
|
| kinetic |
Not vulnerable
(2:18.1.0+git2021072117.147830620f-0ubuntu2)
|
|
| lunar |
Not vulnerable
(2:18.1.0+git2021072117.147830620f-0ubuntu2)
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(15.3.3,16.3.1,17.1.1)
|
|
| xenial |
Needed
|
|
|
Patches: upstream: https://opendev.org/openstack/neutron/commit/580e57b2ad07d268067b2043fd1f5b33bd8f785e (ussuri) upstream: https://opendev.org/openstack/neutron/commit/ac474307d3a800c30ecbabf0f47de931ad310339 (ussuri) upstream: https://opendev.org/openstack/neutron/commit/7b1f0dd1aed68f98b5472c2dfa821e9338f286f0 (queens) upstream: https://opendev.org/openstack/neutron/commit/ccea0021bc49eefde9af6568942159b52588daae (queens) |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.1 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H |