CVE-2021-20267
First published: Wed Mar 03 2021(Updated: )
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.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| OpenStack Neutron | <16.3.3 | |
| OpenStack Neutron | >=17.0.0<17.1.3 | |
| OpenStack Neutron | =18.0.0 | |
| Redhat Openstack Platform | =10.0 | |
| Redhat Openstack Platform | =13.0 | |
| Redhat Openstack Platform | =16.1 | |
| Redhat Openstack Platform | =16.2 | |
| pip/neutron | >=17.0.0<17.1.1 | 17.1.1 |
| pip/neutron | <15.3.3 | 15.3.3 |
| pip/neutron | >=16.0.0<16.3.1 | 16.3.1 |
| redhat/neutron | <15.3.3 | 15.3.3 |
| redhat/neutron | <16.3.1 | 16.3.1 |
| redhat/neutron | <17.1.1 | 17.1.1 |
| <16.3.3 | ||
| >=17.0.0<17.1.3 | ||
| =18.0.0 | ||
| =10.0 | ||
| =13.0 | ||
| =16.1 | ||
| =16.2 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1934330
- https://security.openstack.org/ossa/OSSA-2021-001.html
- https://bugs.launchpad.net/neutron/+bug/1902917
- https://review.opendev.org/c/openstack/neutron/+/776599
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1345892
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1934331
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1962090
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1962091
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1962092
- https://nvd.nist.gov/vuln/detail/CVE-2021-20267
- https://github.com/advisories/GHSA-w8hx-f868-pvch (Advisory)
- https://github.com/pypa/advisory-database/tree/main/vulns/neutron/PYSEC-2021-136.yaml
Frequently Asked Questions
What is CVE-2021-20267?
CVE-2021-20267 is a vulnerability in openstack-neutron's default Open vSwitch firewall rules.
How can the vulnerability be exploited?
The vulnerability can be exploited by sending carefully crafted packets to impersonate the IPv6 addresses of other systems on the network.
What is the severity of CVE-2021-20267?
CVE-2021-20267 has a severity score of 7.1, which is considered high.
Which software versions are affected by CVE-2021-20267?
OpenStack Neutron versions up to and including 16.3.3, versions between 17.0.0 and 17.1.3, and version 18.0.0 are affected. Red Hat Openstack Platform versions 10.0, 13.0, 16.1, and 16.2 are also affected.
How can I fix CVE-2021-20267?
To fix CVE-2021-20267, update to OpenStack Neutron version 16.3.3, versions between 17.0.0 and 17.1.3, or version 18.0.0. For Red Hat Openstack Platform, update to versions 10.0, 13.0, 16.1, or 16.2.
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