Insufficient verification of data authenticity in openstack-neutron - CVE-2021-20267
Published: May 12, 2023
Vulnerability identifier: #VU76079
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-20267
CWE-ID: CWE-345
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform MitM attack.
The vulnerability exists due to insufficient verification of data authenticity when processing IPv6 packets in openstack-neutron's default Open vSwitch firewall rules. A remote attacker in control of a server instance connected to the virtual switch can
impersonate the IPv6 addresses of other systems on the network and intercept traffic or perform a denial of service (DoS) attack.
Affected software
openstack-neutron
Ubuntu
python-neutron (Ubuntu package)
python3-neutron (Ubuntu package)
Ubuntu
python-neutron (Ubuntu package)
python3-neutron (Ubuntu package)
How to mitigate CVE-2021-20267
Install updates from vendor's website.
openstack-neutron - addressed in versions 15.3.3, 16.3.1, 17.1.1
python-neutron (Ubuntu package) - update to 2:12.1.1-0ubuntu8.1
python3-neutron (Ubuntu package) - addressed in versions 2:16.4.2-0ubuntu6.2, 2:20.3.0-0ubuntu1.1
python-neutron (Ubuntu package) - update to 2:12.1.1-0ubuntu8.1
python3-neutron (Ubuntu package) - addressed in versions 2:16.4.2-0ubuntu6.2, 2:20.3.0-0ubuntu1.1