SB2021052812 - MitM attack in OpenStack Neutron

Description

This security bulletin contains information about 1 vulnerability.

1) Insufficient verification of data authenticity (CVE-ID: CVE-2021-20267)

CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity

CVSSv4: 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/E:U/U:Green

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.

Remediation

Install update from vendor's website.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1934330
• https://security.openstack.org/ossa/OSSA-2021-001.html