MitM attack in OpenStack Neutron

1) Insufficient verification of data authenticity

EUVDB-ID: #VU76079

Risk: Medium

CVSSv3.1: 6.2 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20267

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

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

openstack-neutron: 15.0.0 - 17.1.0

External links

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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.