#VU76079 Insufficient verification of data authenticity in openstack-neutron - CVE-2021-20267

Vulnerability identifier: #VU76079

Vulnerability risk: Medium

CVSSv4.0: 5 [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]

CVE-ID: CVE-2021-20267

CWE-ID: CWE-345

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
openstack-neutron
Client/Desktop applications / Other client software

Vendor: Openstack

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 - 15.3.2, 16.0.0 - 16.3.0, 17.0.0 - 17.1.0

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

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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.