#VU57243 Missing Authorization in openstack-neutron - CVE-2021-38598

Vulnerability identifier: #VU57243

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-38598

CWE-ID: CWE-862

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 missing authorization when the linuxbridge driver with ebtables-nft is used on a Netfilter-based platform. A remote attacker in control of a server instance connected to the virtual switch can send specially crafted packets to impersonate the hardware addresses of other systems on the network.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

openstack-neutron: 16.0.0 - 16.4.0, 17.0.0 - 17.1.2

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External links
https://launchpad.net/bugs/1938670

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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