Vulnerability identifier: #VU57242

Vulnerability risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-40085

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

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

Vendor: Openstack

Description

The vulnerability allows a remote user to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions. A remote user can bypass implemented security restrictions and reconfigure dnsmasq via a crafted extra_dhcp_opts value.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

openstack-neutron: 18.0.0 - 18.1.0, 17.0.0 - 17.2.0, 16.0.0 - 16.4.0

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External links
http://security.openstack.org/ossa/OSSA-2021-005.html
http://launchpad.net/bugs/1939733
http://www.openwall.com/lists/oss-security/2021/08/31/2
http://lists.debian.org/debian-lts-announce/2021/10/msg00005.html
http://www.debian.org/security/2021/dsa-4983

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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 Internet.

Is there known malware, which exploits this vulnerability?

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