#VU57242 Improper access control in openstack-neutron - CVE-2021-40085


Vulnerability identifier: #VU57242

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

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


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


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.


Latest bulletins with this vulnerability