Denial of service in OpenStack Neutron

1) Resource exhaustion

EUVDB-ID: #VU59320

Risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-40797

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources when processing API calls to nonexistent controllers. A remote authenticated user can trigger resource exhaustion by sending multiple API calls and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

openstack-neutron: 16.0.0 - 18.1.0

CPE2.3

• cpe:2.3:a:openstack:openstack-neutron:16.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:openstack:openstack-neutron:17.2.0:*:*:*:*:*:*:*
• cpe:2.3:a:openstack:openstack-neutron:18.1.0:*:*:*:*:*:*:*

External links

https://launchpad.net/bugs/1942179
https://security.openstack.org/ossa/OSSA-2021-006.html
https://www.openwall.com/lists/oss-security/2021/09/09/2

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.