Externally controlled reference to a resource in another sphere in Kubernetes

1) Externally Controlled Reference to a Resource in Another Sphere

EUVDB-ID: #VU97474

Risk: Low

CVSSv3.1: 3.6 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-8561

CWE-ID: CWE-610 - Externally Controlled Reference to a Resource in Another Sphere

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application. A remote attacker that control the responses of MutatingWebhookConfiguration or ValidatingWebhookConfiguration requests is able to redirect kube-apiserver requests to private networks of the apiserver.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Kubernetes: All versions

External links

http://groups.google.com/g/kubernetes-security-announce/c/RV2IhwcrQsY
http://github.com/kubernetes/kubernetes/issues/104720
http://security.netapp.com/advisory/ntap-20211014-0002/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

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