What is CVE-2020-8561?

CVE-2020-8561 is a security issue discovered in Kubernetes that allows actors to redirect kube-apiserver requests to private networks.

What is the severity of CVE-2020-8561?

The severity of CVE-2020-8561 is medium with a CVSS score of 4.1.

Which software versions are affected by CVE-2020-8561?

Kubernetes versions 1.20.11, 1.21.5, and 1.22.2 are affected by CVE-2020-8561.

How can I fix CVE-2020-8561?

To fix CVE-2020-8561, update your Kubernetes version to a patched version as mentioned in the official references.

Vulnerability/
CVE-2020-8561

medium

4.1

CWE

610 441

20/9/2021

16/9/2024

CVE-2020-8561: Webhook redirect in kube-apiserver

First published: Mon Sep 20 2021(Updated: )

A security issue was discovered in Kubernetes where actors that control the responses of MutatingWebhookConfiguration or ValidatingWebhookConfiguration requests are able to redirect kube-apiserver requests to private networks of the apiserver. If that user can view kube-apiserver logs when the log level is set to 10, they can view the redirected responses and headers in the logs.

Credit: jordan@liggitt.net

Affected Software	Affected Version	How to fix
Kubernetes Kubernetes	=1.20.11
Kubernetes Kubernetes	=1.21.5
Kubernetes Kubernetes	=1.22.2

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Frequently Asked Questions

What is CVE-2020-8561?
CVE-2020-8561 is a security issue discovered in Kubernetes that allows actors to redirect kube-apiserver requests to private networks.
What is the severity of CVE-2020-8561?
The severity of CVE-2020-8561 is medium with a CVSS score of 4.1.
Which software versions are affected by CVE-2020-8561?
Kubernetes versions 1.20.11, 1.21.5, and 1.22.2 are affected by CVE-2020-8561.
How can actors exploit CVE-2020-8561?
Actors can exploit CVE-2020-8561 by controlling the responses of MutatingWebhookConfiguration or ValidatingWebhookConfiguration requests to redirect kube-apiserver requests.
How can I fix CVE-2020-8561?
To fix CVE-2020-8561, update your Kubernetes version to a patched version as mentioned in the official references.

collector/nvd-index
agent/weakness
agent/softwarecombine
agent/type
agent/references
agent/severity
agent/title
agent/author
agent/description
agent/tags
collector/mitre-cve
source/MITRE
agent/last-modified-date
agent/event
agent/first-publish-date
agent/source
vendor/kubernetes
canonical/kubernetes kubernetes
version/kubernetes kubernetes/1.20.11
version/kubernetes kubernetes/1.21.5
version/kubernetes kubernetes/1.22.2

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