CVE-2020-8561: Webhook redirect in kube-apiserver
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.
Affected Software
Event History
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.