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

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

Severity
4
CVSS
(AV:N/AC:L/Au:S/C:P/I:N/A:N)
Published
09/20/2021
Created
03/11/2022
Added
03/10/2022
Modified
03/28/2022

Description

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.

Solution(s)

  • kubernetes-upgrade-1_20_11
  • kubernetes-upgrade-1_21_5
  • kubernetes-upgrade-1_22_2

References

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