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Kubernetes: CVE-2021-25735: Validating Admission Webhook does not observe some previous fields

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Kubernetes: CVE-2021-25735: Validating Admission Webhook does not observe some previous fields

Severity
6
CVSS
(AV:N/AC:L/Au:S/C:N/I:P/A:P)
Published
09/06/2021
Created
03/11/2022
Added
03/10/2022
Modified
03/28/2022

Description

A security issue was discovered in kube-apiserver that could allow node updates to bypass a Validating Admission Webhook. Clusters are only affected by this vulnerability if they run a Validating Admission Webhook for Nodes that denies admission based at least partially on the old state of the Node object. Validating Admission Webhook does not observe some previous fields.

Solution(s)

  • kubernetes-upgrade-1_18_18
  • kubernetes-upgrade-1_19_10
  • kubernetes-upgrade-1_20_6

References

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