A security issue was discovered in Kubernetes where users may be able to launch containers using images that are restricted by ImagePolicyWebhook when using ephemeral containers. Kubernetes clusters are only affected if the ImagePolicyWebhook admission plugin is used together with ephemeral containers.

This issue affects kube-apiserver. Clusters are impacted by this vulnerability if: 1. The ImagePolicyWebhook admission plugin is used to restrict the use of certain images and 2. Pods using ephemeral containers.

A security issue was discovered in Kubernetes where users may be able to launch containers that bypass the mountable secrets policy enforced by the ServiceAccount admission plugin when using ephemeral containers. The policy ensures pods running with a service account may only reference secrets specified in the service account’s secrets field. Kubernetes clusters are only affected if the ServiceAccount admission plugin and the kubernetes.io/enforce-mountable-secrets annotation are used together with ephemeral containers.

This issue affects kube-apiserver. Clusters are impacted by this vulnerability if:

1. The ServiceAccount admission plugin is used. Most clusters should have this on by default as recommended in https://kubernetes.io/docs/reference/access-authn-authz/admission-controllers/#serviceaccount 2. The kubernetes.io/enforce-mountable-secrets annotation is used by a service account. This annotation is not added by default. 3. Pods using ephemeral containers.