Incorrect Authorization

Summary

KubeVirt is a virtual machine management add-on for Kubernetes. In All versions, if a malicious user has taken over a Kubernetes node where "virt-handler" (the KubeVirt node-daemon) is running, the "virt-handler" service account can be used to modify all node specs. This can be misused to lure-in system-level-privileged components which can, for instance, read all secrets on the cluster, or can exec into pods on other nodes. This way, a compromised node can be used to elevate privileges beyond the node until potentially having full privileged access to the whole cluster. The simplest way to exploit this, once a user could compromise a specific node, is to set with the "virt-handler" service account all other nodes to unschedulable and simply wait until system-critical components with high privileges appear on its node. No patches are available as of time of publication. As a workaround, gatekeeper users can add a webhook which will block the "virt-handler" service account to modify the spec of a node.