CVE-2023-26484 Information

Description

KubeVirt is a virtual machine management add-on for Kubernetes. In versions 0.59.0 and prior 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.

Reference

https://github.com/kubevirt/kubevirt/issues/9109 https://github.com/kubevirt/kubevirt/security/advisories/GHSA-cp96-jpmq-xrr2