Containerd is a container runtime available as a daemon for Linux and Windows. A bug was found in containerd prior to versions 1.6.1, 1.5.10, and 1.4.12 where containers launched through containerd’s CRI implementation on Linux with a specially-crafted image configuration could gain access to read-only copies of arbitrary files and directories on the host. This may bypass any policy-based enforcement on container setup (including a Kubernetes Pod Security Policy) and expose potentially sensitive information. This bug was fixed in containerd versions 1.6.1, 1.5.10, and 1.4.12. Users should update to these versions to resolve the issue.
Checking containerd version to see if it is a vulnerable version (where the container runtime is containerd)
Patch containerd to 1.6.1, 1.5.10, 1.4.12 or above
apiVersion: v1 kind: Node metadata: spec: podCIDR: 10.0.6.0/24 podCIDRs: - 10.0.6.0/24 status: nodeInfo: architecture: amd64 containerRuntimeVersion: containerd://1.4.11 kernelVersion: 5.4.170+ operatingSystem: linux
Updated 11 days ago