C-0203 - Minimize the admission of HostPath volumes
Framework
cis-v1.23-t1.0.1
Severity
Medium
Description of the the issue
A container which mounts a hostPath
volume as part of its specification will have access to the filesystem of the underlying cluster node. The use of hostPath
volumes may allow containers access to privileged areas of the node filesystem.
There should be at least one admission control policy defined which does not permit containers to mount hostPath
volumes.
If you need to run containers which require hostPath
volumes, this should be defined in a separate policy and you should carefully check to ensure that only limited service accounts and users are given permission to use that policy.
Related resources
MutatingWebhookConfiguration, Namespace, ValidatingWebhookConfiguration
What does this control test
Do not generally admit containers which make use of hostPath
volumes.
How to check it manually
List the policies in use for each namespace in the cluster, ensure that each policy disallows the admission of containers with hostPath
volumes.
Remediation
Add policies to each namespace in the cluster which has user workloads to restrict the admission of containers which use hostPath
volumes.
Impact Statement
Pods defined which make use of hostPath
volumes will not be permitted unless they are run under a spefific policy.
Default Value
By default, there are no restrictions on the creation of hostPath
volumes.
Example
No example
Updated 4 months ago