C-0220 - Minimize the admission of containers with capabilities assigned
Framework
cis-eks-t1.2.0
Severity
Medium
Description of the the issue
Containers run with a default set of capabilities as assigned by the Container Runtime. Capabilities are parts of the rights generally granted on a Linux system to the root user.
In many cases applications running in containers do not require any capabilities to operate, so from the perspective of the principal of least privilege use of capabilities should be minimized.
Related resources
PodSecurityPolicy
What does this control test
Do not generally permit containers with capabilities
How to check it manually
Get the set of PSPs with the following command:
kubectl get psp
For each PSP, check whether capabilities have been forbidden:
kubectl get psp <name> -o=jsonpath='{.spec.requiredDropCapabilities}'
Remediation
Review the use of capabilities in applications running on your cluster. Where a namespace contains applications which do not require any Linux capabilities to operate consider adding a PSP which forbids the admission of containers which do not drop all capabilities.
Impact Statement
Pods with containers require capabilities to operate will not be permitted.
Default Value
By default, PodSecurityPolicies are not defined.
Example
No example
Updated 4 months ago