1.1.23 Ensure that the --service-account-lookup argument is set to true

Information

Validate service account before validating token.

Rationale:

By default, the apiserver only verifies that the authentication token is valid. However, it does not validate that the service account token mentioned in the request is actually present in etcd. This allows using a service account token even after the corresponding service account is deleted. This is an example of time of check to time of use security issue.

Solution

Edit the API server pod specification file '/etc/kubernetes/manifests/kube-apiserver.yaml' on the master node and set the below parameter.

--service-account-lookup=true

Impact:

None

See Also

https://workbench.cisecurity.org/files/1788

Item Details

Category: IDENTIFICATION AND AUTHENTICATION

References: 800-53|IA-5(13), CSCv6|16

Plugin: Unix

Control ID: 993bb1de282499e3e05a49c07cfa4083c318efacbbaa2a4dbbf99d07dff79ce0