cis-ocp-v160-1.2.25
DevOps & SecurityEnsure that the --service-account-lookup argument is set to true (Manual)
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CIS Red Hat OpenShift Container Platform Benchmark v1.6.0 - Control 1.2.25
Profile Applicability
- Level: 1
Description
Validate service account before validating token.
Rationale
If --service-account-lookup is not enabled, the apiserver only verifies that the authentication token is valid, and 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.
Impact
None.
Audit Procedure
OpenShift denies access for any OAuth Access token that does not exist in its etcd data store. OpenShift does not use the service-account-lookup flag even when it is set.
Run the following command:
oc get configmap config -n openshift-kube-apiserver -ojson | jq -r '.data["config.yaml"]' | jq '.apiServerArguments."service-account-lookup"[]'
Verify that if the --service-account-lookup argument exists it is set to true.
Remediation
None.
Default Value
Service account lookup is enabled by default.
References
- https://docs.openshift.com/container-platform/latest/operators/operator-reference.html#kube-apiserver-operator_red-hat-operators
- https://docs.openshift.com/container-platform/latest/operators/operator-reference.html#openshift-apiserver-operator_red-hat-operators
- https://kubernetes.io/docs/reference/command-line-tools-reference/kube-apiserver/
- https://github.com/kubernetes/kubernetes/issues/24167
- https://en.wikipedia.org/wiki/Time-of-check_to_time-of-use
CIS Controls
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 3.3 Configure Data Access Control Lists | x | x | x |
| v7 | 14.7 Enforce Access Control to Data through Automated Tools | x |
MITRE ATT&CK Mappings
| Techniques / Sub-techniques | Tactics | Mitigations |
|---|---|---|
| T1078 | TA0001 | M1026 |
Profile
Level 1 (Manual)