cis-ocp-v160-1.3.5
DevOps & SecurityEnsure that the --bind-address argument is set to 127.0.0.1 (Manual)
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CIS Red Hat OpenShift Container Platform Benchmark v1.6.0 - Control 1.3.5
Profile Applicability
- Level: 1
Description
Do not bind the Controller Manager service to non-loopback insecure addresses.
Rationale
The Controller Manager API service which runs on port 10257/TCP by default is used for health and metrics information and is available without authentication or encryption. As such it should only be bound to a localhost interface, to minimize the cluster's attack surface.
Impact
None.
Audit Procedure
The bind-address argument is not used. The secure-port argument is set to 10257. The insecure-port argument is set to 0.
Use the following command to check the secure port configuration:
oc get configmaps config -n openshift-kube-controller-manager -ojson | jq -r '.data["config.yaml"]' | jq '.extendedArguments["secure-port"][]'
Verify the returned value is 10257.
Ensure the metrics endpoint is protected from unauthorized access:
export POD=$(oc get pods -n openshift-kube-controller-manager -l app=kube-controller-manager -o jsonpath='{.items[0].metadata.name}')
oc rsh -n openshift-kube-controller-manager -c kube-controller-manager $POD curl https://localhost:10257/metrics -k
Verify an HTTP 403 response is returned and unset environment variables:
unset POD
Remediation
None.
Default Value
By default, the --bind-address argument is not present, the secure-port argument is set to 10257 and the port argument is set to 0.
References
- https://docs.openshift.com/container-platform/4.5/operators/operator-reference.html#cluster-openshift-controller-manager-operator_red-hat-operators
- https://docs.openshift.com/container-platform/4.5/operators/operator-reference.html#kube-controller-manager-operator_red-hat-operators
- https://github.com/openshift/cluster-kube-controller-manager-operator
- https://kubernetes.io/docs/reference/command-line-tools-reference/kube-controller-manager/
CIS Controls
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 12.6 Use of Secure Network Management and Communication Protocols | X | X | |
| v7 | 9.2 Ensure Only Approved Ports, Protocols and Services Are Running | X | X |
MITRE ATT&CK Mappings
| Techniques / Sub-techniques | Tactics | Mitigations |
|---|---|---|
| T1106 | TA0002 | M1035 |
Profile
Level 1 (Manual)