cyberstrikeus CIS Kubernetes Benchmark v2.0.0 - Control 2.5
Profile Applicability
- Level: 1 - Master Node
Description
etcd should be configured for peer authentication.
Rationale
etcd is a highly-available key value store used by Kubernetes deployments for persistent storage of all of its REST API objects. These objects are sensitive in nature and should be accessible only by authenticated etcd peers in the etcd cluster.
Impact
All peers attempting to communicate with the etcd server will require a valid client certificate for authentication.
Audit Procedure
Run the following command on the etcd server node:
ps -ef | grep etcd
Verify that the --peer-client-cert-auth argument is set to true.
Note: This recommendation is applicable only for etcd clusters. If you are using only one etcd server in your environment then this recommendation is not applicable.
Remediation
Edit the etcd pod specification file /etc/kubernetes/manifests/etcd.yaml on the master node and set the below parameter.
--peer-client-cert-auth=true
Default Value
Note: This recommendation is applicable only for etcd clusters. If you are using only one etcd server in your environment then this recommendation is not applicable.
By default, --peer-client-cert-auth argument is set to false.
References
- https://coreos.com/etcd/docs/latest/op-guide/security.html
- https://kubernetes.io/docs/admin/etcd/
- https://coreos.com/etcd/docs/latest/op-guide/configuration.html#peer-client-cert-auth
CIS Controls
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 3.3 Configure Data Access Control ListsConfigure data access control lists based on a user's need to know. Apply data access control lists, also known as access permissions, to local and remote file systems, databases, and applications. | ● | ● | ● |
| v7 | 14.6 Protect Information through Access Control ListsProtect all information stored on systems with file system, network share, claims, application, or database specific access control lists. These controls will enforce the principle that only authorized individuals should have access to the information based on their need to access the information as a part of their responsibilities. | ● | ● | ● |
Profile
Level 1 - Master Node (Automated)