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cis-aks-v180-4.1.4

DevOps & Security
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Minimize access to create pods (Manual)

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4.1.4 Minimize access to create pods (Manual)

Profile Applicability

  • Level 1

Description

The ability to create pods in a namespace can provide a number of opportunities for privilege escalation, such as assigning privileged service accounts to these pods or mounting hostPaths with access to sensitive data (unless Pod Security Policies are implemented to restrict this access).

As such, access to create new pods should be restricted to the smallest possible group of users.

Rationale

The ability to create pods in a cluster opens up possibilities for privilege escalation and should be restricted, where possible.

Impact

Care should be taken not to remove access to pods to system components which require this for their operation.

Audit

Review the users who have create access to pod objects in the Kubernetes API.

Remediation

Where possible, remove create access to pod objects in the cluster.

Default Value

By default, the following list of principals have create privileges on pod objects:

CLUSTERROLEBINDINGSUBJECT
cluster-admin (Group)system:masters
system:controller:clusterrole-aggregation-controller (ServiceAccount kube-system)clusterrole-aggregation-controller
system:controller:daemon-set-controller (ServiceAccount kube-system)daemon-set-controller
system:controller:job-controller (ServiceAccount kube-system)job-controller
system:controller:persistent-volume-binder (ServiceAccount kube-system)persistent-volume-binder
system:controller:replicaset-controller (ServiceAccount kube-system)replicaset-controller
system:controller:replication-controller (ServiceAccount kube-system)replication-controller
system:controller:statefulset-controller (ServiceAccount kube-system)statefulset-controller

References

  1. https://docs.microsoft.com/security/benchmark/azure/security-controls-v2-privileged-access#pa-7-follow-just-enough-administration-least-privilege-principle

CIS Controls

Controls VersionControlIG 1IG 2IG 3
v84.1 Establish and Maintain a Secure Configuration Processxxx
v75.2 Maintain Secure Imagesxx