A Kubernetes user was assigned cluster administrator permissions

kubernetes

Classification:

attack

Tactic:

TA0004-privilege-escalation

Set up the kubernetes integration.

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Goal

Identify when a Kubernetes user is assigned cluster-level administrative permissions.

Strategy

This rule monitors when a ClusterRoleBinding object is created to bind a Kubernetes user to the cluster-admin default cluster-wide role. This effectively grants the referenced user with full administrator permissions over all the Kubernetes cluster.

Triage and response

  1. Determine if the Kubernetes user referenced in @requestObject.subjects is expected to have been granted administrator permissions on the cluster
  2. Determine if the actor (@usr.id) is authorized to assign administrator permissions
  3. Use the Cloud SIEM User Investigation dashboard to review any user actions that may have occurred after the potentially malicious action.

Changelog

  • 20 September 2022 - Updated tags.
  • 7 May 2024 - Updated detection query to include logs from Azure Kubernetes Service.
  • 15 July 2024 - Updated detection query to include logs from Google Kubernetes Engine.