RBAC roles with attach permission

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Metadata

Id: d45330fd-f58d-45fb-a682-6481477a0f84

Cloud Provider: k8s

Framework: Kubernetes

Severity: Medium

Category: Access Control

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Description

Roles or ClusterRoles with permissions to attach to containers via kubectl attach could be abused by attackers to read log output (stdout, stderr) and send input data (stdin) to running processes. Additionally, it could allow a malicious user to attach to a privileged container, resulting in privilege escalation. To prevent this, the pods/attach verb should not be used in production environments.

Compliant Code Examples

apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  namespace: my-namespace
  name: allow-attach-neg
rules:
- apiGroups: [""]
  resources: ["pods"]
  verbs: ["get", "list", "create"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: allow-attach-neg
  namespace: my-namespace
subjects:
- kind: User
  name: bob
  apiGroup: rbac.authorization.k8s.io
roleRef:
  kind: Role
  name: allow-attach-neg
  apiGroup: ""

Non-Compliant Code Examples

apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  namespace: my-namespace
  name: allow-attach
rules:
- apiGroups: [""]
  resources: ["pods", "pods/attach"]
  verbs: ["get", "list", "create"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: allow-attach
  namespace: my-namespace
subjects:
- kind: User
  name: bob
  apiGroup: rbac.authorization.k8s.io
roleRef:
  kind: Role
  name: allow-attach
  apiGroup: ""