RBAC roles with attach permission

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Metadata

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

Cloud Provider: k8s

Platform: Kubernetes

Severity: Medium

Category: Access Control

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Description

Roles or ClusterRoles that permit attaching to containers via kubectl attach can be abused by attackers to read process output (stdout, stderr) and send input (stdin) to running processes. They can also allow a malicious user to attach to a privileged container, resulting in privilege escalation. For this reason, the pods/attach resource should not be included in production Role or ClusterRole rules. This rule flags Role or ClusterRole documents whose rules include the pods/attach resource (and related verb entries such as create or *). Findings support least-privilege enforcement by identifying and removing attach permissions from cluster roles.

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: ""