ServiceAccount Allows Access Secrets

• Query id: 056ac60e-fe07-4acc-9b34-8e1d51716ab9
• Query name: ServiceAccount Allows Access Secrets
• Platform: Kubernetes
• Severity: Medium
• Category: Secret Management
• URL: Github

Description

Roles and ClusterRoles when binded, should not use get, list or watch as verbs
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - yaml file

#Vulnerable Role
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  namespace: assembly-prod
  name: testRoleVulnerable
rules:
- apiGroups: [""]
  resources: ["secrets"]
  verbs: ["get", "watch", "list"]
---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: testRoleBinding
  namespace: bindingTestWithBinding
subjects:
- kind: ServiceAccount
  name: testsa
  apiGroup: ""
roleRef:
  kind: Role
  name: testRoleVulnerable
  apiGroup: rbac.authorization.k8s.io
---
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  namespace: assembly-prod
  name: testRoleVulnerable2
rules:
- apiGroups: [""]
  resources: ["secrets"]
  verbs: ["*"]
---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: testRoleBinding
  namespace: bindingTestWithBinding2
subjects:
- kind: ServiceAccount
  name: testsa
  apiGroup: ""
roleRef:
  kind: Role
  name: testRoleVulnerable2
  apiGroup: rbac.authorization.k8s.io
---
# Vulnerable Cluster Role
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: testClusterRoleVulnerable
rules:
- apiGroups: [""]
  resources: ["secrets"]
  verbs: ["update", "list"]
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: bindingTestClusterRoleWithBinding
  namespace: bindingTestClusterRoleWithBindingNamespace
subjects:
- kind: ServiceAccount
  name: testsa
  apiGroup: ""
roleRef:
  kind: ClusterRole
  name: testClusterRoleVulnerable
  apiGroup: rbac.authorization.k8s.io

Code samples without security vulnerabilities

Negative test num. 1 - yaml file

# Vulnerable Role Without Binding
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  namespace: assembly-prod
  name: testRoleWithoutBindingVulnerable
rules:
- apiGroups: [""]
  resources: ["secrets"]
  verbs: ["get", "watch", "list"]
---
# Vulnerable Role With Binding Not Service Account
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  namespace: assembly-prod
  name: testRoleWithBindingVulnerableNotSA
rules:
- apiGroups: [""]
  resources: ["secrets"]
  verbs: ["get", "watch", "list"]
---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: bindingNotSATestRoleWithBindingVulnerable
  namespace: bindingNotSATestRoleWithBindingVulnerableNamespace
subjects:
- kind: NotServiceAccount
  name: testsa
  apiGroup: ""
roleRef:
  kind: Role
  name: testRoleWithBindingVulnerableNotSA
  apiGroup: rbac.authorization.k8s.io
---
# Safe Role With Binding
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  namespace: assembly-prod
  name: testRoleWithBindingSafe
rules:
- apiGroups: [""]
  resources: ["secrets"]
  verbs: ["update"]
---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: bindingtestRoleWithBindingSafe
  namespace: bindingtestRoleWithBindingSafeNamespace
subjects:
- kind: ServiceAccount
  name: testsa
  apiGroup: ""
roleRef:
  kind: Role
  name: testRoleWithBindingSafe
  apiGroup: rbac.authorization.k8s.io
---
# Vulnerable Role with Pod
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  namespace: assembly-prod
  name: testRoleVulnerablePod
rules:
- apiGroups: [""]
  resources: ["pod"]
  verbs: ["get", "watch", "list"]
---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: testRoleBinding
  namespace: bindingTestWithBindingPod
subjects:
- kind: ServiceAccount
  name: testsa
  apiGroup: ""
roleRef:
  kind: Role
  name: testRoleVulnerablePod
  apiGroup: rbac.authorization.k8s.io
---
# Vulnerable Cluster Role Without Binding
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: testClusterRoleWithoutBindingVulnerable
rules:
- apiGroups: [""]
  resources: ["secrets"]
  verbs: ["get", "watch", "list"]
---
# Vulnerable Cluster Role With Binding Not Service Account
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  namespace: default
  name: testClusterRoleWithBindingVulnerableNotSA
rules:
- apiGroups: [""] # "" indicates the core API group
  resources: ["secrets"]
  verbs: ["get", "watch", "list"]
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: bindingNotSATestClusterRoleWithBindingVulnerable
  namespace: bindingNotSATestClusterRoleWithBindingVulnerableNamespace
subjects:
- kind: NotServiceAccount
  name: testsa
  apiGroup: ""
roleRef:
  kind: ClusterRole
  name: testClusterRoleWithBindingVulnerableNotSA
  apiGroup: rbac.authorization.k8s.io
---
# Safe ClusterRole With Binding
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  namespace: default
  name: testClusterRoleWithBindingSafe
rules:
- apiGroups: [""] # "" indicates the core API group
  resources: ["secrets"]
  verbs: ["update"]
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: bindingTestClusterRoleWithBindingSafe
  namespace: bindingTestClusterRoleWithBindingSafeNamespace
subjects:
- kind: NotServiceAccount
  name: testsa
  apiGroup: ""
roleRef:
  kind: ClusterRole
  name: testClusterRoleWithBindingSafe
  apiGroup: rbac.authorization.k8s.io
---
# Vulnerable Cluster Role With Pod
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: testClusterRoleVulnerablePod
rules:
- apiGroups: [""]
  resources: ["pod"]
  verbs: ["update", "list"]
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: bindingTestClusterRoleWithBinding
  namespace: bindingTestClusterRoleWithBindingNamespace
subjects:
- kind: ServiceAccount
  name: testsa
  apiGroup: ""
roleRef:
  kind: ClusterRole
  name: testClusterRoleVulnerablePod
  apiGroup: rbac.authorization.k8s.io