Service Account Name Undefined Or Empty

• Query id: 591ade62-d6b0-4580-b1ae-209f80ba1cd9
• Query name: Service Account Name Undefined Or Empty
• Platform: Kubernetes
• Severity: Medium
• Category: Insecure Defaults
• CWE: 665
• URL: Github

Description

A Kubernetes Pod should have a Service Account defined so to restrict Kubernetes API access, which means the attribute 'serviceAccountName' should be defined and not empty.
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - yaml file

#this is a problematic code where the query should report a result(s)
apiVersion: v1
kind: Pod
metadata:
  name: nginx.container
spec:
  containers:
  - image: nginx
    name: nginx
    volumeMounts:
    - mountPath: /var/run/secrets/tokens
      name: vault-token
  volumes:
  - name: vault-token
    projected:
      sources:
      - serviceAccountToken:
          path: vault-token
          expirationSeconds: 7200
          audience: vault

---

apiVersion: v1
kind: Pod
metadata:
  name: nginx2.container.group
spec:
  containers:
  - image: nginx2
    name: nginx2
    volumeMounts:
    - mountPath: /var/run/secrets/tokens
      name: vault-token
  serviceAccountName:
  volumes:
  - name: vault-token
    projected:
      sources:
      - serviceAccountToken:
          path: vault-token
          expirationSeconds: 7200
          audience: vault

---

apiVersion: v1
kind: Pod
metadata:
  name: nginx3
spec:
  containers:
  - image: nginx3
    name: nginx3
    volumeMounts:
    - mountPath: /var/run/secrets/tokens
      name: vault-token
  serviceAccountName: ""
  volumes:
  - name: vault-token
    projected:
      sources:
      - serviceAccountToken:
          path: vault-token
          expirationSeconds: 7200
          audience: vault

Code samples without security vulnerabilities

Negative test num. 1 - yaml file

#this code is a correct code for which the query should not find any result
apiVersion: v1
kind: Pod
metadata:
  name: nginx
spec:
  containers:
  - image: nginx
    name: nginx
    volumeMounts:
    - mountPath: /var/run/secrets/tokens
      name: vault-token
  serviceAccountName: build-robot
  volumes:
  - name: vault-token
    projected:
      sources:
      - serviceAccountToken:
          path: vault-token
          expirationSeconds: 7200
          audience: vault