Using Unrecommended Namespace

• Query id: 611ab018-c4aa-4ba2-b0f6-a448337509a6
• Query name: Using Unrecommended Namespace
• Platform: Kubernetes
• Severity: Medium
• Category: Insecure Configurations
• URL: Github

Description

Namespaces like 'default', 'kube-system' or 'kube-public' should not be used
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - yaml file

apiVersion: v1
kind: Pod
metadata:
  name: frontend
  namespace: default
spec:
  containers:
  - name: app
    image: images.my-company.example/app:v4
    securityContext:
      allowPrivilegeEscalation: false
    resources:
      requests:
        memory: "64Mi"
        cpu: "250m"
      limits:
        memory: "128Mi"
        cpu: "500m"

  - name: log-aggregator
    image: images.my-company.example/log-aggregator:v6
    securityContext:
      allowPrivilegeEscalation: false
    resources:
      requests:
        memory: "64Mi"
        cpu: "250m"
      limits:
        memory: "128Mi"
        cpu: "500m"

Positive test num. 2 - yaml file

apiVersion: v1
kind: Pod
metadata:
  name: frontend2
spec:
  containers:
  - name: app
    image: images.my-company.example/app:v4
    securityContext:
      allowPrivilegeEscalation: false
    resources:
      requests:
        memory: "64Mi"
        cpu: "250m"
      limits:
        memory: "128Mi"
        cpu: "500m"

  - name: log-aggregator
    image: images.my-company.example/log-aggregator:v6
    securityContext:
      allowPrivilegeEscalation: false
    resources:
      requests:
        memory: "64Mi"
        cpu: "250m"
      limits:
        memory: "128Mi"
        cpu: "500m"

Positive test num. 3 - yaml file

apiVersion: v1
kind: Pod
metadata:
  name: mongo.db.collection.com
  namespace: kube-public

Positive test num. 4 - yaml file

apiVersion: v1
kind: Pod
metadata:
  name: mongo.db.collection.com
  namespace: kube-system

Positive test num. 5 - yaml file

apiVersion: serving.knative.dev/v1
kind: Configuration
metadata:
  name: dummy-config
  namespace: default
spec:
  template:
    spec:
      automountServiceAccountToken: true
      securityContext:
        runAsUser: 1000
        runAsGroup: 3000
        fsGroup: 2000
      volumes:
        - name: sec-ctx-vol
          emptyDir: { }
      containers:
        - name: sec-ctx-demo
          image: busybox
          command: [ "sh", "-c", "sleep 1h" ]
          volumeMounts:
            - name: sec-ctx-vol
              mountPath: /data/demo
          securityContext:
            allowPrivilegeEscalation: false      

Code samples without security vulnerabilities

Negative test num. 1 - yaml file

apiVersion: v1
kind: Pod
metadata:
  name: frontend
  namespace: cosmicPod
spec:
  securityContext:
    runAsUser: 1000
  containers:
  - name: app
    image: images.my-company.example/app:v4
    securityContext:
      allowPrivilegeEscalation: false
    resources:
      requests:
        memory: "64Mi"
        cpu: "250m"
      limits:
        memory: "128Mi"
        cpu: "500m"

  - name: log-aggregator
    image: images.my-company.example/log-aggregator:v6
    securityContext:
      allowPrivilegeEscalation: false
    resources:
      requests:
        memory: "64Mi"
        cpu: "250m"
      limits:
        memory: "128Mi"
        cpu: "500m"

---
apiVersion: v1
kind: CustomResourceDefinition
metadata:
  name: mongo.db.collection.com