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Containers with added capabilities

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Metadata

Id: kubernetes-containers-with-added-capabilities

Platform: Kubernetes

Severity: Medium

Category: Insecure Configurations

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Description

Containers and initContainers should not include added capabilities other than NET_BIND_SERVICE. The rule checks container.securityContext.capabilities.add and reports an IncorrectValue when any capability other than NET_BIND_SERVICE is present. It applies to both containers and initContainers found in the pod spec.

Compliant Code Examples

apiVersion: v1
kind: Pod
metadata:
  name: pod1
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"

apiVersion: v1
kind: Pod
metadata:
  name: pod4
spec:
  containers:
  - name: app
    image: images.my-company.example/app:v4
    securityContext:
      allowPrivilegeEscalation: false
      capabilities:
        drop:
          - ALL
        add:
          - NET_BIND_SERVICE
    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"

Non-Compliant Code Examples

apiVersion: v1
kind: Pod
metadata:
  name: pod2
spec:
  containers:
  - name: app
    image: images.my-company.example/app:v4
    securityContext:
      allowPrivilegeEscalation: false
      capabilities:
           add: ["NET_ADMIN", "SYS_TIME"]
    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: Pod
metadata:
  name: pod3
spec:
  initContainers:
  - name: app
    image: images.my-company.example/app:v4
    securityContext:
      allowPrivilegeEscalation: false
      capabilities:
           add: ["NET_ADMIN", "SYS_TIME"]
    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"
  containers:
  - name: app
    image: images.my-company.example/app:v4