Containers with sys admin capabilities

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Metadata

Id: 235236ee-ad78-4065-bd29-61b061f28ce0

Cloud Provider: Kubernetes

Platform: Kubernetes

Severity: High

Category: Insecure Configurations

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Description

Containers should not include the CAP_SYS_ADMIN Linux capability. This rule flags any resource where a container or initContainer adds SYS_ADMIN to securityContext.capabilities.add. CAP_SYS_ADMIN grants broad privileges and can enable privilege escalation, so it must not be granted to container processes.

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"

Non-Compliant Code Examples

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