CNI Plugin Does Not Support Network Policies

Query id: 03aabc8c-35d6-481e-9c85-20139cf72d23
Query name: CNI Plugin Does Not Support Network Policies
Platform: Kubernetes
Severity: Medium
Category: Networking and Firewall
URL: Github

Description¶

Ensure the use of CNI Plugin that support Network Policies. If the CNI Plugin in use does not support Network Policies it may not be possible to effectively restrict traffic in the cluster
Documentation

Code samples¶

Code samples with security vulnerabilities¶

Postitive test num. 1 - json file

{
  "name": "k8s-pod-network",
  "cniVersion": "0.3.0",
  "plugins": [
    {
      "type": "flannel",
      "log_level": "info",
      "datastore_type": "kubernetes",
      "nodename": "127.0.0.1",
      "ipam": {
        "type": "host-local",
        "subnet": "usePodCidr"
      },
      "policy": {
        "type": "k8s"
      },
      "kubernetes": {
        "kubeconfig": "/etc/cni/net.d/flannel-kubeconfig"
      }
    },
    {
      "type": "portmap",
      "capabilities": {"portMappings": true}
    }
  ]
}

Code samples without security vulnerabilities¶

Negative test num. 1 - json file

{
  "name": "k8s-pod-network",
  "cniVersion": "0.3.0",
  "plugins": [
    {
      "type": "calico",
      "log_level": "info",
      "datastore_type": "kubernetes",
      "nodename": "127.0.0.1",
      "ipam": {
        "type": "host-local",
        "subnet": "usePodCidr"
      },
      "policy": {
        "type": "k8s"
      },
      "kubernetes": {
        "kubeconfig": "/etc/cni/net.d/calico-kubeconfig"
      }
    },
    {
      "type": "portmap",
      "capabilities": {"portMappings": true}
    }
  ]
}