Network Policies specify namespace

ID: k8s-netpol-namespace

Severity: medium

Author: princechaddha

Tags: cloud,devops,kubernetes,devsecops,k8s,k8s-cluster-security

Description

Checks for Kubernetes Network Policies that do not specify a namespace, which can lead to potential misconfigurations and security issues.

YAML Source

id: k8s-netpol-namespace

info:
  name: Network Policies specify namespace
  author: princechaddha
  severity: medium
  description: Checks for Kubernetes Network Policies that do not specify a namespace, which can lead to potential misconfigurations and security issues.
  impact: |
    Omitting the namespace in Network Policies can cause the policies to apply incorrectly, potentially exposing Kubernetes resources to unauthorized access. This poses a security risk by not isolating network traffic properly within the cluster.
  remediation: |
    Ensure that all Network Policies explicitly define a namespace to maintain proper network isolation and security boundaries.
  reference:
    - https://kubernetes.io/docs/concepts/services-networking/network-policies/
  tags: cloud,devops,kubernetes,devsecops,k8s,k8s-cluster-security

flow: |
  code(1);
  for (let policy of template.items) {
    set("policy", policy)
    javascript(1);
  }

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: kubectl get netpol --all-namespaces --output=json
    extractors:
      - type: json
        name: items
        internal: true
        json:
          - '.items[] | {policy: .metadata.name, namespace: .metadata.namespace}'

javascript:
  - code: |
        let policyData = JSON.parse(template.policy);
        if (!policyData.namespace) {
          let result = (`Network Policy '${policyData.policy}' does not specify a namespace.`);
          Export(result);
        }

    extractors:
      - type: dsl
        dsl:
          - response
# digest: 4a0a00473045022100c0203a10be2836dd6c5844ac06dbaecf898af5e6f32df09cf5a6032b415228840220759ec592dedbcd5f096e9524206633f430d84f66b0eeeee874967ca882b0fc31:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

$ nuclei -u "URL" -t "cloud/kubernetes/network-policies/k8s-netpol-namespace.yaml"

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