Define network ingress rules

ID: k8s-network-ingress-rules

Severity: medium

Author: princechaddha

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

Description

Checks if Kubernetes network policies define specific ingress rules, which can help secure network communication within the cluster.

YAML Source

id: k8s-network-ingress-rules

info:
  name: Define network ingress rules
  author: princechaddha
  severity: medium
  description: Checks if Kubernetes network policies define specific ingress rules, which can help secure network communication within the cluster.
  impact: |
    Without specific ingress rules defined in network policies, unintended traffic may access pods within the Kubernetes cluster, increasing the risk of malicious activity.
  remediation: |
    Define specific ingress rules in all network policies to control the flow of inbound traffic to pods, ensuring only authorized traffic can access cluster resources.
  reference:
    - https://kubernetes.io/docs/concepts/services-networking/network-policies/
  tags: cloud,devops,kubernetes,security,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 networkpolicies --all-namespaces --output=json
    extractors:
      - type: json
        name: items
        internal: true
        json:
          - '.items[] | {policy: .metadata.name, ingress: .spec.ingress}'

javascript:
  - code: |
        let policyData = JSON.parse(template.policy);
        if (!policyData.ingress || policyData.ingress.length === 0) {
          let result = `Network policy '${policyData.policy}' does not define any ingress rules.`;
          Export(result);
        }

    extractors:
      - type: dsl
        dsl:
          - response
# digest: 4a0a004730450220265aa21f7ef7f2b8fe96be393340482e13148421e00ace791bb7574b97afb1ea022100a477f1ddef5daa295b6dc550c30999aad3d96184cf9692a15eb78e9acf8a4984:922c64590222798bb761d5b6d8e72950

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-network-ingress-rules.yaml"

View on Github