Default Namespace Usage in Deployments

ID: k8s-default-namespace-used

Severity: high

Author: princechaddha

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

Description

Checks if Kubernetes Deployments are using the default namespace, which can lead to security risks and mismanagement issues.

YAML Source

id: k8s-default-namespace-used

info:
  name: Default Namespace Usage in Deployments
  author: princechaddha
  severity: high
  description: Checks if Kubernetes Deployments are using the default namespace, which can lead to security risks and mismanagement issues.
  impact: |
    Using the default namespace for Kubernetes Deployments can increase security risks as it might allow broader access than necessary. It also complicates resource management across multiple teams and applications.
  remediation: |
    Avoid using the default namespace for Kubernetes Deployments. Create and specify dedicated namespaces tailored to specific applications or teams to enhance security and manage resources effectively.
  reference:
    - https://kubernetes.io/docs/concepts/overview/working-with-objects/namespaces/
  tags: cloud,devops,kubernetes,k8s,devsecops,namespaces,k8s-cluster-security

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

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: kubectl get deployments --all-namespaces --output=json
    extractors:
      - type: json
        name: items
        internal: true
        json:
          - '.items[]'

javascript:
  - code: |
        deployment = JSON.parse(template.deployment);
        if (deployment.metadata.namespace.toLowerCase() === "default") {
          let result = (`Deployment '${deployment.metadata.name}' is using the default namespace, which is not recommended.`);
          Export(result);
        }

    extractors:
      - type: dsl
        dsl:
          - response
# digest: 4a0a00473045022100b71eb5a7941e4eac93b5edecbbf8c81ef9cd2ec9b2c6690f6dd66dc385a954030220797e5e846a6cf5276a2f7f25a0f6a800dcf23f163b114046373a827a3e070623:922c64590222798bb761d5b6d8e72950

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/deployments/k8s-default-namespace-used.yaml"

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