Image Pull Policy set to Always

ID: k8s-image-pull-policy-always

Severity: low

Author: princechaddha

Tags: cloud,devops,kubernetes,k8s,devsecops,deployments,images,docker,k8s-cluster-security

Description

Ensures that Kubernetes deployments have the image pull policy set to ‘Always’, which guarantees the most up-to-date version of the image is used.

YAML Source

id: k8s-image-pull-policy-always

info:
  name: Image Pull Policy set to Always
  author: princechaddha
  severity: low
  description: Ensures that Kubernetes deployments have the image pull policy set to 'Always', which guarantees the most up-to-date version of the image is used.
  impact: |
    Not setting the image pull policy to 'Always' may cause pods to use outdated versions of images, which can lead to security vulnerabilities if the images contain fixes or updates.
  remediation: Update the image pull policy in Kubernetes Deployments to 'Always' to ensure that the latest container images are always used.
  reference:
    - https://kubernetes.io/docs/concepts/containers/images/#updating-images
  tags: cloud,devops,kubernetes,k8s,devsecops,deployments,images,docker,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.spec.template.spec.containers.every(container => container.imagePullPolicy === 'Always')) {
          let result = (`Deployment '${deployment.metadata.name}' in namespace '${deployment.metadata.namespace}' does not have image pull policy set to Always.`);
          Export(result);
        }

    extractors:
      - type: dsl
        dsl:
          - response
# digest: 490a0046304402206b99c38b3c7a728baebe728ad16916a649d1322ef1140913ac8a43488309469302202a8458215efee01be4f2529788717cc7d34fd874acf2b990e5fc46bf99cf79d4:922c64590222798bb761d5b6d8e72950

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-image-pull-policy-always.yaml"

View on Github