CPU limits not set in Deployments

ID: k8s-cpu-limits-not-set

Severity: medium

Author: princechaddha

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

Description

Checks for missing CPU limits in Kubernetes Deployments, which can lead to excessive CPU usage and affect other applications

YAML Source

id: k8s-cpu-limits-not-set

info:
  name: CPU limits not set in Deployments
  author: princechaddha
  severity: medium
  description: Checks for missing CPU limits in Kubernetes Deployments, which can lead to excessive CPU usage and affect other applications
  impact: |
    Missing CPU limits in Kubernetes Deployments can cause excessive CPU usage that can starve other applications, leading to performance degradation across the cluster.
  remediation: |
    Set CPU limits for all containers in Kubernetes Deployments to ensure fair CPU resource distribution and prevent performance issues.
  reference:
    - https://kubernetes.io/docs/tasks/configure-pod-container/assign-cpu-resource/
  tags: cloud,devops,kubernetes,k8s,devsecops,deployments,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.some(container => container.resources && container.resources.limits && container.resources.limits.cpu)) {
          let result = (`Deployment '${deployment.metadata.name}' in namespace '${deployment.metadata.namespace}' lacks CPU limits.`);
          Export(result);
        }

    extractors:
      - type: dsl
        dsl:
          - response
# digest: 4a0a0047304502206c3a3c7f0f9f56c3d1f8c4a5f9d406f6e237ead7c173b991826750628f6d6e05022100b7a195ad0a73c0d6c2316bdf9ae2357445a5f1ccc3eafd5895a97aae1f0e855f: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-cpu-limits-not-set.yaml"

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