Host PID Namespace Sharing

ID: k8s-host-pid-namespace-sharing

Severity: critical

Author: princechaddha

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

Description

Checks if containers in Kubernetes pods share the host’s process ID namespace, which can pose a security risk.

YAML Source

id: k8s-host-pid-namespace-sharing

info:
  name: Host PID Namespace Sharing
  author: princechaddha
  severity: critical
  description: Checks if containers in Kubernetes pods share the host's process ID namespace, which can pose a security risk.
  impact: |
    Sharing the host's PID namespace allows processes within the pod to view all of the processes on the host, potentially leading to privilege escalation and other security vulnerabilities.
  remediation: |
    Ensure that the 'hostPID' field is set to 'false' in Kubernetes Pod specifications to prevent containers from sharing the host's PID namespace.
  reference:
    - https://kubernetes.io/docs/concepts/policy/pod-security-policy/#host-namespaces
  tags: cloud,devops,kubernetes,k8s,devsecops,pods,k8s-cluster-security

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

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

javascript:
  - code: |
        pod = JSON.parse(template.pod);
        if (pod.spec.hostPID) {
          let result = (`Pod '${pod.metadata.name}' in namespace '${pod.metadata.namespace}' is sharing the host's PID namespace.`);
          Export(result);
        }
    extractors:
      - type: dsl
        dsl:
          - response
# digest: 490a004630440220132cec00e11e6e75b6861b85596700ee6649387258a67748eebecae1f43e343502206eb8e71a719d664fe8b67f0a04ba54067e665edd329c8ccd19e53b6feaad3392:922c64590222798bb761d5b6d8e72950

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/pods/k8s-host-pid-namespace-sharing.yaml"

View on Github