Filestore Instance Not Using Customer-Managed Encryption Keys

ID: gcloud-filestore-no-cmek

Severity: high

Author: princechaddha

Tags: cloud,devops,gcp,gcloud,filestore,security,encryption,cmek,gcp-cloud-config

Description

Ensure that data stored on your Google Cloud Filestore instances is encrypted at rest with Customer-Managed Encryption Keys (CMEK) instead of Google-managed encryption keys. CMEKs provide greater control over the encryption and decryption process, enabling you to meet stringent compliance requirements.

YAML Source

id: gcloud-filestore-no-cmek

info:
  name: Filestore Instance Not Using Customer-Managed Encryption Keys
  author: princechaddha
  severity: high
  description: |
    Ensure that data stored on your Google Cloud Filestore instances is encrypted at rest with Customer-Managed Encryption Keys (CMEK) instead of Google-managed encryption keys. CMEKs provide greater control over the encryption and decryption process, enabling you to meet stringent compliance requirements.
  impact: |
    Without Customer-Managed Encryption Keys, you have less control over data encryption and key management, potentially impacting compliance requirements and security controls.
  remediation: |
    Re-create your Filestore instances with Customer-Managed Encryption Keys using Cloud KMS. Configure a key ring and CMK in Cloud KMS, then specify the key when creating the instance using the '--kms-key' flag or through the console.
  reference:
    - https://www.trendmicro.com/cloudoneconformity/knowledge-base/gcp/Filestore/instances-encrypted-with-cmeks.html
    - https://cloud.google.com/filestore/docs/encryption
  tags: cloud,devops,gcp,gcloud,filestore,security,encryption,cmek,gcp-cloud-config

flow: |
  code(1)
  for(let projectId of iterate(template.projectIds)){
    set("projectId", projectId)
    code(2)
    for(let instance of iterate(template.instances)){
      instance = JSON.parse(instance)
      set("instanceName", instance.name)
      code(3)
    }
  }

self-contained: true

code:
  - engine:
      - sh
      - bash
    source: |
      gcloud projects list --format="json(projectId)"

    extractors:
      - type: json
        name: projectIds
        internal: true
        json:
          - '.[].projectId'

  - engine:
      - sh
      - bash
    source: |
      gcloud filestore instances list --project $projectId --format="json"

    extractors:
      - type: json
        name: instances
        internal: true
        json:
          - '.[]'

  - engine:
      - sh
      - bash
    source: |
      gcloud filestore instances describe $instanceName --format="json(kmsKeyName)"

    matchers:
      - type: word
        words:
          - "null"

    extractors:
      - type: dsl
        dsl:
          - '"Filestore instance " + instanceName + " in project " + projectId + " is not encrypted with Customer-Managed Keys"'
# digest: 4b0a00483046022100fd2570405f1c980b4b00e67f6196382afe7256a57a48e0e84d7cfe692829cb69022100818fb544dedb23d518adf3957d5f3204d55a58873afd58e13283777684a714e8:922c64590222798bb761d5b6d8e72950

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/gcp/filestore/gcloud-filestore-no-cmek.yaml"

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