Inactive Service Accounts in Google Cloud Functions

ID: gcloud-func-inactive-svc-acc

Severity: high

Author: princechaddha

Tags: cloud,devops,gcp,gcloud,google-cloud-functions,gcp-cloud-config

Description

Ensure that your Google Cloud functions are referencing existing, active service accounts in order to prevent execution failures and operational disruptions.

YAML Source

id: gcloud-func-inactive-svc-acc

info:
  name: Inactive Service Accounts in Google Cloud Functions
  author: princechaddha
  severity: high
  description: |
    Ensure that your Google Cloud functions are referencing existing, active service accounts in order to prevent execution failures and operational disruptions.
  impact: |
    Using inactive or deleted service accounts in Google Cloud Functions can lead to runtime errors and potential service disruption, affecting the stability and reliability of cloud services.
  remediation: |
    Verify and update the service accounts associated with your Google Cloud functions to ensure they are active and have the necessary permissions for function execution.
  reference:
    - https://cloud.google.com/functions/docs/securing/managing-access-iam
  tags: cloud,devops,gcp,gcloud,google-cloud-functions,gcp-cloud-config

flow: |
  code(1)
  for(let projectId of iterate(template.projectIds)){
    set("projectId", projectId)
    code(2)
    for(let functionName of iterate(template.functions)){
      set("functionName", functionName)
      code(3)
        for(let serviceAccountEmail of iterate(template.serviceAccountEmail)){
        set("serviceAccountEmail", serviceAccountEmail)
        code(4)
      }
    }
  }

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 functions list --project $projectId --format="json(name)"

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

  - engine:
      - sh
      - bash
    source: |
      gcloud functions describe $functionName --format="json(serviceConfig.serviceAccountEmail)"

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

  - engine:
      - sh
      - bash
    source: |
      gcloud iam service-accounts describe $serviceAccountEmail --format="json(disabled)"

    matchers:
      - type: word
        words:
          - 'PERMISSION_DENIED:'
          - 'ERROR:'
          - 'disabled'
        condition: or

    extractors:
      - type: dsl
        dsl:
          - '"Inactive Service Account: " + serviceAccountEmail + ", Function: " + functionName + " in " + projectId + " project"'
# digest: 4b0a00483046022100b3a88d907cebddde0a630870a7c5ca519f91bcc44458251a401c29d179f8d1a7022100a890c368897f632fea8e9340f73adde68fe56e87c3f8b55fdd7d8d5aa7a3d73d: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/function/gcloud-func-inactive-svc-acc.yaml"

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