Unset Minimum Instances for Cloud Functions

ID: gcloud-func-min-instances-unset

Severity: medium

Author: princechaddha

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

Description

To minimize cold start latency and enhance performance, ensure that your Google Cloud Functions have a sufficient number of warm instances configured.

YAML Source

id: gcloud-func-min-instances-unset

info:
  name: Unset Minimum Instances for Cloud Functions
  author: princechaddha
  severity: medium
  description: |
    To minimize cold start latency and enhance performance, ensure that your Google Cloud Functions have a sufficient number of warm instances configured.
  impact: |
    Not setting a minimum number of instances for Google Cloud functions can result in potential cold start delays and degraded performance, especially for critical or latency-sensitive functions.
  remediation: |
    Configure the serviceConfig.minInstanceCount parameter for your Google Cloud Functions to an appropriate value that suits your workload demands.
  reference:
    - https://cloud.google.com/functions/docs/scaling#setting_a_minimum_number_of_instances
  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 functionDetail of iterate(template.functions)){
      set("functionName", functionDetail)
      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 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.minInstanceCount)"

    matchers:
      - type: word
        words:
          - 'null'

    extractors:
      - type: dsl
        dsl:
          - '"Minimum Instances not configured for function: " + functionName + " in " + projectId + " project"'
# digest: 4a0a0047304502207b15e888724a1775d166f4d95b30cc734beb8bb8ba06aa18fd3f1a4103b597ca022100ad28c25adefc1443d4d79d24b113bb3f989f4c470674804b8928c305c5dc5e40:922c64590222798bb761d5b6d8e72950

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-min-instances-unset.yaml"

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