stack-notification-disabled: CloudFormation Stack Notification - Disabled

id: stack-notification-disabled

info:
  name: CloudFormation Stack Notification - Disabled
  author: DhiyaneshDK
  severity: medium
  description: |
    Ensure that your Amazon CloudFormation stacks are using SNS topics to send notifications when important events occur.
  impact: |
    Disabling CloudFormation Stack Notifications can lead to reduced visibility into stack events and errors, delaying the detection of issues and hindering effective monitoring of changes and deployments in the cloud environment.
  remediation: |
    Enable CloudFormation Stack Notifications by configuring SNS (Simple Notification Service) topics for your CloudFormation stack. This will ensure real-time alerts on stack events, including updates, errors, and resource creation, providing better monitoring and visibility.
  reference:
    - https://www.trendmicro.com/cloudoneconformity-staging/knowledge-base/aws/CloudFormation/cloudformation-stack-notification.html
    - http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-stack.html
  tags: cloud,devops,aws,amazon,cloudformation,aws-cloud-config

variables:
  region: "us-west-2"

flow: |
  code(1)
  for(let StackSummaries of iterate(template.stacksummaries)){
    set("stacksummary", StackSummaries)
    code(2)
  }

self-contained: true

code:
  - engine:
      - sh
      - bash
    source: |
      aws cloudformation list-stacks --region $region --stack-status-filter CREATE_COMPLETE --output json --query 'StackSummaries[*].StackName'

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

  - engine:
      - sh
      - bash
    source: |
        aws cloudformation describe-stacks --region $region --stack-name $stacksummary --query 'Stacks[*].NotificationARNs[]'

    matchers:
      - type: word
        words:
          - '[]'

    extractors:
      - type: dsl
        dsl:
          - '"CloudFormation Stack Notification " + stacksummary + " is Disabled"'
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