Route53 record undefined

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Metadata

Id: 24d932e1-91f0-46ea-836f-fdbd81694151

Cloud Provider: AWS

Platform: CloudFormation

Severity: High

Category: Networking and Firewall

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Description

A Route 53 hosted zone without any DNS record sets can lead to service outages from missing DNS entries. It also increases the risk of unmanaged or manual record additions that bypass infrastructure-as-code controls.

In CloudFormation, every AWS::Route53::HostedZone should be accompanied by one or more AWS::Route53::RecordSet resources. Record sets should reference the hosted zone via HostedZoneId or HostedZoneName, and define Name and Type (plus appropriate record data such as TTL and ResourceRecords. Templates that create an AWS::Route53::HostedZone but contain no AWS::Route53::RecordSet resources in the same template will be flagged.

Secure example referencing the hosted zone ID:

MyHostedZone:
  Type: AWS::Route53::HostedZone
  Properties:
    Name: example.internal

MyRecordSet:
  Type: AWS::Route53::RecordSet
  Properties:
    HostedZoneId: !Ref MyHostedZone
    Name: service.example.internal.
    Type: A
    TTL: '300'
    ResourceRecords:
      - 10.0.0.10

Compliant Code Examples

AWSTemplateFormatVersion: "2010-09-09"
Description: "Router53"
Resources:
  HostedZone:
    Type: AWS::Route53::HostedZone
    Properties:
      Name: "HostedZone"
  RecordSet:
    Type: AWS::Route53::RecordSet
    Properties:
      HostedZoneId: !Ref HostedZoneId
      Name: !Join ['', [!Ref DomainName, '.', !Ref HostedZoneName, '.']]
      Type: CNAME
      TTL: '900'
      ResourceRecords:
      - !Ref DnsEndpoint

{
  "Description": "Router53",
  "Resources": {
    "HostedZone": {
      "Type": "AWS::Route53::HostedZone",
      "Properties": {
        "Name": "HostedZone"
      }
    },
    "RecordSet": {
      "Type": "AWS::Route53::RecordSet",
      "Properties": {
        "HostedZoneId": "HostedZoneId",
        "Name": [
          "",
          [
            "DomainName",
            ".",
            "HostedZoneName",
            "."
          ]
        ],
        "Type": "CNAME",
        "TTL": "900",
        "ResourceRecords": [
          "DnsEndpoint"
        ]
      }
    }
  },
  "AWSTemplateFormatVersion": "2010-09-09"
}

Non-Compliant Code Examples

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Description": "Router53",
  "Resources": {
    "HostedZone": {
      "Type": "AWS::Route53::HostedZone",
      "Properties": {
        "Name": "HostedZone"
      }
    }
  }
}

AWSTemplateFormatVersion: "2010-09-09"
Description: "Router53"
Resources:
  HostedZone:
    Type: AWS::Route53::HostedZone
    Properties:
      Name: "HostedZone"