AWS Cloudfront Distribution Cname Records Without S3 Origin

Triage and Remediation

Remediation

Remediation

Using Console

To remediate the misconfiguration of an AWS CloudFront distribution CNAME record having no S3 origin, you can follow these step-by-step instructions using the AWS Management Console:

Open the AWS Management Console and navigate to the Route 53 service.
In the Route 53 dashboard, click on "Hosted zones" in the left-hand navigation pane.
Select the hosted zone associated with the domain name used for the CloudFront distribution.
In the list of records, locate the CNAME record pointing to the CloudFront distribution.
Click on the record to select it.
Click on the "Edit" button above the record list.
In the "Value/Route traffic to" field, enter the S3 bucket endpoint as the value. You can find the S3 bucket endpoint by navigating to the S3 service, selecting the bucket used as the origin for the CloudFront distribution, and copying the bucket's endpoint URL.
After entering the S3 bucket endpoint, click on the "Save Record Set" button to save the changes.
Once the changes are saved, the CNAME record will be updated to point to the S3 bucket as the origin for the CloudFront distribution.
Verify the changes by accessing your website or application through the CloudFront distribution URL. The content should now be served from the S3 bucket.

By following these steps, you will successfully remediate the misconfiguration of the AWS CloudFront distribution CNAME record having no S3 origin using the AWS Management Console in Route 53.

Using CLI

To remediate the issue of an AWS CloudFront distribution CNAME record having no S3 origin using AWS CLI, you can follow these step-by-step instructions:

Install and configure the AWS CLI if you haven't already. You can refer to the AWS CLI documentation for instructions on installation and configuration.
Open your command-line interface (CLI) and ensure that you have the necessary permissions to make changes to AWS resources.
Identify the CloudFront distribution that needs to be remediated. You can use the following command to list all your CloudFront distributions:
```
aws cloudfront list-distributions
```
Note down the distribution ID of the affected CloudFront distribution.
Retrieve the current configuration of the CloudFront distribution using the following command:
```
aws cloudfront get-distribution-config --id <distribution-id>
```
Replace <distribution-id> with the actual distribution ID you noted down in the previous step.
The output of the previous command will provide a JSON representation of the distribution configuration. Look for the "Origins" section and identify the origin that is missing the S3 bucket.

To add an S3 origin to the CloudFront distribution, you need to update the distribution configuration. Create a JSON file with the updated configuration, including the missing S3 origin. For example:

{
  "DistributionConfig": {
    "Origins": {
      "Items": [
        {
          "Id": "S3-origin",
          "DomainName": "your-s3-bucket.s3.amazonaws.com",
          "S3OriginConfig": {
            "OriginAccessIdentity": ""
          }
        }
      ],
      "Quantity": 1
    },
    "Enabled": true,
    "Comment": "Your distribution comment",
    ...
  }
}

Replace "your-s3-bucket" with the name of your actual S3 bucket.

Save the JSON file with the updated configuration.
Update the CloudFront distribution configuration using the following command:
```
aws cloudfront update-distribution --id <distribution-id> --distribution-config file://<path-to-json-file>
```
Replace <distribution-id> with the actual distribution ID, and <path-to-json-file> with the path to the JSON file you created in the previous step.
Wait for the CloudFront distribution to be updated. You can monitor the progress by using the following command:
```
aws cloudfront wait distribution-deployed --id <distribution-id>
```
Replace <distribution-id> with the actual distribution ID.
Once the distribution is deployed, the CNAME record will be updated automatically with the S3 origin.

By following these steps, you should be able to remediate the AWS CloudFront distribution CNAME record misconfiguration by adding the missing S3 origin.

Using Python

To remediate the misconfiguration of an AWS CloudFront distribution CNAME record having no S3 origin using Python, follow these steps:

Import the required AWS SDK libraries:

import boto3

Initialize the AWS Route53 client:

route53_client = boto3.client('route53')

Get the hosted zone ID for your domain:

response = route53_client.list_hosted_zones_by_name(
    DNSName='yourdomain.com'
)

hosted_zone_id = response['HostedZones'][0]['Id']

Retrieve the existing CNAME record:

response = route53_client.list_resource_record_sets(
    HostedZoneId=hosted_zone_id,
    StartRecordName='yourdomain.com',
    StartRecordType='CNAME',
    MaxItems='1'
)

cname_record = response['ResourceRecordSets'][0]

Update the CNAME record to point to the CloudFront distribution:

cname_record['ResourceRecords'][0]['Value'] = 'your-cloudfront-distribution-domain.com'

response = route53_client.change_resource_record_sets(
    HostedZoneId=hosted_zone_id,
    ChangeBatch={
        'Changes': [
            {
                'Action': 'UPSERT',
                'ResourceRecordSet': cname_record
            }
        ]
    }
)

print('CNAME record updated successfully.')

Make sure to replace 'yourdomain.com' with your actual domain name and 'your-cloudfront-distribution-domain.com' with the domain name of your CloudFront distribution.

By following these steps, you can remediate the misconfiguration of an AWS CloudFront distribution CNAME record having no S3 origin using Python and AWS Route53.

Using Terraform

# Route 53 CNAME record scheduled for deletion
# SUBSTITUTE VALUES:
# - HOSTED_ZONE_ID: the ID of the hosted zone containing the dangling CNAME
# - RECORD_NAME: the full DNS name of the CNAME record (e.g., "app.example.com.")
# - RECORD_VALUE: the current CNAME target (e.g., "dxxxxx.cloudfront.net.")
# - RECORD_TTL: the current TTL value (e.g., 300)

resource "aws_route53_record" "DANGLING_CLOUDFRONT_CNAME" {
  zone_id = "HOSTED_ZONE_ID"
  name    = "RECORD_NAME"
  type    = "CNAME"
  ttl     = RECORD_TTL

  records = [
    "RECORD_VALUE",
  ]
}

To perform the same remediation as the CLI (permanently deleting this DNS record), remove this aws_route53_record "DANGLING_CLOUDFRONT_CNAME" resource from your Terraform configuration and run terraform apply; Terraform will then destroy the CNAME record in Route 53.

WARNING: Deleting this resource will permanently remove the DNS record and can cause an outage if the domain is still in active use. Verify the record is safe to delete before applying.

Verification: terraform plan should show the CNAME resource with an action of - destroy and no replacement being created for the same name in the same hosted zone.

Triage and Remediation​

Remediation​

Triage and Remediation

Remediation