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:

1. 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.

2. Open your command-line interface (CLI) and ensure that you have the necessary permissions to make changes to AWS resources.

3. 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.

4. 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.

5. 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.

6. 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.

7. Save the JSON file with the updated configuration.

8. 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.

9. 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.

10. 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.

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

1. Import the required AWS SDK libraries:

import boto3

2. Initialize the AWS Route53 client:

route53_client = boto3.client('route53')

3. 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']

4. 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]

5. 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.