More Info:
Ensure AWS S3 CNAME records are not vulnerableRisk Level
HighAddress
SecurityCompliance Standards
CBPTriage and Remediation
Remediation
Using Console
Using Console
To remediate the vulnerability of AWS S3 CNAME Records, you can follow the steps below using the AWS Management Console:
- Sign in to the AWS Management Console and open the Route 53 service.
- In the Route 53 dashboard, click on “Hosted zones” in the left sidebar.
- Select the hosted zone that contains the misconfigured CNAME record.
- In the hosted zone details, locate the CNAME record that points to the S3 bucket.
- Click on the checkbox next to the CNAME record to select it.
- Click on the “Actions” button above the record list and select “Edit record set” from the dropdown menu.
- In the “Edit record set” dialog box, you will see the CNAME record details.
- Change the value of the “Alias” field to “No” to remove the CNAME alias.
- In the “Value” field, enter the actual endpoint or domain name of the S3 bucket that the CNAME record was pointing to.
- Click on the “Save Record Set” button to save the changes.
Using CLI
Using CLI
To remediate the vulnerability of AWS S3 CNAME Records, you can follow the steps below using AWS CLI:Step 1: Identify the vulnerable CNAME record in AWS Route53:Replace Replace
- Open the AWS Management Console and go to the Route53 service.
- Select the hosted zone where the vulnerable CNAME record is located.
- Identify the CNAME record that is pointing to an S3 bucket.
- Open the AWS Management Console and go to the VPC service.
- Select the VPC where your S3 bucket is located.
- Click on “Endpoints” in the left sidebar.
- Click on “Create Endpoint” and select
com.amazonaws.<region>.s3
as the service name. - Choose the relevant route table and security groups.
- Click on “Create Endpoint” to create the S3 endpoint.
- Open the AWS CLI on your local machine.
- Run the following command to update the CNAME record:
<hosted-zone-id>
with the ID of your hosted zone, <cname-record-name>
with the name of the CNAME record, and <s3-endpoint-domain>
with the domain name of the S3 endpoint you created in Step 2.Step 4: Verify the changes:- Wait for the changes to propagate, which may take a few minutes.
- Use the following command to check the status of the change:
<change-id>
with the ID of the change returned in the previous step.
3. Once the change status is “INSYNC,” the CNAME record has been updated successfully.By following these steps, you can remediate the vulnerability of AWS S3 CNAME Records in AWS Route53 using AWS CLI.Using Python
Using Python
To remediate the vulnerability of AWS S3 CNAME Records in AWS Route53 using Python, follow these steps:
-
Install the required dependencies:
- boto3: AWS SDK for Python
- dnspython: DNS toolkit for Python
-
Import the necessary modules in your Python script:
-
Create a function to check for vulnerable CNAME records:
-
Create a function to fix the vulnerable CNAME records:
Note: Replace
<new_value>
with the desired value for the CNAME record. -
Call the functions with the domain you want to check and fix:
Note: Replace
<your_domain>
with the actual domain name.