Ensure Routing Tables for VPC Peering are 'Least Access' Rule
This rule ensures that routing tables for VPC peering are set to 'least access' for improved security measures.
| Rule | Ensure routing tables for VPC peering are 'least access' |
| Framework | cis_v130 |
| Severity | ✔ High |
Rule Description:
The rule "cis_v130" mandates that the routing tables for VPC peering connections should follow the principle of "least access." This means that the routing tables should only contain the necessary routes required for the VPC peering connection to function properly. Unnecessary or overly permissive routes should be removed to minimize potential security risks.
Remediation:
To remediate this issue, follow the step-by-step guide below:
Step 1: Identify the VPC Peering Connection
First, identify the VPC peering connection for which you need to ensure the routing tables have least access.
Step 2: Review Existing Routing Tables
Review the existing routing tables associated with the VPC peering connection. Identify any routes that are not essential for the peering connection and need to be removed.
Step 3: Remove Unnecessary Routes
Now, remove the unnecessary routes from the routing tables. This can be done by using the AWS Command Line Interface (CLI) or AWS Management Console based on your preference.
Step 4: Validate Routing Tables
After removing the unnecessary routes, validate the routing tables to ensure they now adhere to the principle of "least access." Confirm that only the required routes for the VPC peering connection remain in the routing tables.
Troubleshooting Steps:
If you encounter any issues during the remediation process, you can follow these troubleshooting steps:
- 1.Verify that you have correctly identified the VPC peering connection you want to work with.
- 2.Double-check the existing routing tables for the VPC peering connection to ensure you are removing the correct routes.
- 3.Verify that you have the necessary permissions to modify routing tables.
- 4.If using the AWS CLI, ensure you have installed and configured it correctly. Double-check your command syntax for removing routes.
Relevant Code:
If you are using the AWS CLI to remove unnecessary routes from the routing tables, you can utilize the following command:
aws ec2 delete-route --route-table-id <route-table-id> --destination-cidr-block <destination-cidr-block>
Replace
<route-table-id><destination-cidr-block>Please note that the actual commands may vary depending on your specific requirements and the AWS CLI version you are using. It is recommended to refer to the official AWS documentation for the most up-to-date and accurate information.
With these steps, you can ensure that your VPC peering connections adhere to the "least access" principle by having routing tables that only contain the necessary routes, reducing potential security risks associated with overly permissive routing.