Resource Policy Attachment In Custom EventBus
More Info:
This rule checks if Amazon EventBridge custom event buses have a resource-based policy attached. It ensures that proper access controls are in place for custom event buses to prevent unauthorized access and ensure compliance with security best practices.Risk Level
LowAddress
SecurityCompliance Standards
CBPTriage and Remediation
Remediation
Using Console
Using Console
To remediate the misconfiguration of Resource Policy Attachment in a Custom EventBus for AWS CloudWatch using the AWS Management Console, follow these steps:
- Login to AWS Console: Go to the AWS Management Console (https://aws.amazon.com/console/) and login with your credentials.
- Navigate to CloudWatch: Click on the “Services” dropdown in the top left corner, search for “CloudWatch” in the search bar, and click on “CloudWatch” to open the CloudWatch dashboard.
- Select Event Buses: In the CloudWatch dashboard, locate the “Event Buses” option in the left-hand menu and click on it.
- Select Custom EventBus: Find the Custom EventBus that has the misconfigured Resource Policy Attachment and click on it to select it.
- Edit Resource Policy: Locate the “Event bus policy” section and click on the “Edit policy” button to modify the Resource Policy Attachment.
- Update Resource Policy: In the policy editor, review the existing policy and make necessary changes to ensure that only authorized resources have permission to access the Custom EventBus. You can use the AWS Policy Generator to create a new policy if needed.
- Save Changes: After updating the Resource Policy Attachment, click on the “Save changes” button to apply the new policy to the Custom EventBus.
- Verify Configuration: Once the policy is updated, verify that the Resource Policy Attachment is correctly configured by checking the permissions and access controls for the Custom EventBus.
Using CLI
Using CLI
To remediate the misconfiguration of resource policy attachment in a custom EventBus for AWS CloudWatch using AWS CLI, follow these steps:By following these steps, you can remediate the misconfiguration of resource policy attachment in a custom EventBus for AWS CloudWatch using AWS CLI.
- List the existing Event Buses in your AWS account to identify the custom EventBus that has the misconfigured resource policy. Run the following AWS CLI command:
- Identify the custom EventBus that has the misconfigured resource policy attachment.
-
Remove the existing resource policy attachment from the custom EventBus using the following AWS CLI command. Replace
<event-bus-name>with the name of the custom EventBus identified in step 2:
- Verify that the resource policy attachment has been successfully removed by listing the permissions for the custom EventBus using the following AWS CLI command:
- If the resource policy attachment is successfully removed, you can now add the correct resource policy to the custom EventBus. Create a new resource policy document in JSON format and save it to a file (e.g.,
resource-policy.json). Here is an example of a resource policy that allows CloudWatch events:
- Attach the new resource policy to the custom EventBus using the following AWS CLI command. Replace
<event-bus-name>with the name of the custom EventBus:
- Verify that the new resource policy has been successfully attached to the custom EventBus by listing the permissions for the custom EventBus using the following AWS CLI command:
Using Python
Using Python
To remediate the misconfiguration of a resource policy attachment in a custom EventBus in AWS CloudWatch using Python, you can follow these steps:
- Identify the Misconfigured Resource Policy: First, identify the custom EventBus in CloudWatch that has the misconfigured resource policy attachment. You can use the AWS SDK for Python (Boto3) to list the EventBuses and their associated resource policies.
-
Remove the Misconfigured Resource Policy: Use the
remove_permissionmethod from Boto3 to remove the misconfigured resource policy attachment from the custom EventBus. You will need to specify the EventBus name and the statement ID of the resource policy to be removed. -
Example Python Code:
- Run the Python Script: Execute the Python script on your local machine or in an AWS Lambda function to remove the misconfigured resource policy attachment from the custom EventBus in CloudWatch.
- Verify Remediation: After running the script, verify that the resource policy attachment has been successfully removed from the custom EventBus by listing the EventBuses and checking the resource policies.