Triage and Remediation
Remediation
Using Console
Using Console
To remediate the misconfiguration “Lambda Functions Should Not Allow Cross Account Access” in AWS using the AWS console, follow these steps:
- Sign in to the AWS Management Console.
- Open the AWS Lambda console.
- In the left navigation pane, choose “Functions”.
- Select the Lambda function that you want to remediate.
- Choose the “Permissions” tab.
- Scroll down to the “Resource-based policy” section.
- Click the “Edit” button.
- In the “Policy” editor, remove any statements that allow cross-account access.
- Click the “Save” button to save the updated policy.
- Verify that the updated policy does not allow cross-account access.
Using CLI
Using CLI
To remediate the misconfiguration in AWS, you can follow the below steps:
- Open the AWS CLI on your local machine or EC2 instance.
-
Run the following command to list all the Lambda functions in your AWS account:
- Identify the Lambda function that is allowing cross-account access.
-
Run the following command to update the Lambda function’s resource-based policy to deny cross-account access:
Replace
<function-name>with the name of the Lambda function that is allowing cross-account access, and<statement-id>with the ID of the statement that allows cross-account access. For example: -
Verify that the resource-based policy has been updated by running the following command:
Replace
<function-name>with the name of the Lambda function that you updated. The output should show that the resource-based policy now denies cross-account access. - Repeat steps 4-5 for any other Lambda functions that are allowing cross-account access.
- Once you have updated all the Lambda functions, verify that cross-account access is no longer allowed by attempting to access the Lambda function from a different AWS account.
Using Python
Using Python
To remediate the issue of Lambda functions allowing cross-account access in AWS, you can follow these steps using Python:Replace
- Open the AWS Lambda console.
- Click on the Lambda function that is allowing cross-account access.
- Under the “Configuration” tab, click on “Permissions”.
- Click on the “Remove” button next to the role that is allowing cross-account access.
- Click on the “Add Permission” button.
- Select the “AWS Service” radio button.
- Choose the service that needs access to the Lambda function.
- Choose the “Use a permission policy” option.
- In the policy editor, add the following policy:
<region>, <account-id>, and <function-name> with the appropriate values for your Lambda function.- Click on the “Add” button to save the new permission policy.