AWS Secrets Manager for Lambda

Ensure AWS Secrets manager is configured and being used by Lambda for databases

Description

Lambda functions often have to access a database or other services within your environment.

Rationale

Credentials used to access databases and other AWS Services need to be managed and regularly rotated to keep access into critical systems secure. Keeping any credentials and manually updating the passwords would be cumbersome, but AWS Secrets Manager allows you to manage and rotate passwords.

Impact

Lambda code should be checked for correct configuration to get the credentials from AWS Secrets Manager. This audit and remediation is only to confirm you have the credentials in Secrets manager.

Audit Procedure

Using AWS Console

1. Login to AWS Console using https://console.aws.amazon.com
2. Click All services, click Secrets Manager under Security, Identity and Compliance.
3. Click on Secrets.
4. Review the secrets listed
5. Confirm that the secret required for Lambda functions is included in the list.
6. If it is, review your code and confirm that you are calling the credentials during runtime.
7. If the credentials are not listed refer to the remediation below.
8. Repeat steps 2-7 for all regions used.

Using AWS CLI

N/A - This control is Console-based audit only.

Expected Result

All database credentials used by Lambda functions are stored in AWS Secrets Manager and Lambda code retrieves credentials from Secrets Manager at runtime.

Remediation

Using AWS Console

1. Login to AWS Console using https://console.aws.amazon.com
2. Click All services, click Secrets Manager under Security, Identity and Compliance.
3. Click on Secrets.
4. Click on Store a new secret
5. Select the Secret type
6. Enter the information

For the 3 db types listed enter the credentials and select the database. For other database enter the credentials, select the db type and enter the connection parameters.

For Other type of secret (Lambda) create the keys and values used. - example Username yepyep Password yepyep Choose an encryption key or create a new one. If you add a new key it will take you to the KMS console. Once you create the new key you can then select it here.

7. Click Next
8. Give the secret a name associated with your organization style and lambda
9. Click Next
10. Configure the auto rotation

Rotation schedule leave as default
Select the lambda function you use to rotate the key

11. Click Next
12. Review all the settings
13. Click Store

Using AWS CLI

N/A - This control is Console-based remediation only.

Default Value

AWS Secrets Manager is not configured by default for Lambda functions.

References

1. https://aws.amazon.com/blogs/security/how-to-securely-provide-database-credentials-to-lambda-functions-by-using-aws-secrets-manager/
2. https://docs.aws.amazon.com/lambda/latest/dg/welcome.html

CIS Controls

Profile

Level 1 | Manual