A company has a VPC that has no internet access and has the private DNS hostnames option enabled. An Amazon Aurora database is running inside the VPC. A security engineer wants to use AWS Secrets Manager to automatically rotate the credentials for the Aurora database The security engineer configures the Secrets Manager default AWS Lambda rotation function to run inside the same VPC that the Aurora database uses. However, the security engineer determines that the password cannot be rotated properly because the Lambda function cannot communicate with the Secrets Manager endpoint.
What is the MOST secure way that the security engineer can give the Lambda function the ability to communicate with the Secrets Manager endpoint?
In an AWS environment where a VPC has no internet access and requires communication with AWS services such as Secrets Manager, the most secure method is to use an interface VPC endpoint (AWS PrivateLink). This allows private connectivity to services like Secrets Manager, enabling AWS Lambda functions and other resources within the VPC to access Secrets Manager without requiring an internet gateway, NAT gateway, or VPN connection. Interface VPC endpoints are powered by AWS PrivateLink, a technology that enables private connectivity between AWS services using Elastic Network Interfaces (ENI) with private IPs in your VPCs. This option is more secure than creating a NAT gateway because it doesn't expose the resources to the internet and adheres to the principle of least privilege by providing direct access to only the required service.
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