Ensure AWS Lambda function is configured inside a VPC

Risk Level: Medium
Cloud Entity: AWS Lambda
CloudGuard Rule ID: D9.AWS.NET.74
Covered by Spectral: No
Category: Compute

GSL LOGIC

Lambda should have vpc

REMEDIATION

From Portal

1. Open the Functions page of the Lambda console.
2. Choose a function.
3. Choose Configuration and then choose VPC.
4. Under VPC, choose Edit.
5. Choose a VPC, subnets, and security groups.
   Note: To access private resources, connect your function to private subnets. If your function needs internet access, use network address translation (NAT). Connecting a function to a public subnet doesn't give it internet access or a public IP address.
6. Choose Save.

From TF
Set vpc_config terraform property as shown:

resource "aws_lambda_function" "example" {
	...
	vpc_config {
		subnet_ids         = [SUBNET-IDS]
		security_group_ids = [SECURITY-GROUP-IDS]
	}
}

From Command Line
To add vpc configuration to an existing lambda, run:

aws lambda update-function-configuration --function-name FUNCTION-NAME --vpc-config SubnetIds=SUBNET-IDS,SecurityGroupIds=SECURITY-GROUP-IDS

References

1. https://docs.aws.amazon.com/lambda/latest/dg/configuration-vpc.html
2. https://docs.aws.amazon.com/cli/latest/reference/lambda/update-function-configuration.html

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