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How to Find AWS API Gateways Without Authorizers

If no authorizer is defined, anyone can use the service.

info

This security check is part of the CIS Amazon Web Services Benchmarks and is rated severity medium.

Prerequisites​

This guide assumes that you have already installed and configured Fix Inventory to collect your AWS resources.

Directions​

  1. Execute the following search command in Fix Inventory Shell:

    > search is(aws_apigateway_rest_api) with(empty, --> is(aws_apigateway_authorizer))
    ​kind=aws_apigateway_rest_api, ..., region=fixinventory-poweruser
    ​kind=aws_apigateway_rest_api, ..., account=poweruser-team

  2. Pipe the search command into the dump command:

    > search is(aws_apigateway_rest_api) with(empty, --> is(aws_apigateway_authorizer)) | dump
    ​reported:
    ​  id: /aws/apigateway/123
    ​  name: some-name
    ​  ctime: '2022-12-05T22:53:14Z'
    ​  kind: aws_apigateway_rest_api
    ​  age: 2mo28d

    The command output will list the details of all non-compliant aws_apigateway_rest_api resources.

Remediation​

Add a Cognito pool or attach a Lambda function to control access to your API.

note

Please refer to the AWS API Gateway documentation for details.

Further Reading​