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Version: 4.2.0

How to Find AWS CloudTrail Trails Missing Alarms for Authentication Failures

Monitoring unauthorized API calls will help reveal application errors and may reduce time to detect malicious activity.

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_cloud_trail) and trail_is_multi_region_trail=true and trail_status.is_logging=true with(empty, --> is(aws_cloudwatch_log_group) with(any, --> is(aws_cloudwatch_metric_filter) and filter_pattern~"\s*\$\.eventName\s*=\s*ConsoleLogin.+\$\.errorMessage\s*=\s*\"Failed authentication\"))\s*\$\.eventName\s*=\s*CreateTrail.+\$\.eventName\s*=\s*UpdateTrail.+\$\.eventName\s*=\s*DeleteTrail.+\$\.eventName\s*=\s*StartLogging.+\$\.eventName\s*=\s*StopLogging"))
    ​kind=aws_cloud_trail, ..., region=fixinventory-poweruser
    ​kind=aws_cloud_trail, ..., account=poweruser-team

  2. Pipe the search command into the dump command:

    > search is(aws_cloud_trail) and trail_is_multi_region_trail=true and trail_status.is_logging=true with(empty, --> is(aws_cloudwatch_log_group) with(any, --> is(aws_cloudwatch_metric_filter) and filter_pattern~"\s*\$\.eventName\s*=\s*ConsoleLogin.+\$\.errorMessage\s*=\s*\"Failed authentication\"))\s*\$\.eventName\s*=\s*CreateTrail.+\$\.eventName\s*=\s*UpdateTrail.+\$\.eventName\s*=\s*DeleteTrail.+\$\.eventName\s*=\s*StartLogging.+\$\.eventName\s*=\s*StopLogging")) | dump
    ​reported:
    ​  id: /aws/cloudtrail/123
    ​  name: some-name
    ​  ctime: '2022-12-05T22:53:14Z'
    ​  kind: aws_cloud_trail
    ​  age: 2mo28d

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

Remediation​

Create a metric filter and alarm for unauthorized requests.

note

Please refer to the AWS CloudTrail documentation for details.

Further Reading​