Detections
Analytics

3.4 Ensure CloudTrail trails are integrated with CloudWatch Logs - 'CloudWatch Log Delivery'

Information

AWS CloudTrail is a web service that records AWS API calls made in a given AWS account. The recorded information includes the identity of the API caller, the time of the API call, the source IP address of the API caller, the request parameters, and the response elements returned by the AWS service. CloudTrail uses Amazon S3 for log file storage and delivery, so log files are stored durably. In addition to capturing CloudTrail logs within a specified S3 bucket for long term analysis, real time analysis can be performed by configuring CloudTrail to send logs to CloudWatch Logs. For a trail that is enabled in all regions in an account, CloudTrail sends log files from all those regions to a CloudWatch Logs log group. It is recommended that CloudTrail logs be sent to CloudWatch Logs.

Note: The intent of this recommendation is to ensure AWS account activity is being captured, monitored, and appropriately alarmed on. CloudWatch Logs is a native way to accomplish this using AWS services but does not preclude the use of an alternate solution.

Rationale:

Sending CloudTrail logs to CloudWatch Logs will facilitate real-time and historic activity logging based on user, API, resource, and IP address, and provides opportunity to establish alarms and notifications for anomalous or sensitivity account activity.

Impact:

Note: By default, CloudWatch Logs will store Logs indefinitely unless a specific retention period is defined for the log group. When choosing the number of days to retain, keep in mind the average days it takes an organization to realize they have been breached is 210 days (at the time of this writing). Since additional time is required to research a breach, a minimum 365 day retention policy allows time for detection and research. You may also wish to archive the logs to a cheaper storage service rather than simply deleting them. See the following AWS resource to manage CloudWatch Logs retention periods:

https://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/SettingLogRetention.html

Solution

Perform the following to establish the prescribed state:
From Console:

Login to the CloudTrail console at https://console.aws.amazon.com/cloudtrail/

Select the Trail the needs to be updated.

Scroll down to CloudWatch Logs

Click Edit

Under CloudWatch Logs click the box Enabled

Under Log Group pick new or select an existing log group

Edit the Log group name to match the CloudTrail or pick the existing CloudWatch Group.

Under IAM Role pick new or select an existing.

Edit the Role name to match the CloudTrail or pick the existing IAM Role.

Click 'Save changes.

From Command Line:

aws cloudtrail update-trail --name <trail_name> --cloudwatch-logs-log-group-arn <cloudtrail_log_group_arn> --cloudwatch-logs-role-arn <cloudtrail_cloudwatchLogs_role_arn>

See Also

https://workbench.cisecurity.org/benchmarks/10599

Item Details

References: CSCv7|6.2, CSCv7|6.5

Plugin: amazon_aws

Control ID: 40ae063437f431c12f584dbb2ba80a68c720b2e8de11d03559ad3c4abe621510