Rule: All S3 Buckets Should Log S3 Data Events in CloudTrail
This rule ensures that all S3 buckets are logging S3 data events in CloudTrail for better monitoring and security.
| Rule | All S3 buckets should log S3 data events in CloudTrail |
| Framework | NIST 800-53 Revision 5 |
| Severity | ✔ Medium |
Ensuring S3 Data Event Logging in AWS CloudTrail for NIST 800-53 Revision 5 Compliance
Overview
Compliance with NIST 800-53 Revision 5 requires that organizations monitor, log, and track user activities that could impact data security and privacy. AWS S3 data event logging in CloudTrail helps meet these guidelines by providing detailed records of actions taken on S3 objects.
Rule Description
All S3 Buckets must have CloudTrail data event logging enabled to capture and record all API calls that read or write to the S3 buckets. This configuration allows for real-time and historical auditing, enhances visibility into data access patterns, and enables security threat detection.
Troubleshooting Steps
If S3 data event logging is not enabled, follow these steps:
Check Existing Bucket Policies and CloudTrail Configuration
- 1.Verify if CloudTrail is enabled in the AWS account.
- 2.Check if any of the existing trails are configured to log data events for S3 buckets.
- 3.Confirm that the bucket policy allows CloudTrail to create the necessary logs.
Remediation Steps
Enabling CloudTrail
- 1.Navigate to the CloudTrail console.
- 2.Click on “Create trail”.
- 3.Enter the trail name and configure the trail to apply to all regions (recommended).
- 4.Set up the S3 bucket to store your log files or select an existing bucket.
- 5.Ensure that you set the bucket’s policy to permit CloudTrail to write logs.
Enabling Data Event Logging for S3 Buckets
- 1.In the trail creation process or the selected trail settings, scroll down to “Data events”.
- 2.Click on “Select S3 buckets” and add the S3 buckets for which data event logging is required.
- 3.You have the choice to log read and write data events; however, NIST compliance typically requires both.
- 4.Save the trail configuration.
Necessary AWS CLI Commands
To automate the process or handle it programmatically, you can use the AWS CLI.
Create and Configure CloudTrail for Data Events
aws cloudtrail create-trail --name YourTrailName --s3-bucket-name YourS3BucketName --is-multi-region-trail aws cloudtrail put-event-selectors --trail-name YourTrailName --event-selectors '[ { "ReadWriteType": "All", "IncludeManagementEvents": true, "DataResources": [ { "Type": "AWS::S3::Object", "Values": ["arn:aws:s3:::YourS3BucketName/"] } ] } ]'
Replace
YourTrailNameYourS3BucketNameVerify Data Event Logging
To ensure that data event logging for S3 is active:
aws cloudtrail get-event-selectors --trail-name YourTrailName
Summary
Implementing S3 data event logging in CloudTrail for compliance with NIST 800-53 Revision 5 requires careful setup and verification of data event selectors within CloudTrail. Ensure all S3 buckets within the scope of compliance are included in the event selectors, and validate configurations with the AWS CLI as needed.
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