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Ensure that object-level logging for read events is enabled for S3 buckets
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| name | cis-aws-foundations-4.9 |
| description | Ensure that object-level logging for read events is enabled for S3 buckets |
| category | cis-logging |
| version | 7.0.0 |
| author | cyberstrike-official |
| tags | ["cis","aws","logging","s3","object-level","cloudtrail","data-events","read"] |
| cis_id | 4.9 |
| cis_benchmark | CIS AWS Foundations Benchmark v7.0.0 |
| tech_stack | ["aws"] |
| cwe_ids | [] |
| chains_with | ["cis-aws-foundations-4.1","cis-aws-foundations-4.8"] |
| prerequisites | [] |
| severity_boost | {} |
S3 object-level API operations, such as GetObject, DeleteObject, and PutObject, are referred to as data events. By default, CloudTrail trails do not log data events, so it is recommended to enable object-level logging for S3 buckets.
Enabling object-level logging will help you meet data compliance requirements within your organization, perform comprehensive security analyses, monitor specific patterns of user behavior in your AWS account, or take immediate actions on any object-level API activity within your S3 buckets using Amazon CloudWatch Events.
Enabling logging for these object-level events may significantly increase the number of events logged and may incur additional costs.
https://console.aws.amazon.com/cloudtrail/.Trails, and then click the name of the trail that you want to examine.General details.Multi-region trail is set to Yes.Data events.Data events and confirm the configuration:advanced event selectors is being used, it should read:Data Events: S3
Log selector template
Log all events
basic event selectors is being used, it should read:Data events: S3
Bucket Name: All current and future S3 buckets
Read: Enabled
describe-trails command to list all trail names:aws cloudtrail describe-trails --region <region-name> --output table --query trailList[*].Name
The command output will be table of the trail names.
For each trail, run the get-trail command to verify it is a multi-regional trail:
aws cloudtrail get-trail --region <region-name> --name <trail-name> \
--query 'Trail.IsMultiRegionTrail'
get-event-selectors command using the name of a trail returned at the previous step and custom query filters to determine if data event logging is configured:aws cloudtrail get-event-selectors --region <region-name> --trail-name <trail-name> --query EventSelectors[*].DataResources[]
get-event-selectors command returns an empty array, data events are not included in the trail's logging configuration; therefore, object-level API operations performed on S3 buckets within your AWS account are not being recorded.--region command parameter, and perform the audit process for other regions.At least one multi-region trail has S3 object-level read event logging enabled for all buckets.
https://console.aws.amazon.com/s3/.buckets and then click the name of the S3 bucket that you want to examine.Properties tab to see the bucket configuration in detail.AWS Cloud Trail data events section, select the trail name for recording activity. You can choose an existing trail or create a new one by clicking the Configure in CloudTrail button or navigating to the CloudTrail console.Data Events check box.S3 from the Data event type drop-down.Log all events from the Log selector template drop-down.object-level data events logging for S3 buckets within your AWS account, run the put-event-selectors command using the name of the trail that you want to reconfigure as identifier:aws cloudtrail put-event-selectors --region <region-name> --trail-name <trail-name> --event-selectors '[{ "ReadWriteType": "ReadOnly", "IncludeManagementEvents":true, "DataResources": [{ "Type": "AWS::S3::Object", "Values": ["arn:aws:s3:::<s3-bucket-name>/"] }] }]'
object-level event trail configuration.["arn:aws:s3"] in the previous command.object-level logging of read events.--region command parameter, and perform the process for the other regions.By default, CloudTrail does not log S3 object-level (data) events; only management events are logged unless explicitly enabled.
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 8.5 Collect Detailed Audit Logs - Configure detailed audit logging for enterprise assets containing sensitive data. Include event source, date, username, timestamp, source addresses, destination addresses, and other useful elements that could assist in a forensic investigation. | x | x | |
| v7 | 6.3 Enable Detailed Logging - Enable system logging to include detailed information such as an event source, date, user, timestamp, source addresses, destination addresses, and other useful elements. | x | x |
Level 2 | Automated