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Baseado na classificação ocupacional SOC
Exibindo SKILL.md
| name | cis-aws-foundations-5.5 |
| description | Ensure CloudTrail configuration changes are monitored |
| category | cis-monitoring |
| version | 7.0.0 |
| author | cyberstrike-official |
| tags | ["cis","aws","monitoring","cloudwatch","cloudtrail","metric-filters","alarms","cloudtrail-changes"] |
| cis_id | 5.5 |
| cis_benchmark | CIS AWS Foundations Benchmark v7.0.0 |
| tech_stack | ["aws"] |
| cwe_ids | [] |
| chains_with | ["cis-aws-foundations-4.1","cis-aws-foundations-4.2"] |
| prerequisites | [] |
| severity_boost | {} |
Real-time monitoring of API calls can be achieved by directing CloudTrail Logs to CloudWatch Logs or an external Security Information and Event Management (SIEM) environment, and establishing corresponding metric filters and alarms.
It is recommended that a metric filter and alarm be used to detect changes to CloudTrail's configurations.
CloudWatch is an AWS native service that allows you to observe and monitor resources and applications. CloudTrail logs can also be sent to an external Security Information and Event Management (SIEM) environment for monitoring and alerting.
Monitoring changes to CloudTrail's configuration will help ensure sustained visibility into the activities performed in the AWS account.
Ensuring that changes to CloudTrail configurations are monitored enhances security by maintaining the integrity of logging mechanisms. Automated monitoring can provide real-time alerts; however, it may require additional setup and resources to configure and manage these alerts effectively. These steps can be performed manually within a company's existing SIEM platform in cases where CloudTrail logs are monitored outside of the AWS monitoring tools in CloudWatch.
If you are using CloudTrail trails and CloudWatch, perform the following to ensure that there is at least one active multi-region CloudTrail trail with the prescribed metric filters and alarms configured:
aws cloudtrail describe-trails
Identify multi-region CloudTrail trails: Trails with "IsMultiRegionTrail" set to true
Note the value associated with "Name":<trail-name>
Note the <trail-log-group-name> within the value associated with "CloudWatchLogsLogGroupArn"
arn:aws:logs:<region>:<account-id>:log-group:<trail-log-group-name>:*Ensure the identified multi-region CloudTrail trail is active:
aws cloudtrail get-trail-status --name <trail-name>
Ensure IsLogging is set to TRUE
Ensure the identified multi-region CloudTrail trail captures all management events:
aws cloudtrail get-event-selectors --trail-name <trail-name>
IncludeManagementEvents set to true and ReadWriteType set to All<trail-log-group-name> captured in step 1:aws logs describe-metric-filters --log-group-name <trail-log-group-name>
"filterPattern": "{ ($.eventName = CreateTrail) || ($.eventName = UpdateTrail) || ($.eventName = DeleteTrail) || ($.eventName = StartLogging) || ($.eventName = StopLogging) }"
Note the <cloudtrail-cfg-changes-metric> value associated with the filterPattern from step 3.
Get a list of CloudWatch alarms, and filter on the <cloudtrail-cfg-changes-metric> captured in step 4:
aws cloudwatch describe-alarms --query 'MetricAlarms[?MetricName==<cloudtrail-cfg-changes-metric>]'
Note the AlarmActions value; this will provide the SNS topic ARN value.
Ensure there is at least one active subscriber to the SNS topic:
aws sns list-subscriptions-by-topic --topic-arn <sns-topic-arn>
arn:aws:sns:<region>:<account-id>:<sns-topic-name>:<subscription-id>A metric filter exists with the filter pattern matching CloudTrail configuration change events, a CloudWatch alarm is configured for the metric, and the alarm has an active SNS topic with at least one subscriber.
If you are using CloudTrail trails and CloudWatch, perform the following steps to set up the metric filter, alarm, SNS topic, and subscription:
<trail-log-group-name> taken from audit step 1:aws logs put-metric-filter --log-group-name <trail-log-group-name> --filter-name <cloudtrail-cfg-changes-metric> --metric-transformations metricName=<cloudtrail-cfg-changes-metric>,metricNamespace='CISBenchmark',metricValue=1 --filter-pattern '{ ($.eventName = CreateTrail) || ($.eventName = UpdateTrail) || ($.eventName = DeleteTrail) || ($.eventName = StartLogging) || ($.eventName = StopLogging) }'
aws sns create-topic --name <sns-topic-name>
aws sns subscribe --topic-arn <sns-topic-arn> --protocol <sns-protocol> --notification-endpoint <sns-subscription-endpoints>
aws cloudwatch put-metric-alarm --alarm-name <cloudtrail-cfg-changes-alarm> --metric-name <cloudtrail-cfg-changes-metric> --statistic Sum --period 300 --threshold 1 --comparison-operator GreaterThanOrEqualToThreshold --evaluation-periods 1 --namespace 'CISBenchmark' --alarm-actions <sns-topic-arn>
By default, CloudTrail logs configuration change events (e.g., CreateTrail, UpdateTrail, DeleteTrail, StartLogging, StopLogging), but no CloudWatch metric filters or alarms are set up. This means changes are recorded in CloudTrail, yet they are not actively monitored or alerted on unless filters and alarms are manually configured.
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 8.5 Collect Detailed Audit Logs | x | x | |
| v8 | 8.11 Conduct Audit Log Reviews | x | x | |
| v7 | 6.3 Enable Detailed Logging | x | x |
Level 1 | Manual