🛡️ AWS CloudTrail Network Access Control Lists Changes Monitoring is not enabled🟢⚪
- Contextual name: 🛡️ Network Access Control Lists Changes Monitoring is not enabled🟢⚪
- ID:
/ce/ca/aws/cloudtrail/network-access-control-lists-changes-monitoring - Tags:
- Policy Type:
COMPLIANCE_POLICY - Policy Categories:
SECURITY
Similar Policies
- Cloud Conformity: Network ACL Changes Alarm
- Internal:
dec-x-66cf8b15
Similar Internal Rules
| Rule | Policies | Flags |
|---|---|---|
| ✉️ dec-x-66cf8b15 | 1 |
Description
Description
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.
NACLs are used as a stateless packet filter to control ingress and egress traffic for subnets within a VPC. It is recommended that a metric filter and alarm be established for any changes made to NACLs.
Rationale
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 NACLs will help ensure that AWS resources and services are not unintentionally exposed.
Audit
If you are using CloudTrails and CloudWatch, perform the following to ensure that there is at least one active multi-region CloudTrail with prescribed metric filters and alarms configured:
- Identify the log group name configured for use with active multi-region CloudTrail:
... see more
Remediation
Remediation
If you are using CloudTrails and CloudWatch, perform the following to setup the metric filter, alarm, SNS topic, and subscription:
- Create a metric filter based on filter pattern provided which checks for NACL changes and the
<cloudtrail_log_group_name>taken from audit step 1.aws logs put-metric-filter --log-group-name <cloudtrail_log_group_name> --filter-name <nacl_changes_metric> --metric-transformations metricName= <nacl_changes_metric>, metricNamespace='CISBenchmark', metricValue=1 --filter-pattern '{ ($.eventName = CreateNetworkAcl) || ($.eventName = CreateNetworkAclEntry) || ($.eventName = DeleteNetworkAcl) || ($.eventName = DeleteNetworkAclEntry) || ($.eventName = ReplaceNetworkAclEntry) || ($.eventName = ReplaceNetworkAclAssociation) }'Note: You can choose your own metricName and metricNamespace strings. Using the same metricNamespace for all Foundations Benchmark metrics will group them together.
- Create an SNS topic that the alarm will notify:
aws sns create-topic --name <sns_topic_name>
... [see more](remediation.md)