No CloudWatch alarm for network gateway changes

Severity: Medium
Service: Monitoring and alarms
Check ID: CLOUDWATCH_ALARM_NETWORK_GATEWAY_CHANGES

What this check finds

No metric filter and alarm detect internet gateway attach, detach, or delete events. Gateway changes can expose previously private VPCs to the internet without triggering any alert. CIS v1.4 §4.12.

Passing looks like: CloudWatch alarm for network gateway changes configured.

How to fix it

Create a metric filter covering CreateCustomerGateway, DeleteCustomerGateway, AttachInternetGateway, CreateInternetGateway, DeleteInternetGateway, DetachInternetGateway events.

Compliance controls it is evidence for

A failing result counts against these controls in KloudLytics; a passing one is evidence towards them. How compliance mapping works

Compliance controls mapped to No CloudWatch alarm for network gateway changes
Framework	Controls
CIS AWS Foundations Benchmark v5.0.0	4.12 Ensure changes to network gateways are monitored
NIST SP 800-53 Rev5 (Moderate)	AU-6 Audit Record Review, Analysis, and Reporting SC-7 Boundary Protection SI-4 System Monitoring
NIST Cybersecurity Framework 2.0	PR.IR-01 Networks and environments are protected from unauthorized logical access and usage DE.AE-02 Adverse events are analyzed DE.CM-01 Networks are monitored
ISO/IEC 27001:2022 Annex A	A.8.16 Monitoring activities A.8.20 Networks security

Checked on every scan

KloudLytics runs this check each time it scans a connected AWS account, through a read-only role, and lists every affected resource with its region. On Pro and Business a fix is written for the specific resource rather than the general case above. The exact access it needs

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