Homepage
About Snyk

CloudWatch log metric filter and alarm are not set for denied connections in VPC flow logs Affecting CloudWatch service in AWS

Severity

0.0
medium
0
10
    Severity Framework
    Snyk CCSS
    Rule category
    Monitoring / Accounts Monitoring

Is your enviroment affected by this misconfiguration?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
    Frameworks
    AWS-Well-Architected HIPAA ISO-27001 NIST-800-53 SOC-2
  • Snyk ID SNYK-CC-00156
  • credit Snyk Research Team
Report a new misconfiguration Found a mistake?

Description

CloudWatch metric filters and alarms should be configured to alert users to rejected connections in VPC flow logs so users can investigate anomalous traffic.

How to fix?

Create an aws_cloudwatch_log_metric_filter and aws_cloudwatch_metric_alarm with an appropriate pattern attribute set for an aws_cloudwatch_log_group and aws_cloudtrail set of resources.

Use the following pattern attribute set:

$version
$account
$eni
$source
$destination
$srcport
$destport="22"
$protocol="6"
$packets
$bytes
$windowstart
$windowend
$action="REJECT"
$flowlogstatus