Control: 2.1.11 Ensure That Microsoft Defender for DNS Is Set To 'On'

Description

Microsoft Defender for DNS scans all network traffic exiting from within a subscription.

DNS lookups within a subscription are scanned and compared to a dynamic list of websites that might be potential security threats. These threats could be a result of a security breach within your services, thus scanning for them could prevent a potential security threat from being introduced.

Remediation

From Azure Portal

1. Go to Microsoft Defender for Cloud
2. Select Environment Settings blade
3. Click on the subscription name
4. Select the Defender plans blade
5. On the line in the table for DNS Select On under Plan.
6. Select Save

From Azure CLI

Use the below command to enable Standard pricing tier for App Service

az security pricing create -n 'DNS' --tier 'Standard'

From Powershell

Set-AzSecurityPricing -Name 'DNS' -PricingTier 'Standard'

Default Value

By default, Microsoft Defender for DNS is not enabled.