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2.1.11 Ensure That Microsoft Defender for DNS Is Set To 'On' (Manual)​

Profile Applicability​

• Level 2

Description​

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

Rationale​

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.

Impact​

Enabling Microsoft Defender for DNS requires enabling Microsoft Defender for your subscription. Both will incur additional charges, with Defender for DNS being a small amount per million queries.

Audit​

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. Review the chosen pricing tier. For the DNS resource type Plan should be set to On.

From Azure CLI​

Ensure the output of the below command is Standard

az security pricing show -n 'DNS' --query 'PrincingTier'

From Azure PowerShell​

Get-AzSecurityPricing --Name 'DNS' | Select-Object Name,PricingTier

Ensure output of PricingTier is Standard

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 Powershell​

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

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

From Azure PowerShell​

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

References​

https://azure.microsoft.com/en-us/pricing/details/defender-for-cloud/
https://docs.microsoft.com/en-us/security/benchmark/azure/baselines/dns-security-baseline
https://docs.microsoft.com/en-us/azure/defender-for-cloud/defender-for-dns-alerts
https://docs.microsoft.com/en-us/azure/defender-for-cloud/enable-enhanced-security
https://docs.microsoft.com/en-us/azure/defender-for-cloud/alerts-overview
https://docs.microsoft.com/en-us/security/benchmark/azure/security-controls-v3-network-security#ns-10-ensure-domain-name-system-dns-security
https://docs.microsoft.com/en-us/security/benchmark/azure/security-controls-v3-logging-threat-detection#lt-1-enable-threat-detection-capabilities