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3.9 Ensure 'Allow Azure services on the trusted services list to access this storage account' is Enabled for Storage Account Access (Automated)​

Profile Applicability​

• Level 2

Description​

Some Azure services that interact with storage accounts operate from networks that can't be granted access through network rules. To help this type of service work as intended, allow the set of trusted Azure services to bypass the network rules. These services will then use strong authentication to access the storage account. If the Allow trusted Azure services exception is enabled, the following services are granted access to the storage account: Azure Backup, Azure Site Recovery, Azure DevTest Labs, Azure Event Grid, Azure Event Hubs, Azure Networking, Azure Monitor, and Azure SQL Data Warehouse (when registered in the subscription).

Rationale​

Turning on firewall rules for storage account will block access to incoming requests for data, including from other Azure services. We can re-enable this functionality by enabling "Trusted Azure Services" through networking exceptions.

Impact​

This creates authentication credentials for services that need access to storage resources so that services will no longer need to communicate via network request. There may be a temporary loss of communication as you set each Storage Account. It is recommended to not do this on mission-critical resources during business hours.

Audit​

From Azure Portal​

  1. Go to Storage Accounts
  2. For each storage account, Click on the Networking blade
  3. Click on the Firewalls and virtual networks heading.
  4. Ensure that Enabled from selected virtual networks and IP addresses is selected.
  5. Ensure that Allow Azure services on the trusted services list to access this storage account is checked in Exceptions.

From Azure CLI​

Ensure bypass contains AzureServices

az storage account list --query '[*].networkRuleSet'

From Azure PowerShell​

Connect-AzAccount
Set-AzContext -Subscription <subscription ID>
Get-AzStorageAccountNetworkRuleset -ResourceGroupName <resource group> -Name <storage account name> |Select-Object Bypass

If the resultant output from the above command shows 'NULL', that storage account configuration is out of compliance with this check. If the result of the above command shows 'AzureServices', that storage account configuration is in compliance with this check.

Remediation​

From Azure Portal​

  1. Go to Storage Accounts
  2. For each storage account, Click on the Networking blade
  3. Click on the Firewalls and virtual networks heading.
  4. Ensure that Enabled from selected virtual networks and IP addresses is selected.
  5. Under the 'Exceptions' label, enable check box for Allow Azure services on the trusted services list to access this storage account.
  6. Click Save to apply your changes.

From Azure CLI​

Use the below command to update Azure services.

az storage account update --name <StorageAccountName> --resource-group <resourceGroupName> --bypass AzureServices

References​

https://docs.microsoft.com/en-us/azure/storage/common/storage-network-security
https://docs.microsoft.com/en-us/security/benchmark/azure/security-controls-v3-network-security#ns-2-secure-cloud-services-with-network-controls