Trusted Microsoft services not enabled

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Metadata

Id: 5400f379-a347-4bdd-a032-446465fdcc6f

Cloud Provider: Azure

Platform: Terraform

Severity: Medium

Category: Networking and Firewall

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Description

Trusted Microsoft services should be enabled for Storage Account access to ensure that Azure resources such as Azure Backup, Azure Monitor, and others can securely interact with the Storage Account without exposing it more broadly. When the bypass attribute in azurerm_storage_account or azurerm_storage_account_network_rules does not include "AzureServices", essential Azure services may be denied access, or administrators may compensate by setting overly permissive network rules, increasing the attack surface. To ensure a secure configuration, the storage account should be configured as follows:

network_rules {
  default_action = "Deny"
  bypass         = ["AzureServices"]
}

Failing to enable trusted Microsoft services can hinder platform functionality or lead to weaker network restrictions that unnecessarily expose the storage account to risk.

Compliant Code Examples

resource "azurerm_storage_account" "negative1" {
  name                = "storageaccountname"
  resource_group_name = azurerm_resource_group.example.name

  location                 = azurerm_resource_group.example.location
  account_tier             = "Standard"
  account_replication_type = "LRS"

  network_rules {
    default_action             = "Deny"
	bypass					   = ["AzureServices"]
    ip_rules                   = ["100.0.0.1"]
    virtual_network_subnet_ids = [azurerm_subnet.example.id]
  }

  tags = {
    environment = "staging"
  }
}

resource "azurerm_storage_account_network_rules" "negative2" {
  resource_group_name  = azurerm_resource_group.test.name
  storage_account_name = azurerm_storage_account.test.name

  default_action             = "Allow"
  ip_rules                   = ["127.0.0.1"]
  virtual_network_subnet_ids = [azurerm_subnet.test.id]
  bypass                     = ["Metrics", "AzureServices"]
}

Non-Compliant Code Examples

resource "azurerm_storage_account_network_rules" "positive1" {
  resource_group_name  = azurerm_resource_group.test.name
  storage_account_name = azurerm_storage_account.test.name

  default_action             = "Allow"
  ip_rules                   = ["127.0.0.1"]
  virtual_network_subnet_ids = [azurerm_subnet.test.id]
  bypass                     = ["Metrics"]
}

resource "azurerm_storage_account" "positive2" {
  name                = "storageaccountname"
  resource_group_name = azurerm_resource_group.example.name

  location                 = azurerm_resource_group.example.location
  account_tier             = "Standard"
  account_replication_type = "LRS"

  network_rules {
    default_action             = "Deny"
	bypass					   = ["None"]
    ip_rules                   = ["100.0.0.1"]
    virtual_network_subnet_ids = [azurerm_subnet.example.id]
  }

  tags = {
    environment = "staging"
  }
}