Public storage account

Docs > Datadog Security > Code Security > Infrastructure as Code (IaC) Security > IaC Security Rules > Public storage account

Metadata

Id: terraform-azure-public-storage-account

Provider: Azure

Platform: Terraform

Severity: High

Category: Access Control

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Provider Reference

Description

Public Azure storage accounts represent a significant security risk as they potentially expose sensitive data to unauthorized access from the internet. When storage accounts have their default_action set to Allow or include overly permissive IP rules (0.0.0.0/0), attackers can potentially access, exfiltrate, or manipulate stored data including PII, credentials, or business-critical information.

To secure storage accounts, configure network rules with default_action set to Deny and explicitly allow only specific IP addresses or virtual networks that require access. For example:

resource "azurerm_storage_account" "secure_example" {
  // Required properties
  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"
    ip_rules                   = ["100.0.0.1"]  // Only specific IPs, not 0.0.0.0/0
    virtual_network_subnet_ids = [azurerm_subnet.example.id]
  }
}

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"
    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"]
}

resource "azurerm_storage_account" "negative5" {
  name                     = "storageaccountname"
  resource_group_name      = azurerm_resource_group.example.name
  location                 = azurerm_resource_group.example.location
  account_tier             = "Standard"
  account_replication_type = "GRS"

  allow_blob_public_access = false
}

resource "azurerm_storage_account" "negative6" {
  name                     = "storageaccountname"
  resource_group_name      = azurerm_resource_group.example.name
  location                 = azurerm_resource_group.example.location
  account_tier             = "Standard"
  account_replication_type = "GRS"
}

Non-Compliant Code Examples

resource "azurerm_storage_account" "positive1" {
  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"
    ip_rules                   = ["0.0.0.0/0"]
    virtual_network_subnet_ids = [azurerm_subnet.example.id]
  }

  tags = {
    environment = "staging"
  }
}

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             = "Allow"
    virtual_network_subnet_ids = [azurerm_subnet.example.id]
  }

  tags = {
    environment = "staging"
  }
}

resource "azurerm_storage_account_network_rules" "positive3" {
  resource_group_name  = azurerm_resource_group.test.name
  storage_account_name = azurerm_storage_account.test.name

  default_action             = "Allow"
  ip_rules                   = ["0.0.0.0/0"]
  virtual_network_subnet_ids = [azurerm_subnet.test.id]
  bypass                     = ["Metrics"]
}

resource "azurerm_storage_account_network_rules" "positive4" {
  resource_group_name  = azurerm_resource_group.test.name
  storage_account_name = azurerm_storage_account.test.name

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

resource "azurerm_storage_account" "positive5" {
  name                     = "storageaccountname"
  resource_group_name      = azurerm_resource_group.example.name
  location                 = azurerm_resource_group.example.location
  account_tier             = "Standard"
  account_replication_type = "GRS"

  allow_blob_public_access = true
}