Storage account must deny public network access by default

High Azure General storage-no-public-access

Applies to

Microsoft.Storage/storageAccounts

What CGPulse checks

A resource passes this rule when networkRuleSet.defaultAction must equal Deny. Anything else is reported as a finding with the evaluated property value attached as evidence.

How to fix it

Restrict network access by setting default action to Deny and adding allowed networks. In Azure Portal: Storage account > Networking > set Default action to Deny. See: https://learn.microsoft.com/en-us/azure/storage/common/storage-network-security

Careful: Blocks all connections not from allowed IPs/VNets. Add networkAcls.virtualNetworkRules and ipRules before deploying

CLI

az storage account update --ids "{id}" --default-action Deny

Terraform

resource "azurerm_storage_account" "{name}" {
  name                      = "{name}"
  resource_group_name       = "{rg}"
  location                  = var.location
  account_tier              = "Standard"
  account_replication_type  = "LRS"
  network_rules {
    default_action = "Deny"
  }
}

Compliance frameworks

Vendor documentation

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