Key Vault should restrict public network access

High Azure General keyvault-no-public-access

Applies to

Microsoft.KeyVault/vaults

What CGPulse checks

A resource passes this rule when networkAcls.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: Key Vault > Networking > set Default action to Deny. See: https://learn.microsoft.com/en-us/azure/key-vault/general/network-security

Careful: Disabling public access blocks all connections not routed through private endpoints or VNet

CLI

az keyvault update --ids "{id}" --default-action Deny

Terraform

resource "azurerm_key_vault" "{name}" {
  name                       = "{name}"
  resource_group_name        = "{rg}"
  location                   = var.location
  tenant_id                  = data.azurerm_client_config.current.tenant_id
  sku_name                   = "standard"
  network_acls {
    default_action = "Deny"
    bypass         = "AzureServices"
  }
}

Compliance frameworks

Vendor documentation

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