Managed Disk should disable public network access

High Azure General disk-no-public-access

Applies to

Microsoft.Compute/disks

What CGPulse checks

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

How to fix it

Disable public network access to prevent unauthorized internet exposure. In Azure Portal: Managed Disk > Networking > set Public network access to Disabled. See: https://learn.microsoft.com/en-us/azure/virtual-machines/disks-enable-private-links-for-import-export-portal

Careful: Disabling public access blocks disk export/import over public network

CLI

az disk update --ids "{id}" --network-access-policy DenyAll

Terraform

resource "azurerm_managed_disk" "{name}" {
  name                   = "{name}"
  resource_group_name    = "{rg}"
  location               = var.location
  storage_account_type   = "Standard_LRS"
  create_option          = "Empty"
  disk_size_gb           = 128
  network_access_policy  = "DenyAll"
}

Compliance frameworks

Cloud Security BaselineNS-2

Vendor documentation

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