Virtual Network should have DDoS protection enabled

High Azure General vnet-ddos-protection

Applies to

Microsoft.Network/virtualNetworks

What CGPulse checks

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

How to fix it

Enable DDoS protection to defend against volumetric attacks. In Azure Portal: VNet > DDoS protection > associate with a DDoS Protection Plan. See: https://learn.microsoft.com/en-us/azure/ddos-protection/manage-ddos-protection

CLI

az network vnet update --ids "{id}" --ddos-protection-plan "<ddos-plan-id>" --ddos-protection true

Bicep

param location string = resourceGroup().location

resource ddosPlan 'Microsoft.Network/ddosProtectionPlans@2023-11-01' = {{
  name: '{name}-ddos-plan'
  location: location
}}

resource vnet 'Microsoft.Network/virtualNetworks@2023-11-01' existing = {{
  name: '{name}'
}}
// TODO: Associate the DDoS plan with the VNet by updating the VNet's ddosProtectionPlan property

Terraform

resource "azurerm_network_ddos_protection_plan" "{name}" {
  name                = "{name}-ddos-plan"
  resource_group_name = "{rg}"
  location            = var.location
}
resource "azurerm_virtual_network" "{name}" {
  name                = "{name}"
  resource_group_name = "{rg}"
  location            = var.location
  address_space       = ["10.0.0.0/16"]
  ddos_protection_plan {
    id     = azurerm_network_ddos_protection_plan.{name}.id
    enable = true
  }
}

Compliance frameworks

Cloud Security BaselineNS-5

Vendor documentation

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