Azure Firewall should have Threat Intelligence enabled

High Azure General firewall-azure-firewall-threat-intelligence

Applies to

Microsoft.Network/azureFirewalls

What CGPulse checks

A resource passes this rule when threatIntelMode must be one of ["Alert","Deny"]. Anything else is reported as a finding with the evaluated property value attached as evidence.

How to fix it

Enable Threat Intelligence filtering to block traffic to known malicious IPs and domains. In Azure Portal: Firewall > Threat intelligence > set mode to Alert and deny. See: https://learn.microsoft.com/en-us/azure/firewall/threat-intel

CLI

az network firewall update --ids "{id}" --threat-intel-mode Deny

Terraform

resource "azurerm_firewall" "{name}" {
  name                = "{name}"
  resource_group_name = "{rg}"
  location            = var.location
  sku_name            = "AZFW_VNet"
  sku_tier            = "Standard"
  threat_intel_mode   = "Deny"
  ip_configuration {
    name                 = "fw-ipconfig"
    subnet_id            = "<firewall-subnet-id>"
    public_ip_address_id = "<public-ip-id>"
  }
}

Compliance frameworks

Cloud Security BaselineNS-6

Vendor documentation

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