Network Interface should have a Network Security Group attached

High Azure General networkinterfaces-network-interface-network-securi

Applies to

Microsoft.Network/networkInterfaces

What CGPulse checks

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

How to fix it

Attach a Network Security Group to control traffic with security rules. In Azure Portal: NIC > Network Security Group > associate an NSG. See: https://learn.microsoft.com/en-us/azure/virtual-network/network-security-groups-overview

CLI

az network nic update --ids "{id}" --network-security-group "<nsg-id>"

Bicep

resource nic 'Microsoft.Network/networkInterfaces@2024-01-01' = {{
  name: '{name}'
  location: resourceGroup().location
  properties: {{
    ipConfigurations: [
      {{
        name: 'ipconfig1'
        properties: {{
          subnet: {{
            id: subnetId
          }}
        }}
      }}
    ]
    networkSecurityGroup: {{
      id: 'var.nsg_id'
    }}
  }}
}}

Terraform

resource "azurerm_network_interface" "{name}" {
  name                = "{name}"
  resource_group_name = "{rg}"
  location            = var.location
  ip_configuration {
    name                          = "ipconfig1"
    subnet_id                     = var.subnet_id
    private_ip_address_allocation = "Dynamic"
  }
}
resource "azurerm_network_interface_security_group_association" "{name}" {
  network_interface_id      = "{id}"
  network_security_group_id = var.nsg_id
}

Compliance frameworks

Cloud Security: Azure Foundations

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