Azure Virtual Machines does not utilise Managed Disks misconfiguration detected in code

Rule Details

Cortex AppSec Rule ID	APPSEC2_AZURE_9
Category - Subcategory	Compute - Unsanctioned Resource Or Type
Provider	AZURE
Severity	LOW
Framework	Terraform, Terraform Plan

Impact

Migrate BLOB based VHD's to Managed Disks on Virtual Machines to exploit the default features of this configuration. The features include

. Default Disk Encryption

. Resilience as Microsoft will managed the disk storage and move around if underlying hardware goes faulty

. Reduction of costs over storage accounts + Managed disks are by default encrypted on the underlying hardware so no additional encryption is required for basic protection, it is available if additional encryption is required. + Managed disks are by design more resilient that storage accounts. + For ARM deployed Virtual Machines, Azure Adviser will at some point recommend moving VHD's to managed disks both from a security and cost management perspective.

How to Fix

Resource: azurerm_virtual_machine [source,go]

{ "resource "azurerm_virtual_machine" "virtual_machine_good" { name = "my-vm" location = "location" resource_group_name = "group_name" network_interface_ids = ["1234567"] vm_size = "Standard_DS1_v2"

storage_image_reference { publisher = "Canonical" offer = "UbuntuServer" sku = "16.04-LTS" version = "latest" }

storage_os_disk { name = "myosdisk1" caching = "ReadWrite" create_option = "FromImage" managed_disk_type = "Standard_LRS" }

os_profile { computer_name = "hostname" admin_username = "testadmin" admin_password = "Password1234!" }

os_profile_linux_config { disable_password_authentication = false }

tags = { environment = "staging" }

}

", }