Azure Instance Using Basic Authentication

• Query id: dafe30ec-325d-4516-85d1-e8e6776f012c
• Query name: Azure Instance Using Basic Authentication
• Platform: Terraform
• Severity: Medium
• Category: Best Practices
• CWE: 284
• URL: Github

Description

Azure Instances should use SSH Key instead of basic authentication
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - tf file

resource "azurerm_virtual_machine" "positive1" {
  name                  = "${var.prefix}-vm"
  location              = azurerm_resource_group.main.location
  resource_group_name   = azurerm_resource_group.main.name
  network_interface_ids = []
  vm_size               = "Standard_DS1_v2"

  os_profile_linux_config {
    disable_password_authentication = false
  }
}

Positive test num. 2 - tf file

resource "azurerm_linux_virtual_machine" "positive1" {
  name                  = "${var.prefix}-vm"
  location              = azurerm_resource_group.main.location
  resource_group_name   = azurerm_resource_group.main.name
  network_interface_ids = []
  vm_size               = "Standard_DS1_v2"
  disable_password_authentication = false
}

Code samples without security vulnerabilities

Negative test num. 1 - tf file

resource "azurerm_linux_virtual_machine" "negative1" {
  name                  = "${var.prefix}-vm"
  location              = azurerm_resource_group.main.location
  resource_group_name   = azurerm_resource_group.main.name
  network_interface_ids = [azurerm_network_interface.main.id]
  vm_size               = "Standard_DS1_v2"

  admin_ssh_key {
    username   = "adminuser"
    public_key = file("~/.ssh/id_rsa.pub")
  }
}

Negative test num. 2 - tf file

resource "azurerm_virtual_machine" "negative1" {
  name                  = "${var.prefix}-vm"
  location              = azurerm_resource_group.main.location
  resource_group_name   = azurerm_resource_group.main.name
  network_interface_ids = [azurerm_network_interface.main.id]
  vm_size               = "Standard_DS1_v2"

  os_profile_linux_config {
    disable_password_authentication = true
  }

  admin_ssh_key {
    username   = "adminuser"
    public_key = file("~/.ssh/id_rsa.pub")
  }
}