terraform.azure.security.azure-scale-set-password.azure-scale-set-password

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Ensure that Virtual machine does not enable password authentication

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Defintion

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rules:
  - id: azure-scale-set-password
    message: Ensure that Virtual machine does not enable password authentication
    patterns:
      - pattern: resource
      - pattern-inside: |
          resource "azurerm_linux_virtual_machine_scale_set" "..." {
          ...
          }
      - pattern-not-inside: |
          resource "azurerm_linux_virtual_machine_scale_set" "..." {
          ...
          disable_password_authentication = true
          ...
          }
    metadata:
      owasp:
        - A05:2017 - Broken Access Control
        - A01:2021 - Broken Access Control
      cwe:
        - "CWE-284: Improper Access Control"
      category: security
      technology:
        - terraform
        - azure
      references:
        - https://owasp.org/Top10/A01_2021-Broken_Access_Control
      subcategory:
        - audit
      likelihood: LOW
      impact: LOW
      confidence: LOW
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
      vulnerability_class:
        - Improper Authorization
    languages:
      - hcl
    severity: WARNING

Examples

azure-scale-set-password.tf

# fail
# ruleid: azure-scale-set-password
resource "azurerm_linux_virtual_machine_scale_set" "example" {
    name                = var.scaleset_name
    resource_group_name = var.resource_group.name
    location            = var.resource_group.location
    sku                 = var.sku
    instances           = var.instance_count
    admin_username      = var.admin_username
    disable_password_authentication = false
    tags = var.common_tags
}

# pass
resource "azurerm_linux_virtual_machine_scale_set" "example" {
    name                = var.scaleset_name
    resource_group_name = var.resource_group.name
    location            = var.resource_group.location
    sku                 = var.sku
    instances           = var.instance_count
    admin_username      = var.admin_username
    disable_password_authentication = true

    admin_ssh_key {
        username   = var.admin_username
        public_key = tls_private_key.new.public_key_pem
    }
    tags = var.common_tags
}