terraform.azure.security.appservice.azure-appservice-min-tls-version.azure-appservice-min-tls-version

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Ensure web app is using the latest version of TLS encryption

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Defintion

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rules:
  - id: azure-appservice-min-tls-version
    message: Ensure web app is using the latest version of TLS encryption
    patterns:
      - pattern-either:
          - pattern: |
              "1.0"
          - pattern: |
              "1.1"
      - pattern-inside: min_tls_version = ...
      - pattern-inside: |
          $RESOURCE "azurerm_app_service" "..." {
          ...
          }
    metadata:
      owasp:
        - A03:2017 - Sensitive Data Exposure
        - A02:2021 - Cryptographic Failures
      cwe:
        - "CWE-326: Inadequate Encryption Strength"
      category: security
      technology:
        - terraform
        - azure
      references:
        - https://owasp.org/Top10/A02_2021-Cryptographic_Failures
      subcategory:
        - audit
      likelihood: LOW
      impact: MEDIUM
      confidence: MEDIUM
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
      vulnerability_class:
        - Cryptographic Issues
    languages:
      - hcl
    severity: WARNING

Examples

azure-appservice-min-tls-version.tf

# fail
resource "azurerm_app_service" "example" {
  name                = "example-app-service"
  location            = azurerm_resource_group.example.location
  resource_group_name = azurerm_resource_group.example.name
  app_service_plan_id = azurerm_app_service_plan.example.id
  site_config {
    # ruleid: azure-appservice-min-tls-version
    min_tls_version = "1.0"
  }
}

# pass
resource "azurerm_app_service" "example" {
  name                = "example-app-service"
  location            = azurerm_resource_group.example.location
  resource_group_name = azurerm_resource_group.example.name
  app_service_plan_id = azurerm_app_service_plan.example.id
}