Azure App Service Web app does not use the latest .Net Core version

Explanation

Azure App Service web applications developed with the .NET software stack should use the latest available version of .NET to ensure the latest security fixes are in use.

Possible Impact

Outdated .NET could contain open vulnerabilities

Suggested Resolution

Use the latest version of the .NET framework

Insecure Example

The following example will fail the azure-appservice-dotnet-framework-version check.

resource "azurerm_app_service" "bad_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
}

Secure Example

The following example will pass the azure-appservice-dotnet-framework-version check.

resource "azurerm_app_service" "good_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 {
	dotnet_framework_version = "v5.0"
  }
}

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