App Service without latest Python version

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Metadata

Id: cc4aaa9d-1070-461a-b519-04e00f42db8a

Cloud Provider: Azure

Platform: Terraform

Severity: Low

Category: Best Practices

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Description

It is recommended to specify the latest supported Python version for the python_version attribute in the site_config block of the azurerm_app_service resource. Using outdated Python versions, such as "python_version = \"2.7\"", exposes your application to known security vulnerabilities and prevents access to important features and security updates available in newer releases. To reduce risk, configure the resource with an up-to-date version. For example:

site_config {
  python_version = "3.10"
}

Compliant Code Examples

provider "azurerm" {
  features {}
}

resource "azurerm_resource_group" "example" {
  name     = "example-resources"
  location = "West Europe"
}

resource "azurerm_service_plan" "example" {
  name                = "example"
  resource_group_name = azurerm_resource_group.example.name
  location            = azurerm_resource_group.example.location
  sku_name            = "P1v2"
}

resource "azurerm_linux_web_app" "example3" {
  name                = "example3"
  resource_group_name = azurerm_resource_group.example.name
  location            = azurerm_service_plan.example.location
  service_plan_id     = azurerm_service_plan.example.id

  site_config{
    application_stack{
      python_version = "3.10"
    }    
  }
}

provider "azurerm" {
  features {}
}

resource "azurerm_resource_group" "example" {
  name     = "example-resources"
  location = "West Europe"
}

resource "azurerm_service_plan" "example" {
  name                = "example"
  resource_group_name = azurerm_resource_group.example.name
  location            = azurerm_resource_group.example.location
  sku_name            = "P1v2"
}

resource "azurerm_windows_web_app" "example2" {
  name                = "example2"
  resource_group_name = azurerm_resource_group.example.name
  location            = azurerm_service_plan.example.location
  service_plan_id     = azurerm_service_plan.example.id

   site_config{
    application_stack{
      python_version = "v3.10"
    }    
  }
}

resource "azurerm_app_service" "example1" {
  name                = "example1-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
  
  # SiteConfig block is optional before AzureRM version 3.0 
  site_config {
    dotnet_framework_version = "v4.0"
    scm_type                 = "LocalGit"
    python_version              = "3.10"
  }

  app_settings = {
    "SOME_KEY" = "some-value"
  }

  connection_string {
    name  = "Database"
    type  = "SQLServer"
    value = "Server=some-server.mydomain.com;Integrated Security=SSPI"
  }
}

Non-Compliant Code Examples

provider "azurerm" {
  features {}
}

resource "azurerm_resource_group" "example" {
  name     = "example-resources"
  location = "West Europe"
}

resource "azurerm_service_plan" "example" {
  name                = "example"
  resource_group_name = azurerm_resource_group.example.name
  location            = azurerm_resource_group.example.location
  sku_name            = "P1v2"
}

resource "azurerm_windows_web_app" "example5" {
  name                = "example5"
  resource_group_name = azurerm_resource_group.example.name
  location            = azurerm_service_plan.example.location
  service_plan_id     = azurerm_service_plan.example.id

   site_config{
    application_stack{
      python_version = "v2.7"
    }    
  }
}

provider "azurerm" {
  features {}
}

resource "azurerm_resource_group" "example" {
  name     = "example-resources"
  location = "West Europe"
}

resource "azurerm_service_plan" "example" {
  name                = "example"
  resource_group_name = azurerm_resource_group.example.name
  location            = azurerm_resource_group.example.location
  os_type             = "Linux"
  sku_name            = "P1v2"
}

resource "azurerm_linux_web_app" "example6" {
  name                = "example6"
  resource_group_name = azurerm_resource_group.example.name
  location            = azurerm_service_plan.example.location
  service_plan_id     = azurerm_service_plan.example.id

  site_config{
    application_stack{
      python_version = "2.7"
    }    
  }
}

resource "azurerm_app_service" "example4" {
  name                = "example4-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

  # SiteConfig block is optional before AzureRM version 3.0 
  site_config { 
    dotnet_framework_version = "v4.0"
    scm_type                 = "LocalGit"
    python_version              = "2.7"
  }

  app_settings = {
    "SOME_KEY" = "some-value"
  }

  connection_string {
    name  = "Database"
    type  = "SQLServer"
    value = "Server=some-server.mydomain.com;Integrated Security=SSPI"
  }
}