Ensure web app is not remotely debuggable

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Metadata

Id: terraform-azure-remote-debugging-enabled-app-service

Provider: Azure

Platform: Terraform

Severity: High

Category: Insecure Configurations

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Description

Remote debugging in Azure app services creates a direct channel into your application which can be exploited by attackers to access sensitive data, execute arbitrary code, or gain unauthorized system access. When enabled, it significantly expands your attack surface by exposing debugging interfaces that should never be accessible in production environments. To secure your application, ensure remote debugging is explicitly disabled in your Terraform configuration by setting remote_debugging_enabled = [false] in the site_config block, as shown in this secure example: resource "azurerm_app_service" "good_example" { site_config { remote_debugging_enabled = [false] } }.

Compliant Code Examples

resource "azurerm_app_service" "good_example" {
  name                = "good-app-service"
  location            = "East US"
  resource_group_name = "example-rg"
  app_service_plan_id = "example-plan-id"

  site_config {
    remote_debugging_enabled = [false] # ✅ Remote debugging disabled
    min_tls_version          = ["1.2"]
  }
}


resource "azurerm_linux_web_app" "good_example" {
  name                = "good-linux-web-app"
  location            = "East US"
  resource_group_name = "example-rg"
  service_plan_id     = "example-plan-id"

  site_config {
    minimum_tls_version      = ["1.2"]
    remote_debugging_enabled = [false] # ✅ Remote debugging disabled
  }
}

Non-Compliant Code Examples

resource "azurerm_app_service" "bad_example" {
  name                = "bad-app-service"
  location            = "East US"
  resource_group_name = "example-rg"
  app_service_plan_id = "example-plan-id"

  site_config {
    remote_debugging_enabled = [true] # ❌ Remote debugging enabled
    min_tls_version          = ["1.2"]
  }
}

resource "azurerm_linux_function_app" "bad_example" {
  name                = "bad-linux-func-app"
  location            = "East US"
  resource_group_name = "example-rg"
  service_plan_id     = "example-plan-id"

  site_config {
    remote_debugging_enabled = [true] # ❌ Remote debugging enabled
  }
}

resource "azurerm_linux_function_app_slot" "bad_example" {
  name            = "bad-linux-func-app-slot"
  function_app_id = "example-app-service-id"

  site_config {
    remote_debugging_enabled = [true] # ❌ Remote debugging enabled
  }
}


resource "azurerm_linux_web_app_slot" "bad_example" {
  name           = "bad-linux-web-app-slot"
  app_service_id = "example-plan-id"

  site_config {
    minimum_tls_version      = ["1.2"]
    remote_debugging_enabled = [true] # ❌ Remote debugging enabled
  }
}


resource "azurerm_linux_web_app" "bad_example" {
  name                = "bad-linux-web-app"
  location            = "East US"
  resource_group_name = "example-rg"
  service_plan_id     = "example-plan-id"

  site_config {
    minimum_tls_version      = ["1.2"]
    remote_debugging_enabled = [true] # ❌ Remote debugging enabled
  }
}

resource "azurerm_windows_function_app" "bad_example" {
  name                = "bad-windows-func-app"
  location            = "East US"
  resource_group_name = "example-rg"
  service_plan_id     = "example-plan-id"

  site_config {
    remote_debugging_enabled = [true] # ❌ Remote debugging enabled
  }
}

resource "azurerm_windows_function_app_slot" "bad_example" {
  name            = "bad-windows-func-app-slot"
  function_app_id = "example-func-app"

  site_config {
    remote_debugging_enabled = [true] # ❌ Remote debugging enabled
  }
}

resource "azurerm_windows_web_app" "bad_example" {
  name                = "bad-windows-web-app"
  location            = "East US"
  resource_group_name = "example-rg"
  service_plan_id     = "example-plan-id"

  site_config {
    minimum_tls_version      = ["1.2"]
    remote_debugging_enabled = [true] # ❌ Remote debugging enabled
  }
}

resource "azurerm_windows_web_app_slot" "bad_example" {
  name           = "bad-windows-web-app-slot"
  app_service_id = "example-plan-id"

  site_config {
    minimum_tls_version      = ["1.2"]
    remote_debugging_enabled = [true] # ❌ Remote debugging enabled
  }
}