terraform.azure.security.appservice.azure-appservice-detailed-errormessages-enabled.azure-appservice-detailed-errormessages-enabled

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Ensure that App service enables detailed error messages

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Defintion

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rules:
  - id: azure-appservice-detailed-errormessages-enabled
    message: Ensure that App service enables detailed error messages
    patterns:
      - pattern: resource
      - pattern-not-inside: |
          resource "azurerm_app_service" "..." {
          ...
          logs {
            ...
            detailed_error_messages_enabled = true
            ...
          }
          ...
          }
      - pattern-inside: |
          resource "azurerm_app_service" "..." {
          ...
          }
    metadata:
      owasp:
        - A10:2017 - Insufficient Logging & Monitoring
        - A09:2021 - Security Logging and Monitoring Failures
      cwe:
        - "CWE-778: Insufficient Logging"
      category: security
      technology:
        - terraform
        - azure
      references:
        - https://owasp.org/Top10/A09_2021-Security_Logging_and_Monitoring_Failures
      subcategory:
        - vuln
      likelihood: LOW
      impact: LOW
      confidence: MEDIUM
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
      vulnerability_class:
        - Insufficient Logging
    languages:
      - hcl
    severity: WARNING

Examples

azure-appservice-detailed-errormessages-enabled.tf

# fail
# ruleid: azure-appservice-detailed-errormessages-enabled
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 {
    dotnet_framework_version = "v4.0"
    scm_type                 = "LocalGit"
    }

logs {
    application_logs {
        azure_blob_storage {
        level = "warning"
        sas_url = "www.example.com"
        retention_in_days = 4
    }
}
}              

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

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

# fail
# ruleid: azure-appservice-detailed-errormessages-enabled
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 {
    dotnet_framework_version = "v4.0"
    scm_type                 = "LocalGit"
    }

    app_settings = {
    "SOME_KEY" = "some-value"
    }
    
    logs {
    application_logs {
        azure_blob_storage {
        level = "warning"
        sas_url = "www.example.com"
        retention_in_days = 4
    }
}
detailed_error_messages_enabled = false
} 

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

# fail
# ruleid: azure-appservice-detailed-errormessages-enabled
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 {
    dotnet_framework_version = "v4.0"
    scm_type                 = "LocalGit"
    }

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

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

# 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

    logs {
    http_logs {
        retention_in_days = 4
        retention_in_mb = 10
    }
    detailed_error_messages_enabled = true
    }

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

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

# 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

    site_config {
    dotnet_framework_version = "v4.0"
    scm_type                 = "LocalGit"
    }

    logs {
    detailed_error_messages_enabled = true
    }

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

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