App Service must use TLS 1.2 or higher

High Azure General webapp-min-tls

Applies to

Microsoft.Web/sites

What CGPulse checks

A resource passes this rule when siteConfig.minTlsVersion must be one of ["1.2","1.3"]. Anything else is reported as a finding with the evaluated property value attached as evidence.

How to fix it

Set minimum TLS version to 1.2 to prevent protocol downgrade attacks. In Azure Portal: App Service > TLS/SSL settings > set Minimum TLS version to 1.2. See: https://learn.microsoft.com/en-us/azure/app-service/configure-ssl-bindings#enforce-tls-versions

CLI

az webapp config set --ids "{id}" --min-tls-version 1.2

Terraform

resource "azurerm_linux_web_app" "{name}" {
  name                = "{name}"
  resource_group_name = "{rg}"
  location            = var.location
  service_plan_id     = azurerm_service_plan.{name}.id
  site_config {
    minimum_tls_version = "1.2"
  }
}

Compliance frameworks

Vendor documentation

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