Control: 9.3 Ensure web app is using the latest version of TLS encryption

Description

The TLS(Transport Layer Security) protocol secures transmission of data over the internet using standard encryption technology. Encryption should be set with the latest version of TLS. App service allows TLS 1.2 by default, which is the recommended TLS level by industry standards, such as PCI DSS.

It is highly recommended to use the latest TLS 1.2 version for web app secure connections. App service currently allows the web app to set TLS versions 1.0, 1.1 and 1.2.

As default, TLS Version feature will be set to 1.2.

Remediation

From Console

Login to Azure Portal and go to App Services.
Click on each App.
Under Settings section, click on TLS/SSL settings.
Under Protocol Settings, set Minimum TLS Version to 1.2.

From Command Line

To set TLS Version for an existing app, run the following command:

az webapp config set --resource-group <RESOURCE_GROUP_NAME> --name <APP_NAME> --min-tls-version 1.2

Usage

Run the control in your terminal:

powerpipe control run azure_compliance.control.cis_v140_9_3

Snapshot and share results via Turbot Pipes:

powerpipe login
powerpipe control run azure_compliance.control.cis_v140_9_3 --share

SQL

This control uses a named query:

appservice_web_app_latest_tls_version