Control: 9.9 Ensure that 'Java version' is currently supported (if in use)

Description

Periodically, older versions of Java may be deprecated and no longer supported. Using a supported version of Java for app services is recommended to avoid potential unpatched vulnerabilities.

Deprecated and unsupported versions of programming and scripting languages can present vulnerabilities which may not be addressed or may not be addressable.

Remediation

From Azure Portal

1. Login to Azure Portal using https://portal.azure.com.
2. Go to App Services.
3. Click on each App.
4. Under Settings section, click on Configuration.
5. Click on the General settings pane and ensure that for a Stack of Java the Major Version and Minor Version reflect a currently supported release, and that the Java web server version is set to the auto-update option.

NOTE: No action is required if Java version is set to Off, as Java is not used by your app.

From Azure CLI

To see the list of supported runtimes:

az webapp list-runtimes

To set a currently supported Java version for an existing app, run the following command:

az webapp config set --resource-group <RESOURCE_GROUP_NAME> --name <APP_NAME> [--java-version <JAVA_VERSION> --java-container <JAVA_CONTAINER> --java-container-version <JAVA_CONTAINER_VERSION> [--windows-fx-version <JAVA_RUNTIME_VERSION>] [--linux-fx-version <JAVA_RUNTIME_VERSION>]

If creating a new application to use a currently supported version of Java, run the following commands.

To create an app service plan:

az appservice plan create --resource-group <RESOURCE_GROUP_NAME> --name <PLAN_NAME> --location <LOCATION> [--is-linux --number-of-workers <INT> --sku <PRICING_TIER>] [--hyper-v --sku <PRICING_TIER>]

Get the app service plan ID:

az appservice plan list --query "[].{Name:name, ID:id, SKU:sku, Location:location}"

To create a new Java web application using the retrieved app service ID:

az webapp create --resource-group <RESOURCE_GROUP_NAME> --plan <APP_SERVICE_PLAN_ID> --name <app name> [--linux-fx-version <JAVA_RUNTIME_VERSION>] [--windows-fx-version <JAVA_RUNTIME_VERSION>]

From PowerShell

As of this writing, there is no way to update an existing application's SiteConfig or set a new application's SiteConfig settings during creation via PowerShell.

Default Value

The default setting is whichever setting was chosen in the creation of the webapp.