Control: 9.7 Ensure that 'PHP version' is currently supported (if in use)

Description

Periodically, older versions of PHP may be deprecated and no longer supported. Using a supported version of PHP 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. From Azure Home open the Portal Menu in the top left.
2. Go to App Services.
3. Click on each App.
4. Under Settings section, click on Configuration.
5. Click on the General settings pane, ensure that for a Stack of PHP the Major Version and Minor Version reflect a currently supported release.

NOTE: No action is required If PHP version is set to Off or is set with an empty value as PHP is not used by your app.

From Azure CLI

List the available PHP runtimes:

az webapp list-runtimes

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

az webapp config set --resource-group <RESOURCE_GROUP_NAME> --name <APP_NAME> [--linux-fx-version <PHP_RUNTIME_VERSION>][--php-version <PHP_VERSION>]

From Powershell

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

Set-AzWebApp -ResourceGroupName <RESOURCE_GROUP_NAME> -Name <APP_NAME> -phpVersion <PHP_VERSION>

NOTE: Currently there is no way to update an existing web app Linux FX Version setting using PowerShell, nor is there a way to create a new web app using PowerShell that configures the PHP runtime in the Linux FX Version setting.

Default Value

The version of PHP is whatever was selected upon App creation.