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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.

Rationaleโ€‹

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

Impactโ€‹

If your app is written using version-dependent features or libraries, they may not be available on more recent versions. If you wish to update, research the impact thoroughly.

Auditโ€‹

Take note of the currently supported versions of PHP here: https://www.php.net/supported-versions.php

From Azure Consoleโ€‹

  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, as PHP is not used by your web app.

From Azure CLIโ€‹

To check PHP version for an existing app, run the following command:

az webapp config show --resource-group <RESOURCE_GROUP_NAME> --name <APP_NAME> --query "{LinuxFxVersion:linuxFxVersion,PHP_Version:phpVersion}"

The output should return a currently supported version of PHP. Any other version of PHP would be considered a finding.

NOTE: No action is required if the output is empty, as PHP is not used by your app.

From PowerShellโ€‹

$application = Get-AzWebApp -ResourceGroupName <RESOURCE_GROUP_NAME> -Name <APP_NAME> $application.SiteConfig | select-object LinuxFXVersion, phpVersion

The output should return a currently supported version of PHP. Any other version of PHP would be considered a finding.

NOTE: No action is required if the output is empty, as PHP is not used by your app.

From Azure Policyโ€‹

If referencing a digital copy of this Benchmark, clicking a Policy ID will open a link to the associated Policy definition in Azure.

Default Valueโ€‹

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

Referencesโ€‹

  1. https://docs.microsoft.com/en-us/azure/app-service/web-sites-configure#general-settings
  2. https://docs.microsoft.com/en-us/security/benchmark/azure/security-controls-v3-posture-vulnerability-management#pv-7-rapidly-and-automatically-remediate-software-vulnerabilities
  3. https://docs.microsoft.com/en-us/security/benchmark/azure/security-controls-v3-posture-vulnerability-management#pv-3-establish-secure-configurations-for-compute-resources
  4. https://www.php.net/supported-versions.php

Additional Informationโ€‹

Currently supported versions can be confirmed here: https://www.php.net/supported-versions.php