File: vendor/sensio/distribution-bundle/Resources/config/security.xml

<?xml version="1.0" ?>

<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">

    <services>
        <service id="sensio_distribution.security_checker" class="SensioLabs\Security\SecurityChecker" />

        <service id="sensio_distribution.security_checker.command" class="SensioLabs\Security\Command\SecurityCheckerCommand">
            <argument type="service" id="sensio_distribution.security_checker" />
            <tag name="console.command" />
        </service>
    </services>
</container>