    public function install () {
        Session::start();
        System::gZip();
        Theme::install('header');
        Control::handler('install');
        Theme::install('footer');
        System::Zipped();
    }

The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.