AnonymousFox

//home/develito/httpdocs/plugins/content/sige/assets/download.php

<?php

/**
 * @copyright
 * @package     Simple Image Gallery Extended - SIGE for Joomla! 3.x
 * @author      Viktor Vogel <admin@kubik-rubik.de>
 * @version     3.4.2-FREE - 2020-12-14
 * @link        https://kubik-rubik.de/sige-simple-image-gallery-extended
 *
 * @license     GNU/GPL
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

// Fast check whether image url variable was transmitted
if ($_GET['img'] == '') {
    exit('No parameters!');
}

$_GET['img'] = str_replace('..', '', htmlspecialchars(urldecode($_GET['img'])));
$image = rawurldecode('../../../..' . $_GET['img']);
$file = basename($image);

$fileExtension = strtolower(pathinfo($file, PATHINFO_EXTENSION));
$allowedExtensions = ['jpg', 'gif', 'png'];

if (in_array($fileExtension, $allowedExtensions)) {
    $size = filesize($image);
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename=' . $file);
    header('Content-Length:' . $size);
    readfile($image);
    exit();
}

exit($file . ' is not an image type!');