Vulnerability

The code in downloadpdffile.php doesn't do any sanity checks, allowing a remote attacker to download sensitive system files: <?php 2 $file_name = $_GET["fileName"]; 3 $path = $_GET["fileUrl"]; 4 $fullfile = $path.$file_name; 5 if (file_exists('../../uploads/candidate_application_form/'.$file_name)) { 6 header('Pragma: public'); // required 7 header('Expires: 0'); // no cache 8 header('Cache-Control: must-revalidate, post-check=0, pre-check=0'); 9 header('Last-Modified: '.gmdate ('D, d M Y H:i:s', filemtime ('../../uploads/candidate_application_form/'.$file_ name)).' GMT'); 10 header('Cache-Control: private',false); 11 header('Content-Type: '.'application/pdf'); 12 header('Content-Disposition: attachment; filename="'.basename('../../uploads/candidate_application_form/'.$file_ name).'"'); 13 header('Content-Transfer-Encoding: binary'); 14 header('Content-Length: '.filesize('../../uploads/candidate_application_form/'.$file_name)); // provide file size 15 header('Connection: close'); 16 readfile('../../uploads/candidate_application_form/'.$file_name); // push it out 17 exit(); 18 }