Disable MIME sniffing to prevent preview of invalid (propably harmful) file types

Reported by Yann CAM and Killian CHEVRIER

diff --git a/f.php b/f.php
index 922668f0002d26f09bc356b90eea60ac7d1e75cd..269b10be94725f3395ec739c2e0a614767dbab80 100644 (file)
--- a/f.php
+++ b/f.php
@@ -231,6 +231,7 @@ if (!jirafeau_is_viewable($link['mime_type']) || !$cfg['preview'] || $do_downloa
     header('Content-Disposition: attachment; filename="' . $link['file_name'] . '"');
 } else {
     header('Content-Disposition: filename="' . $link['file_name'] . '"');
     header('Content-Disposition: attachment; filename="' . $link['file_name'] . '"');
 } else {
     header('Content-Disposition: filename="' . $link['file_name'] . '"');

+    header('X-Content-Type-Options: nosniff');

 }
 header('Content-Type: ' . $link['mime_type']);
 if ($cfg['file_hash'] == "md5") {
 }
 header('Content-Type: ' . $link['mime_type']);
 if ($cfg['file_hash'] == "md5") {