WordPress Easy Modal 2.0.17 SQL Injection

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DefenseCode ThunderScan SAST Advisory  
WordPress Easy Modal Plugin  
Multiple Security Vulnerabilities  
  
  
Advisory ID: DC-2017-01-007  
Advisory Title: WordPress Easy Modal Plugin Multiple Vulnerabilities  
Advisory URL: http://www.defensecode.com/advisories.php  
Software: WordPress Easy Modal plugin  
Language: PHP  
Version: 2.0.17 and below  
Vendor Status: Vendor contacted, update released  
Release Date: 2017/08/07  
Risk: Medium  
  
  
  
1. General Overview  
===================  
During the security audit of Easy Modal plugin for WordPress CMS,  
multiple vulnerabilities were discovered using DefenseCode ThunderScan  
application source code security analysis platform.  
  
More information about ThunderScan is available at URL:  
http://www.defensecode.com  
  
  
2. Software Overview  
====================  
According to the plugin developers, Easy Modal is the #1 WordPress  
Popup Plugin. It's advertised as "Make glorious & powerful popups and  
market your content like never before - all in minutes!".  
  
According to wordpress.org, it has more than 20,000 active installs.  
  
Homepage:  
http://wordpress.org/extend/plugins/easy-modal/  
https://easy-modal.com  
  
  
3. Vulnerability Description  
============================  
During the security analysis, ThunderScan discovered SQL injection  
vulnerabilities in Easy Modal WordPress plugin.  
  
The easiest way to reproduce the vulnerability is to visit the  
provided URL while being logged in as administrator or another user  
that is authorized to access the plugin settings page. Users that do  
not have full administrative privileges could abuse the database  
access the vulnerability provides to either escalate their privileges  
or obtain and modify database contents they were not supposed to be  
able to.  
  
The nonce token is required as the URL parameter. Token value is not  
unique for each request, nor per each URL, so if the attacker manages  
to obtain a valid token value, the module could be exposed to attack  
vectors such as Cross Site request forgery (CSRF).  
  
3.1. SQL injection  
Function: $wpdb->query()  
Variables: $_GET['id'], $_GET['ids'], $_GET['modal']  
Sample URL:  
http://vulnerablesite.com/wp-admin/admin.php?page=easy-modal&action=delete&id%5B0%5D=4%20AND%20SLEEP(5)&easy-modal_nonce=xxx  
File: easy-modal\classes\controller\admin\modals.php  
---------  
93 $ids = is_array($_GET['id']) ? $_GET['id'] :  
array($_GET['id']);  
...  
97 $ids = $_GET['ids'];  
...  
101 $ids = $_GET['modal'];  
...  
110 $wpdb->query("UPDATE {$wpdb->prefix}em_modals SET  
is_trash = 1 WHERE id IN (".implode(',', $ids).")");  
---------  
  
3.2. SQL injection  
Function: $wpdb->query()  
Variables: $_GET['id'], $_GET['ids'], $_GET['modal']  
Sample URL:  
http://vulnerablesite.com/wp-admin/admin.php?easy-modal_nonce=xxx&_wp_http_referer=%2Fvulnerablesite.com%2Fwp-admin%2Fadmin.php%3Fpage%3Deasy-modal%26status%3Dtrash&page=easy-modal&action=untrash&paged=1&id[]=2)%20AND%20SLEEP(10)--%20ZpVQ&action2=-1  
File: easy-modal\classes\controller\admin\modals.php  
---------  
123 $ids = is_array($_GET['id']) ? $_GET['id'] :  
array($_GET['id']);  
...  
127 $ids = $_GET['ids'];  
...  
131 $ids = $_GET['modal'];  
...  
140 $wpdb->query("UPDATE {$wpdb->prefix}em_modals SET  
is_trash = 0 WHERE id IN ($ids)");  
---------  
  
4. Solution  
===========  
Vendor resolved the security issues after we reported the  
vulnerability. All users are strongly advised to update WordPress Easy  
Modal plugin to the latest available version.  
  
  
5. Credits  
==========  
Discovered with DefenseCode ThunderScan source code security analyzer  
by Neven Biruski.  
  
  
6. Disclosure Timeline  
======================  
2017/04/04 Vendor contacted  
2017/04/06 Vendor responded  
2017/04/13 Update released  
2017/08/07 Advisory released to the public  
  
  
7. About DefenseCode  
====================  
DefenseCode L.L.C. delivers products and services designed to analyze  
and test web, desktop and mobile applications for security  
vulnerabilities.  
  
DefenseCode ThunderScan is a SAST (Static Application Security  
Testing, WhiteBox Testing) solution for performing extensive security  
audits of application source code. ThunderScan SAST performs fast and  
accurate analyses of large and complex source code projects delivering  
precise results and low false positive rate.  
  
DefenseCode WebScanner is a DAST (Dynamic Application Security  
Testing, BlackBox Testing) solution for comprehensive security audits  
of active web applications. WebScanner will test a website's security  
by carrying out a large number of attacks using the most advanced  
techniques, just as a real attacker would.  
  
Subscribe for free software trial on our website  
http://www.defensecode.com/ .  
  
E-mail: defensecode[at]defensecode.com  
  
Website: http://www.defensecode.com  
Twitter: https://twitter.com/DefenseCode/  
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