Julien Rentrop, July 2016

Cross-Site Scripting vulnerability in Google Maps WordPress Plugin

Abstract

A Cross-Site Scripting vulnerability was found in the Google Maps WordPress Plugin. This issue allows an attacker to perform a wide variety of actions, such as stealing users' session tokens, or performing arbitrary actions on their behalf. In order to exploit this issue, the attacker has to lure/force a victim into opening a malicious website/link.

Contact

For feedback or questions about this advisory mail us at sumofpwn at securify.nl

The Summer of Pwnage

This issue has been found during the Summer of Pwnage hacker event, running from July 1-29. A community summer event in which a large group of security bughunters (worldwide) collaborate in a month of security research on Open Source Software (WordPress this time). For fun. The event is hosted by Securify in Amsterdam.

OVE ID

OVE-20160712-0038

Tested versions

This issue was successfully tested on Google Maps WordPress Plugin version 2.1.2.

Fix

This issue is resolved in Google Maps version 2.1.4.

Introduction

The Google Maps WordPress Plugin is a simple and effective tool for rapid creation of individual Google Maps in posts and pages. A Cross-Site Scripting vulnerability was found in the Google Maps WordPress Plugin. This issue allows an attacker to perform a wide variety of actions, such as stealing users' session tokens, or performing arbitrary actions on their behalf. In order to exploit this issue, the attacker has to lure/force a victim into opening a malicious website/link.

Details

This issue exists due to the lack of output encoding on the id URL parameter. The vulnerable code fragment is listed below:

<form action="admin.php?page=hugeitgooglemaps_main&task=edit_cat&id=<?php echo $_GET['id']; ?>" method="post" name="adminform" id="adminform">

Proof of concept

http://<target>/wp-admin/admin.php?page=hugeitgooglemaps_main&task=edit_cat&id=1%22%3E%3Ch3%3EBREAK%3C%2Fh3%3E