WordPress Plugin Quick Paypal Payments 3.0 - Presistant Cross-Site Scripting

TITLE
=====

Quick Paypal Payments - Persistent Cross Site Scripting Vulnerability


AUTHOR
======

Zy0d0x


BLOG
====

https://zy0d0x.com

DATE
====

10/08/2013

VENDOR
======

Quick Plugins - http://quick-plugins.com/


AFFECTED PRODUCT
================

Quick Paypal Payments  Wordpress Plugin Version 3.0 possibly earlier


VULNERABILITY CLASS
===================

Cross-Site Scripting


DESCRIPTION
===========


Quick Paypal Payments suffers from a persistent Cross-Site Scripting vulnerability due to a lack
of input validation and output sanitization of the "reference" and "amount" paramaters.
Other input fields are also effective to reflective cross site scripting.


PROOF OF CONCEPT
================

Enter the following into the field where Quick Paypal Payments requests a Payment reference.

--- SNIP ---

"><script>alert(String.fromCharCode(90,121,48,100,48,120))</script><

--- SNIP ---

If the message has been sent successfully a alert diolog will apear containing Zy0d0x when an user checks there message in the dashboard.


IMPACT
======

An attacker could potentially hijack session authentication tokes of remote users and leverage the
vulnerability to increase the attack vector to the underlying software and operating system of the victim.


THREAT LEVEL
============

High


STATUS
======

Not Fixed