Document Title:
===============
Banco Guayaquil v8.0.0 iOS - Cross Site Web Vulnerability
References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2315
Release Date:
=============
2022-01-21
Vulnerability Laboratory ID (VL-ID):
====================================
2315
Common Vulnerability Scoring System:
====================================
4.6
Vulnerability Class:
====================
Cross Site Scripting - Persistent
Current Estimated Price:
========================
500€ - 1.000€
Product & Service Introduction:
===============================
Official application of Banco Guayaquil to manage your finances your products
with Banco Guayaquil, Make transactions
from your accounts, Pay credit cards, loans and services as well as access your
movements, Deposit checks, Request
checkbooks, block cards, activate or deactivate consumption of the Internet and
much more.
(Copy of the Homepage:https://apps.apple.com/ec/app/banco-guayaquil/id624963066)
Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered a persistent
cross site web vulnerability in the official Banco Guayaquil 8.0.0 mobile ios
app.
Affected Product(s):
====================
Banco de Guayaquil
Product: Banco Guayaquil v8.0.0 - Apple iOS (Web-Application)
Vulnerability Disclosure Timeline:
==================================
2022-01-21: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Exploitation Technique:
=======================
Local
Severity Level:
===============
Medium
Authentication Type:
====================
Restricted Authentication (User Privileges)
User Interaction:
=================
No User Interaction
Disclosure Type:
================
Independent Security Research
Technical Details & Description:
================================
An application-side input validation vulnerability has been discovered in the
official Banco Guayaquil 8.0.0 mobile ios application.
The vulnerability allows a local attacker to inject own script code as payload
to the application-side of the vulnerable service
function or module. The vulnerability is located in the TextBox Name Profile
input. The code executes after input on any review
after the application start. The attack vector of the vulnerability is
persistent and the request method to inject is POST.
Request Method(s):
[+] Import
Vulnerable Module(s):
[+] Add Name
Vulnerable Parameter(s):
[+] TextBox Name Profile
Vulnerable Final(s):
[+] Save Profile
Proof of Concept (PoC):
=======================
The persistent input validation web vulnerability can be exploited by local
attackers with system user account and without user interaction.
For security demonstration or to reproduce the security vulnerability follow
the provided information and steps below to continue.
Manual steps to reproduce the vulnerability ...
1. Install the ios application to your ios device
(https://apps.apple.com/ec/app/banco-guayaquil/id624963066)
2. Add new name as profile with the script code payload in the TextBox Name
input
3. Save Profile via submit
4. Close mobile application to restart
5. Open mobile ios aplication again
6. Now the context executes directly on review without interaction
7. Successful reproduce of the persistent web vulnerability!
Proof of Concept (IMAGES):
https://i.imgur.com/Cc1VFUf.png
https://i.imgur.com/r1HWwrs.png
Proof of Concept (VIDEO):
https://imgur.com/a/lQHt1br
Payload: Cross Site Scripting
Use Breaks JS Context: <object data>,javascript:alert, <img onerror>
text/html;base64,PHNjcmlwdD5hbGVydCgiVnVsbmVyYWJsZSIpOzwvc2NyaXB0Pg
Solution - Fix & Patch:
=======================
The vulnerability can be resolved by a encode and secure parse / escape of the
inputs.
In a second step the output location were the execute occurs needs to be
sanitized.
Security Risk:
==============
The security risk of the persistent validation web vulnerability in the mobile
ios web-application is estimated as medium.
Credits & Authors:
==================
Taurus Omar -https://www.vulnerability-lab.com/show.php?user=TaurusOmar
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=========================
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