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iClassSchedule 1.6 Script Insertion

iClassSchedule 1.6 Script Insertion
Posted May 18, 2015
Authored by Katharina S.L., Vulnerability Laboratory | Site vulnerability-lab.com

iClassSchedule version 1.6 suffers from a script insertion vulnerability.

tags | exploit
SHA-256 | d047f17c7217e693bc5c7eb259b591591c387b4165c900de8fe1190c3e7e22e2

iClassSchedule 1.6 Script Insertion

Change Mirror Download
Document Title:
===============
iClassSchedule 1.6 iOS & Android - Persistent UI Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1494


Release Date:
=============
2015-05-13


Vulnerability Laboratory ID (VL-ID):
====================================
1494


Common Vulnerability Scoring System:
====================================
3.4


Product & Service Introduction:
===============================
Couldn`t you remember your lesson time? If you are a high-school student or a university one, you will be able easily to consult your weekly guide,
using this App on your iPhone. You could choose your sujects following your plan and give them a colour for marking them at the end of the week.

(Copy of the Homepage: https://play.google.com/store/apps/details?id=com.idalmedia.android.timetable&hl=it & https://itunes.apple.com/en/app/orariolezioni/id542313616)


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a persistent input validation vulnerability in the official iClassSchedule v1.6 iOS & Android mobile web-application.


Vulnerability Disclosure Timeline:
==================================
2015-05-13: Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Affected Product(s):
====================
Tel.Net srl
Product: iClassSchedule - iOS & Android Mobile Web Application 1.6 iOS and 4.6 Android


Exploitation Technique:
=======================
Remote


Severity Level:
===============
Medium


Technical Details & Description:
================================
An application-side validation vulnerability has been discovered in the official iClassSchedule v1.6 iOS & Android mobile web-application.
The vulnerability allows an 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 `Aula (name input)` values of the vulnerable `iClass Calender` module. Local attackers are able to manipulate
the `Aula name` input to compromise the `Calender Index` module. The execution point of the script code occurs on the application-side in the
listing module by the manipulated name context field. The Apple iOS and Google Android mobile application versions are affected by the vulnerability.

The security risk of the application-side web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.4.
Exploitation of the application-side web vulnerability requires a privileged web-application user account and low or medium user interaction.
Successful exploitation of the vulnerabilities result in persistent phishing mails, session hijacking, persistent external redirect to malicious
sources and application-side manipulation of affected or connected module context.

Vulnerable Module(s):
[+] Aula

Vulnerable Parameter(s):
[+] name

Affected Module(s):
[+] iClass Calender Events Context (App Index)


Proof of Concept (PoC):
=======================
The persistent input validation web vulnerability can be exploited by local attackers with physical device access and with low user interaction.
For security demonstration or to reproduce the security vulnerability follow the provided information and steps below to continue.

1. Install the mobile application to your iOS or Android device
2. Open the application and add a new entry to the iclass calender index
3. Inject to the Aula name value your own script code (payload) for testings
4. Save the entry and move back to the iclass calender index of the app
5. The code executes because of the wrong encoding in the calender itself.
Note: Export and Exchange of malicious context is possible!
6. Successful reproduce of the security vulnerability!


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse and encode of the vulnerable name value in the iclass calender module.
Restrict the name input and disallow usage of special chars to prevent persistent cross site scripting attacks.


Security Risk:
==============
The security risk of the persistent input validation web vulnerability in the name value is estimated as medium. (CVSS 3.4)


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Katharin S. L. (CH) (research@vulnerability-lab.com) [www.vulnerability-lab.com]


Disclaimer & Information:
=========================
The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed
or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its suppliers are not liable
in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab
or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for
consequential or incidental damages so the foregoing limitation may not apply. We do not approve or encourage anybody to break any vendor licenses,
policies, deface websites, hack into databases or trade with fraud/stolen material.

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