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[FD] AppFish Offline Coder v2.2 iOS - Persistent Software Vulnerability

Document Title:
===============
AppFish Offline Coder v2.2 iOS - Persistent Software Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1252


Release Date:
=============
2014-04-08


Vulnerability Laboratory ID (VL-ID):
====================================
1252


Common Vulnerability Scoring System:
====================================
3.1


Product & Service Introduction:
===============================
Offline coder allows you to enter HTML, CSS, Javascript and PHP code and have 
the output generated immediately. 
You can code completely offline, with the exception of compiling PHP, which 
requires an internet connection. 

- Instant offline processing of HTML, CSS and Javascript within the app.
- Instant processing of PHP code, with an internet connection (3G, 4G or wifi)
- Save and organise an unlimited number of code snippets
- Import snippets from JSFiddle.net
- Debugging of Javascript and PHP
- Jquery 1.7.2 included
- Adjustable window sizes
- Post snippets to JSFiddle to share with others

(Copy of the Homepage: 
https://itunes.apple.com/us/app/offline-coder/id548233375 )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a persistent input 
validation vulnerability in the official AppFish Offline Coder v2.2 iOS mobile 
application.


Vulnerability Disclosure Timeline:
==================================
2014-04-08:     Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
AppFish
Product: Offline Coder - iOS Mobile Application 2.2


Exploitation Technique:
=======================
Local


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


Technical Details & Description:
================================
A persistent input validation web vulnerability has been discovered in the 
official AppFish Offline Coder v2.2 iOS mobile application.
The vulnerability allows local attackers to inject own malicious persistent 
script codes on the application-side of the vulnerable software.

The vulnerability is located in the add `new snippet` function of the `your 
snippets` module. Attackers are able to inject own script codes by usage of the 
vulnerable
add `new snippet` function. The issue affects the `your snippets` module were 
all snippets will be visible in a drop down list by a history. The attack 
vector is 
persistent on the application-side and the injection method is local with 
physical access. The vulnerable input is the `add new snippets` function and 
the execution 
occurs in the `your snippets`. The script code execution occurs on every click 
or add of snippets and not in the editor sandbox context. The security risk of 
the 
persistent web vulnerability is estimated as medium with a cvss (common 
vulnerability scoring system) count of 3.1(+)|(-)3.2.

Exploitation of the persistent vulnerability requires a privileged device user 
account with physical access and low user interaction. Successful exploitation 
of the 
persistent web vulnerability results in  persistent external redirects, 
persistent phishing and persistent manipulation of vulnerable connected or 
affected modules.

Vulnerable Module(s):
                                [+] New Snippet (+)

Vulnerable Parameter(s):
                                [+] snippet name

Affected Module(s):
                                [+] Your Snippets - History Listing (Drop Down)


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

Manual steps to reproduce the vulnerability:
1. Install the mobile application to your ios device (ipad or iphone) - 
https://itunes.apple.com/us/app/offline-coder/id548233375
2. Open the coding client section and on top is the vulnerble add `new snippet` 
input
3. Include your own malicous test payload to the new snippet module input and 
save the settings
4. Now, just click simple the drop down arrow
5. The script code execution occurs with persisten attack vector in the `my 
snippets` item listing on the bottom
6. Successful reproduce of the persistent script code inject via snippets!

Picture(s):
http://www.vulnerability-lab.com/resources/pictures/1252/1.png


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse of the vulnerable `new 
snippet` input field.
Filter and encode also the vulnerable output names in the `my snippets` module.


Security Risk:
==============
The security risk of the persistent input validation web vulnerability is 
estimated as medium.


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri 
(bkm@xxxxxxxxxxxxxxxxx) [www.vulnerability-lab.com]


Disclaimer & Information:
=========================
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