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[Full-disclosure] eTransfer Lite v1.0 iOS - Persistent Filename Vulnerability

Title:
======
eTransfer Lite v1.0 iOS - Persistent Filename Vulnerability


Date:
=====
2013-08-31


References:
===========
http://www.vulnerability-lab.com/get_content.php?id=1064


VL-ID:
=====
1064


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


Introduction:
=============
eTransfer is a tool for you to transfer photos among pc, iPad. eTransfer does 
not need iTunes. It supports to transfer photo:

- iPad to iPad
- iPad to PC
- PC to iPad

eTransfer does not need extra software. All you need is the device that 
installed eTransfer and web browser on any os.

(Copy of the Homepage: 
https://itunes.apple.com/de/app/etransfer-lite-for-ipad/id492163598 )


Abstract:
=========
The Vulnerability Laboratory Research Team discovered a persistent web 
vulnerability in the eTransfer Lite v1.0 application (Apple iOS - iPad & 
iPhone).


Report-Timeline:
================
2013-08-31:    Public Disclosure (Vulnerability Laboratory)


Status:
========
Published


Affected Products:
==================
Apple AppStore
Product: eTransfer Lite 1.0


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


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


Details:
========
A persistent input validation web vulnerability is detected  in the eTransfer 
Lite v1.0 application (Apple iOS - iPad & iPhone).
The bug allows an attacker (remote) to implement/inject malicious own malicious 
persistent script codes (application side).

The vulnerability is located in the `Receive Photos from others` and `Send 
Photos to others` module of the web-server (http://localhost:8080) 
when processing to request via POST method manipulated `file-names`. The file 
name will be changed to the path value without secure filter, 
encode or parse. The injected script code will be executed in the main file 
listing were the attacker injected earlier the code 
and of course also in the index listing of the mobile web application.

There is a security protection to filter random files because only images are 
allowed. To include own script code the attacker needs 
to manipulate the POST request after the first separate input parse.

Exploitation of the persistent web vulnerability requires low user interaction 
and a local low privilege mobile application account 
with a password. Successful exploitation of the vulnerability can lead to 
persistent session hijacking (customers), account steal 
via persistent web attacks, persistent phishing or persistent module context 
manipulation.

Vulnerable Application(s):
                                [+] eTransfer Lite v1.0 - ITunes or AppStore 
(Apple)

Vulnerable Module(s):
                                [+] File Listing

Vulnerable Parameter(s):
                                [+] file name

Affected Module(s):
                                [+] Index File Dir & Path Listing
                                [+] Path/Folder Listing



Proof of Concept:
=================
The persistent input validation web vulnerability can be exploited by remote 
attackers and local privileged application user accounts with 
low or medium user interaction. For demonstration or reproduce ...

PoC:

<bq>The following files are hosted live from the iPad's Docs 
folder.</bq><p><b>Images:<br><br></b>
<a href="http://192.168.2.104:8080/%3C[PERSISTENT INJECTED SCRIPT 
CODE!]%3Es2.png"><[PERSISTENT INJECTED SCRIPT CODE!]">s2.png</a>
(    51.8 Kb, 2013-08-25 02:09:25 +0000)<br />
<a href="a2b642e7de.jpg">a2b642e7de.jpg</a>
(   238.0 Kb, 2013-08-25 02:08:13 +0000)<br />
</p><br><br><br><hr><br><br><br><center><form
 action="" method="post" enctype="multipart/form-data" name="form1" 
id="form1"><label>Upload file to iPad  <input type="file" 
name="file" id="file" /></label><label> <input 
type="submit" name="button" id="button" value="Submit" 
/></label></form></center><br><br><br>Powered
 By <a 
href=http://www.kaisatec.com>Kaisatec.com</a></body></html></iframe></a></p></body></html>


Reference(s):
http://localhost:8080/


Solution:
=========
To fix the vulnerability the filename needs to be parsed, escaped or separate 
encoded in the POST method request.
Parse also the affected output listing in the of the filename in the index file 
dir listing and sub category path folder listing.


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


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


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===========
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