Title:
======
ePhoto Transfer v1.2.1 iOS - Multiple Web Vulnerabilities


Date:
=====
2013-07-17


References:
===========
http://www.vulnerability-lab.com/get_content.php?id=1017


VL-ID:
=====
1017


Common Vulnerability Scoring System:
====================================
6.6


Introduction:
=============
ePhoto Transfer lets you quickly transfer photos and videos between your iPhone, iPad, iPod Touch, Mac, PC, and 
even other non-iOS mobile devices via Wi-Fi. It turns your iPhone/iPad/iPod Touch into a USB drive from your PC 
or Mac, then all your photos and videos will be available for drag and drop. You don`t need to install any desktop 
software(even iTunes), so you can use it at home or in office. It also provides useful features to help you organize 
your photos. You can rename photos and videos, sort and search within your camera roll. You can choose which photos 
and videos to share, and set accessing password for the shared files. Transferring photos and videos over Personal 
Hotspot Wi-Fi is fully supported. It`s a universal app, download once, both your iPhone and iPad will have it. 

(Copy of the Vendor Homepage: https://itunes.apple.com/de/app/ephoto-transfer/id643118163 )


Abstract:
=========
The Vulnerability Laboratory Research Team discovered multiple vulnerabilities in the ePhoto Transfer v1.2.1 application (Apple iOS - iPad & iPhone).


Report-Timeline:
================
2013-07-17:    Public Disclosure (Vulnerability Laboratory)


Status:
========
Published


Affected Products:
==================
Apple AppStore
Product: ePhoto Transfer 1.2.1


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


Severity:
=========
High


Details:
========
1.1
A local command/path injection web vulnerability is detected in the ePhoto Transfer v1.2.1 application (Apple iOS - iPad & iPhone).
The vulnerability allows local attackers to inject commands or path request on application -side of the vulnerable module.

The vulnerability is located in the Index File Dir Listing module when processing to display manipulated Photo Picture Folder Names.
Local attackers with physical device access can inject script code to the regular iOs photo application by renameing the visible folders.
The attacker can save the changed foldername and to execute when accessing the index file dir listing module.

Exploitation of the command injection web vulnerability does not require a privilege application user account or user interaction. 
Successful exploitation results in application-side command/path injection to unauthorized access files or to compromise the application 
or mobile device.

Vulnerable Module(s):
				[+] File Dir Index

Vulnerable Parameter(s):
				[+] Photo Album Name > FolderName


1.2
A remote denial of servicce vulnerability is detected in the ePhoto Transfer v1.2.1 application (Apple iOS - iPad & iPhone).
The denial of service vulnerability allows a remote attacker to crash, slow down, block or shutdown the mobile application core.

The vulnerability is located in the upload parameter when processing to request negative large integer values as filename.
The attacker can open the url deletes the name of an exisiting file and includes a large negative integer value. As reaction 
because of the unfiltered input the application crashs. 

Exploitation of the denial of service vulnerability does not require a privilege application user account or user interaction.
Successful exploitation of the vulnerability result in a stable application crash or shutdown.

Vulnerable Module(s):
				[+] Upload Files

Vulnerable Parameter(s):
				[+] upload




1.3
A client side cross site scripting vulnerability is detected in the ePhoto Transfer v1.2.1 application (Apple iOS - iPad & iPhone).
The input validation vulnerability allows remote attackers to manipulate browser requests by client side script code injects in the web application. 

The vulnerability is located in the file download module when processing to request a manipulated download parameter via GET method.
The script code will be executed when the service is redirecting user to the file dir menu listing.

Exploitation of the vulnerability does not require a privilege application user account but low or medium user interaction.
Successful exploitation of the vulnerability results in session hijacking, persistent phishing, persistent malicious external redirect 
and persistent module context manipulation.

Vulnerable Module(s):
				[+] Files Download

Vulnerable Parameter(s):
				[+] download 


Proof of Concept:
=================
1.1 - Local Command/Path Injection Vulnerability
The local command/path inject web vulnerability can be exploited by remote attackers with physical device access and without user interaction. 
For demonstration or reproduce ...

PoC: Index Listing - Foldername
<tbody xmlns="http://www.w3.org/1999/xhtml"><tr><td class="icon"><a href="..">
<img src="/static/backToParent_icon.png"/></a></td><td class="name"><a href="..">Parent Directory</a></td>
<td class="modifieddate"/><td class="size"/><td/></tr><tr><td class="icon"><a><img src="/static/GenericFolderIcon.png"/></a></td>
<td class="name"><a href="/Photos/Misc Backgrounds">Misc Backgrounds</a></td><td class="modifieddate">2013-07-16 19:05</td>
<td class="size">--</td><td class="download"/></tr><tr><td class="icon"><a><img src="/static/GenericFolderIcon.png"/></a></td>
<td class="name">
<a href="/Photos/Sky Lounge>"<>"%20> "<iframe src=a>">Sky Lounge>"<>"%20> "<iframe src=a></a></td>
<td class="modifieddate">2013-07-16 19:05</td><td class="size">
--</td><td class="download"></td></tr><tr><td class="icon"><a><img src="/static/GenericFolderIcon.png"/></a></td><td class="name"><a 

href="/Photos/Aufnahmen">Aufnahmen</a></td><td class="modifieddate">2013-07-16 19:05</td><td class="size">--
</td><td class="download"/></tr></tbody>

Note: The foldername can be changed in the Photo App of iOS. The execution of the command or path request will be in the main index file dir listing.


1.2 - Denial of Service
The remote denial of service vulnerability can be exploited by remote attackers without privilege application user account and also 
without user interaction. For demonstration or reproduce ...


http://localhost:8080/Photos/Misc%20Backgrounds?upload=-99999999

Note: After opening the upload parameter with negative large integer value the service will crash because of a memory corruption.


1.3 - Client Side Cross Site Scripting
The client site cross site scripting web vulnerability can be exploited by remote attackers without application user account and low or 
medium user interaction. For demonstration or reproduce ...

PoC: 
http://localhost:8080/PermissionNotes(PleaseRead).pdf?download=1&download=2+<iframe src=http://www.vuln-lab.com>

Note: To execute the client side script code an existing file is required to request the download parameter.
The pdf file mentioned in the poc is a default file and ever available after the installation of the iOS app.


Solution:
=========
1.1
The first vulnerability can be patched by a secure encoding of the picture and photo folder names.

1.2
The denial of service can be patched by a secure restriction and encode of the upload parameter. 

1.3
The client side cross site scripting web vulnerability can be fixed by encoding of the download parameter when processing to list files.


Risk:
=====
1.1
The security risk of the command injection web vulnerability is estimated as high(-).

1.2
The security risk of the remote denial of service web vulnerability is estimated as medium.

1.3
The security risk of the client side cross site scripting vulnerability is estimated as low(+)|(-)medium.


Credits:
========
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@evolution-sec.com)


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===========
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