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[FD] WiFi Drive CR v1.0 iOS - Persistent Filename Dir List Vulnerability

Document Title:
===============
WiFi Drive CR v1.0 iOS - Persistent Filename Dir List Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1595


Release Date:
=============
2015-09-23


Vulnerability Laboratory ID (VL-ID):
====================================
1595


Common Vulnerability Scoring System:
====================================
3.8


Product & Service Introduction:
===============================
Files can be uploaded with any browser. Start the WiFi Drive web server from 
application and connect to it using any browser.
Use the iPod/iPhone`s/iPad`s available disk space to carry any files. Use your 
iPhone as a normal shared network drive!

(Copy of the Homepage: 
https://itunes.apple.com/us/app/wifi-drive-+-cr-my-external/id979129415 )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Core Research Team discovered an application-side 
exception web vulnerability in the official WiFi Drive + CR v1.0 iOS mobile 
web-application.


Vulnerability Disclosure Timeline:
==================================
2015-09-23:     Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
DONG JOO CHO
Product: WiFi Drive + CR - Mobile WiFi (Web-Application) 1.0


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


Severity Level:
===============
Medium


Technical Details & Description:
================================
A persistent input validation web vulnerability has been discovered in the 
official WiFi Drive + CR v1.0 iOS mobile web-application.
The vulnerability allows remote attacker to inject malicious persistent script 
codes to the application-side of the mobile application.

The vulnerability is located in the filename value of the upload files module 
POST method request. Remote attackers can manipulate the 
filename validation in the POST method request to trick the application in an 
execution of script codes via index - exception-handling.
After processing to inject the exception of the file validation occurs and 
redisplays the injected context. Thus results in a final 
application-side post inject vulnerability. The attack vector of the issue is 
located on the application-side and the request method to 
inject the payload is POST.

The security risk of the application-side web vulnerability is estimated as 
medium with a cvss (common vulnerability scoring system) count of 3.6.
Exploitation of the application-side web vulnerability requires no privilege 
web-application user account and only low or medium user interaction.
Successful exploitation of the vulnerabilities results in persistent phishing, 
session hijacking, persistent external redirect to malicious 
sources and application-side manipulation of affected or connected module 
context.

Request Method(s):
                                        [+] POST

Vulnerable Module(s):
                                        [+] Upload Files

Vulnerable Parameter(s):
                                        [+] filename

Affected Module(s):
                                        [+] Index - Exception handling (File 
Validation > Upload)


Proof of Concept (PoC):
=======================
The remote vulnerability can be exploited by remote attackers without privilege 
web-application user account and with low user interaction.
For security demonstration or to reproduce the vulnerability follow the 
provided information and steps below to continue.

PoC: localhost (Index)
<div class="container">
      <div class="page-header">
        <h1>WiFi Drive</h1></div>
      <p>Drag & drop files on this window or use the "Upload Files…" button to 
upload new files.</p>
      <div id="alerts">
      <div class="alert alert-danger alert-dismissable">
        <button type="button" class="close" data-dismiss="alert">×</button>
        <strong>Internal Server Error: </strong>Failed uploading "[PERSISTENT 
SCRIPT CODE INJECT VULNERABILITY!]2.png" to "null"</div>
      <div class="alert alert-danger alert-dismissable">
        <button type="button" class="close" data-dismiss="alert">×</button>
        <strong>Internal Server Error: </strong>Failed uploading "3.png" to 
"null"
      </div>
      <div class="alert alert-danger alert-dismissable">
        <button type="button" class="close" data-dismiss="alert">×</button>
        <strong>Internal Server Error: </strong>Failed uploading "4.png" to 
"null"
      </div>
    </div>
      <div class="btn-toolbar">
        <button type="button" class="btn btn-primary fileinput-button" 
id="upload-file">
          <span class="glyphicon glyphicon-upload"></span> Upload Files…
          <input id="fileupload" name="files[]" multiple="" type="file">
        </button>
        <button type="button" class="btn btn-success" id="create-folder">
          <span class="glyphicon glyphicon-folder-close"></span> Create Folder…
        </button>
        <button type="button" class="btn btn-default" id="reload">
          <span class="glyphicon glyphicon-refresh"></span> Refresh
        </button>
      </div>
      <div style="display: none;" class="panel panel-default uploading">
        <div class="panel-heading">File Uploads in Progress</div>
        <table class="table table-striped"><tbody id="uploads"></tbody></table>
      </div>
      <div class="panel panel-default">
        <div class="panel-heading">
          <ol class="breadcrumb" id="path"></ol>
        </div>
        <table class="table table-striped"><tbody id="listing"></tbody></table>
      </div>
      <p class="footer">WiFi Drive 1.0</p>
    </div>


--- PoC Sessin Logs [POST] ---
Status: 500[Internal Server Error]
POST http://localhost/upload 
Load Flags[LOAD_BYPASS_CACHE  ] Größe des Inhalts[276] Mime Type[text/html]
   Request Header:
      Host[localhost]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:40.0) Gecko/20100101 
Firefox/40.0]
      Accept[application/json, text/javascript, */*; q=0.01]
      Accept-Language[de,en-US;q=0.7,en;q=0.3]
      Accept-Encoding[gzip, deflate]
      X-Requested-With[XMLHttpRequest]
      Referer[http://localhost/]
      Content-Length[826]
      Content-Type[multipart/form-data; 
boundary=---------------------------140892324816617]
      Connection[keep-alive]
      Pragma[no-cache]
      Cache-Control[no-cache]
   POST-Daten:
      POST_DATA[-----------------------------140892324816617
Content-Disposition: form-data; name="path"
null
-----------------------------140892324816617
Content-Disposition: form-data; name="files[]"; filename="[PERSISTENT SCRIPT 
CODE INJECT VULNERABILITY!]2.png"
Content-Type: image/png


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure encode and parse of the 
vulnerability filename value.
Restrict the input and disallow special chars but also prepare to encode the 
output location in the exception that displays the input context.


Security Risk:
==============
The security risk of the persistent input validation web vulnerability in the 
exception-handling of the interface is estimated as medium. (CVSS 3.6


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


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