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List: full-disclosure
Subject: [FD] My.WiFi USB Drive v1.0 iOS - File Include Vulnerability
From: Vulnerability Lab <research () vulnerability-lab ! com>
Date: 2015-09-28 8:15:47
Message-ID: 5608F733.30206 () vulnerability-lab ! com
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Document Title:
===============
My.WiFi USB Drive v1.0 iOS - File Include Vulnerability
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1589
Release Date:
=============
2015-09-24
Vulnerability Laboratory ID (VL-ID):
====================================
1589
Common Vulnerability Scoring System:
====================================
7.1
Product & Service Introduction:
===============================
My WiFi USB drive. 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 Vendor Homepage: \
https://itunes.apple.com/us/app/my.wifi-usb-drive-+-free-pdf/id979512705 )
Abstract Advisory Information:
==============================
The Vulnerability Laboratory Core Research Team discovered a local file include vulnerability \
in the official My.WiFi USB Drive v1.0 iOS mobile web-application.
Vulnerability Disclosure Timeline:
==================================
2015-09-24: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
Jiyeon Lee
Product: My.WiFi USB Drive - iOS Mobile (Web-Application) 1.0
Exploitation Technique:
=======================
Local
Severity Level:
===============
High
Technical Details & Description:
================================
A local file include web vulnerability has been discovered in the official My.WiFi USB Drive \
v1.0 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 Files` module. Remote \
attackers are able to inject own files with malicious `filename` values in the `Upload Files` \
POST method request to compromise the mobile web-application. The local file/path include \
execution occcurs in the index file dir listing of the wifi interface. The attacker is able to \
inject the local file include request by usage of the `wifi interface` in connection with the \
vulnerable upload files POST method request.
Remote attackers are also able to exploit the filename issue in combination with persistent \
injected script codes to execute different malicious attack requests. The attack vector is \
located on the application-side of the wifi service and the request method to inject is POST.
The security risk of the local file include vulnerability is estimated as high with a cvss \
(common vulnerability scoring system) count of 7.1. Exploitation of the local file include web \
vulnerability requires no user interaction or privilege web-application user account. \
Successful exploitation of the local file include vulnerability results in mobile application \
compromise or connected device component compromise.
Request Method(s):
[+] [POST]
Vulnerable Module(s):
[+] Upload Files
Vulnerable Parameter(s):
[+] filename
Affected Module(s):
[+] Index File Dir Listing (http://localhost/)
Proof of Concept (PoC):
=======================
The file include web vulnerability can be exploited by remote attackers without privilege \
web-application user account or user interaction. For security demonstration or to reproduce \
the vulnerability follow the provided information and steps below to continue.
PoC: Source
<tr class="row-file">
<td class="column-icon">
<button type="button" class="btn btn-default btn-xs button-open">
<span class="glyphicon glyphicon-folder-open"></span>
</button>
</td>
<td class="column-name"><p title="Click to rename..."
class="edit">"./[LOCAL FILE INCLUDE VULNERABILITY!]></p></td>
<td class="column-size">
--- PoC Session Logs [POST] ---
13:08:40.079[167ms][total 167ms] Status: 200[OK]
POST http://localhost:8080/upload Load Flags[LOAD_BYPASS_CACHE ] Größe des Inhalts[2] Mime \
Type[application/json] Request Header:
Host[localhost:8080]
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:8080/]
Content-Length[820]
Content-Type[multipart/form-data; boundary=---------------------------20192471318021]
Connection[keep-alive]
Pragma[no-cache]
Cache-Control[no-cache]
POST-Daten:
POST_DATA[-----------------------------20192471318021
Content-Disposition: form-data; name="path"
/
-----------------------------20192471318021
Content-Disposition: form-data; name="files[]"; filename="./[LOCAL FILE INCLUDE \
VULNERABILITY!]2.png"
Content-Type: image/png
---
13:08:42.198[75ms][total 75ms] Status: 200[OK]
GET http://localhost:8080/list?path=%2F[LOCAL FILE INCLUDE VULNERABILITY]2.png Load \
Flags[LOAD_BACKGROUND LOAD_BYPASS_LOCAL_CACHE_IF_BUSY ] Größe des Inhalts[692] Mime \
Type[application/json] Request Header:
Host[localhost:8080]
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:8080/]
Connection[keep-alive]
Response Header:
Server[GCDWebUploader]
Cache-Control[no-cache]
Content-Length[692]
Content-Type[application/json]
Connection[Close]
Date[Tue, 01 Sep 2015 11:17:22 GMT]
Reference(s):
http://localhost:8080/upload
http://localhost:8080/list?path=%2F
Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure validation of the filename value in the upload \
POST method request. Restrict the filename input and disallow special chars. Ensure that not \
multiple file extensions are loaded in the filename value to prevent arbitrary file upload \
attacks. Encode the output in the file dir index list with the vulnerable name value to prevent \
application-side script code injection attacks.
Security Risk:
==============
The security risk of the local file include web vulnerability in the My.WiFi USB Drive app is \
estimated as high. (CVSS 7.1)
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@evolution-sec.com) \
[www.vulnerability-lab.com]
Disclaimer & Information:
=========================
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