'[FD] ePhone Disk v1.0.2 iOS - Multiple Web Vulnerabilities'

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List:       full-disclosure
Subject:    [FD] ePhone Disk v1.0.2 iOS - Multiple Web Vulnerabilities
From:       Vulnerability Lab <research () vulnerability-lab ! com>
Date:       2014-03-28 12:39:43
Message-ID: 53356D8F.4010609 () vulnerability-lab ! com
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Document Title:
===============
ePhone Disk v1.0.2 iOS - Multiple Web Vulnerabilities

References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1230

Release Date:
=============
2014-03-25

Vulnerability Laboratory ID (VL-ID):
====================================
1230

Common Vulnerability Scoring System:
====================================
6.9

Product & Service Introduction:
===============================
ePhone Disk is lightweight file manager that lets you download, organize, transfer, offline \
read your files.  It provides the most advanced WiFi sharing features in market.

SHARE FILES VIA WIFI
- Access iPhone like a USB drive from computer, simply use Drag and Drop to manage files
- Discover nearby devices, and discoverable by others
- Single tap to connect to nearby devices
- Accessible from any WebDav client

( Copy of the Homepage: https://itunes.apple.com/us/app/ephone-disk-download-share/id621895613 \
)

Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered multiple vulnerabilities in the official \
Easiermobile Inc - ePhone Disk v1.0.2 iOS mobile web-application.

Vulnerability Disclosure Timeline:
==================================
2014-03-25:	Public Disclosure (Vulnerability Laboratory)

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

Affected Product(s):
====================
Easiermobile Inc
Product: ePhone Disk iOS - Download, Share Files via WiFi 1.0.2

Exploitation Technique:
=======================
Local

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

Technical Details & Description:
================================
1.1
A local file include web vulnerability has been discovered in the official Easiermobile Inc - \
ePhone Disk v1.0.2 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 web-application or mobile device.

The web vulnerability is located in the `filename` value of the `Upload file` module. Remote \
attackers are able to inject own files with malicious  `filename` value in the upload POST \
method request to compromise the mobile web-application. The attack vector is persistent and \
the request  method is POST. The local file/path include execution occcurs in the main file dir \
list. 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(+)|(-)6.9.

Exploitation of the local file include web vulnerability requires no user interaction but a \
privileged web-application user account with low user auth.  Successful exploitation of the \
local file include web vulnerability results in mobile application or connected device \
component compromise.

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

Vulnerable Module(s):
				[+] Upload File

Vulnerable Parameter(s):
				[+] filename

Affected Module(s):
				[+] Upload File > Index File Dir List (http://localhost:8080)

1.2
A local command/path injection web vulnerabilities has been discovered in the official \
Easiermobile Inc - ePhone Disk v1.0.2 iOS mobile web-application. A command inject \
vulnerability allows attackers to inject local commands via vulnerable system values to \
compromise the apple mobile iOS application.

The vulnerability is located in the vulnerable `foldername` value of the wifi file dir list \
module. Local attackers are able to inject own malicious  system specific commands or path \
value requests in the vulnerable foldername value. The injection requires a active sync with \
the wifi app stored folders. The execution of the local command inject bug via foldername value \
on sync occurs in the file dir index list of the main upload path. The security risk of  the \
local command/path inject vulnerability is estimated as high with a cvss (common vulnerability \
scoring system) count of 6.3(+)|(-)6.4.

Exploitation of the command/path inject vulnerability requires a low privileged iOS device \
account with restricted access and no user interaction.  Successful exploitation of the \
vulnerability results in unauthorized execution of system specific commands and unauthorized \
path value requests to  compromise the mobile iOS application or the connected device \
components.

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

Vulnerable Parameter(s):
				[+] foldername (path value)

Affected Module(s):
				[+] ./[iPhone]/Sub Category x - File Dir Listing

1.3
A remote denial of service web vulnerability has been discovered in the official Easiermobile \
Inc - ePhone Disk v1.0.2 iOS mobile web-application. A denial of service vulnerability allows \
remote attackers to block, freeze or crash the affected or vulnerable mobile online-service \
application.

The vulnerability is located in the vulnerable `[download]` value of the downloads module. \
Local attackers are able to include tags as download  path value via GET method request. The \
application responds with an unhandled exception and the result is a permanent online-service \
and  application crash. The security risk of the remote denial of service web vulnerability is \
estimated as low(+) with a cvss (common vulnerability  scoring system) count of 1.8(+)|(-)1.9.

Exploitation of the denial of service web vulnerability requires no privileged iOS device \
account but  low user interaction (allow|accept).  Successful exploitation of the DoS \
vulnerability results in unauthorized execution of system specific commands and unauthorized \
path value  requests to compromise the mobile iOS application or the connected device \
components.

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

Vulnerable Parameter(s):
				[+] ?download

Proof of Concept (PoC):
=======================
1.1
The local file include web vulnerability can be exploited by local attackers with low user \
interaction and with low privileged web-interface account. For security demonstration or to \
reproduce the security vulnerability follow the provided information and steps below to \
continue.

PoC: Upload File > Name > [Index File Dir List]

<table xmlns="http://www.w3.org/1999/xhtml"><thead><th class="icon"/><th \
class="name">Name</th><th class="modifieddate">Date Modified</th> <th \
class="size">Size</th><th/></thead><tbody><tr><td class="icon"><a href=".."><img \
src="/static/backToParent_icon.png"/></a></td> <td class="name"><a href="..">Parent \
Directory</a></td><td class="modifieddate"/><td class="size"/><td/></tr><tr><td class="icon"> \
<a href="/iPhone/Downloads/./[LOCAL FILE INCLUDE VULNERABILITY!].png"> <img \
src="/iPhone/Downloads/./[LOCAL FILE INCLUDE VULNERABILITY!].png?thumbnail=1"/></a></td> <td \
class="name"><a href="/iPhone/Downloads/./[LOCAL FILE INCLUDE VULNERABILITY!].png">./[LOCAL \
FILE INCLUDE VULNERABILITY!].png</a></td> <td class="modifieddate">2014-03-19 14:09</td><td \
class="size">538 bytes</td> <td class="download"><a href="/iPhone/Downloads/./[LOCAL FILE \
INCLUDE VULNERABILITY!].png?download=1"> download</a></td></tr></tbody></table>

--- PoC Sesion Logs [POST] ---
Status: 200[OK]
POST http://localhost:8080/iPhone/Downloads?upload=1 Load Flags[LOAD_DOCUMENT_URI  \
LOAD_INITIAL_DOCUMENT_URI  ] Größe des Inhalts[0] Mime Type[text/plain]  Request Header:
      Host[localhost:8080]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:27.0) Gecko/20100101 Firefox/27.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Accept-Language[de-de,de;q=0.8,en-us;q=0.5,en;q=0.3]
      Accept-Encoding[gzip, deflate]
      Referer[http://localhost:8080/iPhone/Downloads]
      Connection[keep-alive]
   POST-Daten:
      POST_DATA[-----------------------------57142047116429
Content-Disposition: form-data; name="file"; filename="./[LOCAL FILE INCLUDE \
                VULNERABILITY!].png"
Content-Type: image/png

1.2
The command inject web vulnerability can be exploited by local attackers with low user \
interaction and low privileged web-application user account. For security demonstration or to \
reproduce the security vulnerability follow the provided information and steps below to \
continue.

PoC: Foldername > Name > [Index File Dir List]

<table xmlns="http://www.w3.org/1999/xhtml"><thead><th class="icon"></th><th \
class="name">Name</th> <th class="modifieddate">Date Modified</th><th \
class="size">Size</th><th/></thead><tbody><tr><td class="icon"> <a><img \
src="/static/GenericFolderIcon.png"/></a></td><td class="name"><a href="/iPhone/[LOCAL COMMAND \
INJECTION VULNERABILITY!]> [LOCAL COMMAND INJECTION VULNERABILITY!]">iPhone/[LOCAL COMMAND \
INJECTION VULNERABILITY!]</a></td><td class="modifieddate">2014-03-19 14:11</td> <td \
class="size">-- </td><td class="download"/></tr></tbody></table>

1.3
The denial of service web vulnerability can be exploited by remote attackers with low user \
interaction (allow|accept). For security demonstration or to reproduce the vulnerability follow \
the provided information and steps below to continue.

PoC:
http://localhost:8080/iPhone/Downloads/[FileName].*?download=[REMOTE DENIAL OF SERVICE \
VULNERABILITY!]

Note: After the accept of the device owner the application permanent crashes.
A encode problem returns with an error which results in a crash via memory corruption.

Solution - Fix & Patch:
=======================
1.1
The first vulnerability can be patched by a secure parse of the filename value in the upload \
file module POST method request. Encode also the output file dir index list with the vulnerable \
filename output value to prevent injection of malicious context.

1.2
The first vulnerability can be patched by a secure parse of the folder name value in the app \
sync module POST method request. Encode also the output file dir index list with the vulnerable \
folder name output value to prevent injection of malicious context.

1.3
Restrict the download value to integer and allocate the memory. Implement an own little \
exception-handling to prevent remote denial of service attacks.

Security Risk:
==============
1.1
The security risk of the local file include vulnerability is estimated as critical.

1.2
The security risk of the local command inject vulnerability via phone foldername sync is \
estimated as high.

1.3
The security risk of the remote denial of service vulnerability is estimated as low(+). 

Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - LariX4 (research@evolution-sec.com) \
[www.vulnerability-lab.com]

Disclaimer & Information:
=========================
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consequential loss of business  profits or special damages, even if Vulnerability-Lab or its \
suppliers have been advised of the possibility of such damages. Some  states do not allow the \
exclusion or limitation of liability for consequential or incidental damages so the foregoing \
limitation  may not apply. We do not approve or encourage anybody to break any vendor licenses, \
policies, deface websites, hack into databases  or trade with fraud/stolen material.

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