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List: full-disclosure
Subject: [FD] AirPhoto WebDisk v4.1.0 iOS - Code Execution Vulnerability
From: Vulnerability Lab <research () vulnerability-lab ! com>
Date: 2014-04-23 10:59:07
Message-ID: 53579CFB.6080607 () vulnerability-lab ! com
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Document Title:
===============
AirPhoto WebDisk v4.1.0 iOS - Code Execution Vulnerability
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1258
Release Date:
=============
2014-04-22
Vulnerability Laboratory ID (VL-ID):
====================================
1258
Common Vulnerability Scoring System:
====================================
8.7
Product & Service Introduction:
===============================
WebDisk lets your iphone/ipad become a file website over wi-fi netwrk.You can upload/download \
your document to your iphone/ipad on your pc browser over wi-fi. It is also a document \
viewer.let you direct view your document on your iphone/iphone. You can upload /download file \
to iphone/ipad on your pc browser over wi-fi.
(Copy of the Homepage: https://itunes.apple.com/us/app/webdisk/id546221210 )
Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a local file include web vulnerability in \
the official AirPhoto WebDisk v4.1.0 iOS mobile application.
Vulnerability Disclosure Timeline:
==================================
2014-04-22: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
AirPhoto
Product: WebDisk 4.1.0
Exploitation Technique:
=======================
Remote
Severity Level:
===============
High
Technical Details & Description:
================================
A code execution web vulnerability has been discovered in the official WebDisk (AirPhoto) \
v4.1.0 iOS mobile web-application. The issue allows an attacker to compromise the application \
and connected device components by exploitation of system specific code execution \
vulnerability in the webdisk interface.
The vulnerability is located in the POST method request of the `upload` module. The main index \
provides an upload form which is not encoding the regular inputs. The context can be \
implemented to the upload form and the results is the application-side execution of system \
specific malicious codes. The file itself will not be transfered and the input generates the \
listing context to the index.
The input field of the upload modules executes the input wrong encoded via POST method request \
as filename value. Remote attackers are also able to execute own malicious codes by usage of a \
script code payload in combination with the affected system device values. The execution of \
the code occurs in the main webdisk file dir listing context. The attack vector is on \
application-side and the request method to attack the service is POST. The security risk of \
the remote code execution web vulnerability is estimated as critical with a cvss (common \
vulnerability scoring system) count of 8.7
Exploitation of the remote code execution web vulnerability requires no privileged application \
user account (passwd default blank) or user interaction. Successful exploitation of the code \
execution vulnerability results in mobile application compromise and connected or affected \
device component compromise.
Request Method(s):
[+] POST
Vulnerable Module(s):
[+] upload
Vulnerable Parameter(s):
[+] tdmid > filename
Affected Module(s):
[+] WebDisk File Dir Index Listing [http://localhost:1861]
Proof of Concept (PoC):
=======================
The system specific (php) code execution vulnerability can be exploited by remote attackers \
without required user interaction or privileged web-application user account. For security \
demonstration or to reproduce the critical web vulnerability follow the provided steps and \
information below to continue.
PoC: Exploit
<tr>
<td class="tdleft"><a href=""><img class="imgthum" src="afico/files_txt.png"></a></td>
<td class="tdmid">>"<.;%5Cvar%5Cmobile%5CApplications%[CODE EXECUTION VULNERABILITY!]test2</td>
<td class="tdright">4-22 10:14<br/><br/>
<a href="afdelete.ma?p=%5Cvar%5Cmobile%5CApplications%5CA97714FF-A3BB-4FE3-ACE6-927930900B91%5CDocuments%5C%7C-%7C451476891.txt">delete</a></td></tr>
<tr><td colspan="3" height="1"><hr class="spline" /></td>
</tr>
Vulnerable Source: Upload File - Add [POST]
<form action="afupload.ma?p=%5Cvar%5Cmobile%5CApplications%5CA97714FF-A3BB-4FE3-ACE6-927930900B91%5CDocuments%5C" \
method="post" enctype="multipart/form-data"> <textarea name="txt" class="textInput" \
id="Text1">
Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure encode and parse of the upload form input field.
Secure and filter the upload POST method request to generate a file.
Encode also the vulnerable output name value in the index listing module itself.
Security Risk:
==============
The security risk of the code execution web vulnerability in the webdisk wifi interface is \
estimated as high.
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@evolution-sec.com) \
[www.vulnerability-lab.com]
Disclaimer & Information:
=========================
The information provided in this advisory is provided as it is without any warranty. \
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--
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