File Manager v4.2.10 iOS - Code Execution Vulnerability

[Vulnerability Lab <research () vulnerability-lab com>]

Document Title:
===============
File Manager v4.2.10 iOS - Code Execution Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1343


Release Date:
=============
2014-10-21


Vulnerability Laboratory ID (VL-ID):
====================================
1343


Common Vulnerability Scoring System:
====================================
9


Product & Service Introduction:
===============================
Try a file manager that’s unmatched in functionality and reliability. It was created to manage your cloud services like 
GoogleDrive, Dropbox, 
Box, OneDrive, Yandex.Disk, and network services like FTP, SFTP, SMB, WebDAV, DLNA, photo galleries and files on your 
device. Manage all of 
your stored data like sub-folders - copy, move, rename or compress to archive your folders and files. It supports all 
possible archive 
formats: Zip, Rar, 7z, tar, gz, bz2. You can protect your folders and files with a password and view photo, video and 
audio content, as well 
as documents. This application will be a great help for everyday tasks. Copy a folder from one cloud service to any 
other - easy! Quickly move 
a folder from an archive to a cloud service - easy! Copy your gallery to a network or cloud service - easy!

(Copy of the Homepage: https://itunes.apple.com/de/app/file-manager-pro-manage-your/id926125881 )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research team discovered a code execution vulnerability in the official DevelSoftware LTD 
- File Manager v4.2.10 iOS mobile application.


Vulnerability Disclosure Timeline:
==================================
2014-10-21: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
DevelSoftware LTD
Product: File Manager - iOS Mobile Web Application (Wifi) 4.2.10


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


Severity Level:
===============
Critical


Technical Details & Description:
================================
A code execution vulnerability has been discovered in the official DevelSoftware LTD - File Manager v4.2.10 iOS mobile 
application.
The issue allows an attacker to compromise the application and connected device components by exploitation of a system 
specific code 
execution vulnerability in the wifi interface.

The vulnerability is located in the `Create Folder` input field of the index.html wifi web interface. The function 
create the path value 
without any protection or filter mechanism in the GET method request. Remote attackers are able to manipulate the GET 
method request by 
usage of the `createdir?path=` parameter to compromise the application or device. The execution of the code occurs in 
the index.html file 
next to the name output context of the wifi share file dir listing. The attack vector is located on the 
application-side of the mobile app 
and the request method to inject is GET.

The security risk of the remote code execution web vulnerability is estimated as critical with a cvss (common 
vulnerability scoring system) count of 8.8
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):
                                        [+] GET

Vulnerable Module(s):
                                        [+] Create Folder

Vulnerable Parameter(s):
                                        [+] createdir?path=(name)

Affected Module(s):
                                        [+] Wifi Interface (index.html)


Proof of Concept (PoC):
=======================
The code execution vulnerability can be exploited by attackers in the same local wifi without user interaction or pass 
code authorization.
For security demonstration or to reproduce the security vulnerability follow the provided information and steps below 
to continue.

1. Install the mobile app to your local iOS device (iphone or ipad) 
[https://itunes.apple.com/de/app/file-manager-pro-manage-your/id926125881]
2. Start the app and push in the left corner the wifi transfer button
3. Take another device or computer that allows you to access the wifi file transfer interface (localhost:80)
4. Now, inject own code as payload by usage of the create folder input field
Note: The input field requests the path value directly via GET method request without secure parse or encode
5. The code execution occurs directly after the inject in the index.html file of the web interface
6. Successful reproduce of the security vulnerability!


PoC: index.html (Name) [createdir?path=]

   <fieldset class="buttonsFieldset">
            <input disabled="" value="Download Files" class="buttons" id="loadFileButton" 
onclick="loadFileButtonClick()" type="button">
            <input value="Upload Files" class="buttons" id="uploadFilesButton" onclick="uploadFilesButtonClick()" 
type="button">
            <input value="Create Folder" class="buttons" id="createFolderButton" onclick="createFolderButtonClick()" 
type="button">
            <input disabled="" value="Rename" class="buttons" id="renameButton" onclick="renameButtonClick()" 
type="button">
            <input disabled="" value="Delete" class="buttons" id="deleteButton" onclick="deleteButtonClick()" 
type="button">
            <input value="Select All" class="buttons" id="selectAllButton" onclick="selectAllButtonClick()" 
type="button">
            <input value="Deselect All" class="buttons" id="unselectAllButton" onclick="unselectAllButtonClick()" 
type="button">
        </fieldset>
        <div class="separator"></div>
        <div class="fileListTableContainer">
            <table class="table" id="fileListTable"><tbody><tr id="fileListTable_-1" class="header">
<td id="fileListTable_-1_0" class="field">Name</td><td id="fileListTable_-1_1" class="field">Ext</td><td 
id="fileListTable_-1_2" class="field">Size</td></tr>
<tr index="0" id="fileListTable_0" class="row"><td index="0" field="name" id="fileListTable_0_0" class="cell">>-[CODE 
EXECUTION VULNERABILITY!]></td>
<td index="1" field="ext" id="fileListTable_0_1" class="cell">dir</td><td index="2" field="size" id="fileListTable_0_2" 
class="cell"></td></tr>
<tr index="1" id="fileListTable_1" class="row"><td index="0" field="name" id="fileListTable_1_0" 
class="cell">testfolder1</td><td index="1" field="ext" 
id="fileListTable_1_1" class="cell">dir</td><td index="2" field="size" id="fileListTable_1_2" 
class="cell"></td></tr><tr index="2" id="fileListTable_2" 
class="row"><td index="0" field="name" id="fileListTable_2_0" class="cell">testfolder2</td><td index="1" field="ext" 
id="fileListTable_2_1" 
class="cell">dir</td><td index="2" field="size" id="fileListTable_2_2" class="cell"></td></tr></tbody></table></div>


--- PoC Session Logs [GET] ---
Status: 200[OK]
GET http://localhost:80/createdir?path=%2F%3E%22%3C-[CODE EXECUTION VULNERABILITY!];%3E Load Flags[LOAD_BACKGROUND  ] 
Größe des Inhalts[43] Mime Type[application/x-unknown-content-type]
   Request Header:
      Host[localhost:80]
      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://localhost:80/index.html]
      Connection[keep-alive]
   Response Header:
      Connection[Keep-Alive]
      Content-Length[43]
      

Status: 200[OK]
GET http://localhost:80/-[CODE EXECUTION VULNERABILITY]; Load Flags[LOAD_DOCUMENT_URI  ] Größe des Inhalts[-1] Mime 
Type[application/x-unknown-content-type]
   Request Header:
      Host[localhost:80]
      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://localhost:80/index.html]
      Connection[keep-alive]
   Response Header:
      Connection[Close]
      Date[Sun, 19 Oct 2014 16:22:46 GMT]


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure restriction and parse of the create folder input field. Encode also the 
vulnerable name value in the 
index.html file to prevent application-side code execution attacks.


Security Risk:
==============
The security risk of the code execution web vulnerability in the path value is estimated as critical. (CVSS 8.8)


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. Vulnerability Lab disclaims all 
warranties, either 
expressed or implied, including the warranties of merchantability and capability for a particular purpose. 
Vulnerability-Lab or its suppliers 
are not liable in any case of damage, including direct, indirect, incidental, 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.

Domains:    www.vulnerability-lab.com           - www.vuln-lab.com                                      - 
www.evolution-sec.com
Contact:    admin () vulnerability-lab com      - research () vulnerability-lab com                     - admin () 
evolution-sec com
Section:    dev.vulnerability-db.com            - forum.vulnerability-db.com                            - 
magazine.vulnerability-db.com
Social:     twitter.com/#!/vuln_lab             - facebook.com/VulnerabilityLab                         - 
youtube.com/user/vulnerability0lab
Feeds:      vulnerability-lab.com/rss/rss.php   - vulnerability-lab.com/rss/rss_upcoming.php            - 
vulnerability-lab.com/rss/rss_news.php
Programs:   vulnerability-lab.com/submit.php    - vulnerability-lab.com/list-of-bug-bounty-programs.php - 
vulnerability-lab.com/register/

Any modified copy or reproduction, including partially usages, of this file requires authorization from Vulnerability 
Laboratory. Permission to 
electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of other 
media, are reserved by 
Vulnerability-Lab Research Team or its suppliers. All pictures, texts, advisories, source code, videos and other 
information on this website 
is trademark of vulnerability-lab team & the specific authors or managers. To record, list (feed), modify, use or edit 
our material contact 
(admin () vulnerability-lab com or research () vulnerability-lab com) to get a permission.

                                Copyright © 2014 | Vulnerability Laboratory [Evolution Security]


-- 
VULNERABILITY LABORATORY RESEARCH TEAM
DOMAIN: www.vulnerability-lab.com
CONTACT: research () vulnerability-lab com