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FileBug v1.5.1 iOS - Path Traversal Web Vulnerability

From: Vulnerability Lab (researchvulnerability-lab.com)
Date: Tue Oct 21 2014 - 07:42:50 CDT


Document Title:
===============
FileBug v1.5.1 iOS - Path Traversal Web Vulnerability

References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1342

Release Date:
=============
2014-10-15

Vulnerability Laboratory ID (VL-ID):
====================================
1342

Common Vulnerability Scoring System:
====================================
5.1

Product & Service Introduction:
===============================
FileBug is a file manager and document viewer for iPhone and iPod touch. You can store and view your documents,
transferring them easily from Mac or PC, reading them anywhere and share with friends. FileBug is so easy to use.
It can catch documents from many source, computer, web sites, email attachments, Dropbox…etc. It provides high
quality view and excellent support for PDF. All files are saved to your device locally and them can be
protected through password.

(Copy of the Homepage: https://itunes.apple.com/de/app/filebug-file-manager-document/id574385365 )

Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a directory traversal vulnerability in the FileBug v1.5.1 iOS mobile application.

Vulnerability Disclosure Timeline:
==================================
2014-10-15: Public Disclosure (Vulnerability Laboratory)

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

Affected Product(s):
====================
Appxy
Product: FileBug - iOS Mobile Web Application (Wifi) 1.5.1 Professional Edition

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

Severity Level:
===============
Medium

Technical Details & Description:
================================
A local directory traversal web vulnerability has been dsicovered in the official FileBug v1.5.1 iOS mobile application.
The security vulnerability allows a local attacker to unauthorized request local files and device system paths.

The issue is located in the filename to path/folder value validation of the wifi interface web-application. The vulnerability
allows a local attackers to inject via filename value in the app by a sync unauthorized local path requests to compromise the
local ios device. The vulnerability is only exploitable by a local app sync without user interaction. The attacker can include
in the app a file or a folder with the local path value to request. After the attacker opened the application context the service
executes the payload in the item dir list of the wifi interface.

The security risk of the local path traversal web vulnerability is estimated as medium with a cvss (common vulnerability scoring
system) count of 5.1. Exploitation of the directory traversal web vulnerability requires no privileged application user account
(passwd default blank) or user interaction. Successful exploitation of the vulnerability results in mobile application compromise
by unauthorized file/path access.

Request Method(s):
                                [+] Sync

Vulnerable Module(s):
                                [+] Add File
                                [+] Add Folder

Vulnerable Parameter(s):
                                [+] filename
                                [+] foldername

Affected Module(s):
                                [+] Files from FileBug - Wifi File Manager & Interface

Proof of Concept (PoC):
=======================
The local path traversal web vulnerability can be exploited by local attackers with low privileged application user account without user interaction.
For security demonstration or to reproduce the security vulnerability follow the provided information and steps below to continue.

PoC: Files from FileBug - Wifi File Manager & Interface

<html><head><title>Files from FileBug</title><style>html {background-color:#eeeeee} body { background-color:#FFFFFF; font-family:Tahoma,Arial,Helvetica,sans-serif; font-size:18x; margin-left:15%; margin-right:15%; border:3px groove #006600; padding:15px; } </style><script type="text/javascript"> function uploadCheck(){document.getElementById("submit").style.display='none';return true;}</script></head><body><h1>Files from FileBug</h1><bq>The following files are hosted live from the iPhone's Docs folder.</bq><p><a href="..">..</a><br />
<a href="BoxCoreDataStore.sqlite">BoxCoreDataStore.sqlite</a> ( 88.0 Kb, 2014-10-14 17:14:53 +0000)<br />
<a href="Documents/">Documents/</a> ( 0.1 Kb, 2014-10-14 17:14:54 +0000)<br />
<a href="Downloads/">Downloads/</a> ( 0.1 Kb, 2014-10-14 17:14:54 +0000)<br />
<a href="Files.sqlite">Files.sqlite</a> ( 140.0 Kb, 2014-10-14 18:03:36 +0000)<br />
<a href="Movies/">Movies/</a> ( 0.1 Kb, 2014-10-14 17:14:54 +0000)<br />
<a href="Photos/">Photos/</a> ( 0.1 Kb, 2014-10-14 17:14:54 +0000)<br />
<a href="SavedFiles/">SavedFiles/</a> ( 0.1 Kb, 2014-10-14 17:14:53 +0000)<br />
<a href="bkm337"><../../[DIRECTORY TRAVERSAL WEB VULNERABILITY!]>.txt</a> ( 0.0 Kb, 2014-10-14 18:01:31 +0000)<br />
<a href="tempToView/">tempToView/</a> ( 0.1 Kb, 2014-10-14 17:14:53 +0000)<br />
</p>

Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure encode of the filename and foldername after the sync during the add procedure.
Restrict the input of the filename and foldername to prevent the issue and restrict the path folder request to ensure.

Security Risk:
==============
The security risk of the directory traversal web vulnerability in the filename and foldername values by sync is estimated as medium.

Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkmevolution-sec.com) [www.vulnerability-lab.com]

Disclaimer & Information:
=========================
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