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Date: Tue, 28 Apr 2020 10:59:19 +0200
From: Vulnerability Lab <>
Subject: [FD] File Sharing & Chat v1.0 iOS - Denial of Service Vulnerability

Document Title:
File Sharing & Chat v1.0 iOS - Denial of Service Vulnerability

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

Vulnerability Class:
Denial of Service

Current Estimated Price:
500€ - 1.000€

Product & Service Introduction:
WiFi File Transfer is easiest and quickest file sharing application,
supporting multiple files sharing with multiple devices simultaneously.
WiFi File Transfer Application provides solution for the iPhone users
who want to connect their mobile with PC without connecting a data cable
or wire. WiFi File Sharing App provides the connectivity of mobile
device with PC through Wi-Fi. User can copy, paste, and delete files from
phone by connecting it with Computer. App also supports transfer between
one iPhone to another iPhone.

(Copy of the Homepage:

Abstract Advisory Information:
The vulnerability laboratory core research team discovered a remote
denial of service vulnerability in the

Affected Product(s):
Sandeep Bhandari
File Sharing & Chat v1.0 - Apple iOS Mobile Web Application

Vulnerability Disclosure Timeline:
2020-04-27: Public Disclosure (Vulnerability Laboratory)

Discovery Status:

Exploitation Technique:

Severity Level:

Authentication Type:
No authentication (guest)

User Interaction:
No User Interaction

Disclosure Type:
Independent Security Research

Technical Details & Description:
A denial of service web vulnerability has been discovered in the
official mobile ios web-application.
The vulnerability allows remote attackers to crash or freeze the
application process or its components.

Attackers are able to transmit special crafted chat messages to trigger
a validation error that is able
to crash the mobile ios application process. The error occurs due to the
transmit of the message body content.
On delivery all connected clients to the chats are crashing at the same

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

Manual steps to reproduce the vulnerability ...
1. Open the web-application
2. Open the chat module on the buttom of the app index
3. Insert payload and transmit via send to all users
4. All app clients do crash with an uncaught validation exception
5. Successful reproduce of the denial of service vulnerability!

PoC: Exploitation
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Security Risk:
The security risk of the denial of service web vulnerability in the
mobile web-application is estimated as medium.

Credits & Authors:
Vulnerability-Lab -
Benjamin Kunz Mejri -

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,
indirect, incidental, consequential loss of business profits
or special damages, even if Vulnerability-Lab or its suppliers have been
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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