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  
็‰ º • • • •  
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 -  
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