Document Title:  
HardDrive v2.1 iOS - Arbitrary File Upload Vulnerability  
References (Source):  
Release Date:  
Vulnerability Laboratory ID (VL-ID):  
Common Vulnerability Scoring System:  
Vulnerability Class:  
Arbitrary File Upload  
Current Estimated Price:  
1.000€ - 2.000€  
Product & Service Introduction:  
Store+Organize+Edit+Protect+Import+Download+View+Share your files right  
from your iPhone! Transform your  
iPhone/iPod touch into a real HardDrive with no extra cable or software.  
(Copy of the Homepage: )  
Abstract Advisory Information:  
The vulnerability laboratory core research team discovered an arbitrary  
file upload vulnerability in the official Air Sender v1.0.2 mobile ios  
Affected Product(s):  
Sebastien BUET  
HardDrive v2.1 - Apple iOS Mobile Web Application  
Vulnerability Disclosure Timeline:  
2020-04-29: Public Disclosure (Vulnerability Laboratory)  
Discovery Status:  
Exploitation Technique:  
Severity Level:  
Authentication Type:  
Pre auth - no privileges  
User Interaction:  
No User Interaction  
Disclosure Type:  
Independent Security Research  
Technical Details & Description:  
An arbitrary file upload web vulnerability has been discovered in the  
official Air Sender v1.0.2 iOS mobile application.  
The web vulnerability allows remote attackers to upload arbitrary files  
to compromise for example the file system of a service.  
The arbitrary upload vulnerability is located in the within the  
web-server configuration when using the upload module.  
Remote attackers are able to bypass the local web-server configuration  
by an upload of malicious webshells. Attackers  
are able to inject own files with malicious `filen` values in the  
`upload` POST method request to compromise the  
mobile web-application. The application does not perform checks for  
multiple file extensions. Thus allows an attacker  
to upload for example to upload a html.js.png file. After the upload the  
attacker requests the original url source  
with the uploaded file and removes the unwanted extension to execute the  
code in the unprotected web-frontend.  
The security risk of the vulnerability is estimated as high with a  
common vulnerability scoring system count of 7.0.  
Exploitation of the web vulnerability requires a low privilege ftp  
application user account and no user interaction.  
Successful exploitation of the arbitrary file upload web vulnerability  
results in application or device compromise.  
Request Method(s):  
[+] POST  
Vulnerable Module(s):  
[+] ./upload  
Vulnerable File(s):  
[+] file  
Proof of Concept (PoC):  
The arbitrary file upload web 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.  
PoC: Vulnerable Source (File Dir Listing Index)  
<tr><td width="100px" valign="middle" align="left"><img  
src="exploit.html"></td><td width="300px" valign="middle" align="left">  
<a href="exploit.html.js">exploit.html.js</a></td> <td width="454px"  
valign="middle" align="left">  
<em valign="middle" align="center">size: 256.7 Kb  
PoC: Exploitation  
--- PoC Session Logs [POST] --- (file)  
Host: localhost:50071  
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0)  
Gecko/20100101 Firefox/75.0  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Content-Type: multipart/form-data;  
Content-Length: 263181  
Origin: http://localhost:50071  
Connection: keep-alive  
Referer: http://localhost:50071/  
POST: HTTP/1.1 200 OK  
Accept-Ranges: bytes  
Content-Length: 381654  
Host: localhost:50071  
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0)  
Gecko/20100101 Firefox/75.0  
Accept: image/webp,*/*  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Connection: keep-alive  
GET: HTTP/1.1 200 OK  
Accept-Ranges: bytes  
Content-Length: 366735  
Security Risk:  
The security risk of the arbitrary file upload web vulnerability in the  
wifi ui of the mobile application is estimated as high.  
Credits & Authors:  
Vulnerability-Lab -  
Benjamin Kunz Mejri -  
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