HardDrive 2.1 Arbitrary File Upload

HardDrive version 2.1 for iOS suffers from an arbitrary file upload vulnerability.

MD5 | 695c62431428b0200073ffddb04b953a

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: https://apps.apple.com/ch/app/harddrive/id383226784 )

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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