File Explorer v1.4 iOS - Multiple Persistent Vulnerabilities

Document Title:
===============
File Explorer v1.4 iOS - Multiple Persistent Vulnerabilities


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2219


Release Date:
=============
2020-05-03


Vulnerability Laboratory ID (VL-ID):
====================================
2219


Common Vulnerability Scoring System:
====================================
4.4


Vulnerability Class:
====================
Cross Site Scripting - Persistent


Current Estimated Price:
========================
500€ - 1.000€


Product & Service Introduction:
===============================
File Explorer is the privacy app to organize and view all your files on your iPhone or iPad. Always have your important files 
with you, protect your privacy perfectly file.

(Copy of the Homepage: https://apps.apple.com/lu/app/file-explorer-vedio-manager-photo-manager-file-browser/id954838257 )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered multiple persistent vulnerabilities in the File Explorer v1.4 mobile ios web-application.


Affected Product(s):
====================
Nong Ge
Product: File Explorer v1.4 - iOS Mobile Web-Application


Vulnerability Disclosure Timeline:
==================================
2020-05-04: Public Disclosure (Vulnerability Laboratory)


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


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


Severity Level:
===============
Medium


Authentication Type:
====================
Pre Auth (No Privileges or Session)


User Interaction:
=================
Low User Interaction


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


Technical Details & Description:
================================
An information disclosure web vulnerability has been discovered in the official File Explorer v1.4 mobile ios web-application.

The local file explorer application can be protected with a local pin. Any time the user opens the app, the pin is required 
for the auth to access to private file explorer data. The protection form is attached to process after the main form with 
for example the list in the local application context. Normally the pin must popup ahead to the local file index but in this 
case is processed afterwards. Thus allows a local attacker with physical ios device access to bypass the security mechanism 
to preview files (names, size & co) and access the protected data. In case of the attack the information can be accessed 
that earlier then the protection mechanisms captures the attempt.

Successful exploitation of the local information disclosure application vulnerability results in unauthorized data access.


Proof of Concept (PoC):
=======================
The information disclosure vulnerability can be exploited by local attackers with physical device access without user interaction.
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 the local application
2. Open the settings and setup a pin to protect
3. Move to the local web-server via wifi and start it
4. Upload some files for the index dir listing to preview
5. close the app and open it back by restart
Note: Now the pin should appear
6. Push a folder path or file that becomes visible and hold it
7. Push home again
8. Way free to edit and preview the files
9. Successful reproduce of the local vulnerability!


Security Risk:
==============
The security risk of the persistent cross site scripting web vulnerability in the web-application is estimated as medium.


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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