File Explorer 1.4 Access Bypass

Type packetstorm
Reporter Benjamin Kunz Mejri
Modified 2020-05-04T00:00:00


                                            `Document Title:  
File Explorer v1.4 iOS - Multiple Persistent Vulnerabilities  
References (Source):  
Release Date:  
Vulnerability Laboratory ID (VL-ID):  
Common Vulnerability Scoring System:  
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:  
Abstract Advisory Information:  
The vulnerability laboratory core research team discovered multiple  
persistent vulnerabilities in the File Explorer v1.4 mobile ios  
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:  
Exploitation Technique:  
Severity Level:  
Authentication Type:  
Pre auth - no privileges  
User Interaction:  
Low User Interaction  
Disclosure Type:  
Independent Security Research  
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 -  
Benjamin Kunz Mejri -  
Disclaimer & Information:  
The information provided in this advisory is provided as it is without  
any warranty. Vulnerability Lab disclaims all warranties,  
either expressed or implied, including the warranties of merchantability  
and capability for a particular purpose. Vulnerability-Lab  
or its suppliers are not liable in any case of damage, including direct,  
indirect, incidental, consequential loss of business profits  
or special damages, even if Vulnerability-Lab or its suppliers have been  
advised of the possibility of such damages. Some states do  
not allow the exclusion or limitation of liability for consequential or  
incidental damages so the foregoing limitation may not apply.  
We do not approve or encourage anybody to break any licenses, policies,  
deface websites, hack into databases or trade with stolen data.  
Any modified copy or reproduction, including partially usages, of this  
file requires authorization from Vulnerability Laboratory.  
Permission to electronically redistribute this alert in its unmodified  
form is granted. All other rights, including the use of other  
media, are reserved by Vulnerability-Lab Research Team or its suppliers.  
All pictures, texts, advisories, source code, videos and other  
information on this website is trademark of vulnerability-lab team & the  
specific authors or managers. To record, list, modify, use or  
edit our material contact (admin@ or research@) to get a ask permission.  
Copyright © 2020 | Vulnerability Laboratory - [Evolution  
Security GmbH]™