Linkus Photo Manager Pro 4.4.0 Code Execution

`Document Title:  
===============  
Photo Manager Pro 4.4.0 iOS - Code Execution Vulnerability  
  
  
References (Source):  
====================  
http://www.vulnerability-lab.com/get_content.php?id=1444  
  
  
Release Date:  
=============  
2015-03-10  
  
  
Vulnerability Laboratory ID (VL-ID):  
====================================  
1444  
  
  
Common Vulnerability Scoring System:  
====================================  
8.6  
  
  
Product & Service Introduction:  
===============================  
Do you have troubles for managing thousands of photos and videos? Do you have any private photos or videos? Are you looking for a photo portfolio app?   
Photo Manager Pro is exactly you are looking for. Photo Manager Pro is extremely easy to use. TP Transfer: Transfer folders and files between computer   
and device over wifi network. HTTP Transfer: Transfer files between computer and device over wifi network. View photos in the browser. Peer to Peer   
Transfer: Directly transfer files between iPad, iPhone and iPod Touch over wifi network. USB Transfer: Import/Export photos from/to iTunes file sharing.  
Basic Transfer: Import/Export photos from/to the Photos app.  
  
(Copy of the Vendor Homepage: https://itunes.apple.com/de/app/photo-manager-pro/id393858562 & http://www.linkusnow.com/photomanager/help/ipad/help_main.php )  
  
  
Abstract Advisory Information:  
==============================  
The Vulnerability Laboratory Research Team discovered a code execution vulnerability in the official Linkus Photo Manager Pro v4.4.0 iOS mobile web-application.  
  
  
Vulnerability Disclosure Timeline:  
==================================  
2015-03-10: Public Disclosure (Vulnerability Laboratory)  
  
  
Discovery Status:  
=================  
Published  
  
  
Affected Product(s):  
====================  
Linkus  
Product: Photo Manager Pro - iOS Mobile Web Application (Wifi) 4.4.0  
  
  
Exploitation Technique:  
=======================  
Remote  
  
  
Severity Level:  
===============  
Critical  
  
  
Technical Details & Description:  
================================  
An arbitrary code execution vulnerability has been discovered in the official Linkus Photo Manager Pro v4.4.0 iOS mobile web-application.  
The vulnerability allows remote attackers to execute malicious codes on the application-side of the vulnerable app to compromise the   
target mobile device.  
  
The vulnerability is located in the `folderName` value of the `newfolder.action` module. Remote attackers are able to manipulate the   
`folderName` value in the `index.html#?w=300` file POST method request to compromise the application, user session information or connected   
device components. The attacker tampers the new Folder POST method request to exchange the regular folderName value with special crafted code.   
The input context is becomes visible at the main index service or subfolder (path). The vector of the vulnerability is located on the application-side.   
  
The security risk of the arbitrary code execution vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 8.6.  
Exploitation of the arbitrary code execution vulnerability requires no user interaction or privileged web-application user account with password.  
Successful exploitation of the vulnerability results in session hijacking, persistent phishing, persistent external redirects and persistent   
manipulation function or connected module context.  
  
Request Method(s):  
[+] [POST]  
  
Vulnerable Module(s):  
[+] newfolder.action  
  
Vulnerable Parameter(s):  
[+] folderName  
  
Affected Module(s):  
[+] Index (http://localhost:8080)  
[+] Sub Category Path  
  
  
Proof of Concept (PoC):  
=======================  
The code execution vulnerability can be exploited by remote attackers without privileged application user account or user interaction.  
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.  
  
PoC: Create Folder  
  
<div id="main"><div id="breadcrumb">Home</div>  
<div id="content"><ul id="folders_ul"><li><div class="folder_item_bg"><img src="images/blank.gif" class="blank"><a href="browse_folder.html?folderID=1"><img src="images/blank_thumbnail.png" height="86" width="80"></a></div><div class="folder_label"><a href="browse_folder.html?folderID=1">Family</a></div></li><li><div class="folder_item_bg"><img src="images/blank.gif" class="blank"><a href="browse_folder.html?folderID=2"><img src="images/blank_thumbnail.png" height="86" width="80"></a></div><div class="folder_label"><a href="browse_folder.html?folderID=2">Friends</a></div></li><li><div class="folder_item_bg"><img src="images/blank.gif" class="blank"><a href="browse_folder.html?folderID=3"><img src="images/blank_thumbnail.png" height="86" width="80"></a></div><div class="folder_label"><a href="browse_folder.html?folderID=3">Travel</a></div></li><li><div class="folder_item_bg"><img src="images/blank.gif" class="blank"><a href="browse_folder.html?folderID=4"><img src="images/blank_thumbnail.png" height="86" width="80"></a></div><div class="folder_label"><a href="browse_folder.html?folderID=4">Shopping</a></div></li><li><div class="folder_item_bg"><img src="images/blank.gif" class="blank"><a href="browse_folder.html?folderID=5"><img src="images/blank_thumbnail.png" height="86" width="80"></a></div><div class="folder_label"><a href="browse_folder.html?folderID=5">Funny;[CODE EXECUTION VULNERABILITY VIA FOLDERNAME!]></a></div></iframe></a></div></li></ul></div>  
</div>  
  
... after surfing to the created folder   
  
<div id="wrapper">  
<div id="header">  
<div id="title">  
<h1>Photo Manager Pro</h1>  
</div>  
</div>  
<div id="main">  
<div id="breadcrumb"><span id="breadcrumb_span"><a href="index.html">Home</a><label> > <a href="browse_folder.html?folderID=5">Funny;[CODE EXECUTION VULNERABILITY VIA FOLDERNAME!]></a></label></x></a></label></span></div>  
<form id="download_form" action="download.action" method="post">  
<div id="content"><ul></ul></div>  
</form>  
</div>  
  
  
PoC: Vulnerable Source  
}  
  
function createFolder() {  
$.ajax({  
type: 'POST',  
url: 'newfolder.action',  
cache: false,  
dataType: 'json',  
data: {folderName:$('#foldername').attr('value'), isSubfolder:$('#is_subfolder_hidden').attr('value'), parentFolderID:$('#parent_folder_hidden').attr('value')},  
async: false,  
success: function(result) {  
window.location.reload(false);  
}  
});  
}  
</script>  
  
  
--- Poc Session Logs [POST] (Inject) ---  
Status: 200[OK]  
POST http://localhost:8080/newfolder.action   
Load Flags[LOAD_BYPASS_CACHE LOAD_BACKGROUND ] Größe des Inhalts[23] Mime Type[application/x-unknown-content-type]  
Request Header:  
Host[localhost:8080]  
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0]  
Accept[application/json, text/javascript, */*; q=0.01]  
Accept-Language[de,en-US;q=0.7,en;q=0.3]  
Accept-Encoding[gzip, deflate]  
Content-Type[application/x-www-form-urlencoded; charset=UTF-8]  
X-Requested-With[XMLHttpRequest]  
Referer[http://localhost:8080/index.html]  
Content-Length[50]  
Cookie[isenabledpasscode=false]  
Connection[keep-alive]  
Pragma[no-cache]  
Cache-Control[no-cache]  
POST-Daten:  
folderName[*/-CODE EXECUTION VULNERABILITY!;]  
isSubfolder[0]  
parentFolderID[0]  
Response Header:  
Accept-Ranges[bytes]  
Content-Length[23]  
Date[Do., 05 März 2015 20:34:46 GMT]  
  
Status: 200[OK]  
GET http://localhost:8080/index.html   
Load Flags[VALIDATE_ALWAYS LOAD_DOCUMENT_URI LOAD_INITIAL_DOCUMENT_URI ] Größe des Inhalts[9421] Mime Type[application/x-unknown-content-type]  
Request Header:  
Host[localhost:8080]  
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0]  
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]  
Accept-Language[de,en-US;q=0.7,en;q=0.3]  
Accept-Encoding[gzip, deflate]  
Referer[http://localhost:8080/browse_folder.html?folderID=6]  
Cookie[isenabledpasscode=false]  
Connection[keep-alive]  
Cache-Control[max-age=0]  
Response Header:  
Accept-Ranges[bytes]  
Content-Length[9421]  
Date[Do., 05 März 2015 20:34:46 GMT]  
  
Status: 200[OK]  
GET http://localhost:8080/javascript/linkus.js   
Load Flags[VALIDATE_ALWAYS ] Größe des Inhalts[397] Mime Type[application/x-unknown-content-type]  
Request Header:  
Host[localhost:8080]  
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0]  
Accept[*/*]  
Accept-Language[de,en-US;q=0.7,en;q=0.3]  
Accept-Encoding[gzip, deflate]  
Referer[http://localhost:8080/index.html]  
Cookie[isenabledpasscode=false]  
Connection[keep-alive]  
Cache-Control[max-age=0]  
Response Header:  
Accept-Ranges[bytes]  
Content-Length[397]  
Date[Do., 05 März 2015 20:34:46 GMT]  
  
  
  
Reference(s):  
http://localhost:8080/index.html  
http://localhost:8080/newfolder.action  
http://localhost:8080/index.html#?w=300  
http://localhost:8080/browse_folder.html?folderID=5  
  
  
Solution - Fix & Patch:  
=======================  
The vulnerability can be patched by a secure parse and encode of the vulnerable folderName value. Restrict the input and filter the context by usage of a own exception to   
prevent the application-side code execution.  
  
  
Security Risk:  
==============  
The security risk of the code execution vulnerability in the photo manager wifi service is estimated as high. (CVSS 8.6)  
  
  
Credits & Authors:  
==================  
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri ([email protected]) [www.vulnerability-lab.com]  
  
  
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   
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consequential or incidental damages so the foregoing limitation may not apply. We do not approve or encourage anybody to break any vendor licenses,   
policies, deface websites, hack into databases or trade with fraud/stolen material.  
  
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