Print n Share v5.5 iOS - Multiple Web Vulnerabilities

[Vulnerability Lab <research () vulnerability-lab com>]

Document Title:
===============
Print n Share v5.5 iOS - Multiple Web Vulnerabilities


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1154


Release Date:
=============
2013-12-06


Vulnerability Laboratory ID (VL-ID):
====================================
1154


Common Vulnerability Scoring System:
====================================
9.2


Product & Service Introduction:
===============================
Print directly to the widest range of network or WiFi printers, without a computer or AirPrint! Alternatively print 
via your Mac/PC to ALL printers including USB & Bluetooth printers. Print... documents cloud files,web pages,emails, 
attachments, photos, contacts, calendars, clipboard items, convert to PDF and much more - to ANY PRINTER!

(Copy of the Homepage: https://itunes.apple.com/en/app/print-n-share-der-all-in-one/id301656026 


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered multiple web vulnerabilities in the Print n Share v5.5 mobile 
application for apple iOS.


Vulnerability Disclosure Timeline:
==================================
2013-12-01:    Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Affected Product(s):
====================
EuroSmartz Ltd
Product: Print n Share 5.5


Exploitation Technique:
=======================
Remote


Severity Level:
===============
Critical


Technical Details & Description:
================================
1.1
A local file/path include web vulnerability has been discovered in the official Print n Share v5.5 mobile application 
for apple iOS.
The file include vulnerability allows remote attackers to include (upload) local file or path requests to compromise 
the application or service.

The remote file include web vulnerability is located in the import file module in the filename value. Remote attackers 
can inject own files or 
path requests by adding regular text files (add). It is also possible to use the `rename` or `import` function to 
inject. The file include and 
path request execute occurs in the main file dir index or subcategory listing of the mobile application. The security 
risk of the local file 
include web vulnerability is estimated as high(+) with a cvss (common vulnerability scoring system) count of 8.4(+).

Exploitation of the local file include web vulnerability requires no user interaction or privileged web-application 
user account with password. 
Successful exploitation of the vulnerability results in unauthorized local file uploads and path requests to compromise 
the device or mobile app.

Request Method(s):
                                [+] [POST]

Vulnerable Inputs(s):
                                [+] Neue Text Datei (New Text File)
                                [+] Umbenennen File (Rename File)

Vulnerable Parameter(s):
                                [+] filename

Affected Module(s):
                                [+] Index File Dir Listing (http://localhost:8080)



1.2
An arbitrary file upload web vulnerability has been discovered in the official Print n Share v5.5 mobile application 
for apple iOS.
The arbitrary file upload issue allows remote attackers to upload files with multiple extensions to bypass the 
web-server or system validation.

The vulnerability is located in the import file module. Remote attackers are able to upload a php or js web-shells by 
renaming the file with 
multiple extensions to bypass the file restriction mechanism. The attacker uploads for example a web-shell with the 
following name and extension 
`image.jpg.gif.js.php.jpg`. After the upload the attacker needs to open the file in the web application. He deletes the 
.jpg & . gif file 
extension and can access the application with elevated access rights. The security risk of the arbitrary file upload 
web vulnerability is 
estimated as high with a cvss (common vulnerability scoring system) count of 7.8(+).

Exploitation of the arbitrary file upload web vulnerability requires no user interaction or privilege application user 
account with password.
Successful exploitation of the vulnerability results in unauthorized file access because of a compromise after the 
upload of web-shells.


Request Method(s):
                                [+] [POST]

Vulnerable Module(s):
                                [+] File Import

Vulnerable Inputs(s):
                                [+] Importieren - File > Sync

Vulnerable Parameter(s):
                                [+] filename (multiple extensions)

Affected Module(s):
                                [+] File Path Listing (http://localhost:8080)



1.3
A persistent input validation web vulnerability has been discovered in the official Print n Share v5.5 mobile 
application for apple iOS.
The (persistent) vulnerability allows remote attacker to inject own malicious script code on the application-side of 
the mobile application.

The persistent input validation vulnerability is located in the Ordername (foldername) value of the print n share 
mobile web-application.
The exploitation can be done by usage of the local standard iOS pictures or video (default) app. Attackers rename the 
local device photo 
or video foldername.The persistent execute occurs in the listed folder of the web-server interface 
(http://localhost:8080). Remote attackers 
can also change the foldername by usage of the application to exploit (inject) via POST method own script code with 
persistent attack vector.
The vulnerable input are the `Ordername`(folder name), `Neuer Order` (new folder) and `Order Umbenennen` (folder 
rename). The security risk 
of the persistent input validation web vulnerability is estimated as medium(+) with a cvss (common vulnerability 
scoring system) count of 4.5(+).

Exploitation of the persistent input validation web vulnerability requires no privileged mobile application user 
account but low or medium 
user interaction. Successful exploitation of the persistent vulnerability results in persistent session hijacking 
(customers) attacks, account 
steal via persistent web attacks, persistent phishing or persistent manipulation of vulnerable module context.

Request Method(s):
                                [+] [POST]

Vulnerable Input(s):
                                [+] Ordnername - (Foldername)
                                [+] Neuer Ordner - (New Folder)
                                [+] Ordner Umbenennen - (Rename Folder)

Vulnerable Parameter(s):
                                [+] foldername - (path)

Affected Module(s):
                                [+] File Dir List


Proof of Concept (PoC):
=======================
1.1
The file include web vulnerability can be exploited by remote attackers without user interaction and also without 
privileged 
web-application user account. For security demonstration or to reproduce the vulnerability follow the steps and 
information below.

PoC:
http://localhost:8080/[LOCAL FILE INCLUDE WEB VULNERABILITY!]">X>"<<>"</[LOCAL FILE INCLUDE WEB VULNERABILITY!]">.php


PoC Source: Local File Include Vulnerability - Filename

<html><head>
<title>/</title>
<meta http-equiv="CONTENT-TYPE" content="text/html; charset=UTF-8">
</head>
<body>
<h2>?/</h2><br><a href="/Clip-Archiv/">Clip-Archiv/</a>
<br>X<a href="/[LOCAL FILE INCLUDE WEB VULNERABILITY!]">X>"<<>"</[LOCAL FILE INCLUDE WEB VULNERABILITY!]">.php</a>
<br><a href="/[LOCAL FILE INCLUDE WEB VULNERABILITY!]">[LOCAL FILE INCLUDE WEB VULNERABILITY!].txt</a>
</body>
<html>
</iframe></a></body></html>

Reference(s):
http://localhost:8080/



1.2
The arbitrary file upload vulnerability can be exploited by remote attackers without user interaction and also without 
privileged 
web-application user account. For security demonstration or to reproduce the vulnerability follow the steps and 
information below.


PoC:
http://localhost:8080/[file to path]">X>"<<>"</[ARBITRARY FILE UPLOAD WEB VULNERABILITY!]">.jpg.gif..html.js.php.gif.jpg


PoC Source: Arbitrary File Upload Vulnerability - Filename

<html><head>
<title>/</title>
<meta http-equiv="CONTENT-TYPE" content="text/html; charset=UTF-8">
</head>
<body>
<h2>?/</h2><br><a href="/Clip-Archiv/">Clip-Archiv/</a>
<br>X<a href="/[file]">X>"<<>"</[ARBITRARY FILE UPLOAD WEB VULNERABILITY!]">.jpg.gif..html.js.php.gif.jpg</a>
<br><a href="/[file]">[ARBITRARY FILE UPLOAD WEB VULNERABILITY!].jpg.gif..html.js.php.gif.jpg</a>
</body>
<html>
</iframe></a></body></html>

Reference(s):
http://localhost:8080/



1.3
The persistent input validation vulnerability can be exploited by remote attackers without privileged web-application 
user account 
and with low user interaction. For security demonstration or to reproduce the vulnerability follow the steps and 
information below.

PoC:
http://localhost:8080/%3E%22%3C%3C%3E%22%3C[PERSISTENT INJECTED SCRIPT CODE!]%3E/">


PoC Source: Persistent Input Validation Vulnerability - Ordnername (Foldername)

<body>
<h2>&#65279;/</h2><br><a href="http://localhost:8080/Clip-Archiv/";>Clip-Archiv/</a>
<br><a href="http://localhost:8080/%3E%22%3C%3C%3E%22%3C[PERSISTENT INJECTED SCRIPT CODE!]%3E/">>"
<<>"<[PERSISTENT INJECTED SCRIPT CODE!]">/</a>
<br><a href="/Schnellstart.txt">Schnellstart.txt</a>


Reference(s):
http://localhost:8080/



Solution - Fix & Patch:
=======================
1.1
The file include web vulnerability can be patched by a secure encode and parse of the filename and the connected path 
value.

1.2
to fix the arbitrary file upload vulnerability it is required to restrict with a filter mechanism the filename 
extensions.
Disallow multiple extensions and setup and own exception-handling to prevent arbitrary file uploads and restricted file 
upload bypass.

1.3
To patch the persistent input validation web vulnerability parse and encode the `Ordername` (foldername) input values 
in the import, add and rename function.
Filter and encode also the vulnerable output section of the malicious injected test values.


Security Risk:
==============
1.1
The security risk of the local file include web vulnerability is estimated as critical with a cvss (common 
vulnerability scoring system) count of 8.4(+).

1.2
The security risk of the arbitrary file upload and upload restriction bypass vulnerability is estimated as high(+) with 
a cvss (common vulnerability scoring system) count of 7.8(+).

1.3
The security risk of the persistent input validation web vulnerability is estimated as medium(+) with a cvss (common 
vulnerability scoring system) count of 4.5(+).


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm () evolution-sec com) [www.vulnerability-lab.com]


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=========================
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