LAN Scan HD v1.20 iOS - Command Inject Vulnerability Nov 17 2015 01:13PM
Vulnerability Lab (research vulnerability-lab com)
Document Title:
LAN Scan HD v1.20 iOS - Command Inject Vulnerability

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

Product & Service Introduction:
See whats all connect to your favorite public WiFi network or your home network. This all-in-one information appliation is an extremely fast and
thorough security solution for every user. LAN Scan HD is an application developed for Network Administrators and IT Managers but presented in a
format targeted for non-professionals. This application allows you to view information about all the devices on a local network. Network devices
are displayed in a very logical and convenient format for displaying the most pertinent information about each device.

(Copy of the Product Homepage: https://itunes.apple.com/us/app/lan-scan-hd-network-device/id597952879 )

Abstract Advisory Information:
The Vulnerability Laboratory Core Research Team discovered a local command inject vulnerability in the LAN Scan HD v1.20 iOS mobile application.

Vulnerability Disclosure Timeline:
2015-11-05: Public Disclosure (Vulnerability Laboratory)

Discovery Status:

Affected Product(s):
Nutec Apps - LLC
Product: LAN Scan HD - iOS (Web-Application) 1.20

Exploitation Technique:

Severity Level:

Technical Details & Description:
A local command inject web vulnerability has been discovered in the official LAN Scan HD v1.20 iOS mobile web-application.
The web vulnerability allows to inject malicious script codes to the application-side of the vulnerable iOS mobile app.

The security vulnerability is located in the device name value of the `Scan Network` module. Local attackers are able to
manipulate the name value of the device to compromise the mail function of the Lan Scan HD mobile app. The html encoding
is broken in the `Email Scan` export function. Local attackers are able to manipulate the device name cid name to compromise
the application internal validation via the `Email Scan` (html). The attack vector of the vulnerability is application-side
and the injection point is the device name information settings > name > input field.

The security risk of the local commandpath inject vulnerability is estimated as medium with a cvss (common vulnerability
scoring system) count of 3.6. Exploitation of the local command inject vulnerability requires a low privilege iOS system
device user account with restricted access and no user interaction. Successful exploitation of the vulnerability results in
unauthorized execution of system specific commands and unauthorized path value requests to compromise the mobile iOS
application and connected device components.

Vulnerable Module(s)
[+] Scan Network

Vulnerable Parameter(s)
[+] device cell name (cid)

Affected Module(s)
[+] Email Scan - Mail

Proof of Concept (PoC):
The vulnerability can be exploited by local attackers with restricted iOS device user account and without user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.

Manual steps to reproduce the vulnerability ...
1. Start your iOS device (iPhone or iPad)
2. Install the LAN Scan HD application to your iOS device
3. Open the iOS device settings info menu
4. Change your device name to a malicious payload with path conditions (command inject)
5. Save the input and open the LAN Scan HD application
6. Click the Scan Network button on the bottom of the screen
7. After the scan has been performed successful you click on top right the menu button
8. Push the Email Scan button to export the scan results
9. Now, the execution occurs in the email section were the device value is included!
10. Successful reproduce of the remote vulnerability!

PoC: Scan Results.html

<title>Scan Results</title>
<link rel="important stylesheet" href="chrome://messagebody/skin/messageBody.css">
</head><body><table border=0 cellspacing=0 cellpadding=0 width="100%" class="header-part1"><tr><td><b>Betreff: </b>Scan Results</td></tr>
<tr><td><b>Von: </b>Benjamin Mejri Kunz <vulnerabilitylab (at) icloud (dot) com [email concealed]></td></tr><tr><td><b>Datum: </b>17.10.2015 19:53</td></tr></table>
<table border=0 cellspacing=0 cellpadding=0 width="100%" class="header-part2"><tr><td><b>An: </b>aki <bkm (at) evolution-sec (dot) com [email concealed]></td></tr></table><br>
<html><head><meta http-equiv="content-type" content="text/html; "></head><body dir="auto"><div>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Scan PoC</title>
<table width="600" cellspacing="3">
<td width="500"><div align="left"><strong>Network Scanned</strong>: PenTest23-Router</div></td>
<td width="85"></td></tr>
<table width="600" cellspacing="3">
<td><div align="right">on Date:</div></td>
<td>17.10.2015, 19:52</td>
<td width="130"><div align="right">Address Range:</div></td>
<td width="455"> -</td>
<table width="600" cellspacing="3">
<td width="501"><div align="left"><strong>Device Information</strong>:</div></td>
<td width="84"></td>
<table width="600" cellspacing="3">
<td width="130"><div align="right">Name:</div></td>
<td><div align="right">IP Address:</div></td>
<td><div align="right">MAC:</div></td>
<td><div align="right">Vendor:</div></td>
<p><strong>Gateway Information:<br /></strong><table width="600" cellspacing="3">

Solution - Fix & Patch:
The vulnerability can be patched by a secure parse and encode of the vulnerable device name value in the export function.
Restrict the input and disallow usage of special chars in names. Filter by an exception handling that prevents the execution of malicious local stored device values.

Security Risk:
The security risk of the local command inject web vulnerability in the LAN Scan HD application is estimated as medium. (CVSS 5.6)

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

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