hacksysteam-HackSysExtremeVulnerableDriver/Driver/Source/PoolOverflow.c

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            HackSys Extreme Vulnerable Driver

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:
    PoolOverflow.c

Abstract:
    This module implements the functions to demonstrate
    Pool Overflow vulnerability.

--*/

#include "PoolOverflow.h"

#ifdef ALLOC_PRAGMA
    #pragma alloc_text(PAGE, TriggerPoolOverflow)
    #pragma alloc_text(PAGE, PoolOverflowIoctlHandler)
#endif // ALLOC_PRAGMA

#pragma auto_inline(off)

/// <summary>
/// Trigger the Pool Overflow Vulnerability
/// </summary>
/// <param name="pUserModeBuffer">The pointer to user mode buffer</param>
/// <param name="userModeBufferSize">Size of the user mode buffer</param>
/// <returns>NTSTATUS</returns>
NTSTATUS TriggerPoolOverflow(IN PVOID pUserModeBuffer, IN SIZE_T userModeBufferSize) {
    PVOID pKernelBuffer = NULL;
    NTSTATUS status = STATUS_SUCCESS;

    PAGED_CODE();

    __try {
        DbgPrint("[+] Allocating Pool Buffer\n");

        // Allocate Pool Memory
        pKernelBuffer = ExAllocatePoolWithTag(NonPagedPool, (SIZE_T)POOL_BUFFER_SIZE, (ULONG)POOL_TAG);

        if (!pKernelBuffer) {
            // Unable to allocate Pool Memory with Tag
            DbgPrint("[-] Unable To Allocate Pool Memory\n");

            status = STATUS_NO_MEMORY;
            return status;
        }
        else {
            DbgPrint("[+] Pool Address: 0x%p\n", pKernelBuffer);
            DbgPrint("[+] Pool Type: %s\n", STRINGIFY(NonPagedPool));
            DbgPrint("[+] Pool Size: 0x%X\n", (SIZE_T)POOL_BUFFER_SIZE);
            DbgPrint("[+] Pool Tag: %s\n", STRINGIFY(POOL_TAG));
        }

        // Verify if the buffer resides in User Mode
        ProbeForRead(pUserModeBuffer, (SIZE_T)POOL_BUFFER_SIZE, (ULONG)__alignof(UCHAR));

        DbgPrint("[+] pUserModeBuffer: 0x%p\n", pUserModeBuffer);
        DbgPrint("[+] userModeBufferSize: 0x%X\n", userModeBufferSize);
        

        #ifdef SECURE
            // Secure Note: This is secure because the developer is passing a size 
            // equal to size of the allocated Pool memory to RtlCopyMemory()/memcpy() 
            // so, there will be no overflow
            RtlCopyMemory(pKernelBuffer, pUserModeBuffer, (SIZE_T)BUFFER_SIZE);
        #else
            DbgPrint("[+] Triggering Pool Overflow\n");

            // Vulnerability Note: This is a vanilla Pool Based Overflow vulnerability 
            // because the developer is passing the user supplied value directly to 
            // RtlCopyMemory()/memcpy() without validating if the size is greater or 
            // equal to the size allocated for it in the Pool
            RtlCopyMemory(pKernelBuffer, pUserModeBuffer, userModeBufferSize);
        #endif

        if (pKernelBuffer) {
            DbgPrint("[+] Freeing Pool Memory\n");
            DbgPrint("[+] Pool Address: 0x%p\n", pKernelBuffer);
            DbgPrint("[+] Pool Tag: %s\n", STRINGIFY(POOL_TAG));

            // Free the allocated Pool Memory
            ExFreePoolWithTag(pKernelBuffer, (ULONG)POOL_TAG);
            pKernelBuffer = NULL;
        }
    }
    __except (EXCEPTION_EXECUTE_HANDLER) {
        status = GetExceptionCode();
        DbgPrint("[-] Exception Code: 0x%X\n", status);
    }

    return status;
}

/// <summary>
/// Pool Overflow Ioctl Handler
/// </summary>
/// <param name="pIrp">The pointer to IRP</param>
/// <param name="pIoStackIrp">The pointer to IO_STACK_LOCATION structure</param>
/// <returns>NTSTATUS</returns>
NTSTATUS PoolOverflowIoctlHandler(IN PIRP pIrp, IN PIO_STACK_LOCATION pIoStackIrp) {
    PVOID pUserModeBuffer = NULL;
    SIZE_T userModeBufferSize = 0;
    NTSTATUS status = STATUS_UNSUCCESSFUL;

    UNREFERENCED_PARAMETER(pIrp);
    PAGED_CODE();

    pUserModeBuffer = pIoStackIrp->Parameters.DeviceIoControl.Type3InputBuffer;
    userModeBufferSize = pIoStackIrp->Parameters.DeviceIoControl.InputBufferLength;

    if (pUserModeBuffer) {
        status = TriggerPoolOverflow(pUserModeBuffer, userModeBufferSize);
    }

    return status;
}

#pragma auto_inline()