Pi-hole Ad-Blocker < 5.0 Multiple Vulnerabilities

2020-05-12T00:00:00
ID OPENVAS:1361412562310143881
Type openvas
Reporter Copyright (C) 2020 Greenbone Networks GmbH
Modified 2020-06-29T00:00:00

Description

The Pi-hole Ad-Blocker is prone to an authenticated remote code execution (RCE) vulnerability in the web interface and two Cross-Site Scripting (XSS) vulnerabilities in the 3rdparty

                                        
                                            # Copyright (C) 2020 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:pi-hole:web";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.143881");
  script_version("2020-06-29T06:53:43+0000");
  script_tag(name:"last_modification", value:"2020-06-29 06:53:43 +0000 (Mon, 29 Jun 2020)");
  script_tag(name:"creation_date", value:"2020-05-12 04:23:02 +0000 (Tue, 12 May 2020)");
  script_tag(name:"cvss_base", value:"9.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:S/C:C/I:C/A:C");

  script_cve_id("CVE-2020-11108", "CVE-2019-8331");

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

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

  script_name("Pi-hole Ad-Blocker < 5.0 Multiple Vulnerabilities");

  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2020 Greenbone Networks GmbH");
  script_family("Web application abuses");
  script_dependencies("gb_pi-hole_detect.nasl");
  script_mandatory_keys("pi-hole/detected");

  script_tag(name:"summary", value:"The Pi-hole Ad-Blocker is prone to an authenticated remote code execution (RCE)
  vulnerability in the web interface and two Cross-Site Scripting (XSS) vulnerabilities in the 3rdparty 'Bootstrap'
  library.");

  script_tag(name:"insight", value:"The following flaws exist:

  - The Gravity updater in Pi-hole allows an authenticated adversary to upload arbitrary files. This can be abused for
  Remote Code Execution by writing to a PHP file in the web directory. (Also, it can be used in conjunction with the
  sudo rule for the www-data user to escalate privileges to root.) The code error is in gravity_DownloadBlocklistFromUrl
  in gravity.sh (CVE-2020-11108)

  - An XSS vulnerability in the tooltip and popover plugins of the 3rdpary library 'Bootstrap' was fixed by implementing
  a new HTML sanitizer (CVE-2019-8331)

  - An XSS vulnerability in the in Alert, Carousel, Collapse, Dropdown, Modal, and Tab components of the 3rdpary library
  'Bootstrap' was fixed");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");

  script_tag(name:"affected", value:"Pi-hole Ad-Blocker version 4.4 and prior.");

  script_tag(name:"solution", value:"Update to version 5.0 or later.");

  script_xref(name:"URL", value:"https://github.com/pi-hole/pi-hole/pull/3237");
  script_xref(name:"URL", value:"https://github.com/pi-hole/AdminLTE/pull/1022");
  script_xref(name:"URL", value:"https://frichetten.com/blog/cve-2020-11108-pihole-rce/");

  exit(0);
}

include("host_details.inc");
include("version_func.inc");

if (!port = get_app_port(cpe: CPE))
  exit(0);

if (!infos = get_app_version_and_location(cpe: CPE, port: port, exit_no_version: TRUE))
  exit(0);

version = infos["version"];
location = infos["location"];

if (version_is_less(version: version, test_version: "5.0")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "5.0", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);