Collabora CODE / Collabora Online < 4.2.17-2 / 5.x < 6.4.9-6 Authorization Bypass Vulnerability

# Copyright (C) 2021 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:collabora:online";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.117818");
  script_version("2021-12-09T14:03:23+0000");
  script_cve_id("CVE-2021-32744");
  script_tag(name:"last_modification", value:"2021-12-09 14:03:23 +0000 (Thu, 09 Dec 2021)");
  script_tag(name:"creation_date", value:"2021-12-09 10:14:13 +0000 (Thu, 09 Dec 2021)");
  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:3.1/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:"2021-07-30 15:32:00 +0000 (Fri, 30 Jul 2021)");
  script_name("Collabora CODE / Collabora Online < 4.2.17-2 / 5.x < 6.4.9-6 Authorization Bypass Vulnerability");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2021 Greenbone Networks GmbH");
  script_family("Web application abuses");
  script_dependencies("gb_collabora_libreoffice_online_http_detect.nasl");
  script_mandatory_keys("collabora_libreoffice/online/detected");

  script_xref(name:"URL", value:"https://github.com/CollaboraOnline/online/security/advisories/GHSA-32xj-9x82-q9jw");

  script_tag(name:"summary", value:"Collabora CODE (Collabora Online Development Edition) and
  Collabora Online are prone to an authorization bypass vulnerability.");

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

  script_tag(name:"insight", value:"Unauthenticated attacker is able to gain access to files which
  are currently opened by other users in the Collabora Online editor. For successful exploitation
  the attacker is required to guess the file identifier - the predictability of this file identifier
  is dependent on external file-storage implementations (this is a potential 'IDOR' - Insecure
  Direct Object Reference - vulnerability).");

  script_tag(name:"affected", value:"Collabora CODE / Collabora Online versions prior to 4.2.17-2 and
  5.x/6.x prior to 6.4.9-6.");

  script_tag(name:"solution", value:"Update to version 4.2.17-2, 6.4.9-6 or later.");

  # nb: We're currently only getting the version like 4.2.17 and not 4.2.17-2 from the remote detection.
  script_tag(name:"qod_type", value:"remote_banner_unreliable");
  script_tag(name:"solution_type", value:"VendorFix");

  exit(0);
}

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

if( isnull( 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_equal( version:version, test_version:"4.2.17" ) ) {
  report = report_fixed_ver( installed_version:version, fixed_version:"4.2.17-2", install_path:location );
  security_message( port:port, data:report );
  exit( 0 );
}

if( version_in_range( version:version, test_version:"5.0", test_version2:"6.4.9" ) ) {
  report = report_fixed_ver( installed_version:version, fixed_version:"6.4.9-6", install_path:location );
  security_message( port:port, data:report );
  exit( 0 );
}

exit( 99 );