Samba Privilege Escalation Vulnerability (CVE-2022-32744)

# Copyright (C) 2022 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:samba:samba";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.104257");
  script_version("2023-10-19T05:05:21+0000");
  script_tag(name:"last_modification", value:"2023-10-19 05:05:21 +0000 (Thu, 19 Oct 2023)");
  script_tag(name:"creation_date", value:"2022-07-28 07:34:46 +0000 (Thu, 28 Jul 2022)");
  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_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2022-08-29 18:09:00 +0000 (Mon, 29 Aug 2022)");

  script_cve_id("CVE-2022-32744");

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

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

  script_name("Samba Privilege Escalation Vulnerability (CVE-2022-32744)");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2022 Greenbone Networks GmbH");
  script_family("Privilege escalation");
  script_dependencies("smb_nativelanman.nasl", "gb_samba_detect.nasl");
  script_mandatory_keys("samba/smb_or_ssh/detected");

  script_tag(name:"summary", value:"Samba is prone to a privilege escalation vulnerability.");

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

  script_tag(name:"insight", value:"Tickets received by the kpasswd service were decrypted without
  specifying that only that service's own keys should be tried. By setting the ticket's server name
  to a principal associated with their own account, or by exploiting a fallback where known keys
  would be tried until a suitable one was found, an attacker could have the server accept tickets
  encrypted with any key, including their own.

  A user could thus change the password of the Administrator account and gain total control over the
  domain. Full loss of confidentiality and integrity would be possible, as well as of availability
  by denying users access to their accounts.

  In addition, the kpasswd service would accept tickets encrypted by the krbtgt key of an RODC, in
  spite of the fact that RODCs should not have been able to authorise password changes.");

  script_tag(name:"affected", value:"Samba versions starting from 4.3 and prior to 4.14.14, 4.15.x
  prior to 4.15.9 and 4.16.x prior to 4.16.4.");

  script_tag(name:"solution", value:"Update to version 4.14.14, 4.15.9, 4.16.4 or later.");

  script_xref(name:"URL", value:"https://www.samba.org/samba/security/CVE-2022-32744.html");

  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_in_range_exclusive(version: version, test_version_lo: "4.3.0", test_version_up: "4.14.14")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "4.14.14 / 4.15.9 / 4.16.4", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range_exclusive(version: version, test_version_lo: "4.15.0", test_version_up: "4.15.9")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "4.15.9 / 4.16.4", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range_exclusive(version: version, test_version_lo: "4.16.0", test_version_up: "4.16.4")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "4.16.4", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);