OpenBSD OpenSSH <= 7.9 Multiple Vulnerabilities

# 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,
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
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# 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:openbsd:openssh";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.117786");
  script_version("2023-10-20T16:09:12+0000");
  script_tag(name:"last_modification", value:"2023-10-20 16:09:12 +0000 (Fri, 20 Oct 2023)");
  script_tag(name:"creation_date", value:"2021-11-22 11:17:01 +0000 (Mon, 22 Nov 2021)");
  script_tag(name:"cvss_base", value:"5.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:N/I:P/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2023-03-24 18:12:00 +0000 (Fri, 24 Mar 2023)");

  script_cve_id("CVE-2018-20685", "CVE-2019-6109", "CVE-2019-6110", "CVE-2019-6111");

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

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

  script_name("OpenBSD OpenSSH <= 7.9 Multiple Vulnerabilities");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2021 Greenbone Networks GmbH");
  script_family("General");
  script_dependencies("gb_openssh_consolidation.nasl");
  script_mandatory_keys("openssh/detected");

  script_tag(name:"summary", value:"OpenBSD OpenSSH is prone to multiple vulnerabilities.");

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

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

  - CVE-2018-20685: bypass of intended access restrictions in the scp client

  - CVE-2019-6109, CVE-2019-6110: manipulation of the output in the scp client by a malicious server

  - CVE-2019-6111: overwrite of arbitrary files in the scp client by a malicious server");

  script_tag(name:"affected", value:"OpenBSD OpenSSH versions 7.9 and prior.");

  script_tag(name:"solution", value:"Update to version 8.0 or later.");

  script_xref(name:"URL", value:"https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt");
  script_xref(name:"URL", value:"http://www.openwall.com/lists/oss-security/2019/04/18/1");

  exit(0);
}
include("version_func.inc");
include("host_details.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: "7.9")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "8.0", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);