OpenSSL Information Disclosure Vulnerability (20191206) - Linux

# 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:openssl:openssl";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.150703");
  script_version("2021-08-25T12:01:03+0000");
  script_tag(name:"last_modification", value:"2021-08-25 12:01:03 +0000 (Wed, 25 Aug 2021)");
  script_tag(name:"creation_date", value:"2021-07-19 12:38:23 +0000 (Mon, 19 Jul 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:L/I:N/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-06-14 18:15:00 +0000 (Mon, 14 Jun 2021)");

  script_cve_id("CVE-2019-1551");

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

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

  script_name("OpenSSL Information Disclosure Vulnerability (20191206) - Linux");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2021 Greenbone Networks GmbH");
  script_family("General");
  script_dependencies("gb_openssl_consolidation.nasl", "os_detection.nasl");
  script_mandatory_keys("openssl/detected", "Host/runs_unixoide");

  script_tag(name:"summary", value:"OpenSSL is prone to an information disclosure vulnerability.");

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

  script_tag(name:"insight", value:"There is an overflow bug in the x64_64 Montgomery squaring
  procedure used in exponentiation with 512-bit moduli. No EC algorithms are affected. Analysis
  suggests that attacks against 2-prime RSA1024, 3-prime RSA1536, and DSA1024 as a result of this
  defect would be very difficult to perform and are not believed likely. Attacks against DH512 are
  considered just feasible. However, for an attack the target would have to re-use the DH512 private
  key, which is not recommended anyway. Also applications directly using the low level API
  BN_mod_exp may be affected if they use BN_FLG_CONSTTIME.");

  script_tag(name:"affected", value:"OpenSSL version 1.0.2 through 1.0.2t and 1.1.1 through 1.1.1d.");

  script_tag(name:"solution", value:"Update to version 1.0.2u, 1.1.1e or later.");

  script_xref(name:"URL", value:"https://www.openssl.org/news/secadv/20191206.txt");

  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(version: version, test_version: "1.0.2", test_version2: "1.0.2t")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "1.0.2u", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range(version: version, test_version: "1.1.1", test_version2: "1.1.1d")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "1.1.1e", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);