OpenSSL: ECDSA Private Key Leak (CVE-2011-1945) - 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("1.3.6.1.4.1.25623.1.0.117620");
  script_version("2021-09-01T06:46:23+0000");
  script_tag(name:"last_modification", value:"2021-09-01 06:46:23 +0000 (Wed, 01 Sep 2021)");
  script_tag(name:"creation_date", value:"2021-08-31 15:24:47 +0000 (Tue, 31 Aug 2021)");
  script_tag(name:"cvss_base", value:"2.6");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:H/Au:N/C:P/I:N/A:N");

  script_cve_id("CVE-2011-1945");

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

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

  script_name("OpenSSL: ECDSA Private Key Leak (CVE-2011-1945) - 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 leaks ECDSA private key through a remote timing attack.");

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

  script_tag(name:"insight", value:"The OpenSSL ladder implementation for scalar multiplication of
  points on elliptic curves over binary fields is susceptible to a timing attack vulnerability. This
  vulnerability can be used to steal the private key of a TLS server that authenticates with ECDSA
  signatures and binary curves.");

  script_tag(name:"affected", value:"OpenSSL through 1.0.0d.");

  script_tag(name:"solution", value:"No known solution was made available for at least one year
  since the disclosure of this vulnerability. Likely none will be provided anymore. General solution
  options are to upgrade to a newer release, disable respective features, remove the product or
  replace the product by another one.

  Vendor statement:

  The OpenSSL team have reviewed the paper, and although the result is significant, we believe that
  the affected code (ECDSA used with binary curves) is very rarely used at present. We therefore do
  not plan on issuing a security release but expect to patch this in the future.");

  script_xref(name:"URL", value:"https://www.kb.cert.org/vuls/id/536044");
  script_xref(name:"URL", value:"https://eprint.iacr.org/2011/232");

  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: "1.0.0d")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "None", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(0);