Ruby Random Number Generation Local Denial Of Service Vulnerability

# Copyright (C) 2011 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:ruby-lang:ruby";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.902558");
  script_version("2022-04-28T13:38:57+0000");
  script_tag(name:"last_modification", value:"2022-04-28 13:38:57 +0000 (Thu, 28 Apr 2022)");
  script_tag(name:"creation_date", value:"2011-08-29 16:22:41 +0200 (Mon, 29 Aug 2011)");
  script_cve_id("CVE-2011-2686");
  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_name("Ruby Random Number Generation Local Denial Of Service Vulnerability");
  script_xref(name:"URL", value:"http://xforce.iss.net/xforce/xfdb/69032");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/49015");
  script_xref(name:"URL", value:"http://redmine.ruby-lang.org/issues/show/4338");
  script_xref(name:"URL", value:"http://www.ruby-lang.org/en/news/2011/07/02/ruby-1-8-7-p352-released/");

  script_tag(name:"qod_type", value:"registry");
  script_copyright("Copyright (C) 2011 Greenbone Networks GmbH");
  script_category(ACT_GATHER_INFO);
  script_family("Denial of Service");
  script_dependencies("gb_ruby_consolidation.nasl", "os_detection.nasl");
  script_mandatory_keys("ruby/detected", "Host/runs_windows");

  script_tag(name:"impact", value:"Successful exploits may allow local attackers to cause denial-of-service
  conditions.");

  script_tag(name:"affected", value:"Ruby Versions prior to 1.8.7-p352.");

  script_tag(name:"insight", value:"The flaw exists because ruby does not reset the random seed upon forking,
  which makes it easier for context-dependent attackers to predict the values
  of random numbers by leveraging knowledge of the number sequence obtained in
  a different child process.");

  script_tag(name:"solution", value:"Upgrade to Ruby version 1.8.7-p352 or later.");

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

  script_tag(name:"summary", value:"Ruby is prone to local denial of service vulnerability.");

  script_xref(name:"URL", value:"http://rubyforge.org/frs/?group_id=167");
  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: "1.8.7", test_version2: "1.8.7.351" ) ) {
  report = report_fixed_ver( installed_version: version, fixed_version: "1.8.7-p352", install_path: location );
  security_message( data: report, port: port );
  exit( 0 );
}

exit( 99 );