Ruby BigDecimal Library DoS Vulnerability - Linux

# SPDX-FileCopyrightText: 2009 Greenbone AG
# 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-only

CPE = "cpe:/a:ruby-lang:ruby";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.900570");
  script_version("2025-09-09T05:38:49+0000");
  script_tag(name:"last_modification", value:"2025-09-09 05:38:49 +0000 (Tue, 09 Sep 2025)");
  script_tag(name:"creation_date", value:"2009-06-23 10:30:45 +0200 (Tue, 23 Jun 2009)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_cve_id("CVE-2009-1904");
  script_name("Ruby BigDecimal Library DoS Vulnerability - Linux");
  script_xref(name:"URL", value:"http://secunia.com/advisories/34135");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/35278");
  script_xref(name:"URL", value:"http://www.ruby-lang.org/en/news/2009/06/09/dos-vulnerability-in-bigdecimal/");

  script_tag(name:"qod_type", value:"executable_version_unreliable");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2009 Greenbone AG");
  script_family("Denial of Service");
  script_dependencies("gb_ruby_consolidation.nasl", "os_detection.nasl");
  script_mandatory_keys("ruby/detected", "Host/runs_unixoide");

  script_tag(name:"impact", value:"Attackers can exploit this issue to crash an application using this library.");

  script_tag(name:"affected", value:"Ruby 1.8.6 to 1.8.6-p368 and 1.8.7 to 1.8.7-p172 on Linux.");

  script_tag(name:"insight", value:"The flaw is due to an error within the BigDecimal standard library
  when trying to convert BigDecimal objects into floating point numbers
  which leads to segmentation fault.");

  script_tag(name:"solution", value:"Upgrade to version 1.8.6-p369, 1.8.7-p174 or later.");

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

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

  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:"1.8.6", test_version2:"1.8.6.367")) {
  report = report_fixed_ver(installed_version:version, fixed_version:"1.8.6-p369", install_path:location);
  security_message(port:port, data:report);
  exit(0);
}

if(version_in_range(version:version, test_version:"1.8.7", test_version2:"1.8.7.172")) {
  report = report_fixed_ver(installed_version:version, fixed_version:"1.8.7-p174", install_path:location);
  security_message(port:port, data:report);
  exit(0);
}

exit(99);