Ruby Rack < 2.2.23 / 3.0.x < 3.1.21 / 3.2 < 3.2.6 Multiple Vulnerabilities

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(305959);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/17");

  script_cve_id(
    "CVE-2026-34826",
    "CVE-2026-34829",
    "CVE-2026-34830",
    "CVE-2026-34786",
    "CVE-2026-34785",
    "CVE-2026-34230",
    "CVE-2026-34763",
    "CVE-2026-26961",
    "CVE-2026-34831"
  );
  script_xref(name:"IAVB", value:"2026-B-0085");

  script_name(english:"Ruby Rack < 2.2.23 / 3.0.x < 3.1.21 / 3.2 < 3.2.6 Multiple Vulnerabilities");

  script_set_attribute(attribute:"synopsis", value:
"The remote host has an application installed that is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of the Rack Ruby library installed on the remote host is prior to 2.2.23, prior to 3.1.21, or prior to 3.2.6.
It is, therefore, affected by multiple vulnerabilities:

  - Rack::Utils.get_byte_ranges parses HTTP Range header without limiting the number of individual byte ranges,
    leading to denial of service (CVE-2026-34826)

  - Rack::Static uses simple string prefix check allowing unintended file disclosure (CVE-2026-34785)

  - Rack::Utils.select_best_encoding has quadratic time complexity with many wildcard Accept-Encoding
    entries (CVE-2026-34230)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://github.com/rack/rack/security/advisories/GHSA-x8cg-fq8g-mxfx");
  script_set_attribute(attribute:"see_also", value:"https://github.com/rack/rack/security/advisories/GHSA-8vqr-qjwx-82mw");
  script_set_attribute(attribute:"see_also", value:"https://github.com/rack/rack/security/advisories/GHSA-qv7j-4883-hwh7");
  script_set_attribute(attribute:"see_also", value:"https://github.com/rack/rack/security/advisories/GHSA-q4qf-9j86-f5mh");
  script_set_attribute(attribute:"see_also", value:"https://github.com/rack/rack/security/advisories/GHSA-h2jq-g4cq-5ppq");
  script_set_attribute(attribute:"see_also", value:"https://github.com/rack/rack/security/advisories/GHSA-v569-hp3g-36wr");
  script_set_attribute(attribute:"see_also", value:"https://github.com/rack/rack/security/advisories/GHSA-7mqq-6cf9-v2qp");
  script_set_attribute(attribute:"see_also", value:"https://github.com/rack/rack/security/advisories/GHSA-vgpv-f759-9wx3");
  script_set_attribute(attribute:"see_also", value:"https://github.com/rack/rack/security/advisories/GHSA-q2ww-5357-x388");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Rack version 2.2.23, 3.1.21, 3.2.6 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-34785");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-34830");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/04/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:ruby:rack");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ruby_modules_nix_installed.nbin", "ruby_gem_modules_macos_installed.nbin", "ruby_modules_win_installed.nbin");
  script_require_keys("Host/ruby/modules/enumerated");

  exit(0);
}

include('ruby.inc');

var gem_name = 'rack';

var app_info = ruby_gems::get_app_info(app:gem_name);

if (empty_or_null(app_info))
  audit(AUDIT_NOT_INST, gem_name);

vcf::check_all_backporting(app_info:app_info);

var constraints = [
  {'min_version': '0.0', 'fixed_version': '2.2.23'},
  {'min_version': '3.0', 'fixed_version': '3.1.21'},
  {'min_version': '3.2', 'fixed_version': '3.2.6'}
];

vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_HOLE);