RHEL 9 : ruby:4.0 (RHSA-2026:20596)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2026:20596. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(316780);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/26");

  script_cve_id("CVE-2026-33210", "CVE-2026-41316");
  script_xref(name:"RHSA", value:"2026:20596");

  script_name(english:"RHEL 9 : ruby:4.0 (RHSA-2026:20596)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for ruby:4.0.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2026:20596 advisory.

    Ruby is an extensible, interpreted, object-oriented, scripting language. It has features to process text
    files and to perform system management tasks.

    Security Fix(es):

    * ruby/json: Ruby JSON: Denial of Service or Information Disclosure via format string injection
    (CVE-2026-33210)

    * erb: ERB: Arbitrary code execution via deserialization bypass (CVE-2026-41316)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and
    other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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://access.redhat.com/security/updates/classification/#important");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2449871");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2461369");
  script_set_attribute(attribute:"see_also", value:"https://issues.redhat.com/browse/RHEL-171933");
  # https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_20596.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?174bc1b0");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:20596");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL ruby:4.0 package based on the guidance in RHSA-2026:20596.");
  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:H");
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  script_cwe_id(134, 502);
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  script_set_attribute(attribute:"vuln_publication_date", value:"2026/03/19");
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include('rpm2.inc');
include('rhel.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_product = get_kb_item('installed_os/local/SSH/0/product');
if (isnull(os_product) || 'Red Hat' >!< os_product) audit(AUDIT_OS_NOT, 'Red Hat');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
if (!rhel_check_release_list(operator: 'ge', os_version: os_version, rhel_versions: ['9','9.8'])) audit(AUDIT_OS_NOT, 'Red Hat 9.x', 'Red Hat ' + os_version);

if (!get_kb_item('Host/RedHat/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);

var constraints = {
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        'content/e4s/rhel9/9.8/s390x/appstream/source/SRPMS',
        'content/e4s/rhel9/9.8/x86_64/appstream/debug',
        'content/e4s/rhel9/9.8/x86_64/appstream/os',
        'content/e4s/rhel9/9.8/x86_64/appstream/source/SRPMS',
        'content/e6s/rhel9/9.8/aarch64/appstream/debug',
        'content/e6s/rhel9/9.8/aarch64/appstream/os',
        'content/e6s/rhel9/9.8/aarch64/appstream/source/SRPMS',
        'content/e6s/rhel9/9.8/ppc64le/appstream/debug',
        'content/e6s/rhel9/9.8/ppc64le/appstream/os',
        'content/e6s/rhel9/9.8/ppc64le/appstream/source/SRPMS',
        'content/e6s/rhel9/9.8/s390x/appstream/debug',
        'content/e6s/rhel9/9.8/s390x/appstream/os',
        'content/e6s/rhel9/9.8/s390x/appstream/source/SRPMS',
        'content/e6s/rhel9/9.8/x86_64/appstream/debug',
        'content/e6s/rhel9/9.8/x86_64/appstream/os',
        'content/e6s/rhel9/9.8/x86_64/appstream/source/SRPMS',
        'content/eus/rhel9/9.8/aarch64/appstream/debug',
        'content/eus/rhel9/9.8/aarch64/appstream/os',
        'content/eus/rhel9/9.8/aarch64/appstream/source/SRPMS',
        'content/eus/rhel9/9.8/ppc64le/appstream/debug',
        'content/eus/rhel9/9.8/ppc64le/appstream/os',
        'content/eus/rhel9/9.8/ppc64le/appstream/source/SRPMS',
        'content/eus/rhel9/9.8/s390x/appstream/debug',
        'content/eus/rhel9/9.8/s390x/appstream/os',
        'content/eus/rhel9/9.8/s390x/appstream/source/SRPMS',
        'content/eus/rhel9/9.8/x86_64/appstream/debug',
        'content/eus/rhel9/9.8/x86_64/appstream/os',
        'content/eus/rhel9/9.8/x86_64/appstream/source/SRPMS'
      ],
      'pkgs': [
        {'reference':'ruby-4.0.3-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'ruby-bundled-gems-4.0.3-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'ruby-default-gems-4.0.3-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'ruby-devel-4.0.3-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'ruby-doc-4.0.3-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'ruby-libs-4.0.3-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'rubygem-bigdecimal-4.0.1-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'rubygem-bundler-4.0.6-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'rubygem-io-console-0.8.2-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'rubygem-irb-1.16.0-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'rubygem-json-2.18.0-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'rubygem-minitest-6.0.0-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'rubygem-mysql2-0.5.7-1.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'rubygem-mysql2-doc-0.5.7-1.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'rubygem-pg-1.6.3-1.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'rubygem-pg-doc-1.6.3-1.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'rubygem-power_assert-3.0.1-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'rubygem-psych-5.3.1-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'rubygem-racc-1.8.1-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'rubygem-rake-13.3.1-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'rubygem-rbs-3.10.0-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'rubygem-rdoc-7.0.3-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'rubygem-rexml-3.4.4-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'rubygem-rss-0.3.2-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'rubygem-test-unit-3.7.5-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'rubygem-typeprof-0.31.1-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'rubygems-4.0.6-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'rubygems-devel-4.0.6-32.module+el9.8.0', 'sp':'8', 'release':'9', 'rpm_spec_vers_cmp':TRUE}
      ]
    }
  ]
};

var applicable_repo_urls = rhel_determine_applicable_repository_urls(constraints:constraints, appstreams:TRUE);
if(applicable_repo_urls == RHEL_REPOS_NO_OVERLAP_MESSAGE) exit(0, RHEL_REPO_NOT_ENABLED);

var module_ver = get_kb_item('Host/RedHat/appstream/ruby');
if (isnull(module_ver)) audit(AUDIT_PACKAGE_NOT_INSTALLED, 'Module ruby:4.0');
if ('4.0' >!< module_ver) audit(AUDIT_PACKAGE_NOT_AFFECTED, 'Module ruby:' + module_ver);

var os_release = get_one_kb_item('installed_os/local/SSH/0/release');
var os_sp = get_one_kb_item('Host/*/minor_release');

var flag = 0;
var reference;
var sp;
var _cpu;
var el_string;
var rpm_spec_vers_cmp;
var epoch;
var allowmaj;
var exists_check;
var cves;
var repo_relative_urls;
var appstreams_found = 0;
var appstream;
var appstream_name;
var appstream_version;
foreach var module (keys(constraints)) {
  appstream = NULL;
  appstream_name = NULL;
  appstream_version = NULL;
  appstream_split = split(module, sep:':', keep:FALSE);
  if (!empty_or_null(appstream_split)) {
    appstream_name = appstream_split[0];
    appstream_version = appstream_split[1];
    if (!empty_or_null(appstream_name)) appstream = get_one_kb_item('Host/RedHat/appstream/' + appstream_name);
  }
  if (!empty_or_null(appstream) && appstream_version == appstream || appstream_name == 'all') {
    appstreams_found++;
    foreach var module_array ( constraints[module] ) {
      # Check that the target release is equal to the affected release
      if (!empty_or_null(module_array['release'])){
        if (module_array['release'] != os_release) continue;
      }
      if (!empty_or_null(module_array['sp'])){
        if (module_array['sp'] != os_sp) continue;
      }
      repo_relative_urls = NULL;
      if (!empty_or_null(module_array['repo_relative_urls'])) repo_relative_urls = module_array['repo_relative_urls'];
      foreach var package_array ( module_array['pkgs'] ) {
        reference = NULL;
        sp = NULL;
        _cpu = NULL;
        el_string = NULL;
        rpm_spec_vers_cmp = NULL;
        epoch = NULL;
        allowmaj = NULL;
        exists_check = NULL;
        cves = NULL;
        if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
        if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
        if (!empty_or_null(package_array['cpu'])) _cpu = package_array['cpu'];
        if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
        if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
        if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
        if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
        if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
        if (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
        if (reference &&
            rhel_decide_repo_relative_url_check(required_repo_url_list:repo_relative_urls) &&
            (applicable_repo_urls || (!exists_check || rpm_exists(rpm:exists_check))) &&
            rpm_check(sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
      }
    }
  }
}

if (!appstreams_found) audit(AUDIT_PACKAGE_NOT_INSTALLED, 'Module ruby:4.0');

if (flag)
{
  var extra = NULL;
  if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = rpm_report_get() + redhat_report_repo_caveat();
  else extra = rpm_report_get();
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : extra
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'ruby / ruby-bundled-gems / ruby-default-gems / ruby-devel / etc');
}