RHCOS 4 : OpenShift Container Platform 4.20.38 (RHSA-2026:66375)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2026:66375. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(345857);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/15");

  script_cve_id(
    "CVE-2026-33818",
    "CVE-2026-39822",
    "CVE-2026-42504",
    "CVE-2026-56858",
    "CVE-2026-56859",
    "CVE-2026-56860",
    "CVE-2026-56862"
  );
  script_xref(name:"RHSA", value:"2026:66375");

  script_name(english:"RHCOS 4 : OpenShift Container Platform 4.20.38 (RHSA-2026:66375)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat CoreOS host is missing one or more security updates for OpenShift Container Platform 4.20.38.");
  script_set_attribute(attribute:"description", value:
"The remote Red Hat Enterprise Linux CoreOS 4 host has packages installed that are affected by multiple vulnerabilities
as referenced in the RHSA-2026:66375 advisory.

  - encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal
    (CVE-2026-33818)

  - golang: Go os.Root: Symlink following vulnerability allows directory traversal (CVE-2026-39822)

  - mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header (CVE-2026-42504)

  - html/template: golang: Go html/template: Cross-Site Scripting via pathological input (CVE-2026-56858)

  - encoding/xml: golang: Go: Denial of Service via XML decoding recursion depth issue (CVE-2026-56859)

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=2484204");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2498152");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2515815");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2515820");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2515838");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2515839");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2515840");
  # https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_66375.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a1b5fa3d");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:66375");
  script_set_attribute(attribute:"solution", value:
"Update the RHCOS OpenShift Container Platform 4.20.38 packages based on the guidance in RHSA-2026:66375.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-56858");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-39822");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(59, 79, 770, 776, 1050);
  script_set_attribute(attribute:"vendor_severity", value:"Important");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/06/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/15");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:8:coreos");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:9:coreos");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openshift");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openshift-hyperkube");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openshift-kube-apiserver");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openshift-kube-controller-manager");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openshift-kube-scheduler");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openshift-kubelet");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Red Hat Local Security Checks");

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

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");

  exit(0);
}


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 CoreOS');
if (!rhel_check_release(operator: 'eq', os_version: os_version, rhel_version: '4.20')) audit(AUDIT_OS_NOT, 'Red Hat CoreOS 4.20', 'Red Hat CoreOS ' + 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 CoreOS', cpu);

var constraints = [
  {
    'release': '4',
    'pkgs': [
      {'reference':'openshift-hyperkube-4.20.0-202609041738.p2.g4012064.assembly.stream.el8', 'cpu':'aarch64', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-hyperkube-4.20.0-202609041738.p2.g4012064.assembly.stream.el8', 'cpu':'ppc64le', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-hyperkube-4.20.0-202609041738.p2.g4012064.assembly.stream.el8', 'cpu':'s390x', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-hyperkube-4.20.0-202609041738.p2.g4012064.assembly.stream.el8', 'cpu':'x86_64', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-hyperkube-4.20.0-202609041738.p2.g4012064.assembly.stream.el9', 'cpu':'aarch64', 'el_string':'el9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-hyperkube-4.20.0-202609041738.p2.g4012064.assembly.stream.el9', 'cpu':'ppc64le', 'el_string':'el9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-hyperkube-4.20.0-202609041738.p2.g4012064.assembly.stream.el9', 'cpu':'s390x', 'el_string':'el9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-hyperkube-4.20.0-202609041738.p2.g4012064.assembly.stream.el9', 'cpu':'x86_64', 'el_string':'el9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-apiserver-4.20.0-202609041738.p2.g4012064.assembly.stream.el8', 'cpu':'aarch64', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-apiserver-4.20.0-202609041738.p2.g4012064.assembly.stream.el8', 'cpu':'ppc64le', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-apiserver-4.20.0-202609041738.p2.g4012064.assembly.stream.el8', 'cpu':'s390x', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-apiserver-4.20.0-202609041738.p2.g4012064.assembly.stream.el8', 'cpu':'x86_64', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-apiserver-4.20.0-202609041738.p2.g4012064.assembly.stream.el9', 'cpu':'aarch64', 'el_string':'el9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-apiserver-4.20.0-202609041738.p2.g4012064.assembly.stream.el9', 'cpu':'ppc64le', 'el_string':'el9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-apiserver-4.20.0-202609041738.p2.g4012064.assembly.stream.el9', 'cpu':'s390x', 'el_string':'el9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-apiserver-4.20.0-202609041738.p2.g4012064.assembly.stream.el9', 'cpu':'x86_64', 'el_string':'el9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-controller-manager-4.20.0-202609041738.p2.g4012064.assembly.stream.el8', 'cpu':'aarch64', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-controller-manager-4.20.0-202609041738.p2.g4012064.assembly.stream.el8', 'cpu':'ppc64le', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-controller-manager-4.20.0-202609041738.p2.g4012064.assembly.stream.el8', 'cpu':'s390x', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-controller-manager-4.20.0-202609041738.p2.g4012064.assembly.stream.el8', 'cpu':'x86_64', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-controller-manager-4.20.0-202609041738.p2.g4012064.assembly.stream.el9', 'cpu':'aarch64', 'el_string':'el9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-controller-manager-4.20.0-202609041738.p2.g4012064.assembly.stream.el9', 'cpu':'ppc64le', 'el_string':'el9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-controller-manager-4.20.0-202609041738.p2.g4012064.assembly.stream.el9', 'cpu':'s390x', 'el_string':'el9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-controller-manager-4.20.0-202609041738.p2.g4012064.assembly.stream.el9', 'cpu':'x86_64', 'el_string':'el9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-scheduler-4.20.0-202609041738.p2.g4012064.assembly.stream.el8', 'cpu':'aarch64', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-scheduler-4.20.0-202609041738.p2.g4012064.assembly.stream.el8', 'cpu':'ppc64le', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-scheduler-4.20.0-202609041738.p2.g4012064.assembly.stream.el8', 'cpu':'s390x', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-scheduler-4.20.0-202609041738.p2.g4012064.assembly.stream.el8', 'cpu':'x86_64', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-scheduler-4.20.0-202609041738.p2.g4012064.assembly.stream.el9', 'cpu':'aarch64', 'el_string':'el9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-scheduler-4.20.0-202609041738.p2.g4012064.assembly.stream.el9', 'cpu':'ppc64le', 'el_string':'el9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-scheduler-4.20.0-202609041738.p2.g4012064.assembly.stream.el9', 'cpu':'s390x', 'el_string':'el9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kube-scheduler-4.20.0-202609041738.p2.g4012064.assembly.stream.el9', 'cpu':'x86_64', 'el_string':'el9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kubelet-4.20.0-202609041738.p2.g4012064.assembly.stream.el8', 'cpu':'aarch64', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kubelet-4.20.0-202609041738.p2.g4012064.assembly.stream.el8', 'cpu':'ppc64le', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kubelet-4.20.0-202609041738.p2.g4012064.assembly.stream.el8', 'cpu':'s390x', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kubelet-4.20.0-202609041738.p2.g4012064.assembly.stream.el8', 'cpu':'x86_64', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kubelet-4.20.0-202609041738.p2.g4012064.assembly.stream.el9', 'cpu':'aarch64', 'el_string':'el9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kubelet-4.20.0-202609041738.p2.g4012064.assembly.stream.el9', 'cpu':'ppc64le', 'el_string':'el9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kubelet-4.20.0-202609041738.p2.g4012064.assembly.stream.el9', 'cpu':'s390x', 'el_string':'el9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'},
      {'reference':'openshift-kubelet-4.20.0-202609041738.p2.g4012064.assembly.stream.el9', 'cpu':'x86_64', 'el_string':'el9', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube'}
    ]
  }
];

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;
foreach var constraint ( constraints ) {
  # Check that the target release is equal to the affected release
  if (!empty_or_null(constraint['release'])){
    if (constraint['release'] != os_release) continue;
  }
  if (!empty_or_null(constraint['sp'])){
    if (constraint['sp'] != os_sp) continue;
  }
  foreach var pkg ( constraint['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(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        ## (no known rpm to check OR known rpm_exists)
        (!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 (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'openshift-hyperkube / openshift-kube-apiserver / etc');
}