RHCOS 4 : OpenShift Container Platform 4.8.15 (RHSA-2021:3820)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2021:3820. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(312512);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/06");

  script_cve_id(
    "CVE-2021-21670",
    "CVE-2021-21671",
    "CVE-2021-33195",
    "CVE-2021-33197",
    "CVE-2021-33198",
    "CVE-2021-34558"
  );
  script_xref(name:"RHSA", value:"2021:3820");

  script_name(english:"RHCOS 4 : OpenShift Container Platform 4.8.15 (RHSA-2021:3820)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat CoreOS host is missing one or more security updates for OpenShift Container Platform 4.8.15.");
  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-2021:3820 advisory.

  - jenkins: improper permission checks allow canceling queue items and aborting builds (CVE-2021-21670)

  - jenkins: session fixation vulnerability (CVE-2021-21671)

  - golang: net: lookup functions may return invalid host names (CVE-2021-33195)

  - golang: net/http/httputil: ReverseProxy forwards connection headers if first one is empty (CVE-2021-33197)

  - golang: math/big.Rat: may cause a panic or an unrecoverable fatal error if passed inputs with very large
    exponents (CVE-2021-33198)

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/#moderate");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1983596");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1989564");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1989570");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1989575");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2007749");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2007750");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2013510");
  # https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_3820.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?dc99e2e0");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2021:3820");
  script_set_attribute(attribute:"solution", value:
"Update the RHCOS OpenShift Container Platform 4.8.15 packages based on the guidance in RHSA-2021:3820.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-33195");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2021-21671");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(20, 384, 400, 863);
  script_set_attribute(attribute:"vendor_severity", value:"Moderate");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/06/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/10/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/05/06");

  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:"p-cpe:/a:redhat:enterprise_linux:butane");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:jenkins");
  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: '4.8')) audit(AUDIT_OS_NOT, 'Red Hat CoreOS 4.8', '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':'butane-0.12.1-2.rhaos4.8.el8', 'cpu':'ppc64le', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube', 'cves':['CVE-2021-33195', 'CVE-2021-33197', 'CVE-2021-33198', 'CVE-2021-34558']},
      {'reference':'butane-0.12.1-2.rhaos4.8.el8', 'cpu':'s390x', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube', 'cves':['CVE-2021-33195', 'CVE-2021-33197', 'CVE-2021-33198', 'CVE-2021-34558']},
      {'reference':'butane-0.12.1-2.rhaos4.8.el8', 'cpu':'x86_64', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube', 'cves':['CVE-2021-33195', 'CVE-2021-33197', 'CVE-2021-33198', 'CVE-2021-34558']},
      {'reference':'jenkins-2.289.3.1633554819-1.el8', 'el_string':'el8', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'openshift-hyperkube', 'cves':['CVE-2021-21670', 'CVE-2021-21671']}
    ]
  }
];

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, 'butane / jenkins');
}