RHEL 8 / 9 : Satellite 6.16.11 Async Update (Important) (RHSA-2026:42082)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2026:42082. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(328352);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/20");

  script_cve_id(
    "CVE-2026-12701",
    "CVE-2026-27145",
    "CVE-2026-33811",
    "CVE-2026-39821"
  );
  script_xref(name:"RHSA", value:"2026:42082");

  script_name(english:"RHEL 8 / 9 : Satellite 6.16.11 Async Update (Important) (RHSA-2026:42082)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 8 / 9 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2026:42082 advisory.

    Red Hat Satellite is a system management solution that allows organizations
    to configure and maintain their systems without the necessity to provide
    public Internet access to their servers or other client systems. It
    performs provisioning and configuration management of predefined standard
    operating environments.

    Security Fix(es):

    * yggdrasil-worker-forwarder: golang crypto/x509: Denial of Service via excessive processing of DNS SAN
    entries (CVE-2026-27145)

    * yggdrasil-worker-forwarder: Go net package: Denial of Service via long CNAME response in LookupCNAME
    (CVE-2026-33811)

    * yggdrasil-worker-forwarder: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label
    processing (CVE-2026-39821)

    * python-pulpcore: pulpcore: relative_path_validator bypass via directory traversal in FilesystemExport
    (CVE-2026-12701)

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=2467822");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2480756");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2484207");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2490703");
  # https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_42082.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0c945ebe");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:42082");
  script_set_attribute(attribute:"solution", value:
"Update the affected python3.11-pulpcore and / or yggdrasil-worker-forwarder packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/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:N/I:N/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-2026-33811");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(22, 606, 1289, 1341);
  script_set_attribute(attribute:"vendor_severity", value:"Important");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/05/07");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/20");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:python-pulpcore");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:python3.11-pulpcore");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:yggdrasil-worker-forwarder");
  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", "redhat_repos.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');
if (!rhel_check_release_list(operator: 'ge', os_version: os_version, rhel_versions: ['8','9'])) audit(AUDIT_OS_NOT, 'Red Hat 8.x / 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 = [
  {
    'release': '8',
    'repo_relative_urls': [
      'content/dist/layered/rhel8/x86_64/sat-capsule/6.16/debug',
      'content/dist/layered/rhel8/x86_64/sat-capsule/6.16/os',
      'content/dist/layered/rhel8/x86_64/sat-capsule/6.16/source/SRPMS',
      'content/dist/layered/rhel8/x86_64/satellite/6.16/debug',
      'content/dist/layered/rhel8/x86_64/satellite/6.16/os',
      'content/dist/layered/rhel8/x86_64/satellite/6.16/source/SRPMS',
      'content/eus/rhel8/8/x86_64/sat-capsule/6.16/debug',
      'content/eus/rhel8/8/x86_64/sat-capsule/6.16/os',
      'content/eus/rhel8/8/x86_64/sat-capsule/6.16/source/SRPMS',
      'content/eus/rhel8/8/x86_64/satellite/6.16/debug',
      'content/eus/rhel8/8/x86_64/satellite/6.16/os',
      'content/eus/rhel8/8/x86_64/satellite/6.16/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'python3.11-pulpcore-3.49.39-2.el8pc', 'el_string':'el8pc', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'satellite-6', 'cves':['CVE-2026-12701']}
    ]
  },
  {
    'release': '8',
    'repo_relative_urls': [
      'content/dist/layered/rhel8/x86_64/satellite/6.16/debug',
      'content/dist/layered/rhel8/x86_64/satellite/6.16/os',
      'content/dist/layered/rhel8/x86_64/satellite/6.16/source/SRPMS',
      'content/eus/rhel8/8/x86_64/satellite/6.16/debug',
      'content/eus/rhel8/8/x86_64/satellite/6.16/os',
      'content/eus/rhel8/8/x86_64/satellite/6.16/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'yggdrasil-worker-forwarder-0.0.4-1.el8sat', 'cpu':'x86_64', 'el_string':'el8sat', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'satellite-6', 'cves':['CVE-2026-27145', 'CVE-2026-33811', 'CVE-2026-39821']}
    ]
  },
  {
    'release': '9',
    'repo_relative_urls': [
      'content/dist/layered/rhel9/x86_64/sat-capsule/6.16/debug',
      'content/dist/layered/rhel9/x86_64/sat-capsule/6.16/os',
      'content/dist/layered/rhel9/x86_64/sat-capsule/6.16/source/SRPMS',
      'content/dist/layered/rhel9/x86_64/satellite/6.16/debug',
      'content/dist/layered/rhel9/x86_64/satellite/6.16/os',
      'content/dist/layered/rhel9/x86_64/satellite/6.16/source/SRPMS',
      'content/eus/rhel9/9/x86_64/sat-capsule/6.16/debug',
      'content/eus/rhel9/9/x86_64/sat-capsule/6.16/os',
      'content/eus/rhel9/9/x86_64/sat-capsule/6.16/source/SRPMS',
      'content/eus/rhel9/9/x86_64/satellite/6.16/debug',
      'content/eus/rhel9/9/x86_64/satellite/6.16/os',
      'content/eus/rhel9/9/x86_64/satellite/6.16/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'python3.11-pulpcore-3.49.39-2.el9pc', 'el_string':'el9pc', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'satellite-6', 'cves':['CVE-2026-12701']}
    ]
  },
  {
    'release': '9',
    'repo_relative_urls': [
      'content/dist/layered/rhel9/x86_64/satellite/6.16/debug',
      'content/dist/layered/rhel9/x86_64/satellite/6.16/os',
      'content/dist/layered/rhel9/x86_64/satellite/6.16/source/SRPMS',
      'content/eus/rhel9/9/x86_64/satellite/6.16/debug',
      'content/eus/rhel9/9/x86_64/satellite/6.16/os',
      'content/eus/rhel9/9/x86_64/satellite/6.16/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'yggdrasil-worker-forwarder-0.0.4-1.el9sat', 'cpu':'x86_64', 'el_string':'el9sat', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'satellite-6', 'cves':['CVE-2026-27145', 'CVE-2026-33811', 'CVE-2026-39821']}
    ]
  }
];

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

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 repo_relative_urls;
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;
  }

  if (!empty_or_null(constraint['repo_relative_urls'])) repo_relative_urls = constraint['repo_relative_urls'];

  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 &&
        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 (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, 'python3.11-pulpcore / yggdrasil-worker-forwarder');
}