Fedora 43 : unbound (2026-3223ded15e)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##
# The descriptive text and package checks in this plugin were
# extracted from Fedora Security Advisory FEDORA-2026-3223ded15e
#

include('compat.inc');

if (description)
{
  script_id(318268);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/03");

  script_cve_id(
    "CVE-2026-32792",
    "CVE-2026-33278",
    "CVE-2026-40622",
    "CVE-2026-41292",
    "CVE-2026-42534",
    "CVE-2026-42923",
    "CVE-2026-42944",
    "CVE-2026-42959",
    "CVE-2026-42960",
    "CVE-2026-44390",
    "CVE-2026-44608"
  );
  script_xref(name:"FEDORA", value:"2026-3223ded15e");

  script_name(english:"Fedora 43 : unbound (2026-3223ded15e)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Fedora host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the
FEDORA-2026-3223ded15e advisory.

    # Update to 1.25.1 (rhbz#2480119)


    - Fix [CVE-2026-33278](https://nlnetlabs.nl/downloads/unbound/CVE-2026-33278.txt), Possible remote code
    execution during DNSSEC validation. Thanks to Qifan Zhang, Palo Alto Networks, for the report.
    - Fix [CVE-2026-42944](https://nlnetlabs.nl/downloads/unbound/CVE-2026-42944.txt), Heap overflow and crash
    with multiple nsid, cookie, padding EDNS options. Thanks to Qifan Zhang, Palo Alto Networks, for the
    report.
    - Fix [CVE-2026-42959](https://nlnetlabs.nl/downloads/unbound/CVE-2026-42959.txt), Crash during DNSSEC
    validation of malicious content. Thanks to Qifan Zhang, Palo Alto Networks, for the report.
    - Fix [CVE-2026-32792](https://nlnetlabs.nl/downloads/unbound/CVE-2026-32792.txt), Packet of death with
    DNSCrypt. Thanks to Andrew Griffiths from 'calif.io' for the report.
    - Fix [CVE-2026-40622](https://nlnetlabs.nl/downloads/unbound/CVE-2026-40622.txt), Ghost domain name
    variant. Thanks to Qifan Zhang, Palo Alto Networks, for the report.
    - Fix [CVE-2026-41292](https://nlnetlabs.nl/downloads/unbound/CVE-2026-41292.txt), Parsing a long list of
    incoming EDNS options degrades performance. Thanks to GitHub user 'N0zoM1z0', also Qifan Zhang from Palo
    Alto Networks, for the report.
    - Fix [CVE-2026-42534](https://nlnetlabs.nl/downloads/unbound/CVE-2026-42534.txt), Jostle logic bypass
    degrades resolution performance. Thanks to Qifan Zhang, Palo Alto Networks, for the report.
    - Fix [CVE-2026-42923](https://nlnetlabs.nl/downloads/unbound/CVE-2026-42923.txt), Degradation of service
    with unbounded NSEC3 hash calculations. Thanks to Qifan Zhang, Palo Alto Networks, for the report.
    - Fix [CVE-2026-42960](https://nlnetlabs.nl/downloads/unbound/CVE-2026-42960.txt), Possible cache
    poisoning attack while following delegation. Thanks to TaoFei Guo from Peking University, Yang Luo and
    JianJun Chen, Tsinghua University, for the report.
    - Fix [CVE-2026-44390](https://nlnetlabs.nl/downloads/unbound/CVE-2026-44390.txt), Unbounded name
    compression in certain cases causes degradation of service. Thanks to Qifan Zhang, Palo Alto Networks, for
    the report.
    - Fix [CVE-2026-44608](https://nlnetlabs.nl/downloads/unbound/CVE-2026-44608.txt), Use after free and
    crash in RPZ code. Thanks to Qifan Zhang, Palo Alto Networks, for the report.

    Swapped sources signature source number with systemd unit to have them
    close.

Tenable has extracted the preceding description block directly from the Fedora 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://bodhi.fedoraproject.org/updates/FEDORA-2026-3223ded15e");
  script_set_attribute(attribute:"solution", value:
"Update the affected unbound package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/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:C/C:N/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-33278");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-42960");

  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:"2026/05/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/05/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/03");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:43");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:unbound");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Fedora 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");

  exit(0);
}


include('rpm2.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) || 'Fedora' >!< os_product) audit(AUDIT_OS_NOT, 'Fedora');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'Fedora');
if (! preg(pattern:"^43([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'Fedora 43', 'Fedora ' + 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) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Fedora', cpu);

var constraints = [
  {
    'release': '43',
    'pkgs': [
      {'reference':'unbound-1.25.1-1.fc43', 'rpm_spec_vers_cmp':TRUE}
    ]
  }
];

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, 'unbound');
}