RHEL 6 : bind and bind-dyndb-ldap (RHSA-2025:0039)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2025:0039. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(213505);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/12/24");

  script_cve_id(
    "CVE-2023-3341",
    "CVE-2023-4408",
    "CVE-2023-50387",
    "CVE-2023-50868"
  );
  script_xref(name:"RHSA", value:"2025:0039");

  script_name(english:"RHEL 6 : bind and bind-dyndb-ldap (RHSA-2025:0039)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for bind / bind-dyndb-ldap.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2025:0039 advisory.

    The Berkeley Internet Name Domain (BIND) is an implementation of the Domain Name System (DNS) protocols.
    BIND includes a DNS server (named); a resolver library (routines for applications to use when interfacing
    with DNS); and tools for verifying that the DNS server is operating correctly.

    Security Fix(es):

    * bind: stack exhaustion in control channel code may lead to DoS (CVE-2023-3341)

    * bind9: Parsing large DNS messages may cause excessive CPU load (CVE-2023-4408)

    * bind9: KeyTrap - Extreme CPU consumption in DNSSEC validator (CVE-2023-50387)

    * bind9: Preparing an NSEC3 closest encloser proof can exhaust CPU resources (CVE-2023-50868)

    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=2239621");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2263896");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2263914");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2263917");
  # https://security.access.redhat.com/data/csaf/v2/advisories/2025/rhsa-2025_0039.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d6f9af2f");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2025:0039");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL bind / bind-dyndb-ldap packages based on the guidance in RHSA-2025:0039.");
  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:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-50868");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2023/09/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/01/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/01/06");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_els:6");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-chroot");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-dyndb-ldap");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-sdb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-utils");
  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) 2025 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_release = get_kb_item('installed_os/local/SSH/0/release');
if (isnull(os_release)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
if (!rhel_check_release(operator: 'ge', os_version: os_release, rhel_version: '6')) audit(AUDIT_OS_NOT, 'Red Hat 6.x', 'Red Hat ' + os_release);

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': '6',
    'repo_relative_urls': [
      'content/els/rhel/server/6/6Server/i386/debug',
      'content/els/rhel/server/6/6Server/i386/extended-optional/debug',
      'content/els/rhel/server/6/6Server/i386/extended-optional/os',
      'content/els/rhel/server/6/6Server/i386/extended-optional/source/SRPMS',
      'content/els/rhel/server/6/6Server/i386/extended/debug',
      'content/els/rhel/server/6/6Server/i386/extended/os',
      'content/els/rhel/server/6/6Server/i386/extended/source/SRPMS',
      'content/els/rhel/server/6/6Server/i386/optional/debug',
      'content/els/rhel/server/6/6Server/i386/optional/os',
      'content/els/rhel/server/6/6Server/i386/optional/source/SRPMS',
      'content/els/rhel/server/6/6Server/i386/os',
      'content/els/rhel/server/6/6Server/i386/source/SRPMS',
      'content/els/rhel/server/6/6Server/x86_64/debug',
      'content/els/rhel/server/6/6Server/x86_64/extended-optional/debug',
      'content/els/rhel/server/6/6Server/x86_64/extended-optional/os',
      'content/els/rhel/server/6/6Server/x86_64/extended-optional/source/SRPMS',
      'content/els/rhel/server/6/6Server/x86_64/extended/debug',
      'content/els/rhel/server/6/6Server/x86_64/extended/os',
      'content/els/rhel/server/6/6Server/x86_64/extended/source/SRPMS',
      'content/els/rhel/server/6/6Server/x86_64/optional/debug',
      'content/els/rhel/server/6/6Server/x86_64/optional/os',
      'content/els/rhel/server/6/6Server/x86_64/optional/source/SRPMS',
      'content/els/rhel/server/6/6Server/x86_64/os',
      'content/els/rhel/server/6/6Server/x86_64/source/SRPMS',
      'content/els/rhel/system-z/6/6Server/s390x/debug',
      'content/els/rhel/system-z/6/6Server/s390x/extended-optional/debug',
      'content/els/rhel/system-z/6/6Server/s390x/extended-optional/os',
      'content/els/rhel/system-z/6/6Server/s390x/extended-optional/source/SRPMS',
      'content/els/rhel/system-z/6/6Server/s390x/extended/debug',
      'content/els/rhel/system-z/6/6Server/s390x/extended/os',
      'content/els/rhel/system-z/6/6Server/s390x/extended/source/SRPMS',
      'content/els/rhel/system-z/6/6Server/s390x/optional/debug',
      'content/els/rhel/system-z/6/6Server/s390x/optional/os',
      'content/els/rhel/system-z/6/6Server/s390x/optional/source/SRPMS',
      'content/els/rhel/system-z/6/6Server/s390x/os',
      'content/els/rhel/system-z/6/6Server/s390x/source/SRPMS',
      'content/retired-els/rhel/server/6/6Server/x86_64/debug',
      'content/retired-els/rhel/server/6/6Server/x86_64/optional/debug',
      'content/retired-els/rhel/server/6/6Server/x86_64/optional/os',
      'content/retired-els/rhel/server/6/6Server/x86_64/optional/source/SRPMS',
      'content/retired-els/rhel/server/6/6Server/x86_64/os',
      'content/retired-els/rhel/server/6/6Server/x86_64/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'bind-9.8.2-0.68.rc1.el6_10.14', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-9.8.2-0.68.rc1.el6_10.14', 'cpu':'s390x', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-9.8.2-0.68.rc1.el6_10.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-chroot-9.8.2-0.68.rc1.el6_10.14', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-chroot-9.8.2-0.68.rc1.el6_10.14', 'cpu':'s390x', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-chroot-9.8.2-0.68.rc1.el6_10.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-devel-9.8.2-0.68.rc1.el6_10.14', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-devel-9.8.2-0.68.rc1.el6_10.14', 'cpu':'s390', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-devel-9.8.2-0.68.rc1.el6_10.14', 'cpu':'s390x', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-devel-9.8.2-0.68.rc1.el6_10.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-dyndb-ldap-2.3-8.el6_10.1', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'bind-dyndb-ldap-2.3-8.el6_10.1', 'cpu':'s390x', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'bind-dyndb-ldap-2.3-8.el6_10.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'bind-libs-9.8.2-0.68.rc1.el6_10.14', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-libs-9.8.2-0.68.rc1.el6_10.14', 'cpu':'s390', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-libs-9.8.2-0.68.rc1.el6_10.14', 'cpu':'s390x', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-libs-9.8.2-0.68.rc1.el6_10.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-sdb-9.8.2-0.68.rc1.el6_10.14', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-sdb-9.8.2-0.68.rc1.el6_10.14', 'cpu':'s390x', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-sdb-9.8.2-0.68.rc1.el6_10.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-utils-9.8.2-0.68.rc1.el6_10.14', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-utils-9.8.2-0.68.rc1.el6_10.14', 'cpu':'s390x', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-utils-9.8.2-0.68.rc1.el6_10.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'}
    ]
  }
];

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 flag = 0;
var repo_relative_urls;

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['repo_relative_urls'])) repo_relative_urls = constraint['repo_relative_urls'];

  foreach var pkg ( constraint['pkgs'] ) {
    var reference = NULL;
    var sp = NULL;
    var _cpu = NULL;
    var el_string = NULL;
    var rpm_spec_vers_cmp = NULL;
    var epoch = NULL;
    var allowmaj = NULL;
    var exists_check = NULL;
    var 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, 'bind / bind-chroot / bind-devel / bind-dyndb-ldap / bind-libs / etc');
}