RHEL 7 : bind (RHSA-2021:1476)

2021-05-03T00:00:00
ID REDHAT-RHSA-2021-1476.NASL
Type nessus
Reporter This script is Copyright (C) 2021 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2021-10-07T00:00:00

Description

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:1476 advisory.

  • bind: An assertion check can fail while answering queries for DNAME records that require the DNAME to be processed to resolve itself (CVE-2021-25215)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

                                        
                                            #%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2021:1476. The text
# itself is copyright (C) Red Hat, Inc.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(149243);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/10/07");

  script_cve_id("CVE-2021-25215");
  script_xref(name:"RHSA", value:"2021:1476");
  script_xref(name:"IAVA", value:"2021-A-0206");

  script_name(english:"RHEL 7 : bind (RHSA-2021:1476)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 7 host has packages installed that are affected by a vulnerability as referenced in
the RHSA-2021:1476 advisory.

  - bind: An assertion check can fail while answering queries for DNAME records that require the DNAME to be
    processed to resolve itself (CVE-2021-25215)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://cwe.mitre.org/data/definitions/617.html");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2021-25215");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2021:1476");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/1953857");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  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-2021-25215");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(617);

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/04/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/05/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/05/03");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_aus:7.2");
  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-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-libs-lite");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-license");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-lite-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-pkcs11");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-pkcs11-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-pkcs11-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-pkcs11-utils");
  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-sdb-chroot");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bind-utils");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2021 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('audit.inc');
include('global_settings.inc');
include('misc_func.inc');
include('rpm.inc');
include('rhel.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var release = get_kb_item('Host/RedHat/release');
if (isnull(release) || 'Red Hat' >!< release) audit(AUDIT_OS_NOT, 'Red Hat');
var os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
var os_ver = os_ver[1];
if (!rhel_check_release(operator: 'eq', os_version: os_ver, rhel_version: '7.2')) audit(AUDIT_OS_NOT, 'Red Hat 7.2', 'Red Hat ' + os_ver);

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, 'Red Hat', cpu);

var repositories = {
    'rhel_aus_7_2_server': [
      'rhel-7-server-aus-debug-rpms',
      'rhel-7-server-aus-debug-rpms__7_DOT_2__x86_64',
      'rhel-7-server-aus-optional-debug-rpms',
      'rhel-7-server-aus-optional-debug-rpms__7_DOT_2__x86_64',
      'rhel-7-server-aus-optional-rpms',
      'rhel-7-server-aus-optional-rpms__7_DOT_2__x86_64',
      'rhel-7-server-aus-optional-source-rpms',
      'rhel-7-server-aus-optional-source-rpms__7_DOT_2__x86_64',
      'rhel-7-server-aus-rpms',
      'rhel-7-server-aus-rpms__7_DOT_2__x86_64',
      'rhel-7-server-aus-source-rpms',
      'rhel-7-server-aus-source-rpms__7_DOT_2__x86_64'
    ]
};

var repo_sets = rhel_get_valid_repo_sets(repositories:repositories);
if(repo_sets == RHEL_REPOS_NO_OVERLAP_MESSAGE) audit(AUDIT_PACKAGE_LIST_MISSING, RHEL_REPO_AUDIT_PACKAGE_LIST_DETAILS);

var pkgs = [
    {'reference':'bind-9.9.4-29.el7_2.11', 'sp':'2', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32', 'repo_list':['rhel_aus_7_2_server']},
    {'reference':'bind-chroot-9.9.4-29.el7_2.11', 'sp':'2', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32', 'repo_list':['rhel_aus_7_2_server']},
    {'reference':'bind-devel-9.9.4-29.el7_2.11', 'sp':'2', 'cpu':'i686', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32', 'repo_list':['rhel_aus_7_2_server']},
    {'reference':'bind-devel-9.9.4-29.el7_2.11', 'sp':'2', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32', 'repo_list':['rhel_aus_7_2_server']},
    {'reference':'bind-libs-9.9.4-29.el7_2.11', 'sp':'2', 'cpu':'i686', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32', 'repo_list':['rhel_aus_7_2_server']},
    {'reference':'bind-libs-9.9.4-29.el7_2.11', 'sp':'2', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32', 'repo_list':['rhel_aus_7_2_server']},
    {'reference':'bind-libs-lite-9.9.4-29.el7_2.11', 'sp':'2', 'cpu':'i686', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32', 'repo_list':['rhel_aus_7_2_server']},
    {'reference':'bind-libs-lite-9.9.4-29.el7_2.11', 'sp':'2', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32', 'repo_list':['rhel_aus_7_2_server']},
    {'reference':'bind-license-9.9.4-29.el7_2.11', 'sp':'2', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32', 'repo_list':['rhel_aus_7_2_server']},
    {'reference':'bind-lite-devel-9.9.4-29.el7_2.11', 'sp':'2', 'cpu':'i686', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32', 'repo_list':['rhel_aus_7_2_server']},
    {'reference':'bind-lite-devel-9.9.4-29.el7_2.11', 'sp':'2', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32', 'repo_list':['rhel_aus_7_2_server']},
    {'reference':'bind-pkcs11-9.9.4-29.el7_2.11', 'sp':'2', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32', 'repo_list':['rhel_aus_7_2_server']},
    {'reference':'bind-pkcs11-devel-9.9.4-29.el7_2.11', 'sp':'2', 'cpu':'i686', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32', 'repo_list':['rhel_aus_7_2_server']},
    {'reference':'bind-pkcs11-devel-9.9.4-29.el7_2.11', 'sp':'2', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32', 'repo_list':['rhel_aus_7_2_server']},
    {'reference':'bind-pkcs11-libs-9.9.4-29.el7_2.11', 'sp':'2', 'cpu':'i686', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32', 'repo_list':['rhel_aus_7_2_server']},
    {'reference':'bind-pkcs11-libs-9.9.4-29.el7_2.11', 'sp':'2', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32', 'repo_list':['rhel_aus_7_2_server']},
    {'reference':'bind-pkcs11-utils-9.9.4-29.el7_2.11', 'sp':'2', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32', 'repo_list':['rhel_aus_7_2_server']},
    {'reference':'bind-sdb-9.9.4-29.el7_2.11', 'sp':'2', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32', 'repo_list':['rhel_aus_7_2_server']},
    {'reference':'bind-sdb-chroot-9.9.4-29.el7_2.11', 'sp':'2', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32', 'repo_list':['rhel_aus_7_2_server']},
    {'reference':'bind-utils-9.9.4-29.el7_2.11', 'sp':'2', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32', 'repo_list':['rhel_aus_7_2_server']}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var reference = NULL;
  var release = 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 repo_list = NULL;
  if (!empty_or_null(package_array['repo_list'])) repo_list = package_array['repo_list'];
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) release = 'RHEL' + package_array['release'];
  if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
  if (!empty_or_null(package_array['cpu'])) cpu = package_array['cpu'];
  if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
  if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
  if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
  if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
  if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
  if (reference &&
      release &&
      (rhel_decide_repo_check(repo_list:repo_list, repo_sets:repo_sets) || (!exists_check || rpm_exists(release:release, rpm:exists_check))) &&
      rpm_check(release:release, sp:sp, cpu:cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) flag++;
}

if (flag)
{
  var subscription_caveat = '\n' +
    'NOTE: This vulnerability check contains fixes that apply to\n' +
    'packages only available in the Red Hat Enterprise Linux\n' +
    'Advanced Update Support repository.\n' +
    'Access to this repository requires a paid RHEL subscription.\n';
  var extra = NULL;
  if (empty_or_null(repo_sets)) extra = subscription_caveat + rpm_report_get() + redhat_report_repo_caveat();
  else extra = subscription_caveat + rpm_report_get() + redhat_report_package_caveat();
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      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-libs / bind-libs-lite / etc');
}