RHEL 8 : gnutls (RHSA-2023:3361)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2023:3361. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(176650);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/26");

  script_cve_id("CVE-2023-0361");
  script_xref(name:"RHSA", value:"2023:3361");

  script_name(english:"RHEL 8 : gnutls (RHSA-2023:3361)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing a security update for gnutls.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in
the RHSA-2023:3361 advisory.

  - A timing side-channel in the handling of RSA ClientKeyExchange messages was discovered in GnuTLS. This
    side-channel can be sufficient to recover the key encrypted in the RSA ciphertext across a network in a
    Bleichenbacher style attack. To achieve a successful decryption the attacker would need to send a large
    amount of specially crafted messages to the vulnerable server. By recovering the secret from the
    ClientKeyExchange message, the attacker would be able to decrypt the application data exchanged over that
    connection. (CVE-2023-0361)

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://access.redhat.com/security/cve/CVE-2023-0361");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2023:3361");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL gnutls package based on the guidance in RHSA-2023:3361.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:N");
  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:N/S:U/C:H/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-0361");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(203, 1300);
  script_set_attribute(attribute:"vendor_severity", value:"Moderate");

  script_set_attribute(attribute:"vuln_publication_date", value:"2023/02/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/05/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/06/03");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_aus:8.6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_e4s:8.6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_eus:8.6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_tus:8.6");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gnutls");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gnutls-c++");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gnutls-dane");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gnutls-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gnutls-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) 2023-2024 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('rpm.inc');
include('rhel.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/RedHat/release');
if (isnull(os_release) || 'Red Hat' >!< os_release) audit(AUDIT_OS_NOT, 'Red Hat');
var os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
os_ver = os_ver[1];
if (!rhel_check_release(operator: 'eq', os_version: os_ver, rhel_version: '8.6')) audit(AUDIT_OS_NOT, 'Red Hat 8.6', '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 && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);

var constraints = [
  {
    'repo_relative_urls': [
      'content/aus/rhel8/8.6/x86_64/appstream/debug',
      'content/aus/rhel8/8.6/x86_64/appstream/os',
      'content/aus/rhel8/8.6/x86_64/appstream/source/SRPMS',
      'content/aus/rhel8/8.6/x86_64/baseos/debug',
      'content/aus/rhel8/8.6/x86_64/baseos/os',
      'content/aus/rhel8/8.6/x86_64/baseos/source/SRPMS',
      'content/e4s/rhel8/8.6/ppc64le/appstream/debug',
      'content/e4s/rhel8/8.6/ppc64le/appstream/os',
      'content/e4s/rhel8/8.6/ppc64le/appstream/source/SRPMS',
      'content/e4s/rhel8/8.6/ppc64le/baseos/debug',
      'content/e4s/rhel8/8.6/ppc64le/baseos/os',
      'content/e4s/rhel8/8.6/ppc64le/baseos/source/SRPMS',
      'content/e4s/rhel8/8.6/ppc64le/highavailability/debug',
      'content/e4s/rhel8/8.6/ppc64le/highavailability/os',
      'content/e4s/rhel8/8.6/ppc64le/highavailability/source/SRPMS',
      'content/e4s/rhel8/8.6/ppc64le/sap-solutions/debug',
      'content/e4s/rhel8/8.6/ppc64le/sap-solutions/os',
      'content/e4s/rhel8/8.6/ppc64le/sap-solutions/source/SRPMS',
      'content/e4s/rhel8/8.6/ppc64le/sap/debug',
      'content/e4s/rhel8/8.6/ppc64le/sap/os',
      'content/e4s/rhel8/8.6/ppc64le/sap/source/SRPMS',
      'content/e4s/rhel8/8.6/x86_64/appstream/debug',
      'content/e4s/rhel8/8.6/x86_64/appstream/os',
      'content/e4s/rhel8/8.6/x86_64/appstream/source/SRPMS',
      'content/e4s/rhel8/8.6/x86_64/baseos/debug',
      'content/e4s/rhel8/8.6/x86_64/baseos/os',
      'content/e4s/rhel8/8.6/x86_64/baseos/source/SRPMS',
      'content/e4s/rhel8/8.6/x86_64/highavailability/debug',
      'content/e4s/rhel8/8.6/x86_64/highavailability/os',
      'content/e4s/rhel8/8.6/x86_64/highavailability/source/SRPMS',
      'content/e4s/rhel8/8.6/x86_64/sap-solutions/debug',
      'content/e4s/rhel8/8.6/x86_64/sap-solutions/os',
      'content/e4s/rhel8/8.6/x86_64/sap-solutions/source/SRPMS',
      'content/e4s/rhel8/8.6/x86_64/sap/debug',
      'content/e4s/rhel8/8.6/x86_64/sap/os',
      'content/e4s/rhel8/8.6/x86_64/sap/source/SRPMS',
      'content/eus/rhel8/8.6/aarch64/appstream/debug',
      'content/eus/rhel8/8.6/aarch64/appstream/os',
      'content/eus/rhel8/8.6/aarch64/appstream/source/SRPMS',
      'content/eus/rhel8/8.6/aarch64/baseos/debug',
      'content/eus/rhel8/8.6/aarch64/baseos/os',
      'content/eus/rhel8/8.6/aarch64/baseos/source/SRPMS',
      'content/eus/rhel8/8.6/aarch64/codeready-builder/debug',
      'content/eus/rhel8/8.6/aarch64/codeready-builder/os',
      'content/eus/rhel8/8.6/aarch64/codeready-builder/source/SRPMS',
      'content/eus/rhel8/8.6/aarch64/highavailability/debug',
      'content/eus/rhel8/8.6/aarch64/highavailability/os',
      'content/eus/rhel8/8.6/aarch64/highavailability/source/SRPMS',
      'content/eus/rhel8/8.6/aarch64/supplementary/debug',
      'content/eus/rhel8/8.6/aarch64/supplementary/os',
      'content/eus/rhel8/8.6/aarch64/supplementary/source/SRPMS',
      'content/eus/rhel8/8.6/ppc64le/appstream/debug',
      'content/eus/rhel8/8.6/ppc64le/appstream/os',
      'content/eus/rhel8/8.6/ppc64le/appstream/source/SRPMS',
      'content/eus/rhel8/8.6/ppc64le/baseos/debug',
      'content/eus/rhel8/8.6/ppc64le/baseos/os',
      'content/eus/rhel8/8.6/ppc64le/baseos/source/SRPMS',
      'content/eus/rhel8/8.6/ppc64le/codeready-builder/debug',
      'content/eus/rhel8/8.6/ppc64le/codeready-builder/os',
      'content/eus/rhel8/8.6/ppc64le/codeready-builder/source/SRPMS',
      'content/eus/rhel8/8.6/ppc64le/highavailability/debug',
      'content/eus/rhel8/8.6/ppc64le/highavailability/os',
      'content/eus/rhel8/8.6/ppc64le/highavailability/source/SRPMS',
      'content/eus/rhel8/8.6/ppc64le/resilientstorage/debug',
      'content/eus/rhel8/8.6/ppc64le/resilientstorage/os',
      'content/eus/rhel8/8.6/ppc64le/resilientstorage/source/SRPMS',
      'content/eus/rhel8/8.6/ppc64le/sap-solutions/debug',
      'content/eus/rhel8/8.6/ppc64le/sap-solutions/os',
      'content/eus/rhel8/8.6/ppc64le/sap-solutions/source/SRPMS',
      'content/eus/rhel8/8.6/ppc64le/sap/debug',
      'content/eus/rhel8/8.6/ppc64le/sap/os',
      'content/eus/rhel8/8.6/ppc64le/sap/source/SRPMS',
      'content/eus/rhel8/8.6/ppc64le/supplementary/debug',
      'content/eus/rhel8/8.6/ppc64le/supplementary/os',
      'content/eus/rhel8/8.6/ppc64le/supplementary/source/SRPMS',
      'content/eus/rhel8/8.6/s390x/appstream/debug',
      'content/eus/rhel8/8.6/s390x/appstream/os',
      'content/eus/rhel8/8.6/s390x/appstream/source/SRPMS',
      'content/eus/rhel8/8.6/s390x/baseos/debug',
      'content/eus/rhel8/8.6/s390x/baseos/os',
      'content/eus/rhel8/8.6/s390x/baseos/source/SRPMS',
      'content/eus/rhel8/8.6/s390x/codeready-builder/debug',
      'content/eus/rhel8/8.6/s390x/codeready-builder/os',
      'content/eus/rhel8/8.6/s390x/codeready-builder/source/SRPMS',
      'content/eus/rhel8/8.6/s390x/highavailability/debug',
      'content/eus/rhel8/8.6/s390x/highavailability/os',
      'content/eus/rhel8/8.6/s390x/highavailability/source/SRPMS',
      'content/eus/rhel8/8.6/s390x/resilientstorage/debug',
      'content/eus/rhel8/8.6/s390x/resilientstorage/os',
      'content/eus/rhel8/8.6/s390x/resilientstorage/source/SRPMS',
      'content/eus/rhel8/8.6/s390x/sap/debug',
      'content/eus/rhel8/8.6/s390x/sap/os',
      'content/eus/rhel8/8.6/s390x/sap/source/SRPMS',
      'content/eus/rhel8/8.6/s390x/supplementary/debug',
      'content/eus/rhel8/8.6/s390x/supplementary/os',
      'content/eus/rhel8/8.6/s390x/supplementary/source/SRPMS',
      'content/eus/rhel8/8.6/x86_64/appstream/debug',
      'content/eus/rhel8/8.6/x86_64/appstream/os',
      'content/eus/rhel8/8.6/x86_64/appstream/source/SRPMS',
      'content/eus/rhel8/8.6/x86_64/baseos/debug',
      'content/eus/rhel8/8.6/x86_64/baseos/os',
      'content/eus/rhel8/8.6/x86_64/baseos/source/SRPMS',
      'content/eus/rhel8/8.6/x86_64/codeready-builder/debug',
      'content/eus/rhel8/8.6/x86_64/codeready-builder/os',
      'content/eus/rhel8/8.6/x86_64/codeready-builder/source/SRPMS',
      'content/eus/rhel8/8.6/x86_64/highavailability/debug',
      'content/eus/rhel8/8.6/x86_64/highavailability/os',
      'content/eus/rhel8/8.6/x86_64/highavailability/source/SRPMS',
      'content/eus/rhel8/8.6/x86_64/resilientstorage/debug',
      'content/eus/rhel8/8.6/x86_64/resilientstorage/os',
      'content/eus/rhel8/8.6/x86_64/resilientstorage/source/SRPMS',
      'content/eus/rhel8/8.6/x86_64/sap-solutions/debug',
      'content/eus/rhel8/8.6/x86_64/sap-solutions/os',
      'content/eus/rhel8/8.6/x86_64/sap-solutions/source/SRPMS',
      'content/eus/rhel8/8.6/x86_64/sap/debug',
      'content/eus/rhel8/8.6/x86_64/sap/os',
      'content/eus/rhel8/8.6/x86_64/sap/source/SRPMS',
      'content/eus/rhel8/8.6/x86_64/supplementary/debug',
      'content/eus/rhel8/8.6/x86_64/supplementary/os',
      'content/eus/rhel8/8.6/x86_64/supplementary/source/SRPMS',
      'content/tus/rhel8/8.6/x86_64/appstream/debug',
      'content/tus/rhel8/8.6/x86_64/appstream/os',
      'content/tus/rhel8/8.6/x86_64/appstream/source/SRPMS',
      'content/tus/rhel8/8.6/x86_64/baseos/debug',
      'content/tus/rhel8/8.6/x86_64/baseos/os',
      'content/tus/rhel8/8.6/x86_64/baseos/source/SRPMS',
      'content/tus/rhel8/8.6/x86_64/highavailability/debug',
      'content/tus/rhel8/8.6/x86_64/highavailability/os',
      'content/tus/rhel8/8.6/x86_64/highavailability/source/SRPMS',
      'content/tus/rhel8/8.6/x86_64/nfv/debug',
      'content/tus/rhel8/8.6/x86_64/nfv/os',
      'content/tus/rhel8/8.6/x86_64/nfv/source/SRPMS',
      'content/tus/rhel8/8.6/x86_64/rt/debug',
      'content/tus/rhel8/8.6/x86_64/rt/os',
      'content/tus/rhel8/8.6/x86_64/rt/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'gnutls-3.6.16-5.el8_6.1', 'sp':'6', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gnutls-c++-3.6.16-5.el8_6.1', 'sp':'6', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gnutls-dane-3.6.16-5.el8_6.1', 'sp':'6', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gnutls-devel-3.6.16-5.el8_6.1', 'sp':'6', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gnutls-utils-3.6.16-5.el8_6.1', 'sp':'6', 'release':'8', 'rpm_spec_vers_cmp':TRUE}
    ]
  }
];

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;
foreach var constraint_array ( constraints ) {
  var repo_relative_urls = NULL;
  if (!empty_or_null(constraint_array['repo_relative_urls'])) repo_relative_urls = constraint_array['repo_relative_urls'];
  foreach var pkg ( constraint_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;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['release'])) _release = 'RHEL' + pkg['release'];
    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 (reference &&
        _release &&
        rhel_decide_repo_relative_url_check(required_repo_url_list:repo_relative_urls) &&
        (applicable_repo_urls || (!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, Extended Update Support, Telco Extended Update Support or Update Services for SAP Solutions repositories.\n' +
    'Access to these repositories requires a paid RHEL subscription.\n';
  var extra = NULL;
  if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = subscription_caveat + rpm_report_get() + redhat_report_repo_caveat();
  else extra = subscription_caveat + 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, 'gnutls / gnutls-c++ / gnutls-dane / gnutls-devel / gnutls-utils');
}