RHEL 7 : kernel-rt (RHSA-2020:4062)

##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2020:4062. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(141026);
  script_version("1.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/11/07");

  script_cve_id(
    "CVE-2017-18551",
    "CVE-2018-20836",
    "CVE-2019-9454",
    "CVE-2019-9458",
    "CVE-2019-15217",
    "CVE-2019-15807",
    "CVE-2019-15917",
    "CVE-2019-16231",
    "CVE-2019-16233",
    "CVE-2019-16994",
    "CVE-2019-17053",
    "CVE-2019-17055",
    "CVE-2019-18808",
    "CVE-2019-19046",
    "CVE-2019-19055",
    "CVE-2019-19058",
    "CVE-2019-19059",
    "CVE-2019-19062",
    "CVE-2019-19063",
    "CVE-2019-19332",
    "CVE-2019-19447",
    "CVE-2019-19523",
    "CVE-2019-19524",
    "CVE-2019-19530",
    "CVE-2019-19534",
    "CVE-2019-19537",
    "CVE-2019-19767",
    "CVE-2019-19807",
    "CVE-2019-20054",
    "CVE-2019-20095",
    "CVE-2019-20636",
    "CVE-2020-1749",
    "CVE-2020-2732",
    "CVE-2020-8647",
    "CVE-2020-8649",
    "CVE-2020-9383",
    "CVE-2020-10690",
    "CVE-2020-10732",
    "CVE-2020-10742",
    "CVE-2020-10751",
    "CVE-2020-10942",
    "CVE-2020-11565",
    "CVE-2020-12770",
    "CVE-2020-12826",
    "CVE-2020-14305"
  );
  script_bugtraq_id(108196);
  script_xref(name:"RHSA", value:"2020:4062");

  script_name(english:"RHEL 7 : kernel-rt (RHSA-2020:4062)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for kernel-rt.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2020:4062 advisory.

    The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with
    extremely high determinism requirements.

    Security Fix(es):

    * kernel: use-after-free in sound/core/timer.c (CVE-2019-19807)

    * kernel: out of bounds write in function i2c_smbus_xfer_emulated in drivers/i2c/i2c-core-smbus.c
    (CVE-2017-18551)

    * kernel: race condition in smp_task_timedout() and smp_task_done() in drivers/scsi/libsas/sas_expander.c
    leads to use-after-free (CVE-2018-20836)

    * kernel: out of bounds write in i2c driver leads to local escalation of privilege (CVE-2019-9454)

    * kernel: use after free due to race condition in the video driver leads to local privilege escalation
    (CVE-2019-9458)

    Space precludes documenting all of the security fixes in this advisory. See the descriptions of the
    remaining security fixes in the related Knowledge Article:

    https://access.redhat.com/articles/5442481

    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.

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.9 Release Notes
    linked from 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.");
  # https://security.access.redhat.com/data/csaf/v2/advisories/2020/rhsa-2020_4062.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?5334e95b");
  # https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.9_release_notes/index
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?dd3afe18");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/articles/5442481");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/updates/classification/#important");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2020:4062");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1427551");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1707796");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1745528");
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  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1759681");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1760100");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1760310");
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  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1779594");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1781679");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1783434");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1783459");
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  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1818818");
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  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1822077");
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  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1824918");
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  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1834845");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1835127");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1839634");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1850716");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL kernel-rt package based on the guidance in RHSA-2020:4062.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/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:H/PR:N/UI:N/S:U/C:H/I:H/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-2018-20836");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2020-14305");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(94, 119, 125, 200, 250, 319, 349, 362, 400, 416, 476, 772, 787, 908);
  script_set_attribute(attribute:"vendor_severity", value:"Important");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/05/07");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/09/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/09/29");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace-kvm");
  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) 2020-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "redhat_repos.nasl", "linux_alt_patch_detect.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');
include('ksplice.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: 'ge', os_version: os_ver, rhel_version: '7')) audit(AUDIT_OS_NOT, 'Red Hat 7.x', '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);

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  rm_kb_item(name:'Host/uptrack-uname-r');
  var cve_list = make_list('CVE-2017-18551', 'CVE-2018-20836', 'CVE-2019-9454', 'CVE-2019-9458', 'CVE-2019-15217', 'CVE-2019-15807', 'CVE-2019-15917', 'CVE-2019-16231', 'CVE-2019-16233', 'CVE-2019-16994', 'CVE-2019-17053', 'CVE-2019-17055', 'CVE-2019-18808', 'CVE-2019-19046', 'CVE-2019-19055', 'CVE-2019-19058', 'CVE-2019-19059', 'CVE-2019-19062', 'CVE-2019-19063', 'CVE-2019-19332', 'CVE-2019-19447', 'CVE-2019-19523', 'CVE-2019-19524', 'CVE-2019-19530', 'CVE-2019-19534', 'CVE-2019-19537', 'CVE-2019-19767', 'CVE-2019-19807', 'CVE-2019-20054', 'CVE-2019-20095', 'CVE-2019-20636', 'CVE-2020-1749', 'CVE-2020-2732', 'CVE-2020-8647', 'CVE-2020-8649', 'CVE-2020-9383', 'CVE-2020-10690', 'CVE-2020-10732', 'CVE-2020-10742', 'CVE-2020-10751', 'CVE-2020-10942', 'CVE-2020-11565', 'CVE-2020-12770', 'CVE-2020-12826', 'CVE-2020-14305');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for RHSA-2020:4062');
  }
  else
  {
    __rpm_report = ksplice_reporting_text();
  }
}

var constraints = [
  {
    'repo_relative_urls': [
      'content/dist/rhel/server/7/7.9/x86_64/nfv/debug',
      'content/dist/rhel/server/7/7.9/x86_64/nfv/os',
      'content/dist/rhel/server/7/7.9/x86_64/nfv/source/SRPMS',
      'content/dist/rhel/server/7/7.9/x86_64/rt/debug',
      'content/dist/rhel/server/7/7.9/x86_64/rt/os',
      'content/dist/rhel/server/7/7.9/x86_64/rt/source/SRPMS',
      'content/dist/rhel/server/7/7Server/x86_64/nfv/debug',
      'content/dist/rhel/server/7/7Server/x86_64/nfv/os',
      'content/dist/rhel/server/7/7Server/x86_64/nfv/source/SRPMS',
      'content/dist/rhel/server/7/7Server/x86_64/rt/debug',
      'content/dist/rhel/server/7/7Server/x86_64/rt/os',
      'content/dist/rhel/server/7/7Server/x86_64/rt/source/SRPMS',
      'content/els/rhel/server/7/7Server/x86_64/rt/debug',
      'content/els/rhel/server/7/7Server/x86_64/rt/os',
      'content/els/rhel/server/7/7Server/x86_64/rt/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'kernel-rt-3.10.0-1160.rt56.1131.el7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-rt-debug-3.10.0-1160.rt56.1131.el7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-rt-debug-devel-3.10.0-1160.rt56.1131.el7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-rt-debug-kvm-3.10.0-1160.rt56.1131.el7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-rt-devel-3.10.0-1160.rt56.1131.el7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-rt-doc-3.10.0-1160.rt56.1131.el7', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-rt-kvm-3.10.0-1160.rt56.1131.el7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-rt-trace-3.10.0-1160.rt56.1131.el7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-rt-trace-devel-3.10.0-1160.rt56.1131.el7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-rt-trace-kvm-3.10.0-1160.rt56.1131.el7', 'cpu':'x86_64', 'release':'7', '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;
    var cves = 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 (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    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, 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, 'kernel-rt / kernel-rt-debug / kernel-rt-debug-devel / etc');
}