RHEL 8 : kernel (RHSA-2020:3041)

##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2020:3041. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(138798);
  script_version("1.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/06/03");

  script_cve_id(
    "CVE-2020-10757",
    "CVE-2020-10766",
    "CVE-2020-10767",
    "CVE-2020-10768",
    "CVE-2020-12653",
    "CVE-2020-12654",
    "CVE-2020-12888"
  );
  script_xref(name:"RHSA", value:"2020:3041");

  script_name(english:"RHEL 8 : kernel (RHSA-2020:3041)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for kernel.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2020:3041 advisory.

    The kernel packages contain the Linux kernel, the core of any Linux operating system.

    Security Fix(es):

    * kernel: kernel: DAX hugepages not considered during mremap (CVE-2020-10757)

    * kernel: Rogue cross-process SSBD shutdown. Linux scheduler logical bug allows an attacker to turn off
    the SSBD protection. (CVE-2020-10766)

    * kernel: Indirect Branch Prediction Barrier is force-disabled when STIBP is unavailable or enhanced IBRS
    is available. (CVE-2020-10767)

    * kernel: Indirect branch speculation can be enabled after it was force-disabled by the
    PR_SPEC_FORCE_DISABLE prctl command. (CVE-2020-10768)

    * kernel: buffer overflow in mwifiex_cmd_append_vsie_tlv function in
    drivers/net/wireless/marvell/mwifiex/scan.c (CVE-2020-12653)

    * kernel: heap-based buffer overflow in mwifiex_ret_wmm_get_status function in
    drivers/net/wireless/marvell/mwifiex/wmm.c (CVE-2020-12654)

    * Kernel: vfio: access to disabled MMIO space of some devices may lead to DoS scenario (CVE-2020-12888)

    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.

    Bug Fix(es):

    * [ESXi][RHEL8.1.0] scsi driver SG list incompatibility (vmw_pvscsi) (BZ#1839359)

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://access.redhat.com/security/data/csaf/v2/advisories/2020/rhsa-2020_3041.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?50917a0c");
  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-2020:3041");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1831868");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1832530");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1836244");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1842525");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1845840");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1845867");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1845868");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL kernel package based on the guidance in RHSA-2020:3041.");
  script_set_cvss_base_vector("CVSS2#AV:L/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:L/AC:L/PR:L/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-2020-10757");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2020-12653");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(119, 120, 122, 248, 440);
  script_set_attribute(attribute:"vendor_severity", value:"Important");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/04/04");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/07/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/07/21");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_e4s:8.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:bpftool");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-cross-headers");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-debug");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-debug-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-debug-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-debug-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-debug-modules-extra");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-headers");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-modules-extra");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-tools-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:perf");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:python3-perf");
  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: 'eq', os_version: os_ver, rhel_version: '8.0')) audit(AUDIT_OS_NOT, 'Red Hat 8.0', '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-2020-10757', 'CVE-2020-10766', 'CVE-2020-10767', 'CVE-2020-10768', 'CVE-2020-12653', 'CVE-2020-12654', 'CVE-2020-12888');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for RHSA-2020:3041');
  }
  else
  {
    __rpm_report = ksplice_reporting_text();
  }
}

var constraints = [
  {
    'repo_relative_urls': [
      'content/e4s/rhel8/8.0/ppc64le/baseos/debug',
      'content/e4s/rhel8/8.0/ppc64le/baseos/os',
      'content/e4s/rhel8/8.0/ppc64le/baseos/source/SRPMS',
      'content/e4s/rhel8/8.0/x86_64/baseos/debug',
      'content/e4s/rhel8/8.0/x86_64/baseos/os',
      'content/e4s/rhel8/8.0/x86_64/baseos/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'bpftool-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'ppc64le', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'bpftool-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'ppc64le', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-core-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'ppc64le', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-core-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-cross-headers-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'ppc64le', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-cross-headers-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-debug-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'ppc64le', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-debug-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-debug-core-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'ppc64le', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-debug-core-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-debug-devel-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'ppc64le', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-debug-devel-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-debug-modules-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'ppc64le', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-debug-modules-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-debug-modules-extra-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'ppc64le', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-debug-modules-extra-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-devel-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'ppc64le', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-devel-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-headers-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'ppc64le', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-headers-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-modules-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'ppc64le', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-modules-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-modules-extra-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'ppc64le', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-modules-extra-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-tools-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'ppc64le', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-tools-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-tools-libs-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'ppc64le', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-tools-libs-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'perf-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'ppc64le', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'perf-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python3-perf-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'ppc64le', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python3-perf-4.18.0-80.27.1.el8_0', 'sp':'0', 'cpu':'x86_64', '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;
    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 subscription_caveat = '\n' +
    'NOTE: This vulnerability check contains fixes that apply to\n' +
    'packages only available in the Red Hat Enterprise Linux\n' +
    'Update Services for SAP Solutions repository.\n' +
    'Access to this repository 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_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, 'bpftool / kernel / kernel-core / kernel-cross-headers / etc');
}