Oracle Linux 7 : Unbreakable Enterprise kernel (ELSA-2020-5845)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Oracle Linux Security Advisory ELSA-2020-5845.
##

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

if (description)
{
  script_id(140499);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/10/22");

  script_cve_id(
    "CVE-2018-14613",
    "CVE-2018-16884",
    "CVE-2019-3874",
    "CVE-2019-3900",
    "CVE-2019-5108",
    "CVE-2019-10638",
    "CVE-2019-10639",
    "CVE-2019-11487",
    "CVE-2019-14898",
    "CVE-2019-15218",
    "CVE-2019-16746",
    "CVE-2019-17075",
    "CVE-2019-17133",
    "CVE-2019-18885",
    "CVE-2019-19052",
    "CVE-2019-19063",
    "CVE-2019-19066",
    "CVE-2019-19073",
    "CVE-2019-19074",
    "CVE-2019-19078",
    "CVE-2019-19535",
    "CVE-2019-19922",
    "CVE-2019-20812",
    "CVE-2020-10751",
    "CVE-2020-10767",
    "CVE-2020-10769",
    "CVE-2020-10781",
    "CVE-2020-12114",
    "CVE-2020-12771",
    "CVE-2020-14331",
    "CVE-2020-16166",
    "CVE-2020-24394"
  );
  script_bugtraq_id(
    104917,
    106253,
    107488,
    108054,
    108076,
    109092
  );
  script_xref(name:"CEA-ID", value:"CEA-2021-0025");

  script_name(english:"Oracle Linux 7 : Unbreakable Enterprise kernel (ELSA-2020-5845)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Oracle Linux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the
ELSA-2020-5845 advisory.

    - sched/fair: Fix low cpu usage with high throttling by removing expiration of cpu-local slices (Dave
    Chiluk)  [Orabug: 31350999]  {CVE-2019-19922}
    - sched/fair: Fix throttle_list starvation with low CFS quota (Phil Auld)  [Orabug: 31350999]
    {CVE-2019-19922}
    - sched/fair: Fix bandwidth timer clock drift condition (Xunlei Pang)  [Orabug: 31350999]
    {CVE-2019-19922}
    - btrfs: tree-checker: Verify block_group_item (Qu Wenruo)  [Orabug: 31351986]  {CVE-2018-14613}
    - btrfs: tree-check: reduce stack consumption in check_dir_item (David Sterba)  [Orabug: 31351986]
    {CVE-2018-14613}
    - btrfs: tree-checker: use %zu format string for size_t (Arnd Bergmann)  [Orabug: 31351986]
    {CVE-2018-14613}
    - btrfs: tree-checker: Add checker for dir item (Qu Wenruo)  [Orabug: 31351986]  {CVE-2018-14613}
    - btrfs: tree-checker: Fix false panic for sanity test (Qu Wenruo)  [Orabug: 31351986]  {CVE-2018-14613}
    - btrfs: tree-checker: Enhance btrfs_check_node output (Qu Wenruo)  [Orabug: 31351986]  {CVE-2018-14613}
    - btrfs: Move leaf and node validation checker to tree-checker.c (Qu Wenruo)  [Orabug: 31351986]
    {CVE-2018-14613}
    - btrfs: Add checker for EXTENT_CSUM (Qu Wenruo)  [Orabug: 31351986]  {CVE-2018-14613}
    - btrfs: Add sanity check for EXTENT_DATA when reading out leaf (Qu Wenruo)  [Orabug: 31351986]
    {CVE-2018-14613}
    - btrfs: Check if item pointer overlaps with the item itself (Qu Wenruo)  [Orabug: 31351986]
    {CVE-2018-14613}
    - btrfs: Refactor check_leaf function for later expansion (Qu Wenruo)  [Orabug: 31351986]
    {CVE-2018-14613}
    - nfsd: apply umask on fs without ACL support (J. Bruce Fields)  [Orabug: 31779888]  {CVE-2020-24394}
    - sctp: implement memory accounting on tx path (Xin Long)  [Orabug: 31351959]  {CVE-2019-3874}
    - vhost_net: fix possible infinite loop (Jason Wang)  [Orabug: 31351949]  {CVE-2019-3900} {CVE-2019-3900}
    - vhost: introduce vhost_exceeds_weight() (Jason Wang)  [Orabug: 31351949]  {CVE-2019-3900}
    - vhost_net: introduce vhost_exceeds_weight() (Jason Wang)  [Orabug: 31351949]  {CVE-2019-3900}
    - vhost_net: use packet weight for rx handler, too (Paolo Abeni)  [Orabug: 31351949]  {CVE-2019-3900}
    - vhost-net: set packet weight of tx polling to 2 * vq size (haibinzhang()  [Orabug: 31351949]
    {CVE-2019-3900}
    - repair kABI breakage from 'fs: prevent page refcount overflow in pipe_buf_get' (Dan Duval)  [Orabug:
    31351940]  {CVE-2019-11487}
    - fs: prevent page refcount overflow in pipe_buf_get (Matthew Wilcox)  [Orabug: 31351940]
    {CVE-2019-11487}
    - mm: add 'try_get_page()' helper function (Linus Torvalds)  [Orabug: 31351940]  {CVE-2019-11487}
    - mm: prevent get_user_pages() from overflowing page refcount (Linus Torvalds)  [Orabug: 31351940]
    {CVE-2019-11487}
    - mm: make page ref count overflow check tighter and more explicit (Linus Torvalds)  [Orabug: 31351940]
    {CVE-2019-11487}
    - tracing: Fix buffer_ref pipe ops (Jann Horn)  [Orabug: 31351940]  {CVE-2019-11487}

Tenable has extracted the preceding description block directly from the Oracle 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://linux.oracle.com/errata/ELSA-2020-5845.html");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  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: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-2019-17133");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/07/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/09/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/09/11");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-uek");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-uek-debug");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-uek-debug-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-uek-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-uek-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-uek-headers");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-uek-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-uek-tools-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-uek-tools-libs-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:perf");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:python-perf");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Oracle Linux 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("linux_alt_patch_detect.nasl", "ssh_get_info.nasl");
  script_require_keys("Host/OracleLinux", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/local_checks_enabled");

  exit(0);
}


include('ksplice.inc');
include('rpm.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item('Host/OracleLinux')) audit(AUDIT_OS_NOT, 'Oracle Linux');
var os_release = get_kb_item("Host/RedHat/release");
if (isnull(os_release) || !pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux)", string:os_release)) audit(AUDIT_OS_NOT, 'Oracle Linux');
var os_ver = pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux) .*release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Oracle Linux');
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'Oracle Linux 7', 'Oracle Linux ' + 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$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Oracle Linux', cpu);

var machine_uptrack_level = get_one_kb_item('Host/uptrack-uname-r');
if (machine_uptrack_level)
{
  var trimmed_uptrack_level = ereg_replace(string:machine_uptrack_level, pattern:"\.(x86_64|i[3-6]86|aarch64)$", replace:'');
  var fixed_uptrack_levels = ['4.14.35-1902.306.2.el7uek'];
  foreach var fixed_uptrack_level ( fixed_uptrack_levels ) {
    if (rpm_spec_vers_cmp(a:trimmed_uptrack_level, b:fixed_uptrack_level) >= 0)
    {
      audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for ELSA-2020-5845');
    }
  }
  __rpm_report = 'Running KSplice level of ' + trimmed_uptrack_level + ' does not meet the minimum fixed level of ' + join(fixed_uptrack_levels, sep:' / ') + ' for this advisory.\n\n';
}

var kernel_major_minor = get_kb_item('Host/uname/major_minor');
if (empty_or_null(kernel_major_minor)) exit(1, 'Unable to determine kernel major-minor level.');
var expected_kernel_major_minor = '4.14';
if (kernel_major_minor != expected_kernel_major_minor)
  audit(AUDIT_OS_NOT, 'running kernel level ' + expected_kernel_major_minor + ', it is running kernel level ' + kernel_major_minor);

var pkgs = [
    {'reference':'kernel-uek-4.14.35-1902.306.2.el7uek', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-4.14.35'},
    {'reference':'kernel-uek-debug-4.14.35-1902.306.2.el7uek', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-debug-4.14.35'},
    {'reference':'kernel-uek-debug-devel-4.14.35-1902.306.2.el7uek', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-debug-devel-4.14.35'},
    {'reference':'kernel-uek-devel-4.14.35-1902.306.2.el7uek', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-devel-4.14.35'},
    {'reference':'kernel-uek-doc-4.14.35-1902.306.2.el7uek', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-doc-4.14.35'},
    {'reference':'kernel-uek-headers-4.14.35-1902.306.2.el7uek', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-headers-4.14.35'},
    {'reference':'kernel-uek-tools-4.14.35-1902.306.2.el7uek', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-tools-4.14.35'},
    {'reference':'kernel-uek-tools-libs-4.14.35-1902.306.2.el7uek', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-tools-libs-4.14.35'},
    {'reference':'kernel-uek-tools-libs-devel-4.14.35-1902.306.2.el7uek', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-tools-libs-devel-4.14.35'},
    {'reference':'perf-4.14.35-1902.306.2.el7uek', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'perf-4.14.35'},
    {'reference':'python-perf-4.14.35-1902.306.2.el7uek', 'cpu':'aarch64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'python-perf-4.14.35'},
    {'reference':'kernel-uek-4.14.35-1902.306.2.el7uek', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-4.14.35'},
    {'reference':'kernel-uek-debug-4.14.35-1902.306.2.el7uek', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-debug-4.14.35'},
    {'reference':'kernel-uek-debug-devel-4.14.35-1902.306.2.el7uek', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-debug-devel-4.14.35'},
    {'reference':'kernel-uek-devel-4.14.35-1902.306.2.el7uek', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-devel-4.14.35'},
    {'reference':'kernel-uek-doc-4.14.35-1902.306.2.el7uek', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-doc-4.14.35'},
    {'reference':'kernel-uek-headers-4.14.35-1902.306.2.el7uek', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-headers-4.14.35'},
    {'reference':'kernel-uek-tools-4.14.35-1902.306.2.el7uek', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-tools-4.14.35'},
    {'reference':'kernel-uek-tools-libs-4.14.35-1902.306.2.el7uek', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-tools-libs-4.14.35'},
    {'reference':'kernel-uek-tools-libs-devel-4.14.35-1902.306.2.el7uek', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-tools-libs-devel-4.14.35'},
    {'reference':'perf-4.14.35-1902.306.2.el7uek', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'perf-4.14.35'},
    {'reference':'python-perf-4.14.35-1902.306.2.el7uek', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'python-perf-4.14.35'}
];

var flag = 0;
foreach var 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;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) _release = 'EL' + 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) {
    if (exists_check) {
        if (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++;
    } else {
        if (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)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'kernel-uek / kernel-uek-debug / kernel-uek-debug-devel / etc');
}