OracleVM 3.4 : kernel-uek (OVMSA-2021-0030)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable, Inc.
#
# The package checks in this plugin were
# extracted from OracleVM Security Advisory OVMSA-2021-0030.
##

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

if (description)
{
  script_id(153221);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/12/01");

  script_cve_id(
    "CVE-2019-9456",
    "CVE-2019-9458",
    "CVE-2020-0305",
    "CVE-2020-0429",
    "CVE-2020-27068",
    "CVE-2020-28097",
    "CVE-2021-3609",
    "CVE-2021-34693"
  );

  script_name(english:"OracleVM 3.4 : kernel-uek (OVMSA-2021-0030)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OracleVM host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote OracleVM system is missing necessary patches to address security updates:

  - In the Android kernel in Pixel C USB monitor driver there is a possible OOB write due to a missing bounds
    check. This could lead to local escalation of privilege with System execution privileges needed. User
    interaction is not needed for exploitation. (CVE-2019-9456)

  - In the Android kernel in the video driver there is a use after free due to a race condition. This could
    lead to local escalation of privilege with no additional execution privileges needed. User interaction is
    not needed for exploitation. (CVE-2019-9458)

  - In cdev_get of char_dev.c, there is a possible use-after-free due to a race condition. This could lead to
    local escalation of privilege with System execution privileges needed. User interaction is not needed for
    exploitation.Product: AndroidVersions: Android-10Android ID: A-153467744 (CVE-2020-0305)

  - In l2tp_session_delete and related functions of l2tp_core.c, there is possible memory corruption due to a
    use after free. This could lead to local escalation of privilege with System execution privileges needed.
    User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID:
    A-152735806 (CVE-2020-0429)

  - In the nl80211_policy policy of nl80211.c, there is a possible out of bounds read due to a missing bounds
    check. This could lead to local information disclosure with System execution privileges needed. User
    interaction is not required for exploitation.Product: AndroidVersions: Android kernelAndroid ID:
    A-119770583 (CVE-2020-27068)

  - The vgacon subsystem in the Linux kernel before 5.8.10 mishandles software scrollback. There is a
    vgacon_scrolldelta out-of-bounds read, aka CID-973c096f6a85. (CVE-2020-28097)

  - net/can/bcm.c in the Linux kernel through 5.12.10 allows local users to obtain sensitive information from
    kernel stack memory because parts of a data structure are uninitialized. (CVE-2021-34693)

  - .A flaw was found in the CAN BCM networking protocol in the Linux kernel, where a local attacker can abuse
    a flaw in the CAN subsystem to corrupt memory, crash the system or escalate privileges. This race
    condition in net/can/bcm.c in the Linux kernel allows for local privilege escalation to root.
    (CVE-2021-3609)

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/cve/CVE-2019-9456.html");
  script_set_attribute(attribute:"see_also", value:"https://linux.oracle.com/cve/CVE-2019-9458.html");
  script_set_attribute(attribute:"see_also", value:"https://linux.oracle.com/cve/CVE-2020-0305.html");
  script_set_attribute(attribute:"see_also", value:"https://linux.oracle.com/cve/CVE-2020-0429.html");
  script_set_attribute(attribute:"see_also", value:"https://linux.oracle.com/cve/CVE-2020-27068.html");
  script_set_attribute(attribute:"see_also", value:"https://linux.oracle.com/cve/CVE-2020-28097.html");
  script_set_attribute(attribute:"see_also", value:"https://linux.oracle.com/cve/CVE-2021-34693.html");
  script_set_attribute(attribute:"see_also", value:"https://linux.oracle.com/cve/CVE-2021-3609.html");
  script_set_attribute(attribute:"see_also", value:"https://linux.oracle.com/errata/OVMSA-2021-0030.html");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel-uek / kernel-uek-firmware 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-2020-27068");

  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:"2019/08/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/09/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/09/13");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:vm:kernel-uek");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:vm:kernel-uek-firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:vm_server:3.4");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2021-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "linux_alt_patch_detect.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/OracleVM/release", "Host/OracleVM/rpm-list");

  exit(0);
}
include('ksplice.inc');
include('rpm.inc');

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var release = get_kb_item("Host/OracleVM/release");
if (isnull(release) || "OVS" >!< release) audit(AUDIT_OS_NOT, "OracleVM");
if (! preg(pattern:"^OVS" + "3\.4" + "(\.[0-9]|$)", string:release)) audit(AUDIT_OS_NOT, "OracleVM 3.4", "OracleVM " + release);
if (!get_kb_item("Host/OracleVM/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$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "OracleVM", cpu);
if ("x86_64" >!< cpu) audit(AUDIT_ARCH_NOT, "x86_64", 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 = ['4.1.12-124.54.6.el6uek'];
  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 OVMSA-2021-0030');
    }
  }
  __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 = '4.1';
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-4.1.12-124.54.6.el6uek', 'cpu':'x86_64', 'release':'3.4', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-4.1.12'},
    {'reference':'kernel-uek-firmware-4.1.12-124.54.6.el6uek', 'cpu':'x86_64', 'release':'3.4', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'kernel-uek-firmware-4.1.12'}
];

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 = 'OVS' + 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 && (!exists_check || rpm_exists(release:release, rpm:exists_check))) {
    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-firmware');
}