Ubuntu 18.04 LTS : Linux kernel vulnerabilities (USN-4285-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-4285-1. The text 
# itself is copyright (C) Canonical, Inc. See 
# <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
# trademark of Canonical, Inc.
#

include('compat.inc');

if (description)
{
  script_id(133798);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  script_cve_id(
    "CVE-2019-14615",
    "CVE-2019-16229",
    "CVE-2019-16232",
    "CVE-2019-18786",
    "CVE-2019-18809",
    "CVE-2019-19057",
    "CVE-2019-19063",
    "CVE-2019-19947",
    "CVE-2019-19965",
    "CVE-2019-20096",
    "CVE-2019-5108",
    "CVE-2020-7053"
  );
  script_xref(name:"USN", value:"4285-1");

  script_name(english:"Ubuntu 18.04 LTS : Linux kernel vulnerabilities (USN-4285-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 18.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in
the USN-4285-1 advisory.

    It was discovered that the Linux kernel did not properly clear data structures on context switches for
    certain Intel graphics processors. A local attacker could use this to expose sensitive information.
    (CVE-2019-14615)

    It was discovered that the HSA Linux kernel driver for AMD GPU devices did not properly check for errors
    in certain situations, leading to a NULL pointer dereference. A local attacker could possibly use this to
    cause a denial of service. (CVE-2019-16229)

    It was discovered that the Marvell 8xxx Libertas WLAN device driver in the Linux kernel did not properly
    check for errors in certain situations, leading to a NULL pointer dereference. A local attacker could
    possibly use this to cause a denial of service. (CVE-2019-16232)

    It was discovered that the Renesas Digital Radio Interface (DRIF) driver in the Linux kernel did not
    properly initialize data. A local attacker could possibly use this to expose sensitive information (kernel
    memory). (CVE-2019-18786).

    It was discovered that the Afatech AF9005 DVB-T USB device driver in the Linux kernel did not properly
    deallocate memory in certain error conditions. A local attacker could possibly use this to cause a denial
    of service (kernel memory exhaustion). (CVE-2019-18809)

    It was discovered that multiple memory leaks existed in the Marvell WiFi-Ex Driver for the Linux kernel. A
    local attacker could possibly use this to cause a denial of service (kernel memory exhaustion).
    (CVE-2019-19057)

    It was discovered that the Realtek rtlwifi USB device driver in the Linux kernel did not properly
    deallocate memory in certain error conditions. A local attacker could possibly use this to cause a denial
    of service (kernel memory exhaustion). (CVE-2019-19063)

    It was discovered that the Kvaser CAN/USB driver in the Linux kernel did not properly initialize memory in
    certain situations. A local attacker could possibly use this to expose sensitive information (kernel
    memory). (CVE-2019-19947)

    Gao Chuan discovered that the SAS Class driver in the Linux kernel contained a race condition that could
    lead to a NULL pointer dereference. A local attacker could possibly use this to cause a denial of service
    (system crash). (CVE-2019-19965)

    It was discovered that the Datagram Congestion Control Protocol (DCCP) implementation in the Linux kernel
    did not properly deallocate memory in certain error conditions. An attacker could possibly use this to
    cause a denial of service (kernel memory exhaustion). (CVE-2019-20096)

    Mitchell Frank discovered that the Wi-Fi implementation in the Linux kernel when used as an access point
    would send IAPP location updates for stations before client authentication had completed. A physically
    proximate attacker could use this to cause a denial of service. (CVE-2019-5108)

    It was discovered that a race condition can lead to a use-after-free while destroying GEM contexts in the
    i915 driver for the Linux kernel. A local attacker could use this to cause a denial of service (system
    crash) or possibly execute arbitrary code. (CVE-2020-7053)

Tenable has extracted the preceding description block directly from the Ubuntu 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://ubuntu.com/security/notices/USN-4285-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/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: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-2020-7053");

  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:"2019/09/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/02/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/02/19");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0.0-1011-oracle");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0.0-1025-aws");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0.0-1030-gke");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0.0-1031-gcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0.0-1032-azure");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"Ubuntu Security Notice (C) 2020-2024 Canonical, Inc. / NASL script (C) 2020-2024 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/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.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/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('18.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 18.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) 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) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

var kernel_mappings = {
  '18.04': {
    '5.0.0': {
      'oracle': '5.0.0-1011',
      'aws': '5.0.0-1025',
      'gke': '5.0.0-1030',
      'gcp': '5.0.0-1031',
      'azure': '5.0.0-1032'
    }
  }
};

var host_kernel_release = get_kb_item('Host/uptrack-uname-r');
if (empty_or_null(host_kernel_release)) host_kernel_release = get_kb_item_or_exit('Host/uname-r');
var host_kernel_base_version = get_kb_item_or_exit('Host/Debian/kernel-base-version');
var host_kernel_type = get_kb_item_or_exit('Host/Debian/kernel-type');
if(empty_or_null(kernel_mappings[os_release][host_kernel_base_version][host_kernel_type])) audit(AUDIT_INST_VER_NOT_VULN, 'kernel ' + host_kernel_release);

var extra = '';
var kernel_fixed_version = kernel_mappings[os_release][host_kernel_base_version][host_kernel_type] + "-" + host_kernel_type;
if (deb_ver_cmp(ver1:host_kernel_release, ver2:kernel_fixed_version) < 0)
{
  extra += 'Running Kernel level of ' + host_kernel_release + ' does not meet the minimum fixed level of ' + kernel_fixed_version + ' for this advisory.\n\n';
}
  else
{
  audit(AUDIT_PATCH_INSTALLED, 'Kernel package for USN-4285-1');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2019-5108', 'CVE-2019-14615', 'CVE-2019-16229', 'CVE-2019-16232', 'CVE-2019-18786', 'CVE-2019-18809', 'CVE-2019-19057', 'CVE-2019-19063', 'CVE-2019-19947', 'CVE-2019-19965', 'CVE-2019-20096', 'CVE-2020-7053');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-4285-1');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : extra
  );
  exit(0);
}