Ubuntu 16.04 LTS : Linux kernel vulnerabilities (USN-4286-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-4286-1. 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(133799);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  script_cve_id(
    "CVE-2019-14615",
    "CVE-2019-15217",
    "CVE-2019-15220",
    "CVE-2019-15221",
    "CVE-2019-17351",
    "CVE-2019-19051",
    "CVE-2019-19056",
    "CVE-2019-19066",
    "CVE-2019-19068",
    "CVE-2019-19965",
    "CVE-2019-20096",
    "CVE-2019-5108"
  );
  script_xref(name:"USN", value:"4286-1");

  script_name(english:"Ubuntu 16.04 LTS : Linux kernel vulnerabilities (USN-4286-1)");

  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 16.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in
the USN-4286-1 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 a race condition existed in the Softmac USB Prism54 device driver in the Linux
    kernel. A physically proximate attacker could use this to cause a denial of service (system crash).
    (CVE-2019-15220)

    Julien Grall discovered that the Xen balloon memory driver in the Linux kernel did not properly restrict
    the amount of memory set aside for page mappings in some situations. An attacker could use this to cause a
    denial of service (kernel memory exhaustion). (CVE-2019-17351)

    It was discovered that the Intel WiMAX 2400 driver in the Linux kernel did not properly deallocate memory
    in certain situations. A local attacker could use this to cause a denial of service (kernel memory
    exhaustion). (CVE-2019-19051)

    It was discovered that the Marvell Wi-Fi device driver in the Linux kernel did not properly deallocate
    memory in certain error conditions. A local attacker could use this to possibly cause a denial of service
    (kernel memory exhaustion). (CVE-2019-19056)

    It was discovered that the Brocade BFA Fibre Channel 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-2019-19066)

    It was discovered that the Realtek RTL8xxx USB Wi-Fi 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-2019-19068)

    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 ZR364XX Camera USB device driver for the Linux kernel did not properly initialize
    memory. A physically proximate attacker could use this to cause a denial of service (system crash).
    (CVE-2019-15217)

    It was discovered that the Line 6 POD USB device driver in the Linux kernel did not properly validate data
    size information from the device. A physically proximate attacker could use this to cause a denial of
    service (system crash). (CVE-2019-15221)

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-4286-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:P/I:N/A:N");
  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:N/UI:R/S:U/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-14615");

  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:"2019/08/19");
  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-4.4.0-1066-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1102-aws");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1129-raspi2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1133-snapdragon");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-174-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-174-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-174-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-174-powerpc-e500mc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-174-powerpc-smp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-174-powerpc64-emb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-174-powerpc64-smp");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-: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 (! ('16.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04', '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 = {
  '16.04': {
    '4.4.0': {
      'generic': '4.4.0-174',
      'generic-lpae': '4.4.0-174',
      'lowlatency': '4.4.0-174',
      'powerpc-e500mc': '4.4.0-174',
      'powerpc-smp': '4.4.0-174',
      'powerpc64-emb': '4.4.0-174',
      'powerpc64-smp': '4.4.0-174',
      'kvm': '4.4.0-1066',
      'aws': '4.4.0-1102',
      'raspi2': '4.4.0-1129',
      'snapdragon': '4.4.0-1133'
    }
  }
};

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-4286-1');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2019-5108', 'CVE-2019-14615', 'CVE-2019-15217', 'CVE-2019-15220', 'CVE-2019-15221', 'CVE-2019-17351', 'CVE-2019-19051', 'CVE-2019-19056', 'CVE-2019-19066', 'CVE-2019-19068', 'CVE-2019-19965', 'CVE-2019-20096');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-4286-1');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_NOTE,
    extra      : extra
  );
  exit(0);
}