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("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/09");

  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.

  - Insufficient control flow in certain data structures for some Intel(R) Processors with Intel(R) Processor
    Graphics may allow an unauthenticated user to potentially enable information disclosure via local access.
    (CVE-2019-14615)

  - drivers/gpu/drm/amd/amdkfd/kfd_interrupt.c in the Linux kernel 5.2.14 does not check the alloc_workqueue
    return value, leading to a NULL pointer dereference. NOTE: The security community disputes this issues as
    not being serious enough to be deserving a CVE id (CVE-2019-16229)

  - drivers/net/wireless/marvell/libertas/if_sdio.c in the Linux kernel 5.2.14 does not check the
    alloc_workqueue return value, leading to a NULL pointer dereference. (CVE-2019-16232)

  - In the Linux kernel through 5.3.8, f->fmt.sdr.reserved is uninitialized in rcar_drif_g_fmt_sdr_cap in
    drivers/media/platform/rcar_drif.c, which could cause a memory disclosure problem. (CVE-2019-18786)

  - A memory leak in the af9005_identify_state() function in drivers/media/usb/dvb-usb/af9005.c in the Linux
    kernel through 5.3.9 allows attackers to cause a denial of service (memory consumption), aka
    CID-2289adbfa559. (CVE-2019-18809)

  - Two memory leaks in the mwifiex_pcie_init_evt_ring() function in
    drivers/net/wireless/marvell/mwifiex/pcie.c in the Linux kernel through 5.3.11 allow attackers to cause a
    denial of service (memory consumption) by triggering mwifiex_map_pci_memory() failures, aka
    CID-d10dcb615c8e. (CVE-2019-19057)

  - Two memory leaks in the rtl_usb_probe() function in drivers/net/wireless/realtek/rtlwifi/usb.c in the
    Linux kernel through 5.3.11 allow attackers to cause a denial of service (memory consumption), aka
    CID-3f9361695113. (CVE-2019-19063)

  - In the Linux kernel through 5.4.6, there are information leaks of uninitialized memory to a USB device in
    the drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c driver, aka CID-da2311a6385c. (CVE-2019-19947)

  - In the Linux kernel through 5.4.6, there is a NULL pointer dereference in
    drivers/scsi/libsas/sas_discover.c because of mishandling of port disconnection during discovery, related
    to a PHY down race condition, aka CID-f70267f379b5. (CVE-2019-19965)

  - In the Linux kernel before 5.1, there is a memory leak in __feat_register_sp() in net/dccp/feat.c, which
    may cause denial of service, aka CID-1d3ff0950e2b. (CVE-2019-20096)

  - An exploitable denial-of-service vulnerability exists in the Linux kernel prior to mainline 5.3. An
    attacker could exploit this vulnerability by triggering AP to send IAPP location updates for stations
    before the required authentication process has completed. This could lead to different denial-of-service
    scenarios, either by causing CAM table attacks, or by leading to traffic flapping if faking already
    existing clients in other nearby APs of the same wireless infrastructure. An attacker can forge
    Authentication and Association Request packets to trigger this vulnerability. (CVE-2019-5108)

  - In the Linux kernel 4.14 longterm through 4.14.165 and 4.19 longterm through 4.19.96 (and 5.x before 5.2),
    there is a use-after-free (write) in the i915_ppgtt_close function in drivers/gpu/drm/i915/i915_gem_gtt.c,
    aka CID-7dc40713618c. This is related to i915_gem_context_destroy_ioctl in
    drivers/gpu/drm/i915/i915_gem_context.c. (CVE-2020-7053)

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 = 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);
}