Ubuntu 16.04 LTS : Linux kernel vulnerabilities (USN-3696-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3696-1. 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(110896);
  script_version("1.12");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  script_cve_id(
    "CVE-2017-13695",
    "CVE-2017-18255",
    "CVE-2017-18257",
    "CVE-2018-1000204",
    "CVE-2018-10021",
    "CVE-2018-10087",
    "CVE-2018-10124",
    "CVE-2018-3665",
    "CVE-2018-5814",
    "CVE-2018-7755"
  );
  script_xref(name:"USN", value:"3696-1");

  script_name(english:"Ubuntu 16.04 LTS : Linux kernel vulnerabilities (USN-3696-1)");

  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-3696-1 advisory.

    It was discovered that an integer overflow existed in the perf subsystem of the Linux kernel. A local
    attacker could use this to cause a denial of service (system crash). (CVE-2017-18255)

    Wei Fang discovered an integer overflow in the F2FS filesystem implementation in the Linux kernel. A local
    attacker could use this to cause a denial of service. (CVE-2017-18257)

    It was discovered that an information leak existed in the generic SCSI driver in the Linux kernel. A local
    attacker could use this to expose sensitive information (kernel memory). (CVE-2018-1000204)

    It was discovered that the wait4() system call in the Linux kernel did not properly validate its arguments
    in some situations. A local attacker could possibly use this to cause a denial of service.
    (CVE-2018-10087)

    It was discovered that the kill() system call implementation in the Linux kernel did not properly validate
    its arguments in some situations. A local attacker could possibly use this to cause a denial of service.
    (CVE-2018-10124)

    Julian Stecklina and Thomas Prescher discovered that FPU register states (such as MMX, SSE, and AVX
    registers) which are lazily restored are potentially vulnerable to a side channel attack. A local attacker
    could use this to expose sensitive information. (CVE-2018-3665)

    Jakub Jirasek discovered that multiple use-after-free errors existed in the USB/IP implementation in the
    Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly
    execute arbitrary code. (CVE-2018-5814)

    It was discovered that an information leak vulnerability existed in the floppy driver in the Linux kernel.
    A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-7755)

    Seunghun Han discovered an information leak in the ACPI handling code in the Linux kernel when handling
    early termination of ACPI table loading. A local attacker could use this to expose sensitive informal
    (kernel address locations). (CVE-2017-13695)

    It was discovered that a memory leak existed in the Serial Attached SCSI (SAS) implementation in the Linux
    kernel. A physically proximate attacker could use this to cause a denial of service (memory exhaustion).
    (CVE-2018-10021)

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-3696-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C");
  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-2018-5814");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2017-18255");

  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:"2017/08/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/07/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/07/03");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1029-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1062-aws");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1092-raspi2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1095-snapdragon");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-130-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-130-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-130-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-130-powerpc-e500mc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-130-powerpc-smp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-130-powerpc64-emb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-130-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) 2018-2024 Canonical, Inc. / NASL script (C) 2018-2024 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': '4.4.0-130',
      'generic-lpae': '4.4.0-130',
      'lowlatency': '4.4.0-130',
      'powerpc-e500mc': '4.4.0-130',
      'powerpc-smp': '4.4.0-130',
      'powerpc64-emb': '4.4.0-130',
      'powerpc64-smp': '4.4.0-130',
      'kvm': '4.4.0-1029',
      'aws': '4.4.0-1062',
      'raspi2': '4.4.0-1092',
      'snapdragon': '4.4.0-1095'
    }
  }
};

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-3696-1');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2017-13695', 'CVE-2017-18255', 'CVE-2017-18257', 'CVE-2018-3665', 'CVE-2018-5814', 'CVE-2018-7755', 'CVE-2018-10021', 'CVE-2018-10087', 'CVE-2018-10124', 'CVE-2018-1000204');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-3696-1');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : extra
  );
  exit(0);
}