Ubuntu 14.04 LTS : Linux kernel vulnerabilities (USN-3798-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3798-1. 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(118329);
  script_version("1.11");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  script_cve_id(
    "CVE-2015-8539",
    "CVE-2016-7913",
    "CVE-2017-0794",
    "CVE-2017-15299",
    "CVE-2017-18216",
    "CVE-2018-1000004",
    "CVE-2018-7566",
    "CVE-2018-9518"
  );
  script_xref(name:"USN", value:"3798-1");

  script_name(english:"Ubuntu 14.04 LTS : Linux kernel vulnerabilities (USN-3798-1)");

  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 14.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in
the USN-3798-1 advisory.

    Dmitry Vyukov discovered that the key management subsystem in the Linux kernel did not properly restrict
    adding a key that already exists but is negatively instantiated. A local attacker could use this to cause
    a denial of service (system crash) or possibly execute arbitrary code. (CVE-2015-8539)

    It was discovered that a use-after-free vulnerability existed in the device driver for XCeive
    xc2028/xc3028 tuners in the Linux kernel. A local attacker could use this to cause a denial of service
    (system crash) or possibly execute arbitrary code. (CVE-2016-7913)

    Pengfei Ding (), Chenfu Bao (), and Lenx Wei () discovered a race condition in the
    generic SCSI driver (sg) of the Linux kernel. A local attacker could use this to cause a denial of service
    (system crash) or possibly execute arbitrary code. (CVE-2017-0794)

    Eric Biggers discovered that the key management subsystem in the Linux kernel did not properly restrict
    adding a key that already exists but is uninstantiated. A local attacker could use this to cause a denial
    of service (system crash) or possibly execute arbitrary code. (CVE-2017-15299)

    It was discovered that a NULL pointer dereference could be triggered in the OCFS2 file system
    implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system
    crash). (CVE-2017-18216)

    Luo Quan and Wei Yang discovered that a race condition existed in the Advanced Linux Sound Architecture
    (ALSA) subsystem of the Linux kernel when handling ioctl()s. A local attacker could use this to cause a
    denial of service (system deadlock). (CVE-2018-1000004)

     discovered that a race condition existed in the Advanced Linux Sound Architecture (ALSA)
    subsystem of the Linux kernel that could lead to a use- after-free or an out-of-bounds buffer access. A
    local attacker with access to /dev/snd/seq could use this to cause a denial of service (system crash) or
    possibly execute arbitrary code. (CVE-2018-7566)

    It was discovered that a buffer overflow existed in the NFC Logical Link Control Protocol (llcp)
    implementation in the Linux kernel. An attacker could use this to cause a denial of service (system crash)
    or possibly execute arbitrary code. (CVE-2018-9518)

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-3798-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:N/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-2016-7913");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2018-9518");

  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:"2016/02/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/10/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/10/23");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-161-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-161-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-161-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-161-powerpc-e500");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-161-powerpc-e500mc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-161-powerpc-smp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-161-powerpc64-emb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-161-powerpc64-smp");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-: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 (! ('14.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04', '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 = {
  '14.04': {
    '3.13.0': {
      'generic': '3.13.0-161',
      'generic-lpae': '3.13.0-161',
      'lowlatency': '3.13.0-161',
      'powerpc-e500': '3.13.0-161',
      'powerpc-e500mc': '3.13.0-161',
      'powerpc-smp': '3.13.0-161',
      'powerpc64-emb': '3.13.0-161',
      'powerpc64-smp': '3.13.0-161'
    }
  }
};

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-3798-1');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2015-8539', 'CVE-2016-7913', 'CVE-2017-0794', 'CVE-2017-15299', 'CVE-2017-18216', 'CVE-2018-7566', 'CVE-2018-9518', 'CVE-2018-1000004');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-3798-1');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}