Ubuntu 14.04 LTS : Linux kernel (Xenial HWE) vulnerabilities (USN-3005-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3005-1. 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(91567);
  script_version("2.15");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  script_cve_id(
    "CVE-2015-8839",
    "CVE-2016-1583",
    "CVE-2016-2117",
    "CVE-2016-2187",
    "CVE-2016-3961",
    "CVE-2016-4485",
    "CVE-2016-4486",
    "CVE-2016-4558",
    "CVE-2016-4565",
    "CVE-2016-4581"
  );
  script_xref(name:"USN", value:"3005-1");

  script_name(english:"Ubuntu 14.04 LTS : Linux kernel (Xenial HWE) vulnerabilities (USN-3005-1)");

  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-3005-1 advisory.

    Justin Yackoski discovered that the Atheros L2 Ethernet Driver in the Linux kernel incorrectly enables
    scatter/gather I/O. A remote attacker could use this to obtain potentially sensitive information from
    kernel memory. (CVE-2016-2117)

    Jann Horn discovered that eCryptfs improperly attempted to use the mmap() handler of a lower filesystem
    that did not implement one, causing a recursive page fault to occur. A local unprivileged attacker could
    use to cause a denial of service (system crash) or possibly execute arbitrary code with administrative
    privileges. (CVE-2016-1583)

    Multiple race conditions where discovered in the Linux kernel's ext4 file system. A local user could
    exploit this flaw to cause a denial of service (disk corruption) by writing to a page that is associated
    with a different users file after unsynchronized hole punching and page-fault handling. (CVE-2015-8839)

    Ralf Spenneberg discovered that the Linux kernel's GTCO digitizer USB device driver did not properly
    validate endpoint descriptors. An attacker with physical access could use this to cause a denial of
    service (system crash). (CVE-2016-2187)

    Vitaly Kuznetsov discovered that the Linux kernel did not properly suppress hugetlbfs support in X86
    paravirtualized guests. An attacker in the guest OS could cause a denial of service (guest system crash).
    (CVE-2016-3961)

    Kangjie Lu discovered an information leak in the ANSI/IEEE 802.2 LLC type 2 Support implementations in the
    Linux kernel. A local attacker could use this to obtain potentially sensitive information from kernel
    memory. (CVE-2016-4485)

    Kangjie Lu discovered an information leak in the routing netlink socket interface (rtnetlink)
    implementation in the Linux kernel. A local attacker could use this to obtain potentially sensitive
    information from kernel memory. (CVE-2016-4486)

    Jann Horn discovered that the extended Berkeley Packet Filter (eBPF) implementation in the Linux kernel
    could overflow reference counters on systems with more than 32GB of physical ram and with RLIMIT_MEMLOCK
    set to infinite. A local unprivileged attacker could use to create a use-after- free situation, causing a
    denial of service (system crash) or possibly gain administrative privileges. (CVE-2016-4558)

    Jann Horn discovered that the InfiniBand interfaces within the Linux kernel could be coerced into
    overwriting kernel memory. A local unprivileged attacker could use this to possibly gain administrative
    privileges on systems where InifiniBand related kernel modules are loaded. (CVE-2016-4565)

    It was discovered that in some situations the Linux kernel did not handle propagated mounts correctly. A
    local unprivileged attacker could use this to cause a denial of service (system crash). (CVE-2016-4581)

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-3005-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C: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-2016-4565");

  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:"2016/04/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/06/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/06/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-24-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-24-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-24-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-24-powerpc-e500mc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-24-powerpc-smp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-24-powerpc64-emb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-24-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) 2016-2024 Canonical, Inc. / NASL script (C) 2016-2024 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': {
    '4.4.0': {
      'generic': '4.4.0-24',
      'generic-lpae': '4.4.0-24',
      'lowlatency': '4.4.0-24',
      'powerpc-e500mc': '4.4.0-24',
      'powerpc-smp': '4.4.0-24',
      'powerpc64-emb': '4.4.0-24',
      'powerpc64-smp': '4.4.0-24'
    }
  }
};

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-3005-1');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2015-8839', 'CVE-2016-1583', 'CVE-2016-2117', 'CVE-2016-2187', 'CVE-2016-3961', 'CVE-2016-4485', 'CVE-2016-4486', 'CVE-2016-4558', 'CVE-2016-4565', 'CVE-2016-4581');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-3005-1');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}