Ubuntu 16.04 LTS : Linux kernel vulnerabilities (USN-3016-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3016-1. 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(91873);
  script_version("2.16");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  script_cve_id(
    "CVE-2016-4482",
    "CVE-2016-4569",
    "CVE-2016-4578",
    "CVE-2016-4580",
    "CVE-2016-4913",
    "CVE-2016-4951",
    "CVE-2016-4997",
    "CVE-2016-4998"
  );
  script_xref(name:"USN", value:"3016-1");

  script_name(english:"Ubuntu 16.04 LTS : Linux kernel vulnerabilities (USN-3016-1)");

  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-3016-1 advisory.

    Jesse Hertz and Tim Newsham discovered that the Linux netfilter implementation did not correctly perform
    validation when handling 32 bit compatibility IPT_SO_SET_REPLACE events on 64 bit platforms. A local
    unprivileged attacker could use this to cause a denial of service (system crash) or execute arbitrary code
    with administrative privileges. (CVE-2016-4997)

    Kangjie Lu discovered an information leak in the core USB implementation in the Linux kernel. A local
    attacker could use this to obtain potentially sensitive information from kernel memory. (CVE-2016-4482)

    Kangjie Lu discovered an information leak in the timer handling implementation in the Advanced Linux Sound
    Architecture (ALSA) subsystem of the Linux kernel. A local attacker could use this to obtain potentially
    sensitive information from kernel memory. (CVE-2016-4569, CVE-2016-4578)

    Kangjie Lu discovered an information leak in the X.25 Call Request handling in the Linux kernel. A local
    attacker could use this to obtain potentially sensitive information from kernel memory. (CVE-2016-4580)

    It was discovered that an information leak exists in the Rock Ridge implementation in the Linux kernel. A
    local attacker who is able to mount a malicious iso9660 file system image could exploit this flaw to
    obtain potentially sensitive information from kernel memory. (CVE-2016-4913)

    Baozeng Ding discovered that the Transparent Inter-process Communication (TIPC) implementation in the
    Linux kernel did not verify socket existence before use in some situations. A local attacker could use
    this to cause a denial of service (system crash). (CVE-2016-4951)

    Jesse Hertz and Tim Newsham discovered that the Linux netfilter implementation did not correctly perform
    validation when handling IPT_SO_SET_REPLACE events. A local unprivileged attacker could use this to cause
    a denial of service (system crash) or obtain potentially sensitive information from kernel memory.
    (CVE-2016-4998)

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-3016-1");
  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:H/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:H/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2016-4997");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploited_by_malware", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Linux Kernel 4.6.3 Netfilter Privilege Escalation');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/05/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/06/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/06/28");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-28-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-28-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-28-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-28-powerpc-e500mc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-28-powerpc-smp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-28-powerpc64-emb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-28-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) 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 (! ('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': '4.4.0-28',
      'generic-lpae': '4.4.0-28',
      'lowlatency': '4.4.0-28',
      'powerpc-e500mc': '4.4.0-28',
      'powerpc-smp': '4.4.0-28',
      'powerpc64-emb': '4.4.0-28',
      'powerpc64-smp': '4.4.0-28'
    }
  }
};

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-3016-1');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2016-4482', 'CVE-2016-4569', 'CVE-2016-4578', 'CVE-2016-4580', 'CVE-2016-4913', 'CVE-2016-4951', 'CVE-2016-4997', 'CVE-2016-4998');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-3016-1');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}