Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS : Samba vulnerabilities (USN-3827-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3827-1. 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(119254);
  script_version("1.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  script_cve_id("CVE-2018-14629", "CVE-2018-16841", "CVE-2018-16851");
  script_xref(name:"USN", value:"3827-1");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS : Samba vulnerabilities (USN-3827-1)");

  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 / 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-3827-1 advisory.

    Florian Stuelpner discovered that Samba incorrectly handled CNAME records. A remote attacker could use
    this issue to cause Samba to crash, resulting in a denial of service. (CVE-2018-14629)

    Alex MacCuish discovered that Samba incorrectly handled memory when configured to accept smart-card
    authentication. A remote attacker could possibly use this issue to cause Samba to crash, resulting in a
    denial of service. (CVE-2018-16841)

    Garming Sam discovered that Samba incorrectly handled memory when processing LDAP searches. A remote
    attacker could possibly use this issue to cause Samba to crash, resulting in a denial of service.
    (CVE-2018-16851)

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-3827-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/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-2018-16851");

  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:"2018/11/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/11/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/11/28");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba-common-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba-dsdb-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba-testsuite");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba-vfs-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:smbclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:winbind");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ctdb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnss-winbind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpam-smbpass");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpam-winbind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libparse-pidl-perl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libsmbclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libsmbclient-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libsmbsharemodes-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libsmbsharemodes0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libwbclient-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libwbclient0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python-samba");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:registry-tools");
  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");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.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 || '16.04' >< os_release || '18.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04 / 16.04 / 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 pkgs = [
    {'osver': '14.04', 'pkgname': 'libnss-winbind', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.14.04.19'},
    {'osver': '14.04', 'pkgname': 'libpam-smbpass', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.14.04.19'},
    {'osver': '14.04', 'pkgname': 'libpam-winbind', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.14.04.19'},
    {'osver': '14.04', 'pkgname': 'libparse-pidl-perl', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.14.04.19'},
    {'osver': '14.04', 'pkgname': 'libsmbclient', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.14.04.19'},
    {'osver': '14.04', 'pkgname': 'libsmbclient-dev', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.14.04.19'},
    {'osver': '14.04', 'pkgname': 'libsmbsharemodes-dev', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.14.04.19'},
    {'osver': '14.04', 'pkgname': 'libsmbsharemodes0', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.14.04.19'},
    {'osver': '14.04', 'pkgname': 'libwbclient-dev', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.14.04.19'},
    {'osver': '14.04', 'pkgname': 'libwbclient0', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.14.04.19'},
    {'osver': '14.04', 'pkgname': 'python-samba', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.14.04.19'},
    {'osver': '14.04', 'pkgname': 'registry-tools', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.14.04.19'},
    {'osver': '14.04', 'pkgname': 'samba', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.14.04.19'},
    {'osver': '14.04', 'pkgname': 'samba-common', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.14.04.19'},
    {'osver': '14.04', 'pkgname': 'samba-common-bin', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.14.04.19'},
    {'osver': '14.04', 'pkgname': 'samba-dev', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.14.04.19'},
    {'osver': '14.04', 'pkgname': 'samba-dsdb-modules', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.14.04.19'},
    {'osver': '14.04', 'pkgname': 'samba-libs', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.14.04.19'},
    {'osver': '14.04', 'pkgname': 'samba-testsuite', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.14.04.19'},
    {'osver': '14.04', 'pkgname': 'samba-vfs-modules', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.14.04.19'},
    {'osver': '14.04', 'pkgname': 'smbclient', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.14.04.19'},
    {'osver': '14.04', 'pkgname': 'winbind', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.14.04.19'},
    {'osver': '16.04', 'pkgname': 'ctdb', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.16.04.18'},
    {'osver': '16.04', 'pkgname': 'libnss-winbind', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.16.04.18'},
    {'osver': '16.04', 'pkgname': 'libpam-winbind', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.16.04.18'},
    {'osver': '16.04', 'pkgname': 'libparse-pidl-perl', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.16.04.18'},
    {'osver': '16.04', 'pkgname': 'libsmbclient', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.16.04.18'},
    {'osver': '16.04', 'pkgname': 'libsmbclient-dev', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.16.04.18'},
    {'osver': '16.04', 'pkgname': 'libwbclient-dev', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.16.04.18'},
    {'osver': '16.04', 'pkgname': 'libwbclient0', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.16.04.18'},
    {'osver': '16.04', 'pkgname': 'python-samba', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.16.04.18'},
    {'osver': '16.04', 'pkgname': 'registry-tools', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.16.04.18'},
    {'osver': '16.04', 'pkgname': 'samba', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.16.04.18'},
    {'osver': '16.04', 'pkgname': 'samba-common', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.16.04.18'},
    {'osver': '16.04', 'pkgname': 'samba-common-bin', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.16.04.18'},
    {'osver': '16.04', 'pkgname': 'samba-dev', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.16.04.18'},
    {'osver': '16.04', 'pkgname': 'samba-dsdb-modules', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.16.04.18'},
    {'osver': '16.04', 'pkgname': 'samba-libs', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.16.04.18'},
    {'osver': '16.04', 'pkgname': 'samba-testsuite', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.16.04.18'},
    {'osver': '16.04', 'pkgname': 'samba-vfs-modules', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.16.04.18'},
    {'osver': '16.04', 'pkgname': 'smbclient', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.16.04.18'},
    {'osver': '16.04', 'pkgname': 'winbind', 'pkgver': '2:4.3.11+dfsg-0ubuntu0.16.04.18'},
    {'osver': '18.04', 'pkgname': 'ctdb', 'pkgver': '2:4.7.6+dfsg~ubuntu-0ubuntu2.5'},
    {'osver': '18.04', 'pkgname': 'libnss-winbind', 'pkgver': '2:4.7.6+dfsg~ubuntu-0ubuntu2.5'},
    {'osver': '18.04', 'pkgname': 'libpam-winbind', 'pkgver': '2:4.7.6+dfsg~ubuntu-0ubuntu2.5'},
    {'osver': '18.04', 'pkgname': 'libparse-pidl-perl', 'pkgver': '2:4.7.6+dfsg~ubuntu-0ubuntu2.5'},
    {'osver': '18.04', 'pkgname': 'libsmbclient', 'pkgver': '2:4.7.6+dfsg~ubuntu-0ubuntu2.5'},
    {'osver': '18.04', 'pkgname': 'libsmbclient-dev', 'pkgver': '2:4.7.6+dfsg~ubuntu-0ubuntu2.5'},
    {'osver': '18.04', 'pkgname': 'libwbclient-dev', 'pkgver': '2:4.7.6+dfsg~ubuntu-0ubuntu2.5'},
    {'osver': '18.04', 'pkgname': 'libwbclient0', 'pkgver': '2:4.7.6+dfsg~ubuntu-0ubuntu2.5'},
    {'osver': '18.04', 'pkgname': 'python-samba', 'pkgver': '2:4.7.6+dfsg~ubuntu-0ubuntu2.5'},
    {'osver': '18.04', 'pkgname': 'registry-tools', 'pkgver': '2:4.7.6+dfsg~ubuntu-0ubuntu2.5'},
    {'osver': '18.04', 'pkgname': 'samba', 'pkgver': '2:4.7.6+dfsg~ubuntu-0ubuntu2.5'},
    {'osver': '18.04', 'pkgname': 'samba-common', 'pkgver': '2:4.7.6+dfsg~ubuntu-0ubuntu2.5'},
    {'osver': '18.04', 'pkgname': 'samba-common-bin', 'pkgver': '2:4.7.6+dfsg~ubuntu-0ubuntu2.5'},
    {'osver': '18.04', 'pkgname': 'samba-dev', 'pkgver': '2:4.7.6+dfsg~ubuntu-0ubuntu2.5'},
    {'osver': '18.04', 'pkgname': 'samba-dsdb-modules', 'pkgver': '2:4.7.6+dfsg~ubuntu-0ubuntu2.5'},
    {'osver': '18.04', 'pkgname': 'samba-libs', 'pkgver': '2:4.7.6+dfsg~ubuntu-0ubuntu2.5'},
    {'osver': '18.04', 'pkgname': 'samba-testsuite', 'pkgver': '2:4.7.6+dfsg~ubuntu-0ubuntu2.5'},
    {'osver': '18.04', 'pkgname': 'samba-vfs-modules', 'pkgver': '2:4.7.6+dfsg~ubuntu-0ubuntu2.5'},
    {'osver': '18.04', 'pkgname': 'smbclient', 'pkgver': '2:4.7.6+dfsg~ubuntu-0ubuntu2.5'},
    {'osver': '18.04', 'pkgname': 'winbind', 'pkgver': '2:4.7.6+dfsg~ubuntu-0ubuntu2.5'}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) flag++;
  }
}

if (flag)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'ctdb / libnss-winbind / libpam-smbpass / libpam-winbind / etc');
}