Ubuntu 14.04 LTS / 16.04 LTS : Samba regression (USN-2950-5)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-2950-5. 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(91333);
  script_version("2.14");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");
  script_xref(name:"USN", value:"2950-5");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS : Samba regression (USN-2950-5)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by a vulnerability as referenced
in the USN-2950-5 advisory.

    USN-2950-1 fixed vulnerabilities in Samba. USN-2950-3 updated Samba to version 4.3.9, which introduced a
    regression when using the ntlm_auth tool. This update fixes the problem.

    Original advisory details:

    Jouni Knuutinen discovered that Samba contained multiple flaws in the

    DCE/RPC implementation. A remote attacker could use this issue to perform

    a denial of service, downgrade secure connections by performing a

    machine-in-the-middle attack, or possibly execute arbitrary code.

    (CVE-2015-5370)

    Stefan Metzmacher discovered that Samba contained multiple flaws in the

    NTLMSSP authentication implementation. A remote attacker could use this

    issue to downgrade connections to plain text by performing a

    machine-in-the-middle attack. (CVE-2016-2110)

    Alberto Solino discovered that a Samba domain controller would establish a

    secure connection to a server with a spoofed computer name. A remote

    attacker could use this issue to obtain sensitive information.

    (CVE-2016-2111)

    Stefan Metzmacher discovered that the Samba LDAP implementation did not

    enforce integrity protection. A remote attacker could use this issue to

    hijack LDAP connections by performing a machine-in-the-middle attack.

    (CVE-2016-2112)

    Stefan Metzmacher discovered that Samba did not validate TLS certificates.

    A remote attacker could use this issue to spoof a Samba server.

    (CVE-2016-2113)

    Stefan Metzmacher discovered that Samba did not enforce SMB signing even if

    configured to. A remote attacker could use this issue to perform a

    machine-in-the-middle attack. (CVE-2016-2114)

    Stefan Metzmacher discovered that Samba did not enable integrity protection

    for IPC traffic. A remote attacker could use this issue to perform a

    machine-in-the-middle attack. (CVE-2016-2115)

    Stefan Metzmacher discovered that Samba incorrectly handled the MS-SAMR and

    MS-LSAD protocols. A remote attacker could use this flaw with a

    machine-in-the-middle attack to impersonate users and obtain sensitive

    information from the Security Account Manager database. This flaw is

    known as Badlock. (CVE-2016-2118)

    Samba has been updated to 4.3.8 in Ubuntu 14.04 LTS and Ubuntu 15.10.

    Ubuntu 12.04 LTS has been updated to 3.6.25 with backported security fixes.

    In addition to security fixes, the updated packages contain bug fixes,

    new features, and possibly incompatible changes. Configuration changes may

    be required in certain environments.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue 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-2950-5");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_attribute(attribute:"risk_factor", value:"Medium");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_set_attribute(attribute:"in_the_news", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/04/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/05/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/05/26");

  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:"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) 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");
  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)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04 / 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 pkgs = [
    {'osver': '14.04', 'pkgname': 'libnss-winbind', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'libpam-smbpass', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'libpam-winbind', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'libparse-pidl-perl', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'libsmbclient', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'libsmbclient-dev', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'libsmbsharemodes-dev', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'libsmbsharemodes0', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'libwbclient-dev', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'libwbclient0', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'python-samba', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'registry-tools', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'samba', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'samba-common', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'samba-common-bin', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'samba-dev', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'samba-dsdb-modules', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'samba-libs', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'samba-testsuite', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'samba-vfs-modules', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'smbclient', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.14.04.3'},
    {'osver': '14.04', 'pkgname': 'winbind', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.14.04.3'},
    {'osver': '16.04', 'pkgname': 'ctdb', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.16.04.2'},
    {'osver': '16.04', 'pkgname': 'libnss-winbind', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.16.04.2'},
    {'osver': '16.04', 'pkgname': 'libpam-winbind', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.16.04.2'},
    {'osver': '16.04', 'pkgname': 'libparse-pidl-perl', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.16.04.2'},
    {'osver': '16.04', 'pkgname': 'libsmbclient', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.16.04.2'},
    {'osver': '16.04', 'pkgname': 'libsmbclient-dev', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.16.04.2'},
    {'osver': '16.04', 'pkgname': 'libwbclient-dev', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.16.04.2'},
    {'osver': '16.04', 'pkgname': 'libwbclient0', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.16.04.2'},
    {'osver': '16.04', 'pkgname': 'python-samba', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.16.04.2'},
    {'osver': '16.04', 'pkgname': 'registry-tools', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.16.04.2'},
    {'osver': '16.04', 'pkgname': 'samba', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.16.04.2'},
    {'osver': '16.04', 'pkgname': 'samba-common', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.16.04.2'},
    {'osver': '16.04', 'pkgname': 'samba-common-bin', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.16.04.2'},
    {'osver': '16.04', 'pkgname': 'samba-dev', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.16.04.2'},
    {'osver': '16.04', 'pkgname': 'samba-dsdb-modules', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.16.04.2'},
    {'osver': '16.04', 'pkgname': 'samba-libs', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.16.04.2'},
    {'osver': '16.04', 'pkgname': 'samba-testsuite', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.16.04.2'},
    {'osver': '16.04', 'pkgname': 'samba-vfs-modules', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.16.04.2'},
    {'osver': '16.04', 'pkgname': 'smbclient', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.16.04.2'},
    {'osver': '16.04', 'pkgname': 'winbind', 'pkgver': '2:4.3.9+dfsg-0ubuntu0.16.04.2'}
];

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');
}