691 lines
17 KiB
Ruby
691 lines
17 KiB
Ruby
require 'rex/proto/smb'
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require 'rex/proto/dcerpc'
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require 'rex/encoder/ndr'
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module Msf
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###
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#
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# This mixin provides utility methods for interacting with a SMB/CIFS service on
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# a remote machine. These methods may generally be useful in the context of
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# exploitation. This mixin extends the Tcp exploit mixin. Only one SMB
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# service can be accessed at a time using this class.
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#
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###
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module Exploit::Remote::SMB
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include Exploit::Remote::Tcp
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SIMPLE = Rex::Proto::SMB::SimpleClient
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XCEPT = Rex::Proto::SMB::Exceptions
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CONST = Rex::Proto::SMB::Constants
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# Alias over the Rex DCERPC protocol modules
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DCERPCPacket = Rex::Proto::DCERPC::Packet
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DCERPCClient = Rex::Proto::DCERPC::Client
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DCERPCResponse = Rex::Proto::DCERPC::Response
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DCERPCUUID = Rex::Proto::DCERPC::UUID
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NDR = Rex::Encoder::NDR
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def initialize(info = {})
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super
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register_evasion_options(
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[
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OptBool.new('SMB::pipe_evasion', [ true, 'Enable segmented read/writes for SMB Pipes', 'False']),
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OptInt.new('SMB::pipe_write_min_size', [ true, 'Minimum buffer size for pipe writes', 1]),
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OptInt.new('SMB::pipe_write_max_size', [ true, 'Maximum buffer size for pipe writes', 1024]),
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OptInt.new('SMB::pipe_read_min_size', [ true, 'Minimum buffer size for pipe reads', 1]),
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OptInt.new('SMB::pipe_read_max_size', [ true, 'Maximum buffer size for pipe reads', 1024]),
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OptInt.new('SMB::pad_data_level', [ true, 'Place extra padding between headers and data (level 0-3)', 0]),
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OptInt.new('SMB::pad_file_level', [ true, 'Obscure path names used in open/create (level 0-3)', 0]),
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OptInt.new('SMB::obscure_trans_pipe_level', [ true, 'Obscure PIPE string in TransNamedPipe (level 0-3)', 0]),
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], Msf::Exploit::Remote::SMB)
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register_advanced_options(
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[
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OptBool.new('SMBDirect', [ true, 'The target port is a raw SMB service (not NetBIOS)', 'True' ]),
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OptString.new('SMBUser', [ false, 'The username to authenticate as', '']),
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OptString.new('SMBPass', [ false, 'The password for the specified username', '']),
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OptString.new('SMBDomain', [ false, 'The Windows domain to use for authentication', 'WORKGROUP']),
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OptString.new('SMBName', [ true, 'The NetBIOS hostname (required for port 139 connections)', '*SMBSERVER'])
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], Msf::Exploit::Remote::SMB)
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register_options(
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[
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Opt::RHOST,
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OptInt.new('RPORT', [ true, 'Set the SMB service port', 445])
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], Msf::Exploit::Remote::SMB)
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register_autofilter_ports([ 139, 445])
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register_autofilter_services(%W{ netbios-ssn microsoft-ds })
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end
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def connect(global=true)
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disconnect() if global
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s = super(global)
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self.sock = s if global
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# Disable direct SMB when SMBDirect has not been set
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# and the destination port is configured as 139
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direct = smb_direct
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if(datastore.default?('SMBDirect') and rport.to_i == 139)
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direct = false
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end
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c = SIMPLE.new(s, direct)
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# setup pipe evasion foo
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if datastore['SMB::pipe_evasion']
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# XXX - insert code to change the instance of the read/write functions to do segmentation
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end
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if (datastore['SMB::pad_data_level'])
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c.client.evasion_opts['pad_data'] = datastore['SMB::pad_data_level']
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end
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if (datastore['SMB::pad_file_level'])
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c.client.evasion_opts['pad_file'] = datastore['SMB::pad_file_level']
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end
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if (datastore['SMB::obscure_trans_pipe_level'])
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c.client.evasion_opts['obscure_trans_pipe'] = datastore['SMB::obscure_trans_pipe_level']
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end
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self.simple = c if global
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c
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end
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# Convert a standard ASCII string to 16-bit Unicode
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def unicode(str)
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Rex::Text.to_unicode(str)
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end
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# This method establishes a SMB session over the default socket
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def smb_login
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simple.login(
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datastore['SMBName'],
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datastore['SMBUser'],
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datastore['SMBPass'],
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datastore['SMBDomain']
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)
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simple.connect("\\\\#{datastore['RHOST']}\\IPC$")
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end
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# This method returns the native operating system of the peer
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def smb_peer_os
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self.simple.client.peer_native_os
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end
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# This method returns the native lanman version of the peer
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def smb_peer_lm
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self.simple.client.peer_native_lm
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end
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# This method opens a handle to an IPC pipe
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def smb_create(pipe)
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self.simple.create_pipe(pipe)
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end
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def smb_hostname
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datastore['SMBName'] || '*SMBSERVER'
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end
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def smb_direct
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datastore['SMBDirect']
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end
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#
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# Fingerprinting methods
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#
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# This method the EnumPrinters() function of the spooler service
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def smb_enumprinters(flags, name, level, blen)
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stub =
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NDR.long(flags) +
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(name ? NDR.uwstring(name) : NDR.long(0)) +
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NDR.long(level) +
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NDR.long(rand(0xffffffff)+1)+
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NDR.long(blen) +
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"\x00" * blen +
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NDR.long(blen)
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handle = dcerpc_handle(
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'12345678-1234-abcd-ef00-0123456789ab', '1.0',
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'ncacn_np', ["\\SPOOLSS"]
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)
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begin
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dcerpc_bind(handle)
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dcerpc.call(0x00, stub)
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return dcerpc.last_response.stub_data
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rescue ::Interrupt
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raise $!
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rescue ::Exception => e
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return nil
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end
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end
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# This method dumps the print provider strings from the spooler
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def smb_enumprintproviders
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resp = smb_enumprinters(8, nil, 1, 0)
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return nil if not resp
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rptr, tmp, blen = resp.unpack("V*")
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resp = smb_enumprinters(8, nil, 1, blen)
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return nil if not resp
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bcnt,pcnt,stat = resp[-12, 12].unpack("VVV")
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return nil if stat != 0
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return nil if pcnt == 0
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return nil if bcnt > blen
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return nil if pcnt < 3
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#
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# The correct way, which leads to invalid offsets :-(
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#
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#providers = []
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#
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#0.upto(pcnt-1) do |i|
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# flags,desc_o,name_o,comm_o = resp[8 + (i*16), 16].unpack("VVVV")
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#
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# #desc = read_unicode(resp,8+desc_o).gsub("\x00", '')
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# #name = read_unicode(resp,8+name_o).gsub("\x00", '')
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# #comm = read_unicode(resp,8+comm_o).gsub("\x00", '')
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# #providers << [flags,desc,name,comm]
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#end
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#
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#providers
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return resp
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end
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# This method performs an extensive set of fingerprinting operations
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def smb_fingerprint
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fprint = {}
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# Connect to the server if needed
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if(not self.simple)
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connect()
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smb_login()
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end
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os = 'Unknown'
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sp = ''
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case smb_peer_os()
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when 'Windows NT 4.0'
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os = 'Windows NT 4.0'
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when 'Windows 5.0'
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os = 'Windows 2000'
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when 'Windows 5.1'
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os = 'Windows XP'
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when /Windows XP (\d+) Service Pack (\d+)/
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os = 'Windows XP'
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sp = 'Service Pack ' + $2
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when /Windows Server 2003 (\d+)$/
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os = 'Windows 2003'
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sp = 'No Service Pack'
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when /Windows Server 2003 (\d+) Service Pack (\d+)/
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os = 'Windows 2003'
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sp = 'Service Pack ' + $2
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when /Windows Server 2003 R2 (\d+) Service Pack (\d+)/
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os = 'Windows 2003 R2'
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sp = 'Service Pack ' + $2
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when /Windows Vista \(TM\) (\w+|\w+ \w+) (\d+) Service Pack (\d+)/
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os = 'Windows Vista ' + $1
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sp = 'Service Pack ' + $3
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when /Windows Vista \(TM\) (\w+|\w+ \w+) (\d+)/
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os = 'Windows Vista ' + $1
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sp = '(Build ' + $2 + ')'
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when /Windows Server \(R\) 2008 (([\-\w]+ ){1,4})(\d+) Service Pack (\d+)/
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os = 'Windows 2008 ' + $1.strip
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sp = 'Service Pack ' + $4
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when /Windows Server \(R\) 2008 (([\-\w]+ ){1,4})(\d+)/
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os = 'Windows 2008 ' + $1.strip
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sp = '(Build ' + $3 + ')'
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when /Windows \(R\) Storage Server 2008 (([\-\w]+ ){1,4})(\d+) Service Pack (\d+)/
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os = 'Windows 2008 Storage Server ' + $1.strip
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sp = 'Service Pack ' + $4
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when /Windows \(R\) Storage Server 2008 (([\-\w]+ ){1,4})(\d+)/
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os = 'Windows 2008 Storage Server ' + $1.strip
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sp = '(Build ' + $3 + ')'
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when /Windows 7 (([\-\w]+ ){1,4})(\d+)/
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os = 'Windows 7 ' + $1.strip
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sp = '(Build ' + $3 + ')'
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when /^(Windows.*) Service Pack (\d+)/
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os = $1.strip
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sp = 'Service Pack ' + $2
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when /^(Windows.*) (\d+)/
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os = $1.strip
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sp = '(Build ' + $2 + ')'
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when 'Unix'
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os = 'Unix'
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sv = smb_peer_lm()
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case sv
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when /Samba\s+(.*)/i
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sp = 'Samba ' + $1
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end
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end
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if (os == 'Windows XP' and sp.length == 0)
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# SRVSVC was blocked in SP2
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begin
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smb_create("\\SRVSVC")
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sp = 'Service Pack 0 / 1'
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rescue ::Rex::Proto::SMB::Exceptions::ErrorCode => e
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if (e.error_code == 0xc0000022)
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sp = 'Service Pack 2+'
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end
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end
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end
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if (os == 'Windows 2000' and sp.length == 0)
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# LLSRPC was blocked in a post-SP4 update
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begin
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smb_create("\\LLSRPC")
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sp = 'Service Pack 0 - 4'
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rescue ::Rex::Proto::SMB::Exceptions::ErrorCode => e
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if (e.error_code == 0xc0000022)
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sp = 'Service Pack 4 with MS05-010+'
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end
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end
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end
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#
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# Perform granular XP SP checks if LSARPC is exposed
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#
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if (os == 'Windows XP')
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#
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# Service Pack 2 added a range(0,64000) to opnum 0x22 in SRVSVC
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# Credit to spoonm for first use of unbounded [out] buffers
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#
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handle = dcerpc_handle(
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'4b324fc8-1670-01d3-1278-5a47bf6ee188', '3.0',
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'ncacn_np', ["\\BROWSER"]
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)
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begin
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dcerpc_bind(handle)
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stub =
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NDR.uwstring(Rex::Text.rand_text_alpha(rand(10)+1)) +
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NDR.wstring(Rex::Text.rand_text_alpha(rand(10)+1)) +
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NDR.long(64001) +
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NDR.long(0) +
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NDR.long(0)
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dcerpc.call(0x22, stub)
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sp = "Service Pack 0 / 1"
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rescue ::Interrupt
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raise $!
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rescue ::Rex::Proto::SMB::Exceptions::ErrorCode
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rescue ::Rex::Proto::SMB::Exceptions::ReadPacket
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rescue ::Rex::Proto::DCERPC::Exceptions::Fault
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sp = "Service Pack 2+"
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rescue ::Exception
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end
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#
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# Service Pack 3 fixed information leaks via [unique][out] pointers
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# Call SRVSVC::NetRemoteTOD() to return [out] [ref] [unique]
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# Credit:
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# Pointer leak is well known, but Immunity also covered in a paper
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# Silent fix of pointer leak in SP3 and detection method by Rhys Kidd
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#
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handle = dcerpc_handle(
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'4b324fc8-1670-01d3-1278-5a47bf6ee188', '3.0',
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'ncacn_np', ["\\BROWSER"]
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)
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begin
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dcerpc_bind(handle)
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stub = NDR.uwstring(Rex::Text.rand_text_alpha(rand(8)+1))
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resp = dcerpc.call(0x1c, stub)
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if(resp and resp[0,4] == "\x00\x00\x02\x00")
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sp = "Service Pack 3"
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else
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if(resp and sp =~ /Service Pack 2\+/)
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sp = "Service Pack 2"
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end
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end
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rescue ::Interrupt
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raise $!
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rescue ::Rex::Proto::SMB::Exceptions::ErrorCode
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rescue ::Rex::Proto::SMB::Exceptions::ReadPacket
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rescue ::Exception
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end
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end
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#
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# Remote language detection via Print Providers
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# Credit: http://immunityinc.com/downloads/Remote_Language_Detection_in_Immunity_CANVAS.odt
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#
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lang = 'Unknown'
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sigs =
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{
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'English' =>
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[
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Rex::Text.to_unicode('Windows NT Remote Printers'),
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Rex::Text.to_unicode('LanMan Print Services')
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],
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'Spanish' =>
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[
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Rex::Text.to_unicode('Impresoras remotas Windows NT'),
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Rex::Text.to_unicode('Impresoras remotas de Windows NT')
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],
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'Italian' =>
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[
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Rex::Text.to_unicode('Stampanti remote di Windows NT'),
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Rex::Text.to_unicode('Servizi di stampa LanMan')
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],
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'French' =>
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[
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Rex::Text.to_unicode('Imprimantes distantes NT'),
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Rex::Text.to_unicode('Imprimantes distantes pour Windows NT'),
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Rex::Text.to_unicode("Services d'impression LanMan")
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],
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'German' =>
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[
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Rex::Text.to_unicode('Remotedrucker')
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],
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'Portuguese - Brazilian' =>
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[
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Rex::Text.to_unicode('Impr. remotas Windows NT'),
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Rex::Text.to_unicode('Impressoras remotas do Windows NT')
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],
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'Portuguese' =>
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[
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Rex::Text.to_unicode('Imp. remotas do Windows NT')
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],
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'Hungarian' =>
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[
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Rex::Text.to_unicode("\x54\xe1\x76\x6f\x6c\x69\x20\x6e\x79\x6f\x6d\x74\x61\x74\xf3\x6b")
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],
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'Finnish' =>
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[
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Rex::Text.to_unicode("\x45\x74\xe4\x74\x75\x6c\x6f\x73\x74\x69\x6d\x65\x74")
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],
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'Dutch' =>
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[
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Rex::Text.to_unicode('Externe printers voor NT')
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],
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'Danish' =>
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[
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Rex::Text.to_unicode('Fjernprintere')
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],
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'Swedish' =>
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[
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Rex::Text.to_unicode("\x46\x6a\xe4\x72\x72\x73\x6b\x72\x69\x76\x61\x72\x65")
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],
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'Polish' =>
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[
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Rex::Text.to_unicode('Zdalne drukarki')
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],
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'Czech' =>
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[
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Rex::Text.to_unicode("\x56\x7a\x64\xe1\x6c\x65\x6e\xe9\x20\x74\x69\x73\x6b\xe1\x72\x6e\x79")
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],
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'Turkish' =>
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[
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"\x59\x00\x61\x00\x7a\x00\x31\x01\x63\x00\x31\x01\x6c\x00\x61\x00\x72\x00"
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],
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'Japanese' =>
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[
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"\xea\x30\xe2\x30\xfc\x30\xc8\x30\x20\x00\xd7\x30\xea\x30\xf3\x30\xbf\x30"
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],
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'Chinese - Traditional' =>
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[
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"\xdc\x8f\x0b\x7a\x53\x62\x70\x53\x3a\x67"
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],
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'Chinese - Traditional / Taiwan' =>
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[
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"\x60\x90\xef\x7a\x70\x53\x68\x88\x5f\x6a",
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],
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'Korean' =>
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[
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"\xd0\xc6\xa9\xac\x20\x00\x04\xd5\xb0\xb9\x30\xd1",
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],
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'Russian' =>
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[
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"\x1f\x04\x40\x04\x38\x04\x3d\x04\x42\x04\x35\x04\x40\x04\x4b\x04\x20\x00\x43\x04\x34\x04\x30\x04\x3b\x04\x35\x04\x3d\x04\x3d\x04\x3e\x04\x33\x04\x3e\x04\x20\x00\x34\x04\x3e\x04\x41\x04\x42\x04\x43\x04\x3f\x04\x30\x04",
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],
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}
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begin
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prov = smb_enumprintproviders()
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if(prov)
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sigs.each_key do |k|
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sigs[k].each do |s|
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if(prov.index(s))
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lang = k
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break
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end
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break if lang != 'Unknown'
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end
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break if lang != 'Unknown'
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end
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if(lang == 'Unknown')
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@fpcache ||= {}
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mhash = ::Digest::MD5.hexdigest(prov[4,prov.length-4])
|
|
|
|
if(not @fpcache[mhash])
|
|
|
|
buff = "\n"
|
|
buff << "*** NEW FINGERPRINT: PLEASE SEND TO [ msfdev[at]metasploit.com ]\n"
|
|
buff << " VERS: $Revision$\n"
|
|
buff << " HOST: #{rhost}\n"
|
|
buff << " OS: #{os}\n"
|
|
buff << " SP: #{sp}\n"
|
|
|
|
prov.unpack("H*")[0].scan(/.{64}|.*/).each do |line|
|
|
next if line.length == 0
|
|
buff << " FP: #{line}\n"
|
|
end
|
|
|
|
prov.split(/\x00\x00+/).each do |line|
|
|
line.gsub!("\x00",'')
|
|
line.strip!
|
|
next if line.length < 6
|
|
|
|
buff << " TXT: #{line}\n"
|
|
end
|
|
|
|
buff << "*** END FINGERPRINT\n"
|
|
|
|
print_line(buff)
|
|
|
|
@fpcache[mhash] = true
|
|
end
|
|
|
|
end
|
|
end
|
|
rescue ::Interrupt
|
|
raise $!
|
|
rescue ::Rex::Proto::SMB::Exceptions::ErrorCode
|
|
end
|
|
|
|
fprint['os'] = os
|
|
fprint['sp'] = sp
|
|
fprint['lang'] = lang
|
|
|
|
fprint
|
|
end
|
|
|
|
#
|
|
# Accessors
|
|
#
|
|
|
|
attr_accessor :simple
|
|
|
|
end
|
|
|
|
###
|
|
#
|
|
# This mixin provides a minimal SMB server
|
|
#
|
|
###
|
|
|
|
module Exploit::Remote::SMBServer
|
|
include Exploit::Remote::TcpServer
|
|
CONST = ::Rex::Proto::SMB::Constants
|
|
CRYPT = ::Rex::Proto::SMB::Crypt
|
|
UTILS = ::Rex::Proto::SMB::Utils
|
|
XCEPT = ::Rex::Proto::SMB::Exceptions
|
|
EVADE = ::Rex::Proto::SMB::Evasions
|
|
|
|
def initialize(info = {})
|
|
super
|
|
|
|
register_options(
|
|
[
|
|
OptPort.new('SRVPORT', [ true, "The local port to listen on.", 139 ])
|
|
], self.class)
|
|
end
|
|
|
|
def setup
|
|
super
|
|
@state = {}
|
|
end
|
|
|
|
def on_client_connect(client)
|
|
# print_status("New SMB connection from #{client.peerhost}:#{client.peerport}")
|
|
smb_conn(client)
|
|
end
|
|
|
|
def on_client_data(client)
|
|
# print_status("New data from #{client.peerhost}:#{client.peerport}")
|
|
smb_recv(client)
|
|
true
|
|
end
|
|
|
|
def on_client_close(client)
|
|
smb_stop(client)
|
|
end
|
|
|
|
def smb_conn(c)
|
|
@state[c] = {:name => "#{c.peerhost}:#{c.peerport}", :ip => c.peerhost, :port => c.peerport}
|
|
end
|
|
|
|
def smb_stop(c)
|
|
@state.delete(c)
|
|
end
|
|
|
|
def smb_recv(c)
|
|
smb = @state[c]
|
|
smb[:data] ||= ''
|
|
smb[:data] << c.get_once
|
|
|
|
while(smb[:data].length > 0)
|
|
|
|
return if smb[:data].length < 4
|
|
|
|
plen = smb[:data][2,2].unpack('n')[0]
|
|
|
|
return if smb[:data].length < plen+4
|
|
|
|
buff = smb[:data].slice!(0, plen+4)
|
|
|
|
pkt_nbs = CONST::NBRAW_PKT.make_struct
|
|
pkt_nbs.from_s(buff)
|
|
|
|
# print_status("NetBIOS request from #{smb[:name]} #{pkt_nbs.v['Type']} #{pkt_nbs.v['Flags']} #{buff.inspect}")
|
|
|
|
# Check for a NetBIOS name request
|
|
if (pkt_nbs.v['Type'] == 0x81)
|
|
# Accept any name they happen to send
|
|
|
|
host_dst = UTILS.nbname_decode(pkt_nbs.v['Payload'][1,32]).gsub(/[\x00\x20]+$/, '')
|
|
host_src = UTILS.nbname_decode(pkt_nbs.v['Payload'][35,32]).gsub(/[\x00\x20]+$/, '')
|
|
|
|
smb[:nbdst] = host_dst
|
|
smb[:nbsrc] = host_src
|
|
|
|
# print_status("NetBIOS session request from #{smb[:name]} (asking for #{host_dst} from #{host_src})")
|
|
c.write("\x82\x00\x00\x00")
|
|
next
|
|
end
|
|
|
|
|
|
#
|
|
# TODO: Support AndX parameters
|
|
#
|
|
|
|
|
|
# Cast this to a generic SMB structure
|
|
pkt = CONST::SMB_BASE_PKT.make_struct
|
|
pkt.from_s(buff)
|
|
|
|
# Only response to requests, ignore server replies
|
|
if (pkt['Payload']['SMB'].v['Flags1'] & 128 != 0)
|
|
print_status("Ignoring server response from #{smb[:name]}")
|
|
next
|
|
end
|
|
|
|
cmd = pkt['Payload']['SMB'].v['Command']
|
|
begin
|
|
smb_cmd_dispatch(cmd, c, buff)
|
|
rescue ::Interrupt
|
|
raise $!
|
|
rescue ::Exception => e
|
|
print_status("Error processing request from #{smb[:name]} (#{cmd}): #{e.class} #{e} #{e.backtrace}")
|
|
next
|
|
end
|
|
end
|
|
end
|
|
|
|
def smb_cmd_dispatch(cmd, c, buff)
|
|
smb = @state[c]
|
|
print_status("Received command #{cmd} from #{smb[:name]}")
|
|
end
|
|
|
|
def smb_set_defaults(c, pkt)
|
|
smb = @state[c]
|
|
pkt['Payload']['SMB'].v['ProcessID'] = smb[:process_id].to_i
|
|
pkt['Payload']['SMB'].v['UserID'] = smb[:user_id].to_i
|
|
pkt['Payload']['SMB'].v['TreeID'] = smb[:tree_id].to_i
|
|
pkt['Payload']['SMB'].v['MultiplexID'] = smb[:multiplex_id].to_i
|
|
end
|
|
|
|
end
|
|
|
|
|
|
end
|
|
|