Module: Msf::Exploit::Remote::DCERPC_EPM

Included in:
DCERPC
Defined in:
lib/msf/core/exploit/remote/dcerpc_epm.rb

Overview

This module provides service-specific methods for the DCERPC exploit mixin

Instance Method Summary collapse

Instance Method Details

#dcerpc_endpoint_find_tcp(host, uuid, vers, transport) ⇒ Object

Contact the endpoint mapper of the target host and find the transport



12
13
14
15
16
17
18
19
20
21
22
23
24
 
# File 'lib/msf/core/exploit/remote/dcerpc_epm.rb', line 12

def dcerpc_endpoint_find_tcp(host, uuid, vers, transport)
  res = dcerpc_endpoint_list()
  return nil if not res

  uuid.downcase!
  res.each do |ent|
    if (ent[:uuid] == uuid and ent[:vers] == vers and ent[:prot] == 'tcp')
      return ent[:port]
    end
  end

  nil
end

#dcerpc_endpoint_find_udp(host, uuid, vers, transport) ⇒ Object

Contact the endpoint mapper of the target host and find the transport



27
28
29
30
31
32
33
34
35
36
37
38
 
# File 'lib/msf/core/exploit/remote/dcerpc_epm.rb', line 27

def dcerpc_endpoint_find_udp(host, uuid, vers, transport)
  res = dcerpc_endpoint_list()
  return nil if not res

  res.each do |ent|
    if (ent[:uuid] == uuid and ent[:vers] == vers and ent[:prot] == 'udp')
      return ent[:port]
    end
  end

  nil
end

#dcerpc_endpoint_list ⇒ Object

Contact the endpoint mapper and create a hash of all endpoints



41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
 
# File 'lib/msf/core/exploit/remote/dcerpc_epm.rb', line 41

def dcerpc_endpoint_list
  res = []

  print_status("Connecting to the endpoint mapper service...")
  begin
    eps   = nil
    dport = datastore['RPORT']
    dport = 135 if (dport.nil? || dport == 0)

    begin
      eps = Rex::Socket::Tcp.create(
        'PeerHost'  => rhost,
        'PeerPort'  => dport,
        'Proxies'   => proxies,
        'Context'   =>
        {
          'Msf'        => framework,
          'MsfExploit' => self,
        }
      )
    rescue ::Exception
    end

    if (not eps)
      print_status("Could not connect to the endpoint mapper service")
      return nil
    end

    eph = dcerpc_handle('e1af8308-5d1f-11c9-91a4-08002b14a0fa', '3.0', 'ncacn_ip_tcp', [dport])
    opt = { 'Msf' => framework, 'MsfExploit' => self }
    dce = Rex::Proto::DCERPC::Client.new(eph, eps, opt)

    hnd = nil

    while(true)

      # Placeholders
      info =
      {
        :type => nil,
        :port => nil,
        :host => nil,
        :pipe => nil,
        :prot => nil,
        :uuid => nil,
        :vers => nil,
        :note => nil
      }

      data = nil

      if(not hnd)
        # NULL handle to start with
        data = [0, 0, 0, 0, 0, 0, 0, 0, 0, 1].pack("V*")
      else
        # Break the loop early if we get another NULL handle
        break if hnd == [0, 0, 0, 0, 1].pack("V*")

        # Use the existing handle if we already have one
        data = [0, 0, 0, 0, 0].pack("V*") + hnd
      end

      ret = dce.call(2, data)

      if (
        dce.last_response == nil or
        dce.last_response.stub_data == nil or
        dce.last_response.stub_data.length < 40 or
        dce.last_response.stub_data[36,4] == "\xd6\xa0\xc9\x16"
      )
        # break from the parsing loop
        break
      end

      # Record the response data
      buf = dce.last_response.stub_data

      # Record the handle if needed
      hnd = buf[4, 20] if not hnd

      # Parse the response data
      nlen = buf[60, 4].unpack('V')[0]
      if (nlen > 1)
        info[:note] = buf[64, nlen - 1]
      end

      # Align the stub offset
      soff = nlen + 72
      while (soff % 4 != 0)
        soff += 1
      end

      # Determine number of records
      rcnt = buf[soff, 2].unpack('v')[0]
      soff += 2

      # Parse the data from the stack
      1.upto(rcnt) do |i|
        rlen = buf[soff, 2].unpack('v')[0]
        soff += 2

        if (i == 1)
          info[:uuid] = Rex::Proto::DCERPC::UUID.uuid_unpack(buf[soff+1, 16])
          info[:vers] = buf[soff+17,2].unpack('CC').map{|s| s.to_s}.join(".")
        end

        if (i > 3)
          info[:type] = buf[soff, 1].unpack("C*")[0]
        end

        soff += rlen

        xlen = buf[soff, 2].unpack('v')[0]
        soff += 2

        case info[:type]
        when nil

        # TCP
        when 7
          info[:prot] = 'tcp'
          info[:port] = buf[soff, 2].unpack('n')[0]

        # UDP
        when 8
          info[:prot] = 'udp'
          info[:port] = buf[soff, 2].unpack('n')[0]

        # ADDR
        when 9
          info[:host] = buf[soff, 4].unpack('C4').join('.')

        # PIPE
        when 15
          info[:prot] = 'pipe'
          info[:pipe] = buf[soff, xlen].unpack("a*")[0]

        # LRPC
        when 16
          info[:prot] = 'lrpc'
          info[:pipe] = buf[soff, xlen].unpack("a*")[0]

        # NETBIOS
        when 17,24
          info[:host] = buf[soff, xlen].unpack("a*")[0]

        # HTTP
        when 31
          info[:prot] = 'http'
          info[:port] = buf[soff, 2].unpack('n')[0]

        # DYNAMIC?
        when 22
          # not parsed
        else
          print_status("EPM unknown type: #{info[:type]} #{buf[soff, xlen].unpack("H*")[0]}")
        end

        soff += xlen
      end

      info[:pipe].gsub!("\x00", '') if info[:pipe]
      info[:host].gsub!("\x00", '') if info[:host]

      res << info

      # Handle a buggy response from a Likewise server that can result in a loop otherwise
      break if hnd == [0, 0, 0, 0, 0, 0, 0, 0, 0, 1].pack("V*")
    end

  rescue ::Interrupt
    raise $!

  rescue ::Exception => e
    print_status("Could not obtain the endpoint list: #{e}")
    res = nil
  end

  res
end