Limiting application's database size

["Thorpe, Jason (TAD)" <Jason.Thorpe () fta dot gov>]

I have a database server that contains several applications.  One of the
applications allow users to enter information into the database without
being authenticated.  My concern is that a malicious script could quickly
increase the size of the database and thus taking all free disk space on the
server.  Is there a way to limit the size of the database so that it will
not affect the other applications?  Or does anybody have any suggestions on
a way to handle this situation.

DB Server: MS SQL Server, IIS