Validating xml against dtd in java

Rated 3.99/5 based on 799 customer reviews

It can take upwards of 90 regular expressions (see the CSS Cheat Sheet in the Development Guide 2.0) to eliminate known malicious software, and each regex needs to be run over every field. Just rejecting "current known bad" (which is at the time of writing hundreds of strings and literally millions of combinations) is insufficient if the input is a string.This strategy is directly akin to anti-virus pattern updates.Data from the client should never be trusted for the client has every possibility to tamper with the data.In many cases, Encoding has the potential to defuse attacks that rely on lack of input validation.

Often the best approach is the simplest in terms of code.Otherwise, you are allowing attackers to repeatedly attack your application until they find a vulnerability that you haven't protected against.Detecting attempts to find these weaknesses is a critical protection mechanism.Note that you should proceed to validate the resulting numbers as well.As you see, this is not only beneficial for security, but it also allows you to accept and use a wider range of valid user input.

Leave a Reply