Firefox cross-site scripting issue

[joelcc]

After blocking the above issue I had another finding and decided to block the <xss tag with

if (ContainsText(AParam, '<xss')) then
AllowIt := False;

Doing this stops the following:

https://somesite.com/providers/IsProvide...tion.dll//$/callback?callback=whs%22%3E%3Cxss%20onmousemove%3d%22alert``%22%3etest%3c%2fxss%3e

I guess it should be added to the list of things to block by default so I am posting it here?

[joelcc]

I am adding to this thread so everyone has the final update.

Since there is a large list of the cross site scripting (see https://portswigger.net/web-security/cro...heat-sheet) that "according to the testing company" can be used against a website through parameters, I ended up blocking all of the parameters by the servercontroller->OnParseParameter. I then wrote code to handle the params that I did want to allow.

This passed the security audit checks so I am moving on.