ASP.NET - Trust Level = Full?

Todd Friedlich picture Todd Friedlich · Jan 20, 2009 · Viewed 13.5k times · Source

I recently joined a firm and when analyzing their environment I noticed that the SharePoint web.config had the trust level set to Full. I know this is an absolutely terrible practice and was hoping the stackoverflow community could help me outline the flaws in this decision.

Oh, it appears this decision was made to allow the developers to deploy dlls to the Bin folder without creating CAS policies. Sigh.

Just want to clarify and make matters worse, we are also deploying third party code to this web application.

Answer

Tom Resing picture Tom Resing · Jun 11, 2009

Todd,

The book, "Programming Microsoft ASP.Net 3.5", by Dino Espisito provides some sound reasoning for not allowing Full Trust in ASP.Net applications.

Among other reasons, Dino states that web applications exposed to the internet are "one of the most hostile environments for computer security you can imagine." And:

a publicly exposed fully trusted application is a potential platform for hackers to launch attacks. The less an application is trusted, the more secure that application happens to be.

I'm surprised the StackOverflow community did not outline the problem with Full Trust better. I was hoping for the same thing so I didn't have to go digging through my pile of books to find the answer, lazy me.