[Shockroat_private] > I'm curious as to how this could be used in a malicious manner, as opposed to > just being an annoyance. I mean, god forbid, people should execute arbitrary > javascript on us. Yes, we've all seen the file upload form exploit and the > 1001 ways to crash Internet Explorer through infinite loops, but there's > nothing seriously harmful about this, am I right? Please correct me if I'm > wrong. > Yes, you are wrong. :) Let me explain: the javascript issue is not a huge one, although there are some issues. I don't know enough about javascript to get into it. I think the best example of where this could be a problem would on a site like amazon.com. If I can inject HTML into my customer review, I can start reaping passwords or credit card numbers. By studying the format of the amazon HTML, I can make it look like I inserted some sort of prize form into the web page: I ask for their username and password and they press submit... that then posts to a cgi on my server. Boom! I have their account. Or I embed an applet, the net result being the same. This is a real issue. Basically, it boils down the fact that most users will assume that any HTML/Applet/form/script that shows up on a foo.com webpage was authored by someone at foo.com, and any information that they send via their web browser will be going to and only to foo.com. Injection of an attacker's HTML into a a foo.com webpage can exploit this assumption to steal sensitive information. -- Ari there is no spoon ------------------------------------------------------------------------- http://www.nebcorp.com/~regs/pgp for PGP public key
This archive was generated by hypermail 2b30 : Fri Apr 13 2001 - 15:33:25 PDT