full-disclosure - Re: ASP.NET cannonicalization issue

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Message-ID: <20041007215121.78995.qmail@web52803.mail.yahoo.com>
From: australia001 at yahoo.com.au (Jelson Pat)
Subject: Re:  ASP.NET cannonicalization issue

more technical details :

http://isc.sans.org/diary.php?date=2004-10-06
http://www.k-otik.com/news/10052004.ASPNETFlaw.php
http://blogs.devleap.com/rob/archive/2004/10/02/1803.aspx 
http://www.heise.de/security/news/meldung/51730 

cheers 
Stephen

"Evans, Arian" <Arian.Evans@...hnetsecurity.com> wrote: 
Hadn't seen this on the lists yet:

Cannonicalization issue in ASP.NET

Microsoft is currently investigating a reported
vulnerability in Microsoft ASP.NET. An attacker
can send specially crafted requests to the server
and view secured content without providing the
proper credentials. This reported vulnerability
exists in ASP.NET and does not affect ASP.

http://www.microsoft.com/security/incident/aspnet.mspx

Their interim "fix" is to add an event handler to
force real path validation for all requests:

http://support.microsoft.com/?kbid=887459

Which is certainly not a bad idea but methinks
another performance/security tradeoff at hand.

Thanks for the heads-up Daniel...

Arian Evans
Sr. Security Engineer
FishNet Security

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