Hi guys,
I looked at some microsoft documentation (
http://www.microsoft.com/downloads/details.aspx?FamilyID=e9c4bfaa-af88-4aa5-88d4-0dea898c31b9
), and appear that .NET framework prevent a bunch of
web attack classes.
Also appear that this security enhancement is in .NET
framework, providing programming functions and
features that help to make .apsx applications more
safe, however many parts yet are responsible from the
developer, like input valudation. So in the reality
doesn't appear that .NET framework provide a robust
barrier to protect against this attacks (like a web
application firewalll, example F5 web firewall), i'm
right? Even cause they suggest to use aditional
IISLockdown, URLscan, ISAPI filter, etc.
My main doubt is, is there any evasion methods used to
bypass this common chcecks provided from .NET
framework to difficult SQL injections, XSS, etc?
I made some tests in a new lab machine installed with
Windows 2003, SQL server and IIS. All inputed were
well validaded, so i were not able to abuse of any sql
injection or xss (maybe it's in the .aspx code that
were well wrote? Maybe in the .NET framework that
prevent some attacks like a web application firewall?
Maybe a IISLockdown + URLScan + ISAPI filter),
however I think it doesn't check/filter session
values, I made a test setting the "Cookie" value with
some chars like quote (as used in sql injection tests
via url) and I got this error from the application
(showing the server is using a SQL Server):
invalid character value for cast specification
I never tryed to exploit a sql injection in cookie
values and never had seen this error before (which
appear to be a cast conversion error).... any tip for
me? Any document (link) ?
Also I know (cause the server is in my lab) that some
this filters in input validation are been made by the
.apsx code, cause the developer made it. But a
attacker is able to remotly recoganize who is making
this checks (if it's in the .aspx code that were well
wrote? If in the .NET framework that prevent some
attacks like a web application firewall? If is a
IISLockdown + URLScan + ISAPI filter)? How?
thank you,
Cheers
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Received on Feb 07 2007
Intro
