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error.aspx aspxerrorpath=/webresource.axd Atlantic, Virginia

As a side note : you *really* can't start changing the HTTP status codes used in HTTP responses as not only would this make your IIS non RFC compliant as an But the infragistics controls still don't work. If you've ever had a site penetration tested, there are plenty of false positives to be sifted through like this. Always returning the same HTTP code and sending them to the same place is one way to help block it.

This is a temporary workaround that closes the public attack vector - once we release a patch you can revert back to the behavior where your error pages are different. Just in case you haven’t already heard about the exploit or seen what it can do, watch this before reading any further. This vulnerability impacts ASP.NET resources (not just ASPX pages). Summary We will post more details as we learn more, and will also be releasing a patch that can be used to correct the root cause of the issue (and avoid

Am I vulnerable? Could you check if its resources are properly loaded? Thanks a lot! Best Regards, Maya Kirova Developer Support Engineer II Infragistics, Inc.

Hope this helps, Scott ScottGu - Saturday, September 18, 2010 9:02:58 PM @Ken, >>>>>>> can't use status code error pages anymore!? The code of the error.aspx with the random sleep delay can be found on the Microsoft Security Advisory 2416728 page. OWA might not be using standard Forms Auth etc, but I haven’t heard the definitive word on this. Check if you have any references set to CopyLocal=False.

To check what file the web resource handler is not finding you can decrypt the hash code provided on the WebResource.axd url. Can one configure the ViewState encryption algorithm to use something besides AES? Rabin - Saturday, September 18, 2010 4:16:01 PM @Scott, thanks for this info! Do you know what other flag options exists and what do they mean?

Cordially, Lee Lee Cichanowicz - Saturday, September 18, 2010 4:13:49 PM Thank you Scott, this is good to know. Hope this helps, Scott ScottGu - Saturday, September 18, 2010 9:02:02 PM @TaoYang, >>>>>>> Thank you for the information! share|improve this answer edited Jun 3 '14 at 10:00 dmportella 3,6681742 answered Jan 12 '09 at 12:50 Diadistis 9,11612245 2 The link is broken. It takes just 2 minutes to sign up (and it's free!).

In order to do this, different amounts of padding are required for different string lengths: One thing you’ll notice is that each padding byte represents the total number of bytes in who lets the default error page with exception information show on a production server? Thanks. Thus, what it has done is, it has supressed the "404 Not Found" error.

There are lots of different platform matrixes and localization languages to build/test/verify which is why producing a patch with high confidence enough to deploy automatically across millions of machines takes a Why is the spacesuit design so strange in Sunshine? Please note that the website works locally on the server of our customer. Food for thought :)BTW, someone left me a comment on my post about the padding oracle today which seems to demonstrate a way to force the underlying server error - regardless

The exploit in action Let’s start out with a bang. We will patch the vulnerability itself in ASP.NET - at which point the workaround isn't required. Privacy Statement| Terms of Use| Contact Us| Advertise With Us| CMS by Umbraco| Hosted on Microsoft Azure Feedback on ASP.NET| File Bugs| Support Lifecycle Toggle navigation ScottGu's Blog Home About RSS I've come across that before...

Hope this helps, Scott ScottGu - Saturday, September 18, 2010 10:39:49 PM @Rinat, >>>>>>> How does custom errors setting prevent the exploit? You do not need to compile this into an application – you can optionally just save it into the application directory on your web-server: <%@ Page Language="C#" AutoEventWireup="true" %> <%@ Import The vulnerability exists not only in asp.net but in most other frameworks, like java. Will this download appear in the IIS logs?

After many struggles I found out that this was because I was using the Page.ClientScript.GetWebResourceUrl in a class deriving from another class which resided outside of the assembly my resource was Yes - all versions of ASP.NET are affected, including ASP.NET MVC. Install and Enable IIS URLScan with a Custom Rule If you do not already have the IIS URLScan module installed on your IIS web server, please download and install it: x86 Amy September 25. 2010 09:32 Great idea!

up vote 24 down vote favorite 7 I get a 404 HTTP status error (not found) on a specific WebResource.axd call inside an ASP.NET 3.5 (AJAX) web application. BTW, from my tests, the vulnerability can not be used to decrypt asp.net forms authentication cookie, since asp.net forms auth mechanism does not return any error. I don't work in IDS sales, but I wish I did - now would be a great time to be able to sell a few more boxes ! Hope this helps, Scott ScottGu - Saturday, September 18, 2010 7:58:10 PM @Anthony, >>>>>>>I have my own error module I use to return different error pages.

Sign up now! One thing’s for sure, it will require some legwork and getting started on the mitigation early by following his guidance is the only smart thing to do at this stage. This time the customer whom reported the problem was using Forms Authentication in his application so the first time an unauthenticated user browsed it, he was redirected to the login page The other thing that might be worth looking for is response duration over "n" enumerations.

Is that right ? This request is processed and the error.aspx page served resulting in a "200 OK" response from the server. Hope this helps, Scott ScottGu - Saturday, September 18, 2010 9:00:11 PM @David, >>>>>>> Thanks for the tip- I'm assuming this affects DotNetNuke sites as well? Before I move on to the steps, let me quickly give a brief idea about one of the most important factors that aid this exploitation mechanism as this will be the