Well, today I deployed an early version of my wp-aspxrewriter component to my personal blog. This component is an ASP.NET HttpModule in conjunction with a Wordpress plugin and code hack (official patch for the hack submitted at their trac site) which allows 100% pretty permalinks under IIS6. The current mechanism is grim. A request to a non-existent .aspx page invokes the handler.

Well, long time no post. Been in hospital. Been busy with college. Life gets in the way of hacking. Usually when one wast to illustrate an XSS vulnerability there are two approaches. The first is to show the client the XSS and assume that they know and understand the impact. The second is to write a fully fledged exploit which takes some form of action on the client's server so that they can see the truly devastating impact.

There's been a fair bit of discussion going on at slackers on the security implications of the Unicode characters U+202D and U+202E which switch the left-to-right and right-to-left encoding of the following text.

One of the biggest problems faced when writing Javascript that modifies the DOM is the fact that the poorly written IE7 crashes because it hasn't finished loading the current element. This only seems to happen when the DOM is modified through a script loaded by an xx:expression binding in a style tag.

I know I haven't posted anything here for a good while, but that's because on top of uni work I have a surprise up my sleeve in the not so distant future. I also do intend to continue working on .NETIDS when I finally get some time! This is not that surprising... but something I found interesting. A certain musical group, whom I will not name here, recently changed their forum onto a new proprietary system.

Just thought I'd share the following script vector with you all that I came up with while stressing PHPIDS today: {% highlight javascript %} l= 0 || 'str',m= 0 || 'sub',x= 0 || 'al',y= 0 || 'ev',g= 0 || 'tion.h',f= 0 || 'ash',k= 0 || 'loca',d= (k) + (g) + (f),a=0 || (y) + (x),b=1[a](d),c=0 || (m) + (l),1[a](b[c](1)); {% endhighlight %} Put that inside a script block and believe it or not it will eval the text after the fragment identifier.

There's such a wealth of new XSS vectors coming out of the work on phpids that I couldn't resist sharing a few of the tastier morsels here. The original thread is over at sla.ckers if you want to read it there!

Whilst working on the next release of .NETIDS I came across some interesting info about the parsing of numbers within JavaScript - information that is of particular relevance when it comes to filtering against String.fromCharCode injection attempts. The first item of interest is that JavaScript will parse hexadecimal in the form 0xYY even when not enclosed in quotes (ie. as a string), so this can be used in fromCharCode.

This is a well known trick that I just wanted to share as it is so crucial in preventing effective XSS attacks in Internet Explorer (and hopefully soon FireFox). Anyway, the method is simple, whack this under the <system.web> section of your web.config file: {% highlight xml %} {% endhighlight %} Tada! HttpOnly cookies in .NET 2.0 was originally published by Martin Paul Eve at Martin Paul Eve on June 26, 2007.

One of the questions I see most frequently on Freenode's ##csharp irc channel is how to use a MySql Database in .NET. I've therefore provided the class that I use for basic database operations.

Just a quick note to announce the release of .NETIDS v.0.1.1.0 - a small update that adds some valuable features: Fixed bug of empty Report.Tags object Added options to SecurePage to disable each type of scanning Updated filters Most significantly this means that you can control whether page Output Scanning is performed from a SecurePage derived page.