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Sep 30, 2010

ASP.NET padding vulnerability explained and exploited

First of all, the ASP.NET padding oracle patch is now available through Microsoft Update. Patch your servers before you keep on reading!

The saga goes on as lots of information on the ASP.NET padding oracle vulnerability is becoming available around the Internet. Many articles surface that range from days to weeks old. One example is this very detailed explanation of the padding oracle attack, dated September 14th. Linked in the article is the Padbuster tool, which was updated to attack ASP.NET sites in version 0.2 quite recently. Others have also released tools, like the one at Minded Security Blog, dated Tuesday 28th. Note the fortnight in between these two posts. Looking at the first one, no wonder Microsoft was in a hurry to get a patch out!

With the current state of affairs, it would be reckless to not patch Internet facing servers. New tools to exploit ASP.NET are popping up rapidly around the Internet. Web application scanners will be updated to check for the vulnerability. If you still haven't patched your servers, start reading this post from the top again — but this time read the first sentence!

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