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New Crypto Attack Affects Millions of ASP.NET Apps

Posted by CmdrTaco on Monday September 13, 2010 @04:47AM from the duck-and-cover dept.

Trailrunner7 writes "A pair of security researchers have implemented an attack that exploits the way that ASP.NET Web applications handle encrypted session cookies, a weakness that could enable an attacker to hijack users' online banking sessions and cause other severe problems in vulnerable applications. Experts say that the bug, which will be discussed in detail at the Ekoparty conference in Argentina this week, affects millions of Web applications."

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Re:Who knew! by ammorais · 2010-09-13 04:58 · Score: 5, Interesting

What a surprise, encryption has flaws!
RTFA. It's not about flaws in encryption. It's about "ASP.NET's implementation of AES has a bug in the way that it deals with errors when the encrypted data in a cookie has been modified"
So it's the ASP.NET AES implementation that has flaws. The problem seems to be that the errors reveal enough information about how to decrypt the data.