'Padding Oracle' Crypto Attack Affects Millions of ASP.NET Apps

[Thai Duong]

On Tue, Sep 28, 2010 at 12:49 PM, Peter Gutmann
<pgut001 at cs.auckland.ac.nz> wrote:

> Ye gods, how can you screw something that simple up that much?  They use the
> appropriate, and secure, HMAC-SHA1 and AES, but manage to apply it backwards!

I guess they just follow SSL.

BTW, they screw up more badly in other places. Download .NET
Reflector, decompile .NET source, and do a grep 'DecryptString',
you'll see at least three places where they don't even use a MAC at
all.

Thai.

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