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WebApp Sec: Re: [Webappsec] Tacking A Difficult Problem - Solutions HTTP Response Splitting

Re: [Webappsec] Tacking A Difficult Problem - Solutions HTTP Response Splitting

From: Amit Klein <aksecurity_at_gmail.com>
Date: Sat, 21 Apr 2007 02:42:45 +0200

Arian J. Evans wrote:
> <inline>
> On 4/20/07, *Amit Klein* <aksecurity_at_gmail.com
> <mailto:aksecurity_at_gmail.com>> wrote:
>
> Arian J. Evans wrote:
> > Q: "How?"
> > Scanner Jockey: ...
> > <Blink>
> >
>
> Okay, I think I understand what scanner folks mean. The thing is, HTTP
> Response Splitting can be viewed as a special case of a wider attack -
> HTTP Response Header injection. Through the latter attack, you can
>
>
> No, I mean, people think they are injecting a header into *the* response.
>

They do!

Consider a situation like this: you have an injection point in the
Location response header of a 302 response. You inject:
foo%0d%0aSet-Cookie:%20bar=baz

The net result is a 302 response e.g.:

HTTP/1.1 302 Redirect
Location: foo
Set-Cookie: bar=baz
Content-Lenght: 0

So cookie setting it is, through HTTP response header injection.
Naturally the scanners recognize this as (also) HTTP Response Splitting
(you could inject a whole new response in there). Hence the confusion.

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Received on Apr 20 2007

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