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Re: [Full-Disclosure] Re: Bypassing "smart" IDSes with misdirected frames? (long and boring)
From: Michal Zalewski (lcamtuf
ghettot.org)
Date: Fri May 28 2004 - 11:21:39 CDT
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On Fri, 28 May 2004, Jim Bauer wrote:
> The IDS will see not see a valid response to the "DATA" command (that is
> never received) so it will know it is still in SMTP command mode. Even
> if your not-so-smart IDS let this slip by, there is still the issue of
> "DEBUG" not being in a valid format for a header.
Which is precisely what I stated in the next paragraph. This is a naive
example, but illustrates w far broader and non-SMTP-specific problem quite
well. There are various protocols or attack vectors that do not involve
challenge-response communications (even the problem of distinguishing
between message body and message headers can be an example).
Cheers,
--
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Michal Zalewski * [http://lcamtuf.coredump.cx]
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