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Network Security Snort-Signatures
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Re: [Snort-sigs] Possible improvements to pop3 rules.

from [Frank Knobbe] Network Security [Permanent Link]
Subject: Re: [Snort-sigs] Possible improvements to pop3 rules.
Date: Wed, 04 May 2005 07:51:12 -0500 
On Wed, 2005-05-04 at 08:04 -0400, Michael Stone wrote:

On Wed, May 04, 2005 at 02:56:59PM +1000, Erik de Castro Lopo wrote:

Here we have a search of the string "USER" followed by the given
PCRE search. However, the PCRE is anchored to the start of the
packet. 


Hmm. That's bogus. There's no reason that the USER has to be at the
start of the packet.



Heh... actually, I think I have to agree. The USER has to be at the
beginning on the line, but that doesn't have to be the beginning of the
_stream_. By default, POP3 sessions are reassembled (and some people
probably reassemble all TCP streams). USER doesn't have to be at the
beginning of the stream. One can enter a bogus command, like HELP or
something, before issuing USER.

Perhaps the rule is better kept as it is.

Cheers,
Frank

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