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Network Security Snort-Signatures
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Re: [Snort-sigs] false +ves on IMAP fetch overflow attempt: sid 3070

from [Frank Knobbe] Network Security [Permanent Link]
Subject: Re: [Snort-sigs] false +ves on IMAP fetch overflow attempt: sid 3070
Date: Mon, 24 Jan 2005 22:17:05 -0600 
On Tue, 2005-01-25 at 15:05 +1300, Russell Fulton wrote:

I am seeing many hits on this rule for what appear to be perfectly
normal IMAP requests.

[...] My understanding of this is that we are looking for a newline within 100
characters of 'FETCH' and alerting if we don't find it.  Unfortunately
there are many legitimate FETCH requests that are longer than 100 chars.
[..] I will be disabling this rule.


Russell,

instead of disabling it, why not just increase the amount of characters?
Perhaps... say... 300? That should be less noisy but still catch
attempts of people trying to overflow the server with long packets.

Regards,
Frank

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