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Network Security Snort-Signatures
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[Snort-sigs] Multi-protocol flow/stateful rules?

from [Michael Sierchio] Network Security [Permanent Link]
Subject: [Snort-sigs] Multi-protocol flow/stateful rules?
Date: Wed, 07 Sep 2005 07:35:20 -0700 

Forgive the naive question, but I'm looking at flows for
which I'd like to create rules -- in which the stimulus
is an attempted DNS A record query and the response is
ICMP Unreach, or perhaps an attempted BIND exploit in
a DNS response to a PTR query that's the result of an
opened SMTP connection inbound.  Is this possible?

These responses are interesting in themselves, but the
ICMP Unreach case is one in which I'd like to know, in
the rule, whether the ICMP packet is indeed a response
to an outbound UDP packet, or whether the included offending
packet in the ICMP error message was forged.






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