Snort mailing list archives
Reputation Preprocessor Question - Blacklist causing packets to skip other preprocessors and rule engine
From: Noah Dietrich <noah_dietrich () 86penny org>
Date: Sat, 12 Dec 2015 16:57:57 +0100
Hello, My question is in relation to the reputation processor in Snort when running in NIDS mode. I have snort working correctly with the reputation processor (alerts are generated by the reputation preprocessor when a packet comes from a blacklisted host), but it seems that if a packet comes from a host that is blacklisted, the packet is NOT processed by the rule engine (and possibly the other preprocessors) after generating the reputation preprocessor alert. I verified this with a simple configuration (two rules in my local.rules, with no other rules enabled), one to alert on preprocessor blacklist alerts, and another one for all ICMP events. When i ping my snort sensor from a host on the blacklist, I get the alert generated by the preprocessor, but NOT from my ICMP rule. When I remove that host from the blacklist and ping again, I get the alerts from my ICMP rule. I also noted that I received echo replies from the snort sensor for each ICMP request I sent (running in NIDS mode, this makes sense). It seems that when Snort is running in NIDS mode, and it sees a packet from a blacklisted host, that it should generate the reputation preprocessor blacklist alert, but that the packet should still be processed by the other preprocessors and the rule engine (if not by default, at least with a preprocessor configuration option). Thank you, noah
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- Reputation Preprocessor Question - Blacklist causing packets to skip other preprocessors and rule engine Noah Dietrich (Dec 12)