[Snort-users] Unknown POP3 Command

Josh Bitto jbitto at ...16055...
Wed Jun 5 11:28:01 EDT 2013

The only problem with doing a pcap is we use pfsense (open source firewall) and it has snort built into it. There is a way to do a pcap for the offending IP's, but doing it continuously isn't going to happen. I'm already having memory issues with the amount of sensors we have and each one using high amount of memory.

From: James Lay [mailto:digitalx00 at ...11827...]
Sent: Wednesday, June 05, 2013 5:01 AM
To: Snort
Subject: Re: [Snort-users] Unknown POP3 Command

On Jun 4, 2013, at 4:27 PM, Josh Bitto <jbitto at ...16055...<mailto:jbitto at ...846....16055...>> wrote:

I'm getting the following alert...

[142:1:1] (POP) Unknown POP3 command [Classification: Generic Protocol Command Decode] [Priority: 3] {TCP}

Can anyone elaborate to me what this signature is intended for? I know...I know....Do a pcap. I was just curious I couldn't find any definition information on what it's looking at or the call on it.
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My guess is that it didn't conform to any of the commands listed here:


If you're logging to pcap or unified from snort, you should have the offending packet to look at...would be interested to see what's in there myself.  Hope that helps.

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