[Snort-users] Ignoring Backups - TCP Stateful?

Doug Burks doug.burks at ...11827...
Fri Dec 5 16:30:23 EST 2014

Replies inline.

On Fri, Dec 5, 2014 at 4:18 PM, Colony.Three <Colony.Three at ...17037...> wrote:
> So evidently Snorby has just been stupidly reporting -0- events for days,
> without giving ANY indication that netsniff-ng, snort-1, and prads WEREN'T
> EVEN RUNNING!  So I sure can't depend on Snorby as a remote monitor for SO.

Snorby wasn't designed to monitor sniffing processes.  It was designed
to monitor IDS alerts.

> I've been told several methods for restarting SecurityOnion so I don't know
> which is right, but using:
> # service nsm-sensor restart
> ... it tells me the above three daemons are failing (so I now know) and to
> refer to the respective error logs.
> I've put the logs here:
> https://pastee.org/954jm

In addition to the bpf syntax error I mentioned in my previous email,
I also see the following Snort error:
ERROR: The dynamic detection library
"/usr/local/lib/snort_dynamicrules/file-image.so" version 1.0 compiled
with dynamic engine library version 2.1 isn't compatible with the
current dynamic engine library
"/usr/lib/snort_dynamicengine/libsf_engine.so" version 2.4.

Please see:

> Looks like SO is really hosed again.

I wouldn't say "really hosed".  These issues can be resolved.

> -------- Original Message --------
> Subject: Re: [Snort-users] Ignoring Backups - TCP Stateful?
> Time (GMT): Dec 05 2014 20:51:43
> From: Colony.Three at ...17037...
> To: snort-users at lists.sourceforge.net
> On Fri, Dec 5, 2014 at 2:40 PM, Colony.Three wrote:
>> I am at a loss. I don't even know whether SecurityOnion is capturing
>> packets or not.
> "sudo sostat" can help you with this. If you need help interpreting
> the sostat output, please run the following command:
> sudo sostat-redacted
> https://pastee.org/523b3
> Evidently something is seriously wrong.  This has happened on several of my
> reinstalls of SO, and I always have to reinstall to fix it.  Although by now
> I've about forgotten how to do a full reinstall with rule tweaking.
>> Either my rules modifications were perfect, or nothing's
>> being captured.
>> I infer that ELSA would be the best way to see recent actual basic packet
>> traffic, but Firefox will not let me in. "localhost:3154 uses an invalid
>> security certificate"
> Have you tried to configure Firefox to accept the self-signed certificate?
> Of course.  Firefox, when it comes upon a private cert, gives the option of
> getting out, or going into Technical Details.  I click the latter, and it
> immediately gives the "localhost:3154 uses an invalid security certificate"
> with nothing to click nor any path forward.  I've never seen it do this.
> Chromium is by G**gle and I can't use that.
> http://oi58.tinypic.com/2hmn4hz.jpg
>> ... much less do I know how to determine whether my backups are excluded
>> from packet capture. I can't do backups until I'm sure the packets are
>> -not- being captured. It's been almost a week now since my last backups.
> Have you tried my previous BPF suggestion? Would it help to simplify
> the BPF by removing "src"? So something like this?
> not(tcp host and tcp port 8027)
> You could test your BPF using tcpdump in real time while running a test
> backup.
> It's not clear to me whether tcpdump -causes- the traffic monitor, or
> depends on some socket to listen for and print packets.
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Doug Burks
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