Important Snort and Suricata Package Announcement -- probable bug in Legacy Blocking Module

[Bob.Dig]

@bmeeks Checked. The only thing of note, I block only for 15 mins, so right now there are "only" 33 blocks and no snort-rules.
suricata 7.0.2

[Cool_Corona]

@Bob-Dig Run it "infinete" and you will see :)

[Bob.Dig]

@Bob-Dig said in Important Snort and Suricata Package Announcement -- probable bug in Legacy Blocking Module:

I block only for 15 mins, so right now there are "only" 33 blocks and no snort-rules.
suricata 7.0.2

Run it over night, still no problem, will stop it now.

[fireodo]

@Bob-Dig said in Important Snort and Suricata Package Announcement -- probable bug in Legacy Blocking Module:

Run it over night, still no problem, will stop it now.

Probably, in your case, the second condition (kill states is the main one) is not occurring (considering Bill Meeks theory) so there is no crash ...

[Bob.Dig]

@fireodo My theory is, it is a snort problem, not suricata. Let's see.

[fireodo]

@Bob-Dig said in Important Snort and Suricata Package Announcement -- probable bug in Legacy Blocking Module:

@fireodo My theory is, it is a snort problem, not suricata. Let's see.

[slu]

@bmeeks

don't see such an issue on my two 2.7.0 CE boxes:
2.7.0 CE
Snort 4.1.6_13
Legacy Mode
Kill States enabled

[Gblenn]

I have Suricata running in Legacy mode at two different sites, (2.7.0 and 23.09). Both with Kill States enabled and no problems whatsoever...

[Bob.Dig]

@slu Do you have actually blocks?

[Gblenn]

@Bob-Dig Yes I do, and I have the Remove Blocked Hosts Interval set to 1h but could change it to something higher if that would have an effect?
Up until a few days ago I have had the 23.09 site set up with Block on DROP Only NOT being checked. Meaning I had every single Alert resulting in a Block and basically having built up a Passlist that works for me. As a result I would usually see quite a long list in the Blocks tab. Most of them ET INFO actually, but still blocks.
The 2.7.0 site is also set up this way, but it's for our vacation home so not much going on there at the moment.

[slu]

@Bob-Dig
good point, no, not at the moment.

[Gblenn]

@slu said in Important Snort and Suricata Package Announcement -- probable bug in Legacy Blocking Module:

@Bob-Dig
good point, no, not at the moment.

Ah, that was a question to you obviously...

[slu]

@Bob-Dig said in Important Snort and Suricata Package Announcement -- probable bug in Legacy Blocking Module:

@slu Do you have actually blocks?

You are right, searching in the logs and found it:

Nov 15 06:47:55 	kernel 		pid 44159 (snort), jid 0, uid 0: exited on signal 11 (core dumped)

[Bob.Dig]

@slu said in Important Snort and Suricata Package Announcement -- probable bug in Legacy Blocking Module:

You are right, searching in the logs and found it:

I didn't searched in the logs. I think, it will disable IPS on that interface and is easy to spot in the GUI? At least I hope.

[johnpitton]

I have a few Netgate 7100 units all running 23.09 with Snort VRT rules in legacy Blocking mode and Kill State enabled with 7 days blocking set.
They've been at this 23.09 ver for almost a week now and stable.
All of them have active blocks listed.
I checked and verified SNORT rulesets have been updating successfully.
I don't see in any of the logs any signal 11 core dumps logged.

[bmeeks]

@johnpitton said in Important Snort and Suricata Package Announcement -- probable bug in Legacy Blocking Module:

I have a few Netgate 7100 units all running 23.09 with Snort VRT rules in legacy Blocking mode and Kill State enabled with 7 days blocking set.
They've been at this 23.09 ver for almost a week now and stable.
All of them have active blocks listed.
I checked and verified SNORT rulesets have been updating successfully.
I don't see in any of the logs any signal 11 core dumps logged.

What version of the Snort package is installed on your box? Look under SYSTEM > PACKAGE MANAGER and post back the version shown there. There has been an issue with the package builder for 23.09, so my understanding is that some of the most recent package updates have not been deployed in that branch.

[johnpitton]

@bmeeks

[bmeeks]

@johnpitton said in Important Snort and Suricata Package Announcement -- probable bug in Legacy Blocking Module:

@bmeeks

Yes, that is the older version of the package. Current is now 4.1.6_13 for the GUI and 2.9.20_5 for the associated binary. The newer package is held up currently for 23.09 because of a different problem with the package builder backend. In your case, I would advise sticking with the version you have until we find and squash the bug introduced in the newest package.

Thank you for this data point. It is helpful in my troubleshooting to isolate the new bug. The code change which appears to have introduced the bug happened with the 2.9.20_4 version of the Snort binary.

[bmeeks]

I think I may have found the Signal 11 core dump bug. If I am correct, it's actually in the FreeBSD libpfctl library and not directly in the Snort code. I'm waiting on the Netgate kernel developer I'm working with to either confirm my finding or show me where I went off track analyzing the library code .

[fireodo]

@bmeeks said in Important Snort and Suricata Package Announcement -- probable bug in Legacy Blocking Module:

If I am correct, it's actually in the FreeBSD libpfctl library and not directly in the Snort code.

Just out of curiosity: that could be corrected by rebuilding and replacing that library or there would be necessary a new pfsense revision?