[Oisf-users] Suricata 4.0 rule fork

Alan Amesbury amesbury at oitsec.umn.edu
Tue Nov 28 16:29:58 UTC 2017

This message made its way to me via a coworker; my "digest" version apparently isn't due out for another half hour or so, so apologies for any misquoting.

Francis Trudeau wrote:

> The new Suricata 4.0 rules have been live on the production servers
> since Thanksgiving.  Sorry for the notification delay, we wanted to
> see what happened over the US holiday weekend, and everything looks
> good.
> Please use the version number of your engine in the URL you use to
> retrieve the set.  We changed how it works now, and some paths that
> worked before will no longer work.  This was done to ensure people got
> the right set for their engine.  Please check your sensors and make
> sure everything is updating correctly.

Are rulesets backwards compatible?  For example, can I run a ruleset intended for a v2.x version of Suricata on a 4.x version?  I have a pair of sensors that for ${REASON} haven't been able to upgrade.  The bulk are on a v3.x version, but I have some running 2.x.

Also, is there a definitive list of the ruleset version differences somewhere, e.g., which features require which engine version?  I looked at


but didn't see any v3.x vs v4.x differences highlighted.  In contrast, I see notes specific to v1.x and v2.x in section "Appendix A - Buffers, list_id values, and Registration Order for Suricata 1.3.4" (although the table in is unreadable due to truncation).

Alan Amesbury
University Information Security

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