[Bro-Dev] [JIRA] (BIT-1045) Review usage of InternalError when parsing network traffic

Vern Paxson vern at icir.org
Mon Jul 29 20:08:30 PDT 2013

> > I suspect that in most cases, a weird should be generated instead, and
> > Bro should just move on to the next packet.
> Agreed, though sometimes they aren't about the traffic but about a
> logic error in decoding it; it would be good to still differentiate
> those cases from a broken packet, however indeed without aborting.

In line with what you frame, the history behind these is that they're meant
to reflect should-never-happen situations; not "weird" activity, but apparent
internal inconsistencies in Bro's processing/execution.  So they don't really
fit with the notion of "weird".  (Of course it's definitely possible there's
some mission-creep and InternalError is misused when Weird really is the
right notion.)

That said, for sure I agree that we don't want to give adversaries a way
to tickle a Bro crash.  So ideally the solution here would be to come up
with something similar to the weird/notice framework, but that expicitly
captures the notion that Bro-is-confused rather than


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