FreeBSD Security Advisory FreeBSD-SA-14:08.tcp

[Ronald F. Guilmette]

In message <CAABACD8BCAE7B4B8A7906EEDC9DEBC5024EFDCD at IAD-WPRD-XCHB01.corp.verio
.net>, "David DeSimone" <ddesimone at verio.net> wrote:

>Are you perhaps confusing IP Fragment Reassembly with the similar but
>unrelated TCP Segment Reassembly?

That's entirely possible.  I have near zero experience with or understanding
of either of these types of packet fragmentation.

>My understanding is that TCP stacks normally try very hard not to
>generate IP fragments in a TCP stream.
>
>It appears that this bug report relates only to TCP Reassembly, and has
>nothing to do with IP Fragments.  But perhaps I am misreading it?

OK, so how would one block all incoming *TCP* fragments... you know...
in order to render this specific security issue a non-issue?  (I personally
am already blocking inbound IP fragments viw ipfw.)