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Date: Wed, 15 Aug 2018 12:06:54 +0200
From: Marcus Meissner <meissner@...e.de>
To: oss-security@...ts.openwall.com
Subject: Re: CVE-2018-5391: Linux kernel: IP fragments with
 random offsets allow a remote denial of service (FragmentSmack)

Hi,

no.

SegmentSmack affects TCP segments,
FragmentSmack affects IP fragments (lower protocol level).

Ciao, Marcus
On Tue, Aug 14, 2018 at 05:09:38PM -0400, David T. wrote:
> Is this the same as "SegmentSmack" that came out last week, CVE-2018-5390?
> Or, what is the difference?
> 
> On Tue, Aug 14, 2018 at 16:31 Vladis Dronov <vdronov@...hat.com> wrote:
> 
> > Heololo,
> >
> > A flaw named FragmentSmack was found in the way the Linux kernel handled
> > reassembly of fragmented IPv4 and IPv6 packets. A remote attacker could
> > use this flaw to trigger time and calculation expensive fragment reassembly
> > algorithms by sending specially crafted packets which could lead to a CPU
> > saturation and hence a denial of service on the system.
> >
> > External References:
> >
> > https://www.kb.cert.org/vuls/id/641765
> >
> > https://access.redhat.com/articles/3553061
> >
> > https://bugzilla.redhat.com/show_bug.cgi?id=1609664
> >
> > Best regards,
> > Vladis Dronov | Red Hat, Inc. | Product Security Engineer
> >
> -- 
> Very respectfully,
> 
> David M Thomsen

-- 
Marcus Meissner,SUSE LINUX GmbH; Maxfeldstrasse 5; D-90409 Nuernberg; Zi. 3.1-33,+49-911-740 53-432,,serv=loki,mail=wotan,type=real <meissner@...e.de>

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