From owner-freebsd-stable Thu Nov 2 11:32:59 2000 Delivered-To: freebsd-stable@freebsd.org Received: from dragon.nuxi.com (trang.nuxi.com [209.152.133.57]) by hub.freebsd.org (Postfix) with ESMTP id 6490D37B4CF for ; Thu, 2 Nov 2000 11:32:55 -0800 (PST) Received: (from obrien@localhost) by dragon.nuxi.com (8.9.3/8.9.1) id LAA13926; Thu, 2 Nov 2000 11:32:47 -0800 (PST) (envelope-from obrien) Date: Thu, 2 Nov 2000 11:32:47 -0800 From: "David O'Brien" To: Lauri Laupmaa Cc: "'stable@freebsd.org'" Subject: Re: TCP sequence prediction on freebsd Message-ID: <20001102113247.A13873@dragon.nuxi.com> Reply-To: stable@freebsd.org References: <8E67E032AD23D4118F740050042F21F76F@lant.mbp.ee> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <8E67E032AD23D4118F740050042F21F76F@lant.mbp.ee>; from mauri@aripaev.ee on Thu, Nov 02, 2000 at 02:12:05PM +0200 X-Operating-System: FreeBSD 5.0-CURRENT Organization: The NUXI BSD group X-Pgp-Rsa-Fingerprint: B7 4D 3E E9 11 39 5F A3 90 76 5D 69 58 D9 98 7A X-Pgp-Rsa-Keyid: 1024/34F9F9D5 Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Thu, Nov 02, 2000 at 02:12:05PM +0200, Lauri Laupmaa wrote: > nmap reports something like: > > TCP Sequence Prediction: Class=random positive increments > > Difficulty=85682 (Worthy challenge) > > is this tcp sequence prediction really an security issue ? **YES** Do a search for the Mitnick attack on Tsutomu Shimomura. It was possible because of the ability to predict the TCP sequence numbers. -- -- David (obrien@FreeBSD.org) GNU is Not Unix / Linux Is Not UniX To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message