From owner-freebsd-security Fri Jan 21 13:23:59 2000 Delivered-To: freebsd-security@freebsd.org Received: from lariat.lariat.org (lariat.lariat.org [206.100.185.2]) by hub.freebsd.org (Postfix) with ESMTP id E3FE71527D for ; Fri, 21 Jan 2000 13:23:55 -0800 (PST) (envelope-from brett@lariat.org) Received: from workhorse (IDENT:ppp0.lariat.org@lariat.lariat.org [206.100.185.2]) by lariat.lariat.org (8.9.3/8.9.3) with ESMTP id OAA23915; Fri, 21 Jan 2000 14:23:49 -0700 (MST) Message-Id: <4.2.2.20000121141918.01a54ef0@localhost> X-Sender: brett@localhost X-Mailer: QUALCOMM Windows Eudora Pro Version 4.2.2 Date: Fri, 21 Jan 2000 14:23:47 -0700 To: Gene Harris From: Brett Glass Subject: Re: Some observations on stream.c and streamnt.c Cc: freebsd-security@freebsd.org In-Reply-To: References: <4.2.2.20000120194543.019a8d50@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: owner-freebsd-security@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org At 02:18 PM 1/21/2000 , Gene Harris wrote: >After eight hours of testing, in which I have been >bombarding the NT 4.0 SP6a Server, the CPU usage on an >unloaded machine jumped to 27%. However, when I started up >Oracle 8.05 and ran a rather lengthy query against a 400MB >database, no distinguishable differences exist in the query >time between a machine under attack and one not under >attack. A poor test, IMHO. It's disk-intensive and CPU-intensive, but not network-intensive. Also, other conditions can affect the results. Were the machines on a network with a live gateway router? Remember, traffic to, from, and through the router is significant, since one of the effects of the exploit is to cause a storm of packets on the local LAN. I've made an NT/IIS server virtually inaccessible using the same exploit. >In the case of Windows 95/98, several more complex >interactions occured, and my FreeBSD machine began to post >jess: No more buffer errors. I tested the Win98/95 machines >against read/writes against the IDE and reads against the >DVD subsystems and no apparent performance loss was noticed >when the machines were under attack. (I used the movie "Gone >With the Wind" as a test on the DVD drive.) Again, a bad test -- I/O and CPU intensive, but not network- intensive. The same seems to be true of the Linux and BSD tests you describe. --Brett To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message