From owner-freebsd-security Fri Mar 16 12:48:15 2001 Delivered-To: freebsd-security@freebsd.org Received: from obsecurity.dyndns.org (adsl-63-207-60-202.dsl.lsan03.pacbell.net [63.207.60.202]) by hub.freebsd.org (Postfix) with ESMTP id 268BD37B71A for ; Fri, 16 Mar 2001 12:48:12 -0800 (PST) (envelope-from kris@obsecurity.org) Received: by obsecurity.dyndns.org (Postfix, from userid 1000) id 7A22C66B25; Fri, 16 Mar 2001 12:48:08 -0800 (PST) Date: Fri, 16 Mar 2001 12:48:08 -0800 From: Kris Kennaway To: Ron 'The InSaNe One' Rosson Cc: freeBSD-security@freeBSD.org Subject: Re: Multiple vendors FTP denial of service (fwd) Message-ID: <20010316124808.B98989@mollari.cthul.hu> References: <98righ$100l$1@FreeBSD.csie.NCTU.edu.tw> <004b01c0ada9$99f7b540$db9497cf@singingtree.com> <20010315215913.A70990@mollari.cthul.hu> <20010316071511.A46313@lunatic.oneinsane.net> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-md5; protocol="application/pgp-signature"; boundary="Fba/0zbH8Xs+Fj9o" Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <20010316071511.A46313@lunatic.oneinsane.net>; from insane@lunatic.oneinsane.net on Fri, Mar 16, 2001 at 07:15:12AM -0800 Sender: owner-freebsd-security@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org --Fba/0zbH8Xs+Fj9o Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Mar 16, 2001 at 07:15:12AM -0800, Ron 'The InSaNe One' Rosson wrote: > Kris Kennaway (kris@obsecurity.org) wrote: > > On Thu, Mar 15, 2001 at 03:42:29PM -0800, Michael A. Dickerson wrote: > > > > 4.1 from Aug 10th is hurt by it. > > > > > > > > ---Mike > > > > > > >=20 > > > So is 4.3-beta (otherwise known as 4-stable) from March 8. ftpd uses= 100% > > > cpu and memory use grows until the kernel runs out of swap space and = starts > > > killing processes. This was an ftp connection with a regular usernam= e and > > > password, in an average home directory. > >=20 > > I'm pretty sure (but haven't tested) that resource limits will prevent > > this problem. Your ftpd shouldn't be using large amount of memory > > under normal operating procedures, so you can set those to reasonable > > values and not suffer any ill effects. > >=20 > > Kris >=20 > But, by default are the resource limits set properly to avoid this out > of the box? Or does one have to make the mod themselves. You have to tune resource limits as appropriate for your local operating environment. Kris --Fba/0zbH8Xs+Fj9o Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.4 (FreeBSD) Comment: For info see http://www.gnupg.org iD8DBQE6snwHWry0BWjoQKURAo1XAJ41taxJNIk40WyL0E75yWDW06DPTACfZovh gbB3L8KuAEgdoNeNgqI74hA= =rrM9 -----END PGP SIGNATURE----- --Fba/0zbH8Xs+Fj9o-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message