From owner-freebsd-security@FreeBSD.ORG  Thu Feb 26 02:14:50 2004
Return-Path: <owner-freebsd-security@FreeBSD.ORG>
Delivered-To: freebsd-security@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id 6A28E16A4CE; Thu, 26 Feb 2004 02:14:50 -0800 (PST)
Received: from smtp.des.no (flood.des.no [217.116.83.31])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id EE2F643D2F; Thu, 26 Feb 2004 02:14:49 -0800 (PST)
	(envelope-from des@des.no)
Received: by smtp.des.no (Pony Express, from userid 666)
	id 902BE5309; Thu, 26 Feb 2004 11:14:48 +0100 (CET)
Received: from dwp.des.no (des.no [80.203.228.37])
	by smtp.des.no (Pony Express) with ESMTP
	id 7B5B95308; Thu, 26 Feb 2004 11:14:41 +0100 (CET)
Received: by dwp.des.no (Postfix, from userid 2602)
	id 0510733C71; Thu, 26 Feb 2004 11:14:40 +0100 (CET)
To: kientzle@acm.org
References: <403CEF67.5040004@kientzle.com>
From: des@des.no (Dag-Erling =?iso-8859-1?q?Sm=F8rgrav?=)
Date: Thu, 26 Feb 2004 11:14:40 +0100
In-Reply-To: <403CEF67.5040004@kientzle.com> (Tim Kientzle's message of
 "Wed, 25 Feb 2004 10:54:31 -0800")
Message-ID: <xzpwu6a171r.fsf@dwp.des.no>
User-Agent: Gnus/5.090024 (Oort Gnus v0.24) Emacs/21.3 (berkeley-unix)
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: quoted-printable
X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on flood.des.no
X-Spam-Level: 
X-Spam-Status: No, hits=0.0 required=5.0 tests=AWL autolearn=no version=2.63
cc: freebsd-security@freebsd.org
cc: das@freebsd.org
Subject: Re: Environment Poisoning and login -p
X-BeenThere: freebsd-security@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Security issues [members-only posting]
	<freebsd-security.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-security>,
	<mailto:freebsd-security-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-security>
List-Post: <mailto:freebsd-security@freebsd.org>
List-Help: <mailto:freebsd-security-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-security>,
	<mailto:freebsd-security-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 26 Feb 2004 10:14:50 -0000

Tim Kientzle <tim@kientzle.com> writes:
> There's been an ongoing discussion (started by
> Colin Percival's recent work on nologin) about
> environment-poisoning attacks via "login -p".
> [...]

You missed the obvious solution: remove login(1)'s setuid bit so it
only works if you are already root.

DES
--=20
Dag-Erling Sm=F8rgrav - des@des.no