From owner-freebsd-security Thu Mar 28 7: 4: 9 2002 Delivered-To: freebsd-security@freebsd.org Received: from gw.nectar.cc (gw.nectar.cc [208.42.49.153]) by hub.freebsd.org (Postfix) with ESMTP id 3C1E237B431 for ; Thu, 28 Mar 2002 07:03:28 -0800 (PST) Received: from madman.nectar.cc (madman.nectar.cc [10.0.1.111]) by gw.nectar.cc (Postfix) with ESMTP id CBF6154; Thu, 28 Mar 2002 09:03:25 -0600 (CST) Received: (from nectar@localhost) by madman.nectar.cc (8.11.6/8.11.6) id g2SF3PI01845; Thu, 28 Mar 2002 09:03:25 -0600 (CST) (envelope-from nectar) Date: Thu, 28 Mar 2002 09:03:25 -0600 From: "Jacques A. Vidrine" To: Brett Glass Cc: security@FreeBSD.ORG Subject: Re: Is FreeBSD susceptible to this vulnerability? Message-ID: <20020328150325.GB1421@madman.nectar.cc> References: <4.3.2.7.2.20020328072932.03228b20@nospam.lariat.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4.3.2.7.2.20020328072932.03228b20@nospam.lariat.org> User-Agent: Mutt/1.3.27i X-Url: http://www.nectar.cc/ Sender: owner-freebsd-security@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org On Thu, Mar 28, 2002 at 07:31:03AM -0700, Brett Glass wrote: > Apparently, several UNIX-like operating systems can be penetrated via > XDMCP/UDP; see > > http://www.procheckup.com/security_info/vuln_pr0208.html > > Is FreeBSD vulnerable? What about the other BSDs? No, and this isn't exactly a `vulnerability'. It is an insecure default configuration. This ``advisory'' is mostly a marketing ploy for this ProCheckUp tool. This is ancient issue. I really don't get their `Comment' --- this has been an administration issue since XDMCP existed (decades). You can find your `Xaccess' file in /etc/X11/xdm/Xaccess or /usr/X11R6/lib/X11/xdm/Xaccess. By default, XFree86 does not allow remote hosts. Of course, this only applies if you are running xdm. You have to turn xdm on yourself --- it is not on by default. Note that wdm, gdm, and kdm have their own Xaccess files (IIRC), and these have to be checked also if you are running them (duh). Cheers, -- Jacques A. Vidrine http://www.nectar.cc/ NTT/Verio SME . FreeBSD UNIX . Heimdal Kerberos jvidrine@verio.net . nectar@FreeBSD.org . nectar@kth.se To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message