Date: Tue, 12 Jan 1999 12:30:14 -0800 (PST) From: "Brian W. Buchanan" <brian@CSUA.Berkeley.EDU> To: "Jan B. Koum " <jkb@best.com> Cc: Patrick Barmentlo <pbm@gateway.barmentlo.net>, security@FreeBSD.ORG Subject: Re: examples rules ipfw Message-ID: <Pine.BSF.4.05.9901121227000.11885-100000@smarter.than.nu> In-Reply-To: <19990112042358.C303@best.com>
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On Tue, 12 Jan 1999, Jan B. Koum wrote: > [redirect from -hackers to -security] > > On Mon, Jan 11, 1999 at 02:56:44PM -0800, "Brian W. Buchanan" <brian@CSUA.Berkeley.EDU> wrote: > > On Mon, 11 Jan 1999, Patrick Barmentlo wrote: > > > > > Can someone please point me out to some good examples for the rc.firewall > > > file (ipfw )?? > > > (with most variant of opties/features...) > > > > > > i have to set up some filtering, but still having some difficulties with > > > it after checking freebsd.org.... > > > > > > add 00501 allow tcp from any to smarter 1024-65535 > > > > This allows all traffic to ports 1024 through 65535 (to let FTP work > > correctly) > > > This is not good! There are way MANY evil things running on ports > greater then 1024. Take X windows (6000), take nfsd (2049). Most of > the insecure solaris rpc crap runs in that range. This list could > go on forever. Well, I have nfsd listening for UDP only, and that's firewalled off earlier; I selectively unfirewall hosts for NFS as a specific need arises. I don't actually have anything running in the 1024+ port range except X11, and you're right, I should firewall that, but otherwise this doesn't introduce any security vulnerabilities into my particular system. For a network firewall, though, that is dangerous, and I agree that passive FTP is the way to go. -- Brian Buchanan brian@CSUA.Berkeley.EDU -------------------------------------------------------------------------- FreeBSD - The Power to Serve! http://www.freebsd.org daemon(n): 1. an attendant power or spirit : GENIUS 2. the cute little mascot of the FreeBSD operating system To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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