Firewall Wizards mailing list archives
Re: terminal services
From: Barney Wolff <barney () pit databus com>
Date: Tue, 28 Jan 2003 19:35:53 -0500
On Tue, Jan 28, 2003 at 06:56:21PM -0500, Paul D. Robertson wrote:
(UDP 1434) It's an ephemeral port- just blocking it may make random stuff not work in some situations (like say DNS...)
Any network without a state-keeping firewall between it and the Internet really needs to have just one or two DNS cacheing proxies doing requests from port 53, ditto NTP, and block all other UDP. Anything else is just too dangerous, not by a little, but by a whole lot. This worm sent from random source ports, but the next one will surely send from 53 or 123, and all the folks who have allow any 53 to any rules will get hit. Together with the folks who have allow any 20 to any. Some things just can't be done safely without state, so if you need to do them, you need to keep state. -- Barney Wolff http://www.databus.com/bwresume.pdf I'm available by contract or FT, in the NYC metro area or via the 'Net. _______________________________________________ firewall-wizards mailing list firewall-wizards () honor icsalabs com http://honor.icsalabs.com/mailman/listinfo/firewall-wizards
Current thread:
- Re: terminal services, (continued)
- Re: terminal services Don Kendrick (Jan 28)
- Re: terminal services Paul D. Robertson (Jan 28)
- Re: terminal services David Lang (Jan 28)
- Re: terminal services Duncan Sharp (Jan 28)
- Re: terminal services Paul D. Robertson (Jan 28)
- RE: terminal services Noonan, Wesley (Jan 28)
- Re: terminal services Steven M. Bellovin (Jan 28)
- RE: terminal services Noonan, Wesley (Jan 28)
- RE: terminal services R. DuFresne (Jan 28)
- RE: terminal services Paul D. Robertson (Jan 28)
- Re: terminal services Barney Wolff (Jan 28)
- RE: firewall design (was: RE: terminal services ) m p (Jan 29)
- RE: terminal services R. DuFresne (Jan 28)
- RE: terminal services Paul D. Robertson (Jan 28)
- RE: terminal services R. DuFresne (Jan 28)
- Message not available
- RE: terminal services Marcus J. Ranum (Jan 28)
- Re: terminal services Barney Wolff (Jan 29)
- Re: terminal services Paul Robertson (Jan 29)
- Re: terminal services Barney Wolff (Jan 30)