nanog mailing list archives
Re: ABOVE.NET SECURITY TRUTHS?
From: Hank Nussbacher <hank () att net il>
Date: Sun, 30 Apr 2000 09:27:17 +0200
At 15:06 28/04/00 -0600, Alec H. Peterson wrote:
Paul Froutan wrote:I don't think you can. However, I use TACACS on all my switches and routers. From what I know, TACACS passwords are encrypted using the key on your network devices and the TACACS server. So, that, in combination with a private management LAN not accessible by your customers should lock down your network pretty effectively. Any comments?Using TACACS+ with some sort of one-time-passwording works very well.
TACACS encryption won't help if you follow the Cisco Essential IOS Features (v 2.82 - Feb 18, 2000). On page 45 they discuss router command auditing and recommend: aaa accounting command 15 start-stop tacacs+ Unfortunately, this will log in your syslog the password commands in cleartext. You would have to be sure that the Unix/NT system you are logging all Cisco commands to is as secure as your router. How many of you run ISS/Cybercop/Netrecon scans every week on your logging servers to be sure they are secure? "aaa accounting command 15 start-stop tacacs+" can be considered an unintentional backdoor for many. I informed the Cisco authors when it was published to issue a document patch. -Hank
Alec -- Alec H. Peterson - ahp () hilander com Staff Scientist CenterGate Research Group - http://www.centergate.com "Technology so advanced, even _we_ don't understand it!"
Current thread:
- ABOVE.NET SECURITY TRUTHS? Exiled Dave (Apr 28)
- <Possible follow-ups>
- Re: ABOVE.NET SECURITY TRUTHS? Exiled Dave (Apr 28)
- Re: ABOVE.NET SECURITY TRUTHS? Exiled Dave (Apr 28)
- RE: ABOVE.NET SECURITY TRUTHS? Roeland Meyer (E-mail) (Apr 28)
- RE: ABOVE.NET SECURITY TRUTHS? Paul Froutan (Apr 28)
- Re: ABOVE.NET SECURITY TRUTHS? Alec H. Peterson (Apr 28)
- Re: ABOVE.NET SECURITY TRUTHS? Travis Pugh (Apr 28)
- Re: ABOVE.NET SECURITY TRUTHS? Hank Nussbacher (Apr 29)
- Re: ABOVE.NET SECURITY TRUTHS? Alec H. Peterson (Apr 30)
- Re: ABOVE.NET SECURITY TRUTHS? Philip Smith (Apr 30)
- RE: ABOVE.NET SECURITY TRUTHS? Roeland Meyer (E-mail) (Apr 28)
- Re: ABOVE.NET SECURITY TRUTHS? John Kristoff (Apr 28)
- Re: ABOVE.NET SECURITY TRUTHS? Joe Shaw (Apr 30)
- RE: ABOVE.NET SECURITY TRUTHS? Mr. James W. Laferriere (Apr 28)
- RE: ABOVE.NET SECURITY TRUTHS? Chris Cappuccio (Apr 28)