Article View: comp.security.misc
Article #126Re: Limiting reading of passwd to slow logins
From: Ron Heiby
Date: Mon, 10 Aug 1992 19:18
Date: Mon, 10 Aug 1992 19:18
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jfh@rpp386.lonestar.org (John F. Haugh II) writes: >Next, you >must track and account for all authentication failures and turn off >any account (either permanently or for a brief period of time) that >exceeds the allowable number of failed trials. This means that your system is now open to a "denial of service" attack. In other words, although I may not be able to be nasty to you by logging in on your system and accessing your data, I *can* prevent you from doing so by making multiple failed login attempts on your login id. I'm sure that there are ways of mitigating this risk. For example, you might set up your Email system to *always* present *all* address information as first.last@host.dom.ain, while the actual login id used is non-predictable. Some element of "denial of service" risk still remains, though. It should be left to the individual site management as to whether this is a more or less acceptable risk. -- Ron Heiby, heiby@chg.mcd.mot.com Moderator: comp.newprod "The centipede has a thousand legs, but he cannot tapdance."
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arc1-ca.pugleaf.net!sparky!uunet!iWarp.intel.com|ogicse!das-news.harvard.edu!spdcc!dirtydog.ima.isc.com!laidbak!tellab5!mcdchg!heibyReferences:
<1992Aug7.123815.1@vcp1.vcp.monash.edu.au> <21306@rpp386.lonestar.org>Show Full Headers
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Path: arc1-ca.pugleaf.net!sparky!uunet!iWarp.intel.com|ogicse!das-news.harvard.edu!spdcc!dirtydog.ima.isc.com!laidbak!tellab5!mcdchg!heiby From: heiby@chg.mcd.mot.com (Ron Heiby) Newsgroups: comp.security.misc Subject: Re: Limiting reading of passwd to slow logins Message-ID: <1992Aug10.191851.4562@chg.mcd.mot.com> Date: 10 Aug 92 19:18:51 GMT Article-I.D.: chg.1992Aug10.191851.4562 References: <1992Aug7.123815.1@vcp1.vcp.monash.edu.au> <21306@rpp386.lonestar.org> Organization: Motorola Computer Group, Schaumburg, IL Lines: 23