[secdir] [http-auth] secdir review of draft-ietf-httpauth-basicauth-update-06 -- security considerations on timing/guessing attacks
Julian Reschke <julian.reschke@gmx.de> Fri, 20 February 2015 14:01 UTC
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Date: Fri, 20 Feb 2015 15:00:25 +0100
From: Julian Reschke <julian.reschke@gmx.de>
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To: Daniel Kahn Gillmor <dkg@fifthhorseman.net>, http-auth@ietf.org
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Cc: secdir@ietf.org, Julian Reschke <julian.reschke@gmx.de>, "Roy T. Fielding" <fielding@gbiv.com>, "http-auth@ietf.org" <http-auth@ietf.org>, iesg@ietf.org, draft-ietf-httpauth-basicauth-update.all@tools.ietf.org
Subject: [secdir] [http-auth] secdir review of draft-ietf-httpauth-basicauth-update-06 -- security considerations on timing/guessing attacks
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On 2015-02-20 01:10, Roy T. Fielding wrote: > ... >>> A more reasonable thing to say is that any authentication system that >>> allows a client to perform more than three failed authentication attempts >>> on a single connection, or more than ten on a single account over multiple >>> connections, is likely to be vulnerable to password guessing attacks. >>> Timing attacks then become completely irrelevant. >> >> This is an interesting suggestion, and should be useful against more >> than just timing attacks. How should that filter be applied? It seems >> like it could create some sort of denial of service attack vector if >> it's not done judiciously (e.g. Alice tries to lock out Bob by faking >> bad logins from Bob). > > Yes, what I've seen is typically implemented as a temporary lock-out > on the order of minutes -- long enough to prevent iterative attack > techniques, but short enough that a user wouldn't mind. It is also > sometimes combined with an alert to the user. How to implement it > correctly depends on the overall web server architecture, such as > whether the block is only per-server or covers an entire domain. > > I don't think we need to describe specifically how to implement it. > ... As this advice applies is not specific to Basic: how about putting this on our TODO list for RFC 7235bis? Best regards, Julian
- [secdir] secdir review of draft-ietf-httpauth-bas… Daniel Kahn Gillmor
- Re: [secdir] secdir review of draft-ietf-httpauth… Julian Reschke
- Re: [secdir] secdir review of draft-ietf-httpauth… Julian Reschke
- Re: [secdir] secdir review of draft-ietf-httpauth… Daniel Kahn Gillmor
- Re: [secdir] secdir review of draft-ietf-httpauth… Julian Reschke
- Re: [secdir] secdir review of draft-ietf-httpauth… Daniel Kahn Gillmor
- Re: [secdir] secdir review of draft-ietf-httpauth… Julian Reschke
- Re: [secdir] [http-auth] secdir review of draft-i… Bjoern Hoehrmann
- Re: [secdir] [http-auth] secdir review of draft-i… Kathleen Moriarty
- Re: [secdir] [http-auth] secdir review of draft-i… Kathleen Moriarty
- Re: [secdir] [http-auth] secdir review of draft-i… Roy T. Fielding
- Re: [secdir] [http-auth] secdir review of draft-i… Daniel Kahn Gillmor
- Re: [secdir] [http-auth] secdir review of draft-i… Roy T. Fielding
- Re: [secdir] secdir review of draft-ietf-httpauth… Julian Reschke
- [secdir] secdir review of draft-ietf-httpauth-bas… Julian Reschke
- [secdir] [http-auth] secdir review of draft-ietf-… Julian Reschke
- Re: [secdir] secdir review of draft-ietf-httpauth… Julian Reschke