full-disclosure - Re: [FD] OpenSSH keyboard-interactive authentication brute force vulnerability (MaxAuthTries bypass)

Open Source and information security mailing list archives

Date: Mon, 20 Jul 2015 10:24:08 +0200
From: Dirk-Willem van Gulik <dirkx@...weaving.org>
To: Reed Loden <reed@...dloden.com>
Cc: "fulldisclosure@...lists.org" <fulldisclosure@...lists.org>
Subject: Re: [FD] OpenSSH keyboard-interactive authentication brute force
	vulnerability (MaxAuthTries bypass)

> On 18 Jul 2015, at 23:23, Reed Loden <reed@...dloden.com> wrote:
> 
> On Friday, July 17, 2015, <devel@...soft.ltd.uk> wrote:
> 
>> Do you know if this is still affected if you have fail2ban in place.
>> Fail2ban uses the auth logs to monitor failed password attempts. I
>> assume that the auth log is still updated even if x number of attempts
>> is allowed. Thanks
> 
> 
> 
> http://www.reddit.com/r/netsec/comments/3dnzcq/openssh_keyboardinteractive_authentication_brute/ct726ni
> goes over this question pretty well, so as not to rehash everything.

Arguably the question then should be to have a MaxChallengeTries as an analog of MaxAuthTries - and perhaps by default
set MaxChallengeTries to the same (sane) value of MaxAuthTries.

Dw.

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