BugTraq
OpenSSH/PAM timing attack allows remote users identification Apr 30 2003 02:34PM
Marco Ivaldi (raptor mediaservice net) (4 replies)
Re: OpenSSH/PAM timing attack allows remote users identification May 02 2003 01:15PM
Michael Shigorin (mike osdn org ua) (1 replies)
Re: OpenSSH/PAM timing attack allows remote users identification May 02 2003 01:48PM
Marco Ivaldi (raptor mediaservice net)
Re: OpenSSH/PAM timing attack allows remote users identification May 02 2003 12:56AM
Karl-Heinz Haag (k haag linux-ag com)
Re: OpenSSH/PAM timing attack allows remote users identification May 01 2003 03:20PM
Thilo Schulz (arny ats s bawue de) (1 replies)
Re: OpenSSH/PAM timing attack allows remote users identification May 02 2003 11:20AM
Marco Ivaldi (raptor mediaservice net)
Re: OpenSSH/PAM timing attack allows remote users identification May 01 2003 09:12AM
Ethan Benson (erbenson alaska net) (2 replies)
Re: OpenSSH/PAM timing attack allows remote users identification May 05 2003 12:55PM
Marco Ivaldi (raptor mediaservice net)
On Thu, 1 May 2003, Ethan Benson wrote:

> ive noticed something similar in its handling of PermitRootLogin, if
> this option is set to `no' you get the following behavior:
>
> $ ssh root@host
> root@host's password: <- arbitrary (non-null) string
> [2 secs delay]
> Permission denied, please try again.a
>
> $ ssh root@host
> root@host's password: <- correct root password
> [no delay]
> Permission denied, please try again.
>
> i haven't checked the current version to see if this is still true.

It is, also in the latest OpenSSH_3.6.1p2. I'm not sure if this behaviour
has serios security implications, however it can be "fixed" applying the
same workaround suggested for CAN-2003-0190: use the "nodelay" option for
pam_unix.so.

--
Marco Ivaldi
Chief Security Officer Data Security Division
@ Mediaservice.net Srl http://mediaservice.net/

[ reply ]
Re: OpenSSH/PAM timing attack allows remote users identification May 01 2003 06:15PM
Nicolas Couture (nc stormvault net)


 

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