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Re: OpenSSH/PAM timing attack allows remote users identification
From: Marco Ivaldi (raptor
mediaservice.net)
Date: Mon May 05 2003 - 07:55:51 CDT
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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 roothost
> roothost's password: <- arbitrary (non-null) string
> [2 secs delay]
> Permission denied, please try again.a
>
> $ ssh roothost
> roothost'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/
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