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Re: OpenSSH/PAM timing attack allows remote users identification
From: Ethan Benson (erbenson
alaska.net)
Date: Thu May 01 2003 - 04:12:42 CDT
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On Wed, Apr 30, 2003 at 04:34:27PM +0200, Marco Ivaldi wrote:
> rootvoodoo:~# ssh [valid_user]lab.mediaservice.net
> [valid_user]lab.mediaservice.net's password: <- arbitrary (non-null) string
> [2 secs delay]
> Permission denied, please try again.
>
> rootvoodoo:~# ssh [no_such_user]lab.mediaservice.net
> [no_such_user]lab.mediaservice.net's password: <- arbitrary (non-null) string
> [no delay]
> Permission denied, please try again.
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.
i think you also will get no delay if DenyUsers or so is in use for
accounts your testing.
--
Ethan Benson
http://www.alaska.net/~erbenson/
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