Re: [Full-disclosure] OpenSSH - System Account Enumeration if S/Key is used

["Brian Eaton" <eaton.lists@xxxxxxxxx>]

On 4/24/07, Stanislaw Klekot <dozzie@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> Look closer to challenge message. There's salt and key number included.
> Consider now three logins: first isn't valid account on the target
> system, second is valid but without OTP set, and third with OTP set.
> First two are indistinguishable for attacker as in these cases system
> presents random challenge, but for third account system will present the
> same challenge over and over again.
>
> How about that?

Perhaps rather than presenting a random challenge, the challenge could
be based on a hash of the account name used and a per-system salt?

Regards,
Brian

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