Re: Secure OWA

["Bardus Populus" <disclosure () wykkyd securecoffee com>]

Running an active event log monitor (Symantec's ITA comes to mind as a
quick example) will catch both the brute forcer and/or the lockouts
(regardless of which way you set it up - to lock or not) - and respond
with some appropriate action to notify you as to the happenstance rather
than wait for an admin to review the logs (n)ever.

(bp)


> On 8/30/06, Renshaw, Rick (C.) <rrenshaw () ford com> wrote:
> > -----Original Message-----
> > From: full-disclosure-bounces () lists grok org uk
> > [mailto:full-disclosure-bounces () lists grok org uk] On Behalf Of Dude
> > VanWinkle
> > Sent: Saturday, August 26, 2006 2:30 PM
> > To: Adriel Desautels
> > Cc: full-disclosure () lists grok org uk
> > Subject: Re: [Full-disclosure] Secure OWA
> >
> > > The only real fault I know about is the fact that you can guess
> > passwords
> > eternally without locking out user accounts.
> >
> > There's two sides to this risk.  If you allow OWA logins to lock out
> > accounts, and your OWA page is available from anywhere on the Internet,
> > you
> > are handing an easy DOS tool to anyone that knows the account names for
> > people on your server.
>
> Perhaps. But a temporary lockout period would deter brute-force
> attempts while still making an attacker do some work to keep the
> accounts locked (eg, if you have a lockout of 5 minutes, brute forcing
> is no longer practical, but at the same time, if you want to DoS
> someone's account you have to keep coming back every 5 minutes. And
> that increases the risk you'll get caught.)
>
> -Brendan
>
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