Re: [Full-disclosure] Secure OWA

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@xxxxxxxx> wrote:


-----Original Message-----
From: full-disclosure-bounces@xxxxxxxxxxxxxxxxx
[mailto:full-disclosure-bounces@xxxxxxxxxxxxxxxxx] On Behalf Of Dude
VanWinkle
Sent: Saturday, August 26, 2006 2:30 PM
To: Adriel Desautels
Cc: full-disclosure@xxxxxxxxxxxxxxxxx
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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_______________________________________________
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