Re: Detecting http 'basic-auth' brute force

[Jason Haar <Jason.Haar () trimble co nz>]

On Tue, Mar 23, 2004 at 02:04:07PM -0600, Josh Berry wrote:
> There is no way to do this with single pattern matching rules and no
> threshholding.  The version of Snort you are using does not support
> threshholding, you need to upgrade to Snort 2.0.6 or newer in order to do
> this, then you can add a rule to track the source address trying to login
> for more than X amount of failed attempts.

Indeed. In fact, snort-2.1.1 with thresholds should be quite good at seeing
such things! As long as the threshold is set high enough (a web page with 5
images could conceivably cause 6 auth failures the first time you connect -
so you'd want the threshold to be higher - say 20/sec). A good browser
shouldn't do that - but I can't vouch for IE ;-)

-- 
Cheers

Jason Haar
Information Security Manager, Trimble Navigation Ltd.
Phone: +64 3 9635 377 Fax: +64 3 9635 417
PGP Fingerprint: 7A2E 0407 C9A6 CAF6 2B9F 8422 C063 5EBB FE1D 66D1


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