Re: [Exim] Exim DoS - Delaying system performance / system c…

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著者: Philip Hazel
日付:  
To: Chris Knipe
CC: exim-users, bugtraq
題目: Re: [Exim] Exim DoS - Delaying system performance / system crash.
On Tue, 4 Jan 2000, Chris Knipe wrote:

> For the first time since I have been using the popular Exim mailer daemon,
> I have come accross an possible (and fairly serious) DoS.


I have not the time to read your code, but a quick glance suggests that
you are just hammering the victim with many SMTP calls. Exim can be
protected against such an attack by setting smtp_accept_max and
smtp_max_per_host.


-- 
Philip Hazel            University of Cambridge Computing Service,
ph10@???      Cambridge, England. Phone: +44 1223 334714.