Re: [exim] Exim (aoom) named in context of new TLS cross-pro…

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Συντάκτης: Heiko Schlittermann
Προς: exim-users
Αντικείμενο: Re: [exim] Exim (aoom) named in context of new TLS cross-protocol attack
Cyborg via Exim-users <exim-users@???> (Mi 09 Jun 2021 21:13:43 CEST):
> Don#t get me wrong, exim is at the top of this "best of the worse" list,
> because it stops after 3 retriesm but other server like proftpd have already
> reacted to this by implementing countermeasures. This can also be seen in
> the mentioned figure.

The "3" is configurable:

|smtp_max_synprot_errors|Use: main|Type: integer|Default: 3|

So, if you worry about the abuse of your bandwidth and your Exim server,
then set this to zero. Should be enough to not be a part of this attack
vector, shouldn't it?

    Best regards from Dresden/Germany
    Viele Grüße aus Dresden
    Heiko Schlittermann
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