Hello

Am 21.08.20 um 09:53 schrieb Lucio Chiappetti:
> I am maintaining a list on mailman 2.1.18 on a server I have no control
> (actually it is some 1000's km from here). The list is absolutely
> closed, reserved to a committee with a small membership which is
> updated, if any, every severl years.
> 
> In the last days the list is receiving subscription requests from odd
> addresses, apparently in couples. When I found two of them yesterday, I
> rejected them with a notice "list usage reserved ....". Today I found a
> mail announcing two further requests, and when I entered the
> administrative interface found two more.
> 
> I would like to close completely the list from subscription requests (so
> that they can be inserted only by the administrators).
> 
> I thought to set   ban_list ^.*@.*
> 
> Is there any other better option ?
> Will the ban_list interfere with existing subscriptions ?
> 

This is a known attack wave, running since 2 days now.
Where Skripts use the web interface to subscribe a lot of email addresses.

I do not know how to disable the subscription page altogether.
I assume Mark will comment on that :-)

We are mitigating this by:
* subscription requires admin to agree
* Hardening web interface with settings in mm_cfg.py:
  SUBSCRIBE_FORM_SECRET
  SUBSCRIBE_FORM_MIN_TIME
  BLOCK_SPAMHAUS_LISTED_IP_SUBSCRIBE
  BLOCK_SPAMHAUS_LISTED_DBL_SUBSCRIBE
  RECAPTCHA_SITE_KEY
  RECAPTCHA_SECRET_KEY


Kind regards,
Christian Mack
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