[Mailman-Users] Mailman under attack

[Fil]

Hello,

I just noticed a lot of backscatter spam, my Mailman installation was
starting to send subscription verifications to a lot of
ALLCAPS at hotmail.comaddresses, on a test list that no one is supposed
to be using.

I traced it to this site :

http://4478.a.hostable.me/vinabot/bommail/Boom.html

if you view source you will see that it opens a lot of iframes on 284
Mailman installations, and tries to auto-subscribe its victims email
adresses to different lists (392 in total).

I have put the page HTML source as well as the list of targeted servers and
lists in the attached zip file.

Do you know how to stop this efficiently?

-- Fil