MJ Ray: Crackers: Evil Mambots and a com_extcalendar exploit
A couple of hours of today went on dealing
with the effects of a big spam attack on a
managed server.
One user had installed the Joomla
ExtCal component on their web site,
while another reported that email was
running slowly.
The attacker was exploiting
com_extcalendar/admin_events.php to send spam
and trying to send 9000 emails meant
they hit the maximum permitted sending
rate quite quickly.
As soon as I spotted it,
I shut down outgoing mail, killed the sending
process, disabled the exploited site and
component, cleaned the spam from the queue
and restarted mail.
I'm searching the rest of the server
for any other com_extcalendar installations
and then I should contact the other exploited
servers I've seen during this attack.
It looks like there's
an entire class of evil "Mambots" out there,
using exploitable Mambo and Joomla sites
to crawl in search of others.
I don't think the exploited site's owner
will be billed for the clean-up,
because I can't find a security advisory
for this.
Neither
the mambo site
(whose site search doesn't work for me)
nor
the joomla site
seems clear about security alerts.
I didn't find a third-party advisory that
was clearly about this (but there were a few
maybe-relevant ones).
The homepage at Mambo
last released in 2005 and
doesn't mention this in its release notes,
while
the homepage listed by Joomla
404s (and I don't enjoy using the Joomla site because,
as it says,
"we are aware, and regret, that our website does not comply with many WCAG/508 requirements"). If you are using com_extcalendar on your site, check whether it's safe, or replace it with a better calendar.