As you might have noticed we had removed the forum for the last two days.
This was only a precaution
after we noticed on Monday that a worm is spreading.
At that time it was not clear which of the recently discovered vulnerabilites (in PHP and/or phpBB) are being used by the worm.
Yesterday it turned out that the so called Santy worm
uses "only" a hole in phpBB prior to 2.0.11.
We had updated to to this version already on November 18th (the day it was released), so actually the worm wouldn't have been able to cause any harm.
So, we could have already put the forum back online yesterday, but since there is also a serious vulnerability in PHP prior to 4.3.10 which could be used by a modified worm version, we decided to wait until our hoster had updated to the latest version.
That happened in the meantime, so the forum is now back online.
Merry Christmas and a Happy New Year to all of you!