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Date: Sun, 15 May 2005 13:13:53 -0400 (EDT)
From: "Jerry Bell" <jbell@stelesys.com>
To: "Kevin Pang" <kevin@vokaboly.de>
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> web script. The sender was specified as "www@myhost.com" according to the
> complaint email. I use phpBB, vBulletin and Awstats.

Most likely the attacker used a flaw in phpBB or awstats.  Are you running
the latest versions of those?  Otherwise, it is possible they found a
vulnerability in something else you were running, like apache, php, etc.

Jerry
http://www.syslog.org