wu-ftpd attack ???

From: Aaron D. Lewis (aaron@jsw4.net)
Date: 11/25/02

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From: "Aaron D. Lewis" <aaron@jsw4.net>
To: <incidents@securityfocus.com>

    I'm experiencing a situation where wu-ftpd wu-ftpd-2.6.1-20 on Red Hat 7.2 2.4.18-18.7.x is getting broken by some specific type of scan (I think). When this happens, wu-ftpd just stops responding to connection requests but port 21 is still listening according to netstat -anl. I restart xinetd and all is well.

    Now, what I have managed to catch in the logs, just before the server stops, are several connections (or a scan) from a specific IP address to multiple virt hosts on my server. There is NO annon ftp and there are NO shell accounts. If someone is interested in the tcp dump for the FTP traffic during this, let me know. Other than that there is nothing suspicious in the logs.

    Can someone tell me what might be going on please...

    Aaron Lewis
    JSW4.NET
    aaron@jsw4.net

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