Don't know if it is just me. But over the last 10 hours we have been seeing attacks on port 0 from port 0 (both tcp and udp) on several clients networks. I have also seen the same attack on port udp 53(DNS). Anyone have any information on this? Todd R. Stroup Fiber Network Solutions, Inc.

---------- Forwarded message ---------- Date: Mon, 1 Jun 1998 21:58:17 -0500 From: "J.A. Terranson" <sysadmin@MFN.ORG> To: BUGTRAQ@NETSPACE.ORG Subject: (Admittedly Premature) Exploit (?) Warning.

While I realize that this issue may not yet be "ripe", as I the folks involved (myself and at least three other sites) have not yet firmly established just *exactly* what is going on here, but...

There appears to be some kind of exploit making the rounds that utilizes TCP packets from port "0" (yes, that's *zero*) to the IMAP port, 143. These packet traces are right now available only as historical log entries that are *loosely* associated with 2 successful "root" attacks against IMAP enabled servers, an unsuccessful attack against another (ours), and the possible compromise of another.

In short, I dont know a lot, other than in the course of reviewing my daily logs, I saw a couple of freaky packets (above) addressed to my nameservers (both of them). They were rejected and logged at the routers, however, as a common courtesy, we notified the admin of the "sending" machine that they had a sick box. As it developed, this person had recieved other emails regarding this from other admins, 2 of which had suffered the successful attacks mentioned above - all of us seeing the originating machine as the same box. It is unknown if the source address was spoofed.

Basically, I think this is just a "common-cause" warning to look out for weird packets of this nature, and to take notice if you see any.

Rather than keep a running blow-by-blow going on the various lists, please address anything regarding this to me directly...

Thanks J.A. Terranson sysadmin@mfn.org