From: Mark Norman (mnormantrading-post.com.au)
Date: Tue Nov 11 2003 - 16:37:46 CST

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I had this happen to me a while ago. The server was locked down, with SP3 installed.

One of my servers has OWA enabled, and someone cracked an account with a weak password.

They then used these credentials to authenticate, and relay mail. Trouble is, the account that was compromised was handed out to dozens of spammers, so I couldn't just block a range of addresses. I had to pin point the account they were using, and disable it.

-----Original Message-----
From: Tom Burns [mailto:tburnstorcausa.com]
Sent: Wednesday, 12 November 2003 1:00 AM
To: focus-mssecurityfocus.com
Subject: Exchange SMTP Hole?

Good morning all,

I have an exchange server that's been running for quite some time (over
a year) and had it locked down to prevent relay (spam). It is patched
all the way up to 3a.

I checked my queues yesterday and got slammed by spam relaying.

Is there a security hole that MS does not know about yet in SMTP?????

The only way I resolved this was to block connection from 219.x.x.x,
218.x.x.x, 211.x.x.x, etc.

This server has been testing aginst ORDB.ORG and shown to NOT be an open
relay.

If anyone has any suggestions, please let me know.

Thomas A. Burns
System Administrator
Torca Products Inc.
Auburn Hills, MI 48326
248-373-8300 x186

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