Faas M. Mathiasen wrote:
> Dear List,
> "We" have noticed a odd traffic pattern emerging from our mail
> servers, an important amount of data left our network over the mail
> server. Please understand "we" would like
> to remain anonymous at this point. We monitored our mail servers for
> availability and the patch level is as to latest specifications,
> additionally we have anti-virus software
> installed on all E-mail servers.
>
> Is anybody aware of an unpatched exploit against Exchange Server 2007 ?
> Is there any other threat we have not taken into consideration ?
>
> Do you have recommendations as to how to proceed ? Obviously our mail
> server hold important information and we can't simply turn them off,
> though we have procedures on how to respond to incidents we don't have
> a procedure for this particular case, as our mail server is inside our
> company, maintained and updated regularly we had no important reason
> to believe it could be compromised.
>
> We are currently investigating and took it off line for a few hours,
> while installing a new clean server.
>
> Regards,
> Faas M. Mathiasen
> CISSP Denmark
>

The most frequent 'exploit' I see against exchange servers is
where users use their business email address and domain login
password to register at some web site and either:
a) that site gets compromised and those credentials revealed, or
b) more likely, someone registered at a pseudo-phishing site
(such as 'all the free porn you can view') using their
exchange credentials.

In either case, the credentials are then used to force the
server to send spam, or if the credentials have admin priv, then
mangle the server in any way that they please.

Regardless of what happened, the best advise I can give is to
IMMEDIATELY change ALL user email passwords, and if any were
the same as domain passwords, change those too!

GOOD LUCK!
Jon Kibler
--
Jon R. Kibler
Chief Technical Officer
Advanced Systems Engineering Technology, Inc.
Charleston, SC USA
o: 843-849-8214
m: 843-224-2494

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