Hello all,
this looks like someone may have a broken mail server. It's also
possible, though not probable, that they have been "hacked". I would
recommend calling their coordinator:
Jeff Fostek ([EMAIL PROTECTED])
or by phone at 757-490-7300 (US Number)
This information is publicly available through the whois service. You
might want to include an e-mail to the coordinator with a sample of the
logs.
Hope this helps,
Mark.
P.S. The other message on this thread was an active monitor status
checking mechanism on the Qube/Raq. It checks the status of various
applications every 15 minutes and alerts the admin if the application is
not on-line.
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]] On Behalf Of Michael
Stauber
Sent: Wednesday, December 12, 2001 9:54 AM
To: [EMAIL PROTECTED]
Subject: Re: [cobalt-security] Should I worry
Hi Audric,
> During the last few days I got hundreds of these:
>
> Dec 12 09:04:08 qube3 sendmail[20950]: NOQUEUE: mrh.rcmail.com
> [216.54.1.19] did not issue MAIL/EXPN/VRFY/ETRN during connection to
> MTA
>
> should I worry.
Jepp. Could be that someone connected manually to your sendmail port and
is/was trying to trick it into doing bad stuff.
You can test it out by using "telnet <your.ip.address> 25". Sendmail
will then greet you and expects to talk to a mail programm or other mail
server. You can basically send emails that way by just typing the
commands that Sendmail expects during a normal mail connection, or by
letting a script generate them.
The error message above (did not issue MAIL/EXPN/VRFY/ETRN) tells us
that the connecting party got past the initial "HELO" greeting, but then
didn't behave as sendmail expected.
> Meanwhile I changed the default rule of my firewall from accept to
> deny.
Sounds like a good idea. You could of course block this IP-address or
the entire address range of the originating ISP instead.
--
With best regards,
Michael Stauber
SOLARSPEED.NET
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