full-disclosure - TCP port 25 traffic?

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From: josh.karp at visionael.com (Josh Karp)
Subject: TCP port 25 traffic?

Alright, sorry for the lack of info in my original post. 

I'm not running a mail server anywhere on my network. I don't have TCP 25
open to anywhere. 

What I'm seeing lately is a huge increase in SMTP probes and I'm wondering
if there's something new out in the wild for SMTP. 

Thanks again... josh

-----Original Message-----
From: Joel R. Helgeson [mailto:joel@...geson.com] 
Sent: Saturday, August 16, 2003 10:15 PM
To: full-disclosure@...ts.netsys.com
Subject: Re: [Full-Disclosure] TCP port 25 traffic?

Yeah, I think its called SPAM, not new though....
Try connecting to your server via telnet on port 25 and see if you can get
an interactive connection.

type in the following commands:
expn
vrfy

and see if they are accepted.  If so, your server is open to possible
attack.

telnet://192.168.0.1:25 <telnet://192.168.0.1:25>  will open a telnet
session to your server on port 25

Joel R. Helgeson
Director of Networking & Security Services
SymetriQ Corporation

"Give a man fire, and he'll be warm for a day; set a man on fire, and he'll
be warm for the rest of his life." 
----- Original Message ----- 
From: Josh Karp <mailto:josh.karp@...ionael.com>  
To: 'full-disclosure@...ts.netsys.com'
<mailto:'full-disclosure@...ts.netsys.com'>  
Sent: Saturday, August 16, 2003 5:45 PM
Subject: [Full-Disclosure] TCP port 25 traffic?

I've seen an unusual amount of connection attempts to TCP port 25 on a
particular system in my network as of the past 48 hours or so. It's only
this one system, and it's multiple source IP's. Is there anything new for
SMTP? 
Thanks for any info... josh 
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