Re: Out of my league.....

[Dani Wuck <wuck () chello nl>]

I suspect I won't be of much help, but:

http://www.iana.org/assignments/port-numbers says:

microsoft-ds    445/tcp    Microsoft-DS
microsoft-ds    445/udp    Microsoft-DS

And

netbios-ssn     139/tcp    NETBIOS Session Service
netbios-ssn     139/udp    NETBIOS Session Service

It's a Microsoft one.
Do you know if there's Samba running newhere? Or are both boxes running something windows?

Jeff Johnson wrote:

> Hello. My ignorance will be vivid here....
>
> I'm currently doing marketing at a small office, but, as I'm technically
> inclined enough to be dangerous, in my spare time do the IS support as well.
> They had an outside consultant set up the system, and he had done other
> setups/management when needed, but, is no longer available.  He'd set up the
> network with a Symantec VPN/Firewall appliance as the external gateway,  but
> had opened up ports to a server inside the network which is currently
> hosting the email server (Xmail), DNS, as well as a simple web app to do
> web-mail checking for employees from the outside.  Also opened ports for
> ssl, termserver, ftp, smtp, and pop3, and another port for remote admin.
>
> Looked a bit insecure for me when I noticed it, so, I installed ZoneAlarm on
> this server inside the network, which is currently working.  Plans are to
> move the web serving onto another server which will be put into a DMZ. After
> noticing these open ports, I also decided to pay more attention to the
> firewall logs, and noticed not just the normal external port scan attack
> blocks, but also that a couple of computers, including the company server,
> are attempting to access outside IPs using closed port calls (therefore, the
> firewall catches and logs them).  These blocks come with the message Block
> host "" internet access, and are typically using ports  139 & 445.  Looked
> suspicious, so, I ran an fport scan on the server, and it did show ports 139
> & 445 open, but, shows that the Pid is 8 (the system).....Also did some
> ethereal scan of the network, and it does show that the server is trying to
> access this specific external ip address.
>
> My question is (kudos if you've patiently read everything so far), how do I
> find out what this process is that is trying to do these accesses, or am I
> being overly paranoid.  

I don't think you're being overly paranoid. There might be some box trying to share something with external IP's, and you don't 
want that, do you?

I do find it strange that _your_ network tries to reach an external host. Usually, it's vice versa :)
Perhaps an employee who want to access his files at home? But he woulnd't have server access ...

Main thing: Search for anything SMB. In Windows that is the Network Neighbourhood, in *nix it'd be the smbclient.

Hope this helps in any way,

 - wuck

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