From: Blurred Vision (really_blurred_vision@hotmail.com)
Date: Mon Mar 08 2004 - 01:59:52 EST
This is standard for Exchange. When you connect to it, it will talk to port
139 on your system. Exchange tries to log your friendly windows hostname in
the system logs. This in turn populates the netbios table on your system
with it's info, hence the nbtstat response (coming from your cache). if you
want to test this, perform these steps:
Look at the cached netbios table to show it's empty (you may need to purge
it...)
c:\> nbtstat -c
telnet to the remote mail server:
c:\>telnet exchange.mycompany.com 25
then look at the cached netbios table again:
c:\> nbtstat -c
TCPDUMP it, and you will see the traffic.
Worth mentioning in thepentest report as an information leak.
hope this helps.
Blurr.
-----Original Message-----
From: Deniz CEVIK [mailto:deniz@edizayn.com.tr]
Sent: Wednesday, 3 March 2004 1:30 AM
To: pen-test@securityfocus.com
Subject: Exhange 2003
Hi All,
While we are testing our customer network, we faced with strange problem. We
are testing exchange 2003 server externally. When we controlled open
services with port scan, I saw that only two ports (25 and 100) are shown as
open. Before I run the portscan, I have controlled the server with "nbtstat"
command of windows. It returned error messages as below.
nbtstat -A EXCH_IP
Local Area Connection:
Node IpAddress: [MY_MACHINE] Scope Id: []
Host not found.
After the port scan is finished, in order to see the banner information of
mail server, I opened the connection to port 25 using telnet command (telnet
EXCH_IP 25). Same time when I run "nbtstat -A" command from another window
by mistake and I saw that below output.
nbtstat -A EXCH_IP
Local Area Connection:
Node IpAddress: [MY_MACHINE] Scope Id: []
NetBIOS Remote Machine Name Table
Name Type Status
---------------------------------------------
HADXM <1F> UNIQUE Registered
HADXM <00> UNIQUE Registered
HADXM <20> UNIQUE Registered
EXCHANGE <00> GROUP Registered
EXCHANGE <1C> GROUP Registered
EXCHANGE <1B> UNIQUE Registered
EXCHANGE <1E> GROUP Registered
HADXM <03> UNIQUE Registered
ADMINISTRATOR <03> UNIQUE Registered
EXCHANGE <1D> UNIQUE Registered
..__MSBROWSE__. <01> GROUP Registered
HADXM <6A> UNIQUE Registered
HADXM <87> UNIQUE Registered
MAC Address = MAC_ADDRESS_OF_EXCHANGE
If there isn't any connection to open port of the server you can't see this
nbtstat outputs.
Has any body faced with same situations before?
BR
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