Penetration Testing mailing list archives
RE: Exhange 2003
From: "Blurred Vision" <really_blurred_vision () hotmail com>
Date: Mon, 08 Mar 2004 17:59:52 +1100
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 --------------------------------------------------------------------------- Free 30-day trial: firewall with virus/spam protection, URL filtering, VPN, wireless securityProtect your network against hackers, viruses, spam and other risks with Astaro
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Current thread:
- Exhange 2003 Deniz CEVIK (Mar 02)
- Re: Exhange 2003 jamesworld (Mar 03)
- RE: Exhange 2003 Deniz CEVIK (Mar 03)
- RE: Exhange 2003 John Swope (Mar 04)
- RE: Exhange 2003 joey (Mar 05)
- Re[2]: Exhange 2003 Marius Huse Jacobsen (Mar 15)
- RE: Exhange 2003 Deniz CEVIK (Mar 03)
- Re: Exhange 2003 jamesworld (Mar 03)
- <Possible follow-ups>
- RE: Exhange 2003 Meidinger Chris (Mar 03)
- RE: Exhange 2003 Zach Forsyth (Mar 05)
- RE: Exhange 2003 Bowden, Sean (Mar 07)
- RE: Exhange 2003 Blurred Vision (Mar 08)